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6 years agonfp: flower: move route ack control messages out of the workqueue
Pieter Jansen van Vuuren [Wed, 11 Apr 2018 23:47:37 +0000 (16:47 -0700)]
nfp: flower: move route ack control messages out of the workqueue

Previously we processed the route ack control messages in the workqueue,
this unnecessarily loads the workqueue. We can deal with these messages
sooner as we know we are going to drop them.

Fixes: 8e6a9046b66a ("nfp: flower vxlan neighbour offload")
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agonfp: print a message when mutex wait is interrupted
Jakub Kicinski [Wed, 11 Apr 2018 23:47:36 +0000 (16:47 -0700)]
nfp: print a message when mutex wait is interrupted

When waiting for an NFP mutex is interrupted print a message
to make root causing later error messages easier.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agonfp: ignore signals when communicating with management FW
Jakub Kicinski [Wed, 11 Apr 2018 23:47:35 +0000 (16:47 -0700)]
nfp: ignore signals when communicating with management FW

We currently allow signals to interrupt the wait for management FW
commands.  Exiting the wait should not cause trouble, the FW will
just finish executing the command in the background and new commands
will wait for the old one to finish.

However, this may not be what users expect (Ctrl-C not actually stopping
the command).  Moreover some systems routinely request link information
with signals pending (Ubuntu 14.04 runs a landscape-sysinfo python tool
from MOTD) worrying users with errors like these:

nfp 0000:04:00.0: nfp_nsp: Error -512 waiting for code 0x0007 to start
nfp 0000:04:00.0: nfp: reading port table failed -512

Make the wait for management FW responses non-interruptible.

Fixes: 1a64821c6af7 ("nfp: add support for service processor access")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agotipc: fix missing initializer in tipc_sendmsg()
Jon Maloy [Wed, 11 Apr 2018 23:15:48 +0000 (01:15 +0200)]
tipc: fix missing initializer in tipc_sendmsg()

The stack variable 'dnode' in __tipc_sendmsg() may theoretically
end up tipc_node_get_mtu() as an unitilalized variable.

We fix this by intializing the variable at declaration. We also add
a default else clause to the two conditional ones already there, so
that we never end up in the named function if the given address
type is illegal.

Reported-by: syzbot+b0975ce9355b347c1546@syzkaller.appspotmail.com
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agostrparser: Fix incorrect strp->need_bytes value.
Doron Roberts-Kedes [Wed, 11 Apr 2018 22:05:16 +0000 (15:05 -0700)]
strparser: Fix incorrect strp->need_bytes value.

strp_data_ready resets strp->need_bytes to 0 if strp_peek_len indicates
that the remainder of the message has been received. However,
do_strp_work does not reset strp->need_bytes to 0. If do_strp_work
completes a partial message, the value of strp->need_bytes will continue
to reflect the needed bytes of the previous message, causing
future invocations of strp_data_ready to return early if
strp->need_bytes is less than strp_peek_len. Resetting strp->need_bytes
to 0 in __strp_recv on handing a full message to the upper layer solves
this problem.

__strp_recv also calculates strp->need_bytes using stm->accum_len before
stm->accum_len has been incremented by cand_len. This can cause
strp->need_bytes to be equal to the full length of the message instead
of the full length minus the accumulated length. This, in turn, causes
strp_data_ready to return early, even when there is sufficient data to
complete the partial message. Incrementing stm->accum_len before using
it to calculate strp->need_bytes solves this problem.

Found while testing net/tls_sw recv path.

Fixes: 43a0c6751a322847 ("strparser: Stream parser for messages")
Signed-off-by: Doron Roberts-Kedes <doronrk@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agoselftests: net: add in_netns.sh to TEST_PROGS
Anders Roxell [Wed, 11 Apr 2018 15:17:34 +0000 (17:17 +0200)]
selftests: net: add in_netns.sh to TEST_PROGS

Script in_netns.sh isn't installed.
--------------------
running psock_fanout test
--------------------
./run_afpackettests: line 12: ./in_netns.sh: No such file or directory
[FAIL]
--------------------
running psock_tpacket test
--------------------
./run_afpackettests: line 22: ./in_netns.sh: No such file or directory
[FAIL]

In current code added in_netns.sh to be installed.

Fixes: cc30c93fa020 ("selftests/net: ignore background traffic in psock_fanout")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agoMerge branch 'ibmvnic-Fix-parameter-change-request-handling'
David S. Miller [Fri, 13 Apr 2018 01:51:54 +0000 (21:51 -0400)]
Merge branch 'ibmvnic-Fix-parameter-change-request-handling'

Nathan Fontenot says:

====================
ibmvnic: Fix parameter change request handling

When updating parameters for the ibmvnic driver there is a possibility
of entering an infinite loop if a return value other that a partial
success is received from sending the login CRQ.

Also, a deadlock can occur on the rtnl lock if netdev_notify_peers()
is called during driver reset for a parameter change reset.

This patch set corrects both of these issues by updating the return
code handling in ibmvnic_login() nand gaurding against calling
netdev_notify_peers() for parameter change requests.

Updates for V2: Correct spelling mistakes in commit messages.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agoibmvnic: Do not notify peers on parameter change resets
Nathan Fontenot [Wed, 11 Apr 2018 15:09:38 +0000 (10:09 -0500)]
ibmvnic: Do not notify peers on parameter change resets

When attempting to change the driver parameters, such as the MTU
value or number of queues, do not call netdev_notify_peers().
Doing so will deadlock on the rtnl_lock.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agoibmvnic: Handle all login error conditions
Nathan Fontenot [Wed, 11 Apr 2018 15:09:32 +0000 (10:09 -0500)]
ibmvnic: Handle all login error conditions

There is a bug in handling the possible return codes from sending the
login CRQ. The current code treats any non-success return value,
minus failure to send the crq and a timeout waiting for a login response,
as a need to re-send the login CRQ. This can put the drive in an
infinite loop of trying to login when getting return values other
that a partial success such as a return code of aborted. For these
scenarios the login will not ever succeed at this point and the
driver would need to be reset again.

To resolve this loop trying to login is updated to only retry the
login if the driver gets a return code of a partial success. Other
return codes are treated as an error and the driver returns an error
from ibmvnic_login().

To avoid infinite looping in the partial success return cases, the
number of retries is capped at the maximum number of supported
queues. This value was chosen because the driver does a renegotiation
of capabilities which sets the number of queues possible and allows
the driver to attempt a login for possible value for the number
of queues supported.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agonet: validate attribute sizes in neigh_dump_table()
Eric Dumazet [Wed, 11 Apr 2018 21:46:00 +0000 (14:46 -0700)]
net: validate attribute sizes in neigh_dump_table()

Since neigh_dump_table() calls nlmsg_parse() without giving policy
constraints, attributes can have arbirary size that we must validate

Reported by syzbot/KMSAN :

BUG: KMSAN: uninit-value in neigh_master_filtered net/core/neighbour.c:2292 [inline]
BUG: KMSAN: uninit-value in neigh_dump_table net/core/neighbour.c:2348 [inline]
BUG: KMSAN: uninit-value in neigh_dump_info+0x1af0/0x2250 net/core/neighbour.c:2438
CPU: 1 PID: 3575 Comm: syzkaller268891 Not tainted 4.16.0+ #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 neigh_master_filtered net/core/neighbour.c:2292 [inline]
 neigh_dump_table net/core/neighbour.c:2348 [inline]
 neigh_dump_info+0x1af0/0x2250 net/core/neighbour.c:2438
 netlink_dump+0x9ad/0x1540 net/netlink/af_netlink.c:2225
 __netlink_dump_start+0x1167/0x12a0 net/netlink/af_netlink.c:2322
 netlink_dump_start include/linux/netlink.h:214 [inline]
 rtnetlink_rcv_msg+0x1435/0x1560 net/core/rtnetlink.c:4598
 netlink_rcv_skb+0x355/0x5f0 net/netlink/af_netlink.c:2447
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4653
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x1672/0x1750 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x1048/0x1310 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
 __sys_sendmsg net/socket.c:2080 [inline]
 SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
 SyS_sendmsg+0x54/0x80 net/socket.c:2087
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x43fed9
RSP: 002b:00007ffddbee2798 EFLAGS: 00000213 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fed9
RDX: 0000000000000000 RSI: 0000000020005000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401800
R13: 0000000000401890 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slub.c:2737 [inline]
 __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:984 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1183 [inline]
 netlink_sendmsg+0x9a6/0x1310 net/netlink/af_netlink.c:1875
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
 __sys_sendmsg net/socket.c:2080 [inline]
 SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
 SyS_sendmsg+0x54/0x80 net/socket.c:2087
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2

Fixes: 21fdd092acc7 ("net: Add support for filtering neigh dump by master device")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: David Ahern <dsa@cumulusnetworks.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agotcp: md5: reject TCP_MD5SIG or TCP_MD5SIG_EXT on established sockets
Eric Dumazet [Wed, 11 Apr 2018 21:36:28 +0000 (14:36 -0700)]
tcp: md5: reject TCP_MD5SIG or TCP_MD5SIG_EXT on established sockets

syzbot/KMSAN reported an uninit-value in tcp_parse_options() [1]

I believe this was caused by a TCP_MD5SIG being set on live
flow.

This is highly unexpected, since TCP option space is limited.

For instance, presence of TCP MD5 option automatically disables
TCP TimeStamp option at SYN/SYNACK time, which we can not do
once flow has been established.

Really, adding/deleting an MD5 key only makes sense on sockets
in CLOSE or LISTEN state.

[1]
BUG: KMSAN: uninit-value in tcp_parse_options+0xd74/0x1a30 net/ipv4/tcp_input.c:3720
CPU: 1 PID: 6177 Comm: syzkaller192004 Not tainted 4.16.0+ #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 tcp_parse_options+0xd74/0x1a30 net/ipv4/tcp_input.c:3720
 tcp_fast_parse_options net/ipv4/tcp_input.c:3858 [inline]
 tcp_validate_incoming+0x4f1/0x2790 net/ipv4/tcp_input.c:5184
 tcp_rcv_established+0xf60/0x2bb0 net/ipv4/tcp_input.c:5453
 tcp_v4_do_rcv+0x6cd/0xd90 net/ipv4/tcp_ipv4.c:1469
 sk_backlog_rcv include/net/sock.h:908 [inline]
 __release_sock+0x2d6/0x680 net/core/sock.c:2271
 release_sock+0x97/0x2a0 net/core/sock.c:2786
 tcp_sendmsg+0xd6/0x100 net/ipv4/tcp.c:1464
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x448fe9
RSP: 002b:00007fd472c64d38 EFLAGS: 00000216 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000006e5a30 RCX: 0000000000448fe9
RDX: 000000000000029f RSI: 0000000020a88f88 RDI: 0000000000000004
RBP: 00000000006e5a34 R08: 0000000020e68000 R09: 0000000000000010
R10: 00000000200007fd R11: 0000000000000216 R12: 0000000000000000
R13: 00007fff074899ef R14: 00007fd472c659c0 R15: 0000000000000009

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
 kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc_node mm/slub.c:2737 [inline]
 __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:984 [inline]
 tcp_send_ack+0x18c/0x910 net/ipv4/tcp_output.c:3624
 __tcp_ack_snd_check net/ipv4/tcp_input.c:5040 [inline]
 tcp_ack_snd_check net/ipv4/tcp_input.c:5053 [inline]
 tcp_rcv_established+0x2103/0x2bb0 net/ipv4/tcp_input.c:5469
 tcp_v4_do_rcv+0x6cd/0xd90 net/ipv4/tcp_ipv4.c:1469
 sk_backlog_rcv include/net/sock.h:908 [inline]
 __release_sock+0x2d6/0x680 net/core/sock.c:2271
 release_sock+0x97/0x2a0 net/core/sock.c:2786
 tcp_sendmsg+0xd6/0x100 net/ipv4/tcp.c:1464
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 SYSC_sendto+0x6c3/0x7e0 net/socket.c:1747
 SyS_sendto+0x8a/0xb0 net/socket.c:1715
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2

Fixes: cfb6eeb4c860 ("[TCP]: MD5 Signature Option (RFC2385) support.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agotipc: fix unbalanced reference counter
Jon Maloy [Wed, 11 Apr 2018 20:52:09 +0000 (22:52 +0200)]
tipc: fix unbalanced reference counter

When a topology subscription is created, we may encounter (or KASAN
may provoke) a failure to create a corresponding service instance in
the binding table. Instead of letting the tipc_nametbl_subscribe()
report the failure back to the caller, the function just makes a warning
printout and returns, without incrementing the subscription reference
counter as expected by the caller.

This makes the caller believe that the subscription was successful, so
it will at a later moment try to unsubscribe the item. This involves
a sub_put() call. Since the reference counter never was incremented
in the first place, we get a premature delete of the subscription item,
followed by a "use-after-free" warning.

We fix this by adding a return value to tipc_nametbl_subscribe() and
make the caller aware of the failure to subscribe.

This bug seems to always have been around, but this fix only applies
back to the commit shown below. Given the low risk of this happening
we believe this to be sufficient.

Fixes: commit 218527fe27ad ("tipc: replace name table service range
array with rb tree")
Reported-by: syzbot+aa245f26d42b8305d157@syzkaller.appspotmail.com
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agolan78xx: PHY DSP registers initialization to address EEE link drop issues with long...
Raghuram Chary J [Wed, 11 Apr 2018 15:06:36 +0000 (20:36 +0530)]
lan78xx: PHY DSP registers initialization to address EEE link drop issues with long cables

The patch is to configure DSP registers of PHY device
to handle Gbe-EEE failures with >40m cable length.

Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Raghuram Chary J <raghuramchary.jallipalli@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agomISDN: Remove VLAs
Laura Abbott [Wed, 11 Apr 2018 01:04:29 +0000 (18:04 -0700)]
mISDN: Remove VLAs

There's an ongoing effort to remove VLAs[1] from the kernel to eventually
turn on -Wvla. Remove the VLAs from the mISDN code by switching to using
kstrdup in one place and using an upper bound in another.

Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agonet/tls: Remove VLA usage
Kees Cook [Wed, 11 Apr 2018 00:52:34 +0000 (17:52 -0700)]
net/tls: Remove VLA usage

In the quest to remove VLAs from the kernel[1], this replaces the VLA
size with the only possible size used in the code, and adds a mechanism
to double-check future IV sizes.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Dave Watson <davejwatson@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agoibmvnic: Define vnic_login_client_data name field as unsized array
Kees Cook [Tue, 10 Apr 2018 22:26:43 +0000 (15:26 -0700)]
ibmvnic: Define vnic_login_client_data name field as unsized array

The "name" field of struct vnic_login_client_data is a char array of
undefined length. This should be written as "char name[]" so the compiler
can make better decisions about the field (for example, not assuming
it's a single character). This was noticed while trying to tighten the
CONFIG_FORTIFY_SOURCE checking.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Thu, 12 Apr 2018 18:09:05 +0000 (11:09 -0700)]
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) In ip_gre tunnel, handle the conflict between TUNNEL_{SEQ,CSUM} and
    GSO/LLTX properly. From Sabrina Dubroca.

 2) Stop properly on error in lan78xx_read_otp(), from Phil Elwell.

 3) Don't uncompress in slip before rstate is initialized, from Tejaswi
    Tanikella.

 4) When using 1.x firmware on aquantia, issue a deinit before we
    hardware reset the chip, otherwise we break dirty wake WOL. From
    Igor Russkikh.

 5) Correct log check in vhost_vq_access_ok(), from Stefan Hajnoczi.

 6) Fix ethtool -x crashes in bnxt_en, from Michael Chan.

 7) Fix races in l2tp tunnel creation and duplicate tunnel detection,
    from Guillaume Nault.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (22 commits)
  l2tp: fix race in duplicate tunnel detection
  l2tp: fix races in tunnel creation
  tun: send netlink notification when the device is modified
  tun: set the flags before registering the netdevice
  lan78xx: Don't reset the interface on open
  bnxt_en: Fix NULL pointer dereference at bnxt_free_irq().
  bnxt_en: Need to include RDMA rings in bnxt_check_rings().
  bnxt_en: Support max-mtu with VF-reps
  bnxt_en: Ignore src port field in decap filter nodes
  bnxt_en: do not allow wildcard matches for L2 flows
  bnxt_en: Fix ethtool -x crash when device is down.
  vhost: return bool from *_access_ok() functions
  vhost: fix vhost_vq_access_ok() log check
  vhost: Fix vhost_copy_to_user()
  net: aquantia: oops when shutdown on already stopped device
  net: aquantia: Regression on reset with 1.x firmware
  cdc_ether: flag the Cinterion AHS8 modem by gemalto as WWAN
  slip: Check if rstate is initialized before uncompressing
  lan78xx: Avoid spurious kevent 4 "error"
  lan78xx: Correctly indicate invalid OTP
  ...

6 years agoMerge tag 'for-linus-4.17-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Thu, 12 Apr 2018 18:04:35 +0000 (11:04 -0700)]
Merge tag 'for-linus-4.17-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:
 "A few fixes of Xen related core code and drivers"

* tag 'for-linus-4.17-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen
  xen/acpi: off by one in read_acpi_id()
  xen/acpi: upload _PSD info for non Dom0 CPUs too
  x86/xen: Delay get_cpu_cap until stack canary is established
  xen: xenbus_dev_frontend: Verify body of XS_TRANSACTION_END
  xen: xenbus: Catch closing of non existent transactions
  xen: xenbus_dev_frontend: Fix XS_TRANSACTION_END handling

6 years agoMerge tag 'dma-mapping-4.17-2' of git://git.infradead.org/users/hch/dma-mapping
Linus Torvalds [Thu, 12 Apr 2018 18:00:48 +0000 (11:00 -0700)]
Merge tag 'dma-mapping-4.17-2' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fix from Christoph Hellwig:
 "Fix for one swiotlb regression in 2.16 from Takashi"

* tag 'dma-mapping-4.17-2' of git://git.infradead.org/users/hch/dma-mapping:
  swiotlb: fix unexpected swiotlb_alloc_coherent failures

6 years agoMerge tag 'mmc-v4.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Linus Torvalds [Thu, 12 Apr 2018 17:59:03 +0000 (10:59 -0700)]
Merge tag 'mmc-v4.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

Pull MMC fixes from Ulf Hansson:
 "MMC core:
   - Prevent bus reference leak in mmc_blk_init()

  MMC host:
   - tmio: Fix error handling when issuing CMD23
   - jz4740: Fix race condition in IRQ mask update"

* tag 'mmc-v4.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: tmio: Fix error handling when issuing CMD23
  mmc: core: Prevent bus reference leak in mmc_blk_init()
  mmc: jz4740: Fix race condition in IRQ mask update

6 years agoMerge tag 'for_linus-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel...
Linus Torvalds [Thu, 12 Apr 2018 17:21:19 +0000 (10:21 -0700)]
Merge tag 'for_linus-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb

Pull kdb updates from Jason Wessel:

 - fix 2032 time access issues and new compiler warnings

 - minor regression test cleanup

 - formatting fixes for end user use of kdb

* tag 'for_linus-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb:
  kdb: use memmove instead of overlapping memcpy
  kdb: use ktime_get_mono_fast_ns() instead of ktime_get_ts()
  kdb: bl: don't use tab character in output
  kdb: drop newline in unknown command output
  kdb: make "mdr" command repeat
  kdb: use __ktime_get_real_seconds instead of __current_kernel_time
  misc: kgdbts: Display progress of asynchronous tests

6 years agoMerge tag 'microblaze-4.17-rc1' of git://git.monstr.eu/linux-2.6-microblaze
Linus Torvalds [Thu, 12 Apr 2018 17:18:02 +0000 (10:18 -0700)]
Merge tag 'microblaze-4.17-rc1' of git://git.monstr.eu/linux-2.6-microblaze

Pull microblaze updates from Michal Simek:
 "Use generic pci_mmap_resource_range()"

* tag 'microblaze-4.17-rc1' of git://git.monstr.eu/linux-2.6-microblaze:
  microblaze: Use generic pci_mmap_resource_range()
  microblaze: Provide pgprot_device/writecombine macros for nommu

6 years agoMerge tag 'asm-generic' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm...
Linus Torvalds [Thu, 12 Apr 2018 16:15:48 +0000 (09:15 -0700)]
Merge tag 'asm-generic' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pull asm-generic fixes from Arnd Bergmann:
 "I have one regression fix for a minor build problem after the
  architecture removal series, plus a rework of the barriers in the
  readl/writel functions, thanks to work by Sinan Kaya:

  This started from a discussion on the linuxpcc and rdma mailing
  lists[1]. To summarize, we decided that architectures are responsible
  to serialize readl() and writel() accesses on a device MMIO space
  relative to DMA performed by that device.

  This series provides a pessimistic implementation of that behavior for
  asm-generic/io.h, which is in turn used by a number of architectures
  (h8300, microblaze, nios2, openrisc, s390, sparc, um, unicore32, and
  xtensa). Some of those presumably need no extra barriers, or something
  weaker than rmb()/wmb(), and they are advised to override the new
  default for better performance.

  For inb()/outb(), the same barriers are used, but architectures might
  want to add another barrier to outb() here if that can guarantee
  non-posted behavior (some architectures can, others cannot do that).

  The readl_relaxed()/writel_relaxed() family of functions retains the
  existing behavior with no extra barriers"

[1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-March/170481.html

* tag 'asm-generic' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
  io: change writeX_relaxed() to remove barriers
  io: change readX_relaxed() to remove barriers
  dts: remove cris & metag dts hard link file
  io: change inX() to have their own IO barrier overrides
  io: change outX() to have their own IO barrier overrides
  io: define stronger ordering for the default writeX() implementation
  io: define stronger ordering for the default readX() implementation
  io: define several IO & PIO barrier types for the asm-generic version

6 years agoMerge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
Linus Torvalds [Thu, 12 Apr 2018 01:58:27 +0000 (18:58 -0700)]
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio update from Michael Tsirkin:
 "This adds reporting hugepage stats to virtio-balloon"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio_balloon: export hugetlb page allocation counts

6 years agoMerge tag 'iommu-updates-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Thu, 12 Apr 2018 01:50:41 +0000 (18:50 -0700)]
Merge tag 'iommu-updates-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU updates from Joerg Roedel:

 - OF_IOMMU support for the Rockchip iommu driver so that it can use
   generic DT bindings

 - rework of locking in the AMD IOMMU interrupt remapping code to make
   it work better in RT kernels

 - support for improved iotlb flushing in the AMD IOMMU driver

 - support for 52-bit physical and virtual addressing in the ARM-SMMU

 - various other small fixes and cleanups

* tag 'iommu-updates-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (53 commits)
  iommu/io-pgtable-arm: Avoid warning with 32-bit phys_addr_t
  iommu/rockchip: Support sharing IOMMU between masters
  iommu/rockchip: Add runtime PM support
  iommu/rockchip: Fix error handling in init
  iommu/rockchip: Use OF_IOMMU to attach devices automatically
  iommu/rockchip: Use IOMMU device for dma mapping operations
  dt-bindings: iommu/rockchip: Add clock property
  iommu/rockchip: Control clocks needed to access the IOMMU
  iommu/rockchip: Fix TLB flush of secondary IOMMUs
  iommu/rockchip: Use iopoll helpers to wait for hardware
  iommu/rockchip: Fix error handling in attach
  iommu/rockchip: Request irqs in rk_iommu_probe()
  iommu/rockchip: Fix error handling in probe
  iommu/rockchip: Prohibit unbind and remove
  iommu/amd: Return proper error code in irq_remapping_alloc()
  iommu/amd: Make amd_iommu_devtable_lock a spin_lock
  iommu/amd: Drop the lock while allocating new irq remap table
  iommu/amd: Factor out setting the remap table for a devid
  iommu/amd: Use `table' instead `irt' as variable name in amd_iommu_update_ga()
  iommu/amd: Remove the special case from alloc_irq_table()
  ...

6 years agoMerge tag 'pm-4.17-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Thu, 12 Apr 2018 00:03:20 +0000 (17:03 -0700)]
Merge tag 'pm-4.17-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more power management updates from Rafael Wysocki:
 "These include one big-ticket item which is the rework of the idle loop
  in order to prevent CPUs from spending too much time in shallow idle
  states. It reduces idle power on some systems by 10% or more and may
  improve performance of workloads in which the idle loop overhead
  matters. This has been in the works for several weeks and it has been
  tested and reviewed quite thoroughly.

  Also included are changes that finalize the cpufreq cleanup moving
  frequency table validation from drivers to the core, a few fixes and
  cleanups of cpufreq drivers, a cpuidle documentation update and a PM
  QoS core update to mark the expected switch fall-throughs in it.

  Specifics:

   - Rework the idle loop in order to prevent CPUs from spending too
     much time in shallow idle states by making it stop the scheduler
     tick before putting the CPU into an idle state only if the idle
     duration predicted by the idle governor is long enough.

     That required the code to be reordered to invoke the idle governor
     before stopping the tick, among other things (Rafael Wysocki,
     Frederic Weisbecker, Arnd Bergmann).

   - Add the missing description of the residency sysfs attribute to the
     cpuidle documentation (Prashanth Prakash).

   - Finalize the cpufreq cleanup moving frequency table validation from
     drivers to the core (Viresh Kumar).

   - Fix a clock leak regression in the armada-37xx cpufreq driver
     (Gregory Clement).

   - Fix the initialization of the CPU performance data structures for
     shared policies in the CPPC cpufreq driver (Shunyong Yang).

   - Clean up the ti-cpufreq, intel_pstate and CPPC cpufreq drivers a
     bit (Viresh Kumar, Rafael Wysocki).

   - Mark the expected switch fall-throughs in the PM QoS core (Gustavo
     Silva)"

* tag 'pm-4.17-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (23 commits)
  tick-sched: avoid a maybe-uninitialized warning
  cpufreq: Drop cpufreq_table_validate_and_show()
  cpufreq: SCMI: Don't validate the frequency table twice
  cpufreq: CPPC: Initialize shared perf capabilities of CPUs
  cpufreq: armada-37xx: Fix clock leak
  cpufreq: CPPC: Don't set transition_latency
  cpufreq: ti-cpufreq: Use builtin_platform_driver()
  cpufreq: intel_pstate: Do not include debugfs.h
  PM / QoS: mark expected switch fall-throughs
  cpuidle: Add definition of residency to sysfs documentation
  time: hrtimer: Use timerqueue_iterate_next() to get to the next timer
  nohz: Avoid duplication of code related to got_idle_tick
  nohz: Gather tick_sched booleans under a common flag field
  cpuidle: menu: Avoid selecting shallow states with stopped tick
  cpuidle: menu: Refine idle state selection for running tick
  sched: idle: Select idle state before stopping the tick
  time: hrtimer: Introduce hrtimer_next_event_without()
  time: tick-sched: Split tick_nohz_stop_sched_tick()
  cpuidle: Return nohz hint from cpuidle_select()
  jiffies: Introduce USER_TICK_USEC and redefine TICK_USEC
  ...

6 years agoMerge tag 'ktest-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
Linus Torvalds [Wed, 11 Apr 2018 23:42:27 +0000 (16:42 -0700)]
Merge tag 'ktest-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-ktest

Pull ktest updates from Steven Rostedt:
 "These commits have either been sitting in my INBOX or have been in my
  local tree for some time. I need to push them upstream:

   - Separate out config-bisect.pl from ktest.pl.

     This allows users to do config bisects without full ktest setup.

   - Email on status change.

     Allow the user to be emailed on test start, finish, failure, etc.

   - Other small fixes and enhancements"

* tag 'ktest-v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-ktest: (24 commits)
  ktest: Take submenu into account for grub2 menus
  ktest.pl: Add MAIL_COMMAND option to define how to send email
  ktest.pl: Use run_command to execute sending mail
  ktest.pl: Allow dodie be recursive
  ktest.pl: Kill test if mailer is not supported
  ktest.pl: Add MAIL_PATH option to define where to find the mailer
  ktest.pl: No need to print no mailer is specified when mailto is not
  Ktest: add email options to sample.config
  Ktest: Use dodie for critical falures
  Ktest: Add SigInt handling
  Ktest: Add email support
  ktest.pl: Detect if a config-bisect was interrupted
  ktest.pl: Make finding config-bisect.pl dynamic
  ktest.pl: Have ktest.pl pass -r to config-bisect.pl to reset bisect
  ktest.pl: Use diffconfig if available for failed config bisects
  ktest.pl: Allow for the config-bisect.pl output to display to console
  ktest: Use config-bisect.pl in ktest.pl
  ktest: Add standalone config-bisect.pl program
  ktest: Set do_not_reboot=y for CONFIG_BISECT_TYPE=build
  ktest: Set buildonly=1 for CONFIG_BISECT_TYPE=build
  ...

6 years agoMerge tag 'tags/upstream-4.17-rc1' of git://git.infradead.org/linux-ubifs
Linus Torvalds [Wed, 11 Apr 2018 23:39:34 +0000 (16:39 -0700)]
Merge tag 'tags/upstream-4.17-rc1' of git://git.infradead.org/linux-ubifs

Pull UBI and UBIFS updates from Richard Weinberger:
 "Minor bug fixes and improvements"

* tag 'tags/upstream-4.17-rc1' of git://git.infradead.org/linux-ubifs:
  ubi: Reject MLC NAND
  ubifs: Remove useless parameter of lpt_heap_replace
  ubifs: Constify struct ubifs_lprops in scan_for_leb_for_idx
  ubifs: remove unnecessary assignment
  ubi: Fix error for write access
  ubi: fastmap: Don't flush fastmap work on detach
  ubifs: Check ubifs_wbuf_sync() return code

6 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml
Linus Torvalds [Wed, 11 Apr 2018 23:36:47 +0000 (16:36 -0700)]
Merge git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

Pull UML updates from Richard Weinberger:

 - a new and faster epoll based IRQ controller and NIC driver

 - misc fixes and janitorial updates

* git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  Fix vector raw inintialization logic
  Migrate vector timers to new timer API
  um: Compile with modern headers
  um: vector: Fix an error handling path in 'vector_parse()'
  um: vector: Fix a memory allocation check
  um: vector: fix missing unlock on error in vector_net_open()
  um: Add missing EXPORT for free_irq_by_fd()
  High Performance UML Vector Network Driver
  Epoll based IRQ controller
  um: Use POSIX ucontext_t instead of struct ucontext
  um: time: Use timespec64 for persistent clock
  um: Restore symbol versions for __memcpy and memcpy

6 years agoMerge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Linus Torvalds [Wed, 11 Apr 2018 23:12:21 +0000 (16:12 -0700)]
Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC fixes from Arnd Bergmann:
 "Here is a very small set of fixes for inclusion in linux-4.17-rc1: Two
  changes for the maintainer file, and one more fix for the newly added
  npcm platform, to enable the level 2 cache controller"

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  MAINTAINERS: Update ASPEED entry with details
  MAINTAINERS: Migrate oxnas list to groups.io
  arm: npcm: enable L2 cache in NPCM7xx architecture

6 years agoMerge tag 'nios2-v4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan...
Linus Torvalds [Wed, 11 Apr 2018 23:02:18 +0000 (16:02 -0700)]
Merge tag 'nios2-v4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan/nios2

Pull nios2 update from Ley Foon Tan:
 "Use read_persistent_clock64() instead of read_persistent_clock()"

* tag 'nios2-v4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/lftan/nios2:
  nios2: Use read_persistent_clock64() instead of read_persistent_clock()

6 years agoMerge branch 'l2tp-tunnel-creation-fixes'
David S. Miller [Wed, 11 Apr 2018 21:41:28 +0000 (17:41 -0400)]
Merge branch 'l2tp-tunnel-creation-fixes'

Guillaume Nault says:

====================
l2tp: tunnel creation fixes

L2TP tunnel creation is racy. We need to make sure that the tunnel
returned by l2tp_tunnel_create() isn't going to be freed while the
caller is using it. This is done in patch #1, by separating tunnel
creation from tunnel registration.

With the tunnel registration code in place, we can now check for
duplicate tunnels in a race-free way. This is done in patch #2, which
incidentally removes the last use of l2tp_tunnel_find().
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agol2tp: fix race in duplicate tunnel detection
Guillaume Nault [Tue, 10 Apr 2018 19:01:13 +0000 (21:01 +0200)]
l2tp: fix race in duplicate tunnel detection

We can't use l2tp_tunnel_find() to prevent l2tp_nl_cmd_tunnel_create()
from creating a duplicate tunnel. A tunnel can be concurrently
registered after l2tp_tunnel_find() returns. Therefore, searching for
duplicates must be done at registration time.

Finally, remove l2tp_tunnel_find() entirely as it isn't use anywhere
anymore.

Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agol2tp: fix races in tunnel creation
Guillaume Nault [Tue, 10 Apr 2018 19:01:12 +0000 (21:01 +0200)]
l2tp: fix races in tunnel creation

l2tp_tunnel_create() inserts the new tunnel into the namespace's tunnel
list and sets the socket's ->sk_user_data field, before returning it to
the caller. Therefore, there are two ways the tunnel can be accessed
and freed, before the caller even had the opportunity to take a
reference. In practice, syzbot could crash the module by closing the
socket right after a new tunnel was returned to pppol2tp_create().

This patch moves tunnel registration out of l2tp_tunnel_create(), so
that the caller can safely hold a reference before publishing the
tunnel. This second step is done with the new l2tp_tunnel_register()
function, which is now responsible for associating the tunnel to its
socket and for inserting it into the namespace's list.

While moving the code to l2tp_tunnel_register(), a few modifications
have been done. First, the socket validation tests are done in a helper
function, for clarity. Also, modifying the socket is now done after
having inserted the tunnel to the namespace's tunnels list. This will
allow insertion to fail, without having to revert theses modifications
in the error path (a followup patch will check for duplicate tunnels
before insertion). Either the socket is a kernel socket which we
control, or it is a user-space socket for which we have a reference on
the file descriptor. In any case, the socket isn't going to be closed
from under us.

Reported-by: syzbot+fbeeb5c3b538e8545644@syzkaller.appspotmail.com
Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agotun: send netlink notification when the device is modified
Sabrina Dubroca [Tue, 10 Apr 2018 14:28:56 +0000 (16:28 +0200)]
tun: send netlink notification when the device is modified

I added dumping of link information about tun devices over netlink in
commit 1ec010e70593 ("tun: export flags, uid, gid, queue information
over netlink"), but didn't add the missing netlink notifications when
the device's exported properties change.

This patch adds notifications when owner/group or flags are modified,
when queues are attached/detached, and when a tun fd is closed.

Reported-by: Thomas Haller <thaller@redhat.com>
Fixes: 1ec010e70593 ("tun: export flags, uid, gid, queue information over netlink")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agotun: set the flags before registering the netdevice
Sabrina Dubroca [Tue, 10 Apr 2018 14:28:55 +0000 (16:28 +0200)]
tun: set the flags before registering the netdevice

Otherwise, register_netdevice advertises the creation of the device with
the default flags, instead of what the user requested.

Reported-by: Thomas Haller <thaller@redhat.com>
Fixes: 1ec010e70593 ("tun: export flags, uid, gid, queue information over netlink")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agolan78xx: Don't reset the interface on open
Phil Elwell [Tue, 10 Apr 2018 12:18:25 +0000 (13:18 +0100)]
lan78xx: Don't reset the interface on open

Commit 92571a1aae40 ("lan78xx: Connect phy early") moves the PHY
initialisation into lan78xx_probe, but lan78xx_open subsequently calls
lan78xx_reset. As well as forcing a second round of link negotiation,
this reset frequently prevents the phy interrupt from being generated
(even though the link is up), rendering the interface unusable.

Fix this issue by removing the lan78xx_reset call from lan78xx_open.

Fixes: 92571a1aae40 ("lan78xx: Connect phy early")
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agoMerge branch 'bnxt_en-Fixes-for-net'
David S. Miller [Wed, 11 Apr 2018 18:42:00 +0000 (14:42 -0400)]
Merge branch 'bnxt_en-Fixes-for-net'

Michael Chan says:

====================
bnxt_en: Fixes for net.

This bug fix series include NULL pointer fixes in ethtool -x code path
and in the error clean up path when freeing IRQs, a ring accounting bug
that missed rings used by the RDMA driver, and 3 bug fixes related to TC
Flower and VF-reps.

v2: Fixed commit message of patch 4.  Changed the pound sign to $ sign
in front of the ip command.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agobnxt_en: Fix NULL pointer dereference at bnxt_free_irq().
Michael Chan [Wed, 11 Apr 2018 15:50:18 +0000 (11:50 -0400)]
bnxt_en: Fix NULL pointer dereference at bnxt_free_irq().

When open fails during ethtool -L ring change, for example, the driver
may crash at bnxt_free_irq() because bp->bnapi is NULL.

If we fail to allocate all the new rings, bnxt_open_nic() will free
all the memory including bp->bnapi.  Subsequent call to bnxt_close_nic()
will try to dereference bp->bnapi in bnxt_free_irq().

Fix it by checking for !bp->bnapi in bnxt_free_irq().

Fixes: e5811b8c09df ("bnxt_en: Add IRQ remapping logic.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agobnxt_en: Need to include RDMA rings in bnxt_check_rings().
Michael Chan [Wed, 11 Apr 2018 15:50:17 +0000 (11:50 -0400)]
bnxt_en: Need to include RDMA rings in bnxt_check_rings().

With recent changes to reserve both L2 and RDMA rings, we need to include
the RDMA rings in bnxt_check_rings().  Otherwise we will under-estimate
the rings we need during ethtool -L and may lead to failure.

Fixes: fbcfc8e46741 ("bnxt_en: Reserve completion rings and MSIX for bnxt_re RDMA driver.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agobnxt_en: Support max-mtu with VF-reps
Sriharsha Basavapatna [Wed, 11 Apr 2018 15:50:16 +0000 (11:50 -0400)]
bnxt_en: Support max-mtu with VF-reps

While a VF is configured with a bigger mtu (> 1500), any packets that
are punted to the VF-rep (slow-path) get dropped by OVS kernel-datapath
with the following message: "dropped over-mtu packet". Fix this by
returning the max-mtu value for a VF-rep derived from its corresponding VF.
VF-rep's mtu can be changed using 'ip' command as shown in this example:

$ ip link set bnxt0_pf0vf0 mtu 9000

Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agobnxt_en: Ignore src port field in decap filter nodes
Sriharsha Basavapatna [Wed, 11 Apr 2018 15:50:15 +0000 (11:50 -0400)]
bnxt_en: Ignore src port field in decap filter nodes

The driver currently uses src port field (along with other fields) in the
decap tunnel key, while looking up and adding tunnel nodes. This leads to
redundant cfa_decap_filter_alloc() requests to the FW and flow-miss in the
flow engine. Fix this by ignoring the src port field in decap tunnel nodes.

Fixes: f484f6782e01 ("bnxt_en: add hwrm FW cmds for cfa_encap_record and decap_filter")
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agobnxt_en: do not allow wildcard matches for L2 flows
Andy Gospodarek [Wed, 11 Apr 2018 15:50:14 +0000 (11:50 -0400)]
bnxt_en: do not allow wildcard matches for L2 flows

Before this patch the following commands would succeed as far as the
user was concerned:

$ tc qdisc add dev p1p1 ingress
$ tc filter add dev p1p1 parent ffff: protocol all \
flower skip_sw action drop
$ tc filter add dev p1p1 parent ffff: protocol ipv4 \
flower skip_sw src_mac 00:02:00:00:00:01/44 action drop

The current flow offload infrastructure used does not support wildcard
matching for ethernet headers, so do not allow the second or third
commands to succeed.  If a user wants to drop traffic on that interface
the protocol and MAC addresses need to be specified explicitly:

$ tc qdisc add dev p1p1 ingress
$ tc filter add dev p1p1 parent ffff: protocol arp \
flower skip_sw action drop
$ tc filter add dev p1p1 parent ffff: protocol ipv4 \
flower skip_sw action drop
...
$ tc filter add dev p1p1 parent ffff: protocol ipv4 \
flower skip_sw src_mac 00:02:00:00:00:01 action drop
$ tc filter add dev p1p1 parent ffff: protocol ipv4 \
flower skip_sw src_mac 00:02:00:00:00:02 action drop
...

There are also checks for VLAN parameters in this patch as other callers
may wildcard those parameters even if tc does not.  Using different
flow infrastructure could allow this to work in the future for L2 flows,
but for now it does not.

Fixes: 2ae7408fedfe ("bnxt_en: bnxt: add TC flower filter offload support")
Signed-off-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agobnxt_en: Fix ethtool -x crash when device is down.
Michael Chan [Wed, 11 Apr 2018 15:50:13 +0000 (11:50 -0400)]
bnxt_en: Fix ethtool -x crash when device is down.

Fix ethtool .get_rxfh() crash by checking for valid indirection table
address before copying the data.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
6 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Wed, 11 Apr 2018 17:51:26 +0000 (10:51 -0700)]
Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:

 - almost all of the rest of MM

 - kasan updates

 - lots of procfs work

 - misc things

 - lib/ updates

 - checkpatch

 - rapidio

 - ipc/shm updates

 - the start of willy's XArray conversion

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (140 commits)
  page cache: use xa_lock
  xarray: add the xa_lock to the radix_tree_root
  fscache: use appropriate radix tree accessors
  export __set_page_dirty
  unicore32: turn flush_dcache_mmap_lock into a no-op
  arm64: turn flush_dcache_mmap_lock into a no-op
  mac80211_hwsim: use DEFINE_IDA
  radix tree: use GFP_ZONEMASK bits of gfp_t for flags
  linux/const.h: refactor _BITUL and _BITULL a bit
  linux/const.h: move UL() macro to include/linux/const.h
  linux/const.h: prefix include guard of uapi/linux/const.h with _UAPI
  xen, mm: allow deferred page initialization for xen pv domains
  elf: enforce MAP_FIXED on overlaying elf segments
  fs, elf: drop MAP_FIXED usage from elf_map
  mm: introduce MAP_FIXED_NOREPLACE
  MAINTAINERS: update bouncing aacraid@adaptec.com addresses
  fs/dcache.c: add cond_resched() in shrink_dentry_list()
  include/linux/kfifo.h: fix comment
  ipc/shm.c: shm_split(): remove unneeded test for NULL shm_file_data.vm_ops
  kernel/sysctl.c: add kdoc comments to do_proc_do{u}intvec_minmax_conv_param
  ...

6 years agopage cache: use xa_lock
Matthew Wilcox [Tue, 10 Apr 2018 23:36:56 +0000 (16:36 -0700)]
page cache: use xa_lock

Remove the address_space ->tree_lock and use the xa_lock newly added to
the radix_tree_root.  Rename the address_space ->page_tree to ->i_pages,
since we don't really care that it's a tree.

[willy@infradead.org: fix nds32, fs/dax.c]
Link: http://lkml.kernel.org/r/20180406145415.GB20605@bombadil.infradead.orgLink:
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoxarray: add the xa_lock to the radix_tree_root
Matthew Wilcox [Tue, 10 Apr 2018 23:36:52 +0000 (16:36 -0700)]
xarray: add the xa_lock to the radix_tree_root

This results in no change in structure size on 64-bit machines as it
fits in the padding between the gfp_t and the void *.  32-bit machines
will grow the structure from 8 to 12 bytes.  Almost all radix trees are
protected with (at least) a spinlock, so as they are converted from
radix trees to xarrays, the data structures will shrink again.

Initialising the spinlock requires a name for the benefit of lockdep, so
RADIX_TREE_INIT() now needs to know the name of the radix tree it's
initialising, and so do IDR_INIT() and IDA_INIT().

Also add the xa_lock() and xa_unlock() family of wrappers to make it
easier to use the lock.  If we could rely on -fplan9-extensions in the
compiler, we could avoid all of this syntactic sugar, but that wasn't
added until gcc 4.6.

Link: http://lkml.kernel.org/r/20180313132639.17387-8-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agofscache: use appropriate radix tree accessors
Matthew Wilcox [Tue, 10 Apr 2018 23:36:48 +0000 (16:36 -0700)]
fscache: use appropriate radix tree accessors

Don't open-code accesses to data structure internals.

Link: http://lkml.kernel.org/r/20180313132639.17387-7-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoexport __set_page_dirty
Matthew Wilcox [Tue, 10 Apr 2018 23:36:44 +0000 (16:36 -0700)]
export __set_page_dirty

XFS currently contains a copy-and-paste of __set_page_dirty().  Export
it from buffer.c instead.

Link: http://lkml.kernel.org/r/20180313132639.17387-6-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agounicore32: turn flush_dcache_mmap_lock into a no-op
Matthew Wilcox [Tue, 10 Apr 2018 23:36:40 +0000 (16:36 -0700)]
unicore32: turn flush_dcache_mmap_lock into a no-op

Unicore doesn't walk the VMA tree in its flush_dcache_page()
implementation, so has no need to take the tree_lock.

Link: http://lkml.kernel.org/r/20180313132639.17387-5-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoarm64: turn flush_dcache_mmap_lock into a no-op
Matthew Wilcox [Tue, 10 Apr 2018 23:36:36 +0000 (16:36 -0700)]
arm64: turn flush_dcache_mmap_lock into a no-op

ARM64 doesn't walk the VMA tree in its flush_dcache_page()
implementation, so has no need to take the tree_lock.

Link: http://lkml.kernel.org/r/20180313132639.17387-4-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agomac80211_hwsim: use DEFINE_IDA
Matthew Wilcox [Tue, 10 Apr 2018 23:36:33 +0000 (16:36 -0700)]
mac80211_hwsim: use DEFINE_IDA

This is preferred to opencoding an IDA_INIT.

Link: http://lkml.kernel.org/r/20180313132639.17387-2-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoradix tree: use GFP_ZONEMASK bits of gfp_t for flags
Matthew Wilcox [Tue, 10 Apr 2018 23:36:28 +0000 (16:36 -0700)]
radix tree: use GFP_ZONEMASK bits of gfp_t for flags

Patch series "XArray", v9.  (First part thereof).

This patchset is, I believe, appropriate for merging for 4.17.  It
contains the XArray implementation, to eventually replace the radix
tree, and converts the page cache to use it.

This conversion keeps the radix tree and XArray data structures in sync
at all times.  That allows us to convert the page cache one function at
a time and should allow for easier bisection.  Other than renaming some
elements of the structures, the data structures are fundamentally
unchanged; a radix tree walk and an XArray walk will touch the same
number of cachelines.  I have changes planned to the XArray data
structure, but those will happen in future patches.

Improvements the XArray has over the radix tree:

 - The radix tree provides operations like other trees do; 'insert' and
   'delete'. But what most users really want is an automatically
   resizing array, and so it makes more sense to give users an API that
   is like an array -- 'load' and 'store'. We still have an 'insert'
   operation for users that really want that semantic.

 - The XArray considers locking as part of its API. This simplifies a
   lot of users who formerly had to manage their own locking just for
   the radix tree. It also improves code generation as we can now tell
   RCU that we're holding a lock and it doesn't need to generate as much
   fencing code. The other advantage is that tree nodes can be moved
   (not yet implemented).

 - GFP flags are now parameters to calls which may need to allocate
   memory. The radix tree forced users to decide what the allocation
   flags would be at creation time. It's much clearer to specify them at
   allocation time.

 - Memory is not preloaded; we don't tie up dozens of pages on the off
   chance that the slab allocator fails. Instead, we drop the lock,
   allocate a new node and retry the operation. We have to convert all
   the radix tree, IDA and IDR preload users before we can realise this
   benefit, but I have not yet found a user which cannot be converted.

 - The XArray provides a cmpxchg operation. The radix tree forces users
   to roll their own (and at least four have).

 - Iterators take a 'max' parameter. That simplifies many users and will
   reduce the amount of iteration done.

 - Iteration can proceed backwards. We only have one user for this, but
   since it's called as part of the pagefault readahead algorithm, that
   seemed worth mentioning.

 - RCU-protected pointers are not exposed as part of the API. There are
   some fun bugs where the page cache forgets to use rcu_dereference()
   in the current codebase.

 - Value entries gain an extra bit compared to radix tree exceptional
   entries. That gives us the extra bit we need to put huge page swap
   entries in the page cache.

 - Some iterators now take a 'filter' argument instead of having
   separate iterators for tagged/untagged iterations.

The page cache is improved by this:

 - Shorter, easier to read code

 - More efficient iterations

 - Reduction in size of struct address_space

 - Fewer walks from the top of the data structure; the XArray API
   encourages staying at the leaf node and conducting operations there.

This patch (of 8):

None of these bits may be used for slab allocations, so we can use them
as radix tree flags as long as we mask them off before passing them to
the slab allocator. Move the IDR flag from the high bits to the
GFP_ZONEMASK bits.

Link: http://lkml.kernel.org/r/20180313132639.17387-3-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agolinux/const.h: refactor _BITUL and _BITULL a bit
Masahiro Yamada [Tue, 10 Apr 2018 23:36:24 +0000 (16:36 -0700)]
linux/const.h: refactor _BITUL and _BITULL a bit

Minor cleanups available by _UL and _ULL.

Link: http://lkml.kernel.org/r/1519301715-31798-5-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agolinux/const.h: move UL() macro to include/linux/const.h
Masahiro Yamada [Tue, 10 Apr 2018 23:36:19 +0000 (16:36 -0700)]
linux/const.h: move UL() macro to include/linux/const.h

ARM, ARM64 and UniCore32 duplicate the definition of UL():

  #define UL(x) _AC(x, UL)

This is not actually arch-specific, so it will be useful to move it to a
common header.  Currently, we only have the uapi variant for
linux/const.h, so I am creating include/linux/const.h.

I also added _UL(), _ULL() and ULL() because _AC() is mostly used in
the form either _AC(..., UL) or _AC(..., ULL).  I expect they will be
replaced in follow-up cleanups.  The underscore-prefixed ones should
be used for exported headers.

Link: http://lkml.kernel.org/r/1519301715-31798-4-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agolinux/const.h: prefix include guard of uapi/linux/const.h with _UAPI
Masahiro Yamada [Tue, 10 Apr 2018 23:36:15 +0000 (16:36 -0700)]
linux/const.h: prefix include guard of uapi/linux/const.h with _UAPI

Patch series "linux/const.h: cleanups of macros such as UL(), _BITUL(),
BIT() etc", v3.

ARM, ARM64, UniCore32 define UL() as a shorthand of _AC(..., UL).  More
architectures may introduce it in the future.

UL() is arch-agnostic, and useful. So let's move it to
include/linux/const.h

Currently, <asm/memory.h> must be included to use UL().  It pulls in more
bloats just for defining some bit macros.

I posted V2 one year ago.

The previous posts are:
https://patchwork.kernel.org/patch/9498273/
https://patchwork.kernel.org/patch/9498275/
https://patchwork.kernel.org/patch/9498269/
https://patchwork.kernel.org/patch/9498271/

At that time, what blocked this series was a comment from
David Howells:
  You need to be very careful doing this.  Some userspace stuff
  depends on the guard macro names on the kernel header files.

(https://patchwork.kernel.org/patch/9498275/)

Looking at the code closer, I noticed this is not a problem.

See the following line.
https://github.com/torvalds/linux/blob/v4.16-rc2/scripts/headers_install.sh#L40

scripts/headers_install.sh rips off _UAPI prefix from guard macro names.

I ran "make headers_install" and confirmed the result is what I expect.

So, we can prefix the include guard of include/uapi/linux/const.h,
and add a new include/linux/const.h.

This patch (of 4):

I am going to add include/linux/const.h for the kernel space.

Add _UAPI to the include guard of include/uapi/linux/const.h to
prepare for that.

Please notice the guard name of the exported one will be kept as-is.
So, this commit has no impact to the userspace even if some userspace
stuff depends on the guard macro names.

scripts/headers_install.sh processes exported headers by SED, and
rips off "_UAPI" from guard macro names.

  #ifndef _UAPI_LINUX_CONST_H
  #define _UAPI_LINUX_CONST_H

will be turned into

  #ifndef _LINUX_CONST_H
  #define _LINUX_CONST_H

Link: http://lkml.kernel.org/r/1519301715-31798-2-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoxen, mm: allow deferred page initialization for xen pv domains
Pavel Tatashin [Tue, 10 Apr 2018 23:36:10 +0000 (16:36 -0700)]
xen, mm: allow deferred page initialization for xen pv domains

Juergen Gross noticed that commit f7f99100d8d ("mm: stop zeroing memory
during allocation in vmemmap") broke XEN PV domains when deferred struct
page initialization is enabled.

This is because the xen's PagePinned() flag is getting erased from
struct pages when they are initialized later in boot.

Juergen fixed this problem by disabling deferred pages on xen pv
domains.  It is desirable, however, to have this feature available as it
reduces boot time.  This fix re-enables the feature for pv-dmains, and
fixes the problem the following way:

The fix is to delay setting PagePinned flag until struct pages for all
allocated memory are initialized, i.e.  until after free_all_bootmem().

A new x86_init.hyper op init_after_bootmem() is called to let xen know
that boot allocator is done, and hence struct pages for all the
allocated memory are now initialized.  If deferred page initialization
is enabled, the rest of struct pages are going to be initialized later
in boot once page_alloc_init_late() is called.

xen_after_bootmem() walks page table's pages and marks them pinned.

Link: http://lkml.kernel.org/r/20180226160112.24724-2-pasha.tatashin@oracle.com
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Tested-by: Juergen Gross <jgross@suse.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Mathias Krause <minipli@googlemail.com>
Cc: Jinbum Park <jinb.park7@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Jia Zhang <zhang.jia@linux.alibaba.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoelf: enforce MAP_FIXED on overlaying elf segments
Michal Hocko [Tue, 10 Apr 2018 23:36:05 +0000 (16:36 -0700)]
elf: enforce MAP_FIXED on overlaying elf segments

Anshuman has reported that with "fs, elf: drop MAP_FIXED usage from
elf_map" applied, some ELF binaries in his environment fail to start
with

 [   23.423642] 9148 (sed): Uhuuh, elf segment at 0000000010030000 requested but the memory is mapped already
 [   23.423706] requested [1003000010040000] mapped [1003000010040000] 100073 anon

The reason is that the above binary has overlapping elf segments:

  LOAD           0x0000000000000000 0x0000000010000000 0x0000000010000000
                 0x0000000000013a8c 0x0000000000013a8c  R E    10000
  LOAD           0x000000000001fd40 0x000000001002fd40 0x000000001002fd40
                 0x00000000000002c0 0x00000000000005e8  RW     10000
  LOAD           0x0000000000020328 0x0000000010030328 0x0000000010030328
                 0x0000000000000384 0x00000000000094a0  RW     10000

That binary has two RW LOAD segments, the first crosses a page border
into the second

  0x1002fd40 (LOAD2-vaddr) + 0x5e8 (LOAD2-memlen) == 0x10030328 (LOAD3-vaddr)

Handle this situation by enforcing MAP_FIXED when we establish a
temporary brk VMA to handle overlapping segments.  All other mappings
will still use MAP_FIXED_NOREPLACE.

Link: http://lkml.kernel.org/r/20180213100440.GM3443@dhcp22.suse.cz
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Andrei Vagin <avagin@openvz.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Kees Cook <keescook@chromium.org>
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agofs, elf: drop MAP_FIXED usage from elf_map
Michal Hocko [Tue, 10 Apr 2018 23:36:01 +0000 (16:36 -0700)]
fs, elf: drop MAP_FIXED usage from elf_map

Both load_elf_interp and load_elf_binary rely on elf_map to map segments
on a controlled address and they use MAP_FIXED to enforce that.  This is
however dangerous thing prone to silent data corruption which can be
even exploitable.

Let's take CVE-2017-1000253 as an example.  At the time (before commit
eab09532d400: "binfmt_elf: use ELF_ET_DYN_BASE only for PIE")
ELF_ET_DYN_BASE was at TASK_SIZE / 3 * 2 which is not that far away from
the stack top on 32b (legacy) memory layout (only 1GB away).  Therefore
we could end up mapping over the existing stack with some luck.

The issue has been fixed since then (a87938b2e246: "fs/binfmt_elf.c: fix
bug in loading of PIE binaries"), ELF_ET_DYN_BASE moved moved much
further from the stack (eab09532d400 and later by c715b72c1ba4: "mm:
revert x86_64 and arm64 ELF_ET_DYN_BASE base changes") and excessive
stack consumption early during execve fully stopped by da029c11e6b1
("exec: Limit arg stack to at most 75% of _STK_LIM").  So we should be
safe and any attack should be impractical.  On the other hand this is
just too subtle assumption so it can break quite easily and hard to
spot.

I believe that the MAP_FIXED usage in load_elf_binary (et. al) is still
fundamentally dangerous.  Moreover it shouldn't be even needed.  We are
at the early process stage and so there shouldn't be unrelated mappings
(except for stack and loader) existing so mmap for a given address should
succeed even without MAP_FIXED.  Something is terribly wrong if this is
not the case and we should rather fail than silently corrupt the
underlying mapping.

Address this issue by changing MAP_FIXED to the newly added
MAP_FIXED_NOREPLACE.  This will mean that mmap will fail if there is an
existing mapping clashing with the requested one without clobbering it.

[mhocko@suse.com: fix build]
[akpm@linux-foundation.org: coding-style fixes]
[avagin@openvz.org: don't use the same value for MAP_FIXED_NOREPLACE and MAP_SYNC]
Link: http://lkml.kernel.org/r/20171218184916.24445-1-avagin@openvz.org
Link: http://lkml.kernel.org/r/20171213092550.2774-3-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agomm: introduce MAP_FIXED_NOREPLACE
Michal Hocko [Tue, 10 Apr 2018 23:35:57 +0000 (16:35 -0700)]
mm: introduce MAP_FIXED_NOREPLACE

Patch series "mm: introduce MAP_FIXED_NOREPLACE", v2.

This has started as a follow up discussion [3][4] resulting in the
runtime failure caused by hardening patch [5] which removes MAP_FIXED
from the elf loader because MAP_FIXED is inherently dangerous as it
might silently clobber an existing underlying mapping (e.g.  stack).
The reason for the failure is that some architectures enforce an
alignment for the given address hint without MAP_FIXED used (e.g.  for
shared or file backed mappings).

One way around this would be excluding those archs which do alignment
tricks from the hardening [6].  The patch is really trivial but it has
been objected, rightfully so, that this screams for a more generic
solution.  We basically want a non-destructive MAP_FIXED.

The first patch introduced MAP_FIXED_NOREPLACE which enforces the given
address but unlike MAP_FIXED it fails with EEXIST if the given range
conflicts with an existing one.  The flag is introduced as a completely
new one rather than a MAP_FIXED extension because of the backward
compatibility.  We really want a never-clobber semantic even on older
kernels which do not recognize the flag.  Unfortunately mmap sucks
wrt flags evaluation because we do not EINVAL on unknown flags.  On
those kernels we would simply use the traditional hint based semantic so
the caller can still get a different address (which sucks) but at least
not silently corrupt an existing mapping.  I do not see a good way
around that.  Except we won't export expose the new semantic to the
userspace at all.

It seems there are users who would like to have something like that.
Jemalloc has been mentioned by Michael Ellerman [7]

Florian Weimer has mentioned the following:
: glibc ld.so currently maps DSOs without hints.  This means that the kernel
: will map right next to each other, and the offsets between them a completely
: predictable.  We would like to change that and supply a random address in a
: window of the address space.  If there is a conflict, we do not want the
: kernel to pick a non-random address. Instead, we would try again with a
: random address.

John Hubbard has mentioned CUDA example
: a) Searches /proc/<pid>/maps for a "suitable" region of available
: VA space.  "Suitable" generally means it has to have a base address
: within a certain limited range (a particular device model might
: have odd limitations, for example), it has to be large enough, and
: alignment has to be large enough (again, various devices may have
: constraints that lead us to do this).
:
: This is of course subject to races with other threads in the process.
:
: Let's say it finds a region starting at va.
:
: b) Next it does:
:     p = mmap(va, ...)
:
: *without* setting MAP_FIXED, of course (so va is just a hint), to
: attempt to safely reserve that region. If p != va, then in most cases,
: this is a failure (almost certainly due to another thread getting a
: mapping from that region before we did), and so this layer now has to
: call munmap(), before returning a "failure: retry" to upper layers.
:
:     IMPROVEMENT: --> if instead, we could call this:
:
:             p = mmap(va, ... MAP_FIXED_NOREPLACE ...)
:
:         , then we could skip the munmap() call upon failure. This
:         is a small thing, but it is useful here. (Thanks to Piotr
:         Jaroszynski and Mark Hairgrove for helping me get that detail
:         exactly right, btw.)
:
: c) After that, CUDA suballocates from p, via:
:
:      q = mmap(sub_region_start, ... MAP_FIXED ...)
:
: Interestingly enough, "freeing" is also done via MAP_FIXED, and
: setting PROT_NONE to the subregion. Anyway, I just included (c) for
: general interest.

Atomic address range probing in the multithreaded programs in general
sounds like an interesting thing to me.

The second patch simply replaces MAP_FIXED use in elf loader by
MAP_FIXED_NOREPLACE.  I believe other places which rely on MAP_FIXED
should follow.  Actually real MAP_FIXED usages should be docummented
properly and they should be more of an exception.

[1] http://lkml.kernel.org/r/20171116101900.13621-1-mhocko@kernel.org
[2] http://lkml.kernel.org/r/20171129144219.22867-1-mhocko@kernel.org
[3] http://lkml.kernel.org/r/20171107162217.382cd754@canb.auug.org.au
[4] http://lkml.kernel.org/r/1510048229.12079.7.camel@abdul.in.ibm.com
[5] http://lkml.kernel.org/r/20171023082608.6167-1-mhocko@kernel.org
[6] http://lkml.kernel.org/r/20171113094203.aofz2e7kueitk55y@dhcp22.suse.cz
[7] http://lkml.kernel.org/r/87efp1w7vy.fsf@concordia.ellerman.id.au

This patch (of 2):

MAP_FIXED is used quite often to enforce mapping at the particular range.
The main problem of this flag is, however, that it is inherently dangerous
because it unmaps existing mappings covered by the requested range.  This
can cause silent memory corruptions.  Some of them even with serious
security implications.  While the current semantic might be really
desiderable in many cases there are others which would want to enforce the
given range but rather see a failure than a silent memory corruption on a
clashing range.  Please note that there is no guarantee that a given range
is obeyed by the mmap even when it is free - e.g.  arch specific code is
allowed to apply an alignment.

Introduce a new MAP_FIXED_NOREPLACE flag for mmap to achieve this
behavior.  It has the same semantic as MAP_FIXED wrt.  the given address
request with a single exception that it fails with EEXIST if the requested
address is already covered by an existing mapping.  We still do rely on
get_unmaped_area to handle all the arch specific MAP_FIXED treatment and
check for a conflicting vma after it returns.

The flag is introduced as a completely new one rather than a MAP_FIXED
extension because of the backward compatibility.  We really want a
never-clobber semantic even on older kernels which do not recognize the
flag.  Unfortunately mmap sucks wrt.  flags evaluation because we do not
EINVAL on unknown flags.  On those kernels we would simply use the
traditional hint based semantic so the caller can still get a different
address (which sucks) but at least not silently corrupt an existing
mapping.  I do not see a good way around that.

[mpe@ellerman.id.au: fix whitespace]
[fail on clashing range with EEXIST as per Florian Weimer]
[set MAP_FIXED before round_hint_to_min as per Khalid Aziz]
Link: http://lkml.kernel.org/r/20171213092550.2774-2-mhocko@kernel.org
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Kees Cook <keescook@chromium.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Jason Evans <jasone@google.com>
Cc: David Goldblatt <davidtgoldblatt@gmail.com>
Cc: Edward Tomasz Napierała <trasz@FreeBSD.org>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoMAINTAINERS: update bouncing aacraid@adaptec.com addresses
Joe Perches [Tue, 10 Apr 2018 23:35:53 +0000 (16:35 -0700)]
MAINTAINERS: update bouncing aacraid@adaptec.com addresses

Adaptec is now part of Microsemi.

Commit 2a81ffdd9da1 ("MAINTAINERS: Update email address for aacraid")
updated only one of the driver maintainer addresses.

Update the other two sections as the aacraid@adaptec.com address
bounces.

Link: http://lkml.kernel.org/r/1522103936.12357.27.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Dave Carroll <david.carroll@microsemi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agofs/dcache.c: add cond_resched() in shrink_dentry_list()
Nikolay Borisov [Tue, 10 Apr 2018 23:35:49 +0000 (16:35 -0700)]
fs/dcache.c: add cond_resched() in shrink_dentry_list()

As previously reported (https://patchwork.kernel.org/patch/8642031/)
it's possible to call shrink_dentry_list with a large number of dentries
(> 10000).  This, in turn, could trigger the softlockup detector and
possibly trigger a panic.  In addition to the unmount path being
vulnerable to this scenario, at SuSE we've observed similar situation
happening during process exit on processes that touch a lot of dentries.
Here is an excerpt from a crash dump.  The number after the colon are
the number of dentries on the list passed to shrink_dentry_list:

PID 99760: 10722
PID 107530: 215
PID 108809: 24134
PID 108877: 21331
PID 141708: 16487

So we want to kill between 15k-25k dentries without yielding.

And one possible call stack looks like:

4 [ffff8839ece41db0] _raw_spin_lock at ffffffff8152a5f8
5 [ffff8839ece41db0] evict at ffffffff811c3026
6 [ffff8839ece41dd0] __dentry_kill at ffffffff811bf258
7 [ffff8839ece41df0] shrink_dentry_list at ffffffff811bf593
8 [ffff8839ece41e18] shrink_dcache_parent at ffffffff811bf830
9 [ffff8839ece41e50] proc_flush_task at ffffffff8120dd61
10 [ffff8839ece41ec0] release_task at ffffffff81059ebd
11 [ffff8839ece41f08] do_exit at ffffffff8105b8ce
12 [ffff8839ece41f78] sys_exit at ffffffff8105bd53
13 [ffff8839ece41f80] system_call_fastpath at ffffffff81532909

While some of the callers of shrink_dentry_list do use cond_resched,
this is not sufficient to prevent softlockups.  So just move
cond_resched into shrink_dentry_list from its callers.

David said: I've found hundreds of occurrences of warnings that we emit
when need_resched stays set for a prolonged period of time with the
stack trace that is included in the change log.

Link: http://lkml.kernel.org/r/1521718946-31521-1-git-send-email-nborisov@suse.com
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoinclude/linux/kfifo.h: fix comment
Valentin Vidic [Tue, 10 Apr 2018 23:35:46 +0000 (16:35 -0700)]
include/linux/kfifo.h: fix comment

Clean up unusual formatting in the note about locking.

Link: http://lkml.kernel.org/r/20180324002630.13046-1-Valentin.Vidic@CARNet.hr
Signed-off-by: Valentin Vidic <Valentin.Vidic@CARNet.hr>
Cc: Stefani Seibold <stefani@seibold.net>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Sean Young <sean@mess.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoipc/shm.c: shm_split(): remove unneeded test for NULL shm_file_data.vm_ops
Andrew Morton [Tue, 10 Apr 2018 23:35:42 +0000 (16:35 -0700)]
ipc/shm.c: shm_split(): remove unneeded test for NULL shm_file_data.vm_ops

This was added by the recent "ipc/shm.c: add split function to
shm_vm_ops", but it is not necessary.

Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agokernel/sysctl.c: add kdoc comments to do_proc_do{u}intvec_minmax_conv_param
Waiman Long [Tue, 10 Apr 2018 23:35:38 +0000 (16:35 -0700)]
kernel/sysctl.c: add kdoc comments to do_proc_do{u}intvec_minmax_conv_param

Kdoc comments are added to the do_proc_dointvec_minmax_conv_param and
do_proc_douintvec_minmax_conv_param structures thare are used internally
for range checking.

The error codes returned by proc_dointvec_minmax() and
proc_douintvec_minmax() are also documented.

Link: http://lkml.kernel.org/r/1519926220-7453-3-git-send-email-longman@redhat.com
Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agofs/proc/proc_sysctl.c: fix typo in sysctl_check_table_array()
Waiman Long [Tue, 10 Apr 2018 23:35:35 +0000 (16:35 -0700)]
fs/proc/proc_sysctl.c: fix typo in sysctl_check_table_array()

Patch series "ipc: Clamp *mni to the real IPCMNI limit", v3.

The sysctl parameters msgmni, shmmni and semmni have an inherent limit
of IPC_MNI (32k).  However, users may not be aware of that because they
can write a value much higher than that without getting any error or
notification.  Reading the parameters back will show the newly written
values which are not real.

Enforcing the limit by failing sysctl parameter write, however, can
break existing user applications.  To address this delemma, a new flags
field is introduced into the ctl_table.  The value CTL_FLAGS_CLAMP_RANGE
can be added to any ctl_table entries to enable a looser range clamping
without returning any error.  For example,

  .flags = CTL_FLAGS_CLAMP_RANGE,

This flags value are now used for the range checking of shmmni, msgmni
and semmni without breaking existing applications.  If any out of range
value is written to those sysctl parameters, the following warning will
be printed instead.

  Kernel parameter "shmmni" was set out of range [0, 32768], clamped to 32768.

Reading the values back will show 32768 instead of some fake values.

This patch (of 6):

Fix a typo.

Link: http://lkml.kernel.org/r/1519926220-7453-2-git-send-email-longman@redhat.com
Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoipc/msg: introduce msgctl(MSG_STAT_ANY)
Davidlohr Bueso [Tue, 10 Apr 2018 23:35:30 +0000 (16:35 -0700)]
ipc/msg: introduce msgctl(MSG_STAT_ANY)

There is a permission discrepancy when consulting msq ipc object
metadata between /proc/sysvipc/msg (0444) and the MSG_STAT shmctl
command.  The later does permission checks for the object vs S_IRUGO.
As such there can be cases where EACCESS is returned via syscall but the
info is displayed anyways in the procfs files.

While this might have security implications via info leaking (albeit no
writing to the msq metadata), this behavior goes way back and showing
all the objects regardless of the permissions was most likely an
overlook - so we are stuck with it.  Furthermore, modifying either the
syscall or the procfs file can cause userspace programs to break (ie
ipcs).  Some applications require getting the procfs info (without root
privileges) and can be rather slow in comparison with a syscall -- up to
500x in some reported cases for shm.

This patch introduces a new MSG_STAT_ANY command such that the msq ipc
object permissions are ignored, and only audited instead.  In addition,
I've left the lsm security hook checks in place, as if some policy can
block the call, then the user has no other choice than just parsing the
procfs file.

Link: http://lkml.kernel.org/r/20180215162458.10059-4-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Reported-by: Robert Kettler <robert.kettler@outlook.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoipc/sem: introduce semctl(SEM_STAT_ANY)
Davidlohr Bueso [Tue, 10 Apr 2018 23:35:26 +0000 (16:35 -0700)]
ipc/sem: introduce semctl(SEM_STAT_ANY)

There is a permission discrepancy when consulting shm ipc object
metadata between /proc/sysvipc/sem (0444) and the SEM_STAT semctl
command.  The later does permission checks for the object vs S_IRUGO.
As such there can be cases where EACCESS is returned via syscall but the
info is displayed anyways in the procfs files.

While this might have security implications via info leaking (albeit no
writing to the sma metadata), this behavior goes way back and showing
all the objects regardless of the permissions was most likely an
overlook - so we are stuck with it.  Furthermore, modifying either the
syscall or the procfs file can cause userspace programs to break (ie
ipcs).  Some applications require getting the procfs info (without root
privileges) and can be rather slow in comparison with a syscall -- up to
500x in some reported cases for shm.

This patch introduces a new SEM_STAT_ANY command such that the sem ipc
object permissions are ignored, and only audited instead.  In addition,
I've left the lsm security hook checks in place, as if some policy can
block the call, then the user has no other choice than just parsing the
procfs file.

Link: http://lkml.kernel.org/r/20180215162458.10059-3-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Reported-by: Robert Kettler <robert.kettler@outlook.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoipc/shm: introduce shmctl(SHM_STAT_ANY)
Davidlohr Bueso [Tue, 10 Apr 2018 23:35:23 +0000 (16:35 -0700)]
ipc/shm: introduce shmctl(SHM_STAT_ANY)

Patch series "sysvipc: introduce STAT_ANY commands", v2.

The following patches adds the discussed (see [1]) new command for shm
as well as for sems and msq as they are subject to the same
discrepancies for ipc object permission checks between the syscall and
via procfs.  These new commands are justified in that (1) we are stuck
with this semantics as changing syscall and procfs can break userland;
and (2) some users can benefit from performance (for large amounts of
shm segments, for example) from not having to parse the procfs
interface.

Once merged, I will submit the necesary manpage updates.  But I'm thinking
something like:

: diff --git a/man2/shmctl.2 b/man2/shmctl.2
: index 7bb503999941..bb00bbe21a57 100644
: --- a/man2/shmctl.2
: +++ b/man2/shmctl.2
: @@ -41,6 +41,7 @@
:  .\" 2005-04-25, mtk -- noted aberrant Linux behavior w.r.t. new
:  .\" attaches to a segment that has already been marked for deletion.
:  .\" 2005-08-02, mtk: Added IPC_INFO, SHM_INFO, SHM_STAT descriptions.
: +.\" 2018-02-13, dbueso: Added SHM_STAT_ANY description.
:  .\"
:  .TH SHMCTL 2 2017-09-15 "Linux" "Linux Programmer's Manual"
:  .SH NAME
: @@ -242,6 +243,18 @@ However, the
:  argument is not a segment identifier, but instead an index into
:  the kernel's internal array that maintains information about
:  all shared memory segments on the system.
: +.TP
: +.BR SHM_STAT_ANY " (Linux-specific)"
: +Return a
: +.I shmid_ds
: +structure as for
: +.BR SHM_STAT .
: +However, the
: +.I shm_perm.mode
: +is not checked for read access for
: +.IR shmid ,
: +resembing the behaviour of
: +/proc/sysvipc/shm.
:  .PP
:  The caller can prevent or allow swapping of a shared
:  memory segment with the following \fIcmd\fP values:
: @@ -287,7 +300,7 @@ operation returns the index of the highest used entry in the
:  kernel's internal array recording information about all
:  shared memory segments.
:  (This information can be used with repeated
: -.B SHM_STAT
: +.B SHM_STAT/SHM_STAT_ANY
:  operations to obtain information about all shared memory segments
:  on the system.)
:  A successful
: @@ -328,7 +341,7 @@ isn't accessible.
:  \fIshmid\fP is not a valid identifier, or \fIcmd\fP
:  is not a valid command.
:  Or: for a
: -.B SHM_STAT
: +.B SHM_STAT/SHM_STAT_ANY
:  operation, the index value specified in
:  .I shmid
:  referred to an array slot that is currently unused.

This patch (of 3):

There is a permission discrepancy when consulting shm ipc object metadata
between /proc/sysvipc/shm (0444) and the SHM_STAT shmctl command.  The
later does permission checks for the object vs S_IRUGO.  As such there can
be cases where EACCESS is returned via syscall but the info is displayed
anyways in the procfs files.

While this might have security implications via info leaking (albeit no
writing to the shm metadata), this behavior goes way back and showing all
the objects regardless of the permissions was most likely an overlook - so
we are stuck with it.  Furthermore, modifying either the syscall or the
procfs file can cause userspace programs to break (ie ipcs).  Some
applications require getting the procfs info (without root privileges) and
can be rather slow in comparison with a syscall -- up to 500x in some
reported cases.

This patch introduces a new SHM_STAT_ANY command such that the shm ipc
object permissions are ignored, and only audited instead.  In addition,
I've left the lsm security hook checks in place, as if some policy can
block the call, then the user has no other choice than just parsing the
procfs file.

[1] https://lkml.org/lkml/2017/12/19/220

Link: http://lkml.kernel.org/r/20180215162458.10059-2-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Robert Kettler <robert.kettler@outlook.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agokernel/params.c: downgrade warning for unsafe parameters
Chris Wilson [Tue, 10 Apr 2018 23:35:18 +0000 (16:35 -0700)]
kernel/params.c: downgrade warning for unsafe parameters

As using an unsafe module parameter is, by its very definition, an
expected user action, emitting a warning is overkill.  Nothing has yet
gone wrong, and we add a taint flag for any future oops should something
actually go wrong.  So instead of having a user controllable pr_warn,
downgrade it to a pr_notice for "a normal, but significant condition".

We make use of unsafe kernel parameters in igt
(https://cgit.freedesktop.org/drm/igt-gpu-tools/) (we have not yet
succeeded in removing all such debugging options), which generates a
warning and taints the kernel.  The warning is unhelpful as we then need
to filter it out again as we check that every test themselves do not
provoke any kernel warnings.

Link: http://lkml.kernel.org/r/20180226151919.9674-1-chris@chris-wilson.co.uk
Fixes: 91f9d330cc14 ("module: make it possible to have unsafe, tainting module params")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agokernel/sysctl.c: fix sizeof argument to match variable name
Randy Dunlap [Tue, 10 Apr 2018 23:35:14 +0000 (16:35 -0700)]
kernel/sysctl.c: fix sizeof argument to match variable name

Fix sizeof argument to be the same as the data variable name.  Probably
a copy/paste error.

Mostly harmless since both variables are unsigned int.

Fixes kernel bugzilla #197371:
  Possible access to unintended variable in "kernel/sysctl.c" line 1339
https://bugzilla.kernel.org/show_bug.cgi?id=197371

Link: http://lkml.kernel.org/r/e0d0531f-361e-ef5f-8499-32743ba907e1@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Petru Mihancea <petrum@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agorapidio: use a reference count for struct mport_dma_req
Ioan Nicu [Tue, 10 Apr 2018 23:35:10 +0000 (16:35 -0700)]
rapidio: use a reference count for struct mport_dma_req

Once the dma request is passed to the DMA engine, the DMA subsystem
would hold a pointer to this structure and could call the completion
callback after do_dma_request() has timed out.

The current code deals with this by putting timed out SYNC requests to a
pending list and freeing them later, when the mport cdev device is
released.  This still does not guarantee that the DMA subsystem is
really done with those transfers, so in theory
dma_xfer_callback/dma_req_free could be called after
mport_cdev_release_dma and could potentially access already freed
memory.

This patch simplifies the current handling by using a kref in the mport
dma request structure, so that it gets freed only when nobody uses it
anymore.

This also simplifies the code a bit, as FAF transfers are now handled in
the same way as SYNC and ASYNC transfers.  There is no need anymore for
the pending list and for the dma workqueue which was used in case of FAF
transfers, so we remove them both.

Link: http://lkml.kernel.org/r/20180405203342.GA16191@nokia.com
Signed-off-by: Ioan Nicu <ioan.nicu.ext@nokia.com>
Acked-by: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Barry Wood <barry.wood@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Frank Kunz <frank.kunz@nokia.com>
Cc: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agodrivers/rapidio/rio-scan.c: fix typo in comment
Vasyl Gomonovych [Tue, 10 Apr 2018 23:35:06 +0000 (16:35 -0700)]
drivers/rapidio/rio-scan.c: fix typo in comment

Fix typo in the words 'receiver', 'specified', 'during'

Link: http://lkml.kernel.org/r/20180321211035.8904-1-gomonovych@gmail.com
Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Alexandre Bounine <alexandre.bounine@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoexec: pin stack limit during exec
Kees Cook [Tue, 10 Apr 2018 23:35:01 +0000 (16:35 -0700)]
exec: pin stack limit during exec

Since the stack rlimit is used in multiple places during exec and it can
be changed via other threads (via setrlimit()) or processes (via
prlimit()), the assumption that the value doesn't change cannot be made.
This leads to races with mm layout selection and argument size
calculations.  This changes the exec path to use the rlimit stored in
bprm instead of in current.  Before starting the thread, the bprm stack
rlimit is stored back to current.

Link: http://lkml.kernel.org/r/1518638796-20819-4-git-send-email-keescook@chromium.org
Fixes: 64701dee4178e ("exec: Use sane stack rlimit under secureexec")
Signed-off-by: Kees Cook <keescook@chromium.org>
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Reported-by: Andy Lutomirski <luto@kernel.org>
Reported-by: Brad Spengler <spender@grsecurity.net>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Greg KH <greg@kroah.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoexec: introduce finalize_exec() before start_thread()
Kees Cook [Tue, 10 Apr 2018 23:34:57 +0000 (16:34 -0700)]
exec: introduce finalize_exec() before start_thread()

Provide a final callback into fs/exec.c before start_thread() takes
over, to handle any last-minute changes, like the coming restoration of
the stack limit.

Link: http://lkml.kernel.org/r/1518638796-20819-3-git-send-email-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Brad Spengler <spender@grsecurity.net>
Cc: Greg KH <greg@kroah.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoexec: pass stack rlimit into mm layout functions
Kees Cook [Tue, 10 Apr 2018 23:34:53 +0000 (16:34 -0700)]
exec: pass stack rlimit into mm layout functions

Patch series "exec: Pin stack limit during exec".

Attempts to solve problems with the stack limit changing during exec
continue to be frustrated[1][2].  In addition to the specific issues
around the Stack Clash family of flaws, Andy Lutomirski pointed out[3]
other places during exec where the stack limit is used and is assumed to
be unchanging.  Given the many places it gets used and the fact that it
can be manipulated/raced via setrlimit() and prlimit(), I think the only
way to handle this is to move away from the "current" view of the stack
limit and instead attach it to the bprm, and plumb this down into the
functions that need to know the stack limits.  This series implements
the approach.

[1] 04e35f4495dd ("exec: avoid RLIMIT_STACK races with prlimit()")
[2] 779f4e1c6c7c ("Revert "exec: avoid RLIMIT_STACK races with prlimit()"")
[3] to security@kernel.org, "Subject: existing rlimit races?"

This patch (of 3):

Since it is possible that the stack rlimit can change externally during
exec (either via another thread calling setrlimit() or another process
calling prlimit()), provide a way to pass the rlimit down into the
per-architecture mm layout functions so that the rlimit can stay in the
bprm structure instead of sitting in the signal structure until exec is
finalized.

Link: http://lkml.kernel.org/r/1518638796-20819-2-git-send-email-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Hugh Dickins <hughd@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Greg KH <greg@kroah.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoseq_file: account everything to kmemcg
Alexey Dobriyan [Tue, 10 Apr 2018 23:34:49 +0000 (16:34 -0700)]
seq_file: account everything to kmemcg

All it takes to open a file and read 1 byte from it.

seq_file will be allocated along with any private allocations, and more
importantly seq file buffer which is 1 page by default.

Link: http://lkml.kernel.org/r/20180310085252.GB17121@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoseq_file: allocate seq_file from kmem_cache
Alexey Dobriyan [Tue, 10 Apr 2018 23:34:45 +0000 (16:34 -0700)]
seq_file: allocate seq_file from kmem_cache

For fine-grained debugging and usercopy protection.

Link: http://lkml.kernel.org/r/20180310085027.GA17121@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agofs/reiserfs/journal.c: add missing resierfs_warning() arg
Andrew Morton [Tue, 10 Apr 2018 23:34:41 +0000 (16:34 -0700)]
fs/reiserfs/journal.c: add missing resierfs_warning() arg

One use of the reiserfs_warning() macro in journal_init_dev() is missing
a parameter, causing the following warning:

  REISERFS warning (device loop0): journal_init_dev: Cannot open '%s': %i journal_init_dev:

This also causes a WARN_ONCE() warning in the vsprintf code, and then a
panic if panic_on_warn is set.

  Please remove unsupported %/ in format string
  WARNING: CPU: 1 PID: 4480 at lib/vsprintf.c:2138 format_decode+0x77f/0x830 lib/vsprintf.c:2138
  Kernel panic - not syncing: panic_on_warn set ...

Just add another string argument to the macro invocation.

Addresses https://syzkaller.appspot.com/bug?id=0627d4551fdc39bf1ef5d82cd9eef587047f7718

Link: http://lkml.kernel.org/r/d678ebe1-6f54-8090-df4c-b9affad62293@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: <syzbot+6bd77b88c1977c03f584@syzkaller.appspotmail.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Jeff Mahoney <jeffm@suse.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jan Kara <jack@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoautofs4: use wait_event_killable
Matthew Wilcox [Tue, 10 Apr 2018 23:34:37 +0000 (16:34 -0700)]
autofs4: use wait_event_killable

This playing with signals to allow only fatal signals appears to predate
the introduction of wait_event_killable(), and I'm fairly sure that
wait_event_killable is what was meant to happen here.

[avagin@openvz.org: use wake_up() instead of wake_up_interruptible]
Link: http://lkml.kernel.org/r/20180331022839.21277-1-avagin@openvz.org
Link: http://lkml.kernel.org/r/20180319191609.23880-1-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Ian Kent <raven@themaw.net>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoinit/ramdisk: use pr_cont() at the end of ramdisk loading
Aaro Koskinen [Tue, 10 Apr 2018 23:34:34 +0000 (16:34 -0700)]
init/ramdisk: use pr_cont() at the end of ramdisk loading

Use pr_cont() at the end of ramdisk loading.  This will avoid the
rotator and an extra newline appearing in the dmesg.

Before:
  RAMDISK: Loading 2436KiB [1 disk] into ram disk... |
  done.

After:
  RAMDISK: Loading 2436KiB [1 disk] into ram disk... done.

Link: http://lkml.kernel.org/r/20180302205552.16031-1-aaro.koskinen@iki.fi
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: whinge about bool bitfields
Joe Perches [Tue, 10 Apr 2018 23:34:25 +0000 (16:34 -0700)]
checkpatch: whinge about bool bitfields

Using bool in a bitfield isn't a good idea as the alignment behavior is
arch implementation defined.

Suggest using unsigned int or u<8|16|32> instead.

Link: http://lkml.kernel.org/r/e22fb871b1b7f2fda4b22f3a24e0d7f092eb612c.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: allow space between colon and bracket
Heinrich Schuchardt [Tue, 10 Apr 2018 23:34:14 +0000 (16:34 -0700)]
checkpatch: allow space between colon and bracket

Allow a space between a colon and subsequent opening bracket.  This
sequence may occur in inline assembler statements like

asm(
"ldr %[out], [%[in]]\n\t"
: [out] "=r" (ret)
: [in] "r" (addr)
);

Link: http://lkml.kernel.org/r/20180403191655.23700-1-xypron.glpk@gmx.de
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: add test for assignment at start of line
Joe Perches [Tue, 10 Apr 2018 23:34:04 +0000 (16:34 -0700)]
checkpatch: add test for assignment at start of line

Kernel style seems to prefer line wrapping an assignment with the
assignment operator on the previous line like:

<leading tabs> identifier =
expression;
over
<leading tabs> identifier
= expression;

somewhere around a 50:1 ratio

$ git grep -P "[^=]=\s*$" -- "*.[ch]" | wc -l
52008
$ git grep -P "^\s+[\*\/\+\|\%\-]?=[^=>]" | wc -l
1161

So add a --strict test for that condition.

Link: http://lkml.kernel.org/r/1522275726.2210.12.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: test SYMBOLIC_PERMS multiple times per line
Joe Perches [Tue, 10 Apr 2018 23:33:53 +0000 (16:33 -0700)]
checkpatch: test SYMBOLIC_PERMS multiple times per line

There are occasions where symbolic perms are used in a ternary like

return (channel == 0) ? S_IRUGO | S_IWUSR : S_IRUGO;

The current test will find the first use "S_IRUGO | S_IWUSR" but not the
second use "S_IRUGO" on the same line.

Improve the test to look for all instances on a line.

Link: http://lkml.kernel.org/r/1522127944.12357.49.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: two spelling fixes
Claudio Fontana [Tue, 10 Apr 2018 23:33:42 +0000 (16:33 -0700)]
checkpatch: two spelling fixes

completly -> completely
wacking -> whacking

Link: http://lkml.kernel.org/r/1520405394-5586-1-git-send-email-claudio.fontana@gliwa.com
Signed-off-by: Claudio Fontana <claudio.fontana@gliwa.com>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: improve get_quoted_string for TRACE_EVENT macros
Joe Perches [Tue, 10 Apr 2018 23:33:34 +0000 (16:33 -0700)]
checkpatch: improve get_quoted_string for TRACE_EVENT macros

The get_quoted_string function does not expect invalid arguments.

The $stat test can return non-statements for complicated macros like
TRACE_EVENT.

Allow the $stat block and test for vsprintf misuses to exceed the actual
block length and possibly test invalid lines by validating the arguments
of get_quoted_string.

Return "" if either get_quoted_string argument is undefined.

Miscellanea:

o Properly align the comment for the vsprintf extension test

Link: http://lkml.kernel.org/r/9e9725342ca3dfc0f5e3e0b8ca3c482b0e5712cc.1520356392.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: warn for use of %px
Tobin C. Harding [Tue, 10 Apr 2018 23:33:31 +0000 (16:33 -0700)]
checkpatch: warn for use of %px

Usage of the new %px specifier potentially leaks sensitive information.
Printing kernel addresses exposes the kernel layout in memory, this is
potentially exploitable.  We have tools in the kernel to help us do the
right thing.  We can have checkpatch warn developers of potential
dangers of using %px.

Have checkpatch emit a warning for usage of specifier %px.

Link: http://lkml.kernel.org/r/1519700648-23108-5-git-send-email-me@tobin.cc
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: add sub routine get_stat_here()
Tobin C. Harding [Tue, 10 Apr 2018 23:33:27 +0000 (16:33 -0700)]
checkpatch: add sub routine get_stat_here()

checkpatch currently contains duplicate code.  We can define a sub
routine and call that instead.  This reduces code duplication and line
count.

Add subroutine get_stat_here().

Link: http://lkml.kernel.org/r/1519700648-23108-4-git-send-email-me@tobin.cc
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: remove unused variable declarations
Tobin C. Harding [Tue, 10 Apr 2018 23:33:24 +0000 (16:33 -0700)]
checkpatch: remove unused variable declarations

Variables are declared and not used, we should remove them.

Link: http://lkml.kernel.org/r/1519700648-23108-3-git-send-email-me@tobin.cc
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: add sub routine get_stat_real()
Tobin C. Harding [Tue, 10 Apr 2018 23:33:20 +0000 (16:33 -0700)]
checkpatch: add sub routine get_stat_real()

checkpatch currently contains duplicate code.  We can define a sub
routine and call that instead.  This reduces code duplication and line
count.

Add subroutine get_stat_real()

Link: http://lkml.kernel.org/r/1519700648-23108-2-git-send-email-me@tobin.cc
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: add Crypto ON_STACK to declaration_macros
Gilad Ben-Yossef [Tue, 10 Apr 2018 23:33:17 +0000 (16:33 -0700)]
checkpatch: add Crypto ON_STACK to declaration_macros

Add the crypto API *_ON_STACK to $declaration_macros.

Resolves the following false warning:

WARNING: Missing a blank line after declarations
+ int err;
+ SHASH_DESC_ON_STACK(desc, ctx_p->shash_tfm);

Link: http://lkml.kernel.org/r/1518941636-4484-1-git-send-email-gilad@benyossef.com
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch.pl: add SPDX license tag check
Rob Herring [Tue, 10 Apr 2018 23:33:13 +0000 (16:33 -0700)]
checkpatch.pl: add SPDX license tag check

Add SPDX license tag check based on the rules defined in
Documentation/process/license-rules.rst.  To summarize, SPDX license
tags should be on the 1st line (or 2nd line in scripts) using the
appropriate comment style for the file type.

Link: http://lkml.kernel.org/r/20180202154026.15298-1-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Joe Perches <joe@perches.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agocheckpatch: improve parse_email signature checking
Joe Perches [Tue, 10 Apr 2018 23:33:09 +0000 (16:33 -0700)]
checkpatch: improve parse_email signature checking

Bare email addresses with non alphanumeric characters require escape
quoting before being substituted in the parse_email routine.

e.g. Reported-by: syzbot+bbd8e9a06452cc48059b@syzkaller.appspotmail.com

Do so.

Link: http://lkml.kernel.org/r/1518631805.3678.12.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agolib/list_debug.c: print unmangled addresses
Matthew Wilcox [Tue, 10 Apr 2018 23:33:06 +0000 (16:33 -0700)]
lib/list_debug.c: print unmangled addresses

The entire point of printing the pointers in list_debug is to see if
there's any useful information in them (eg poison values, ASCII, etc);
obscuring them to see if they compare equal makes them much less useful.
If an attacker can force this message to be printed, we've already lost.

Link: http://lkml.kernel.org/r/20180401223237.GV13332@bombadil.infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Tobin C. Harding <me@tobin.cc>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agolib/test_ubsan.c: make test_ubsan_misaligned_access() static
Colin Ian King [Tue, 10 Apr 2018 23:33:02 +0000 (16:33 -0700)]
lib/test_ubsan.c: make test_ubsan_misaligned_access() static

test_ubsan_misaligned_access() is local to the source and does not need
to be in global scope, so make it static.

Cleans up sparse warning:

  lib/test_ubsan.c:91:6: warning: symbol 'test_ubsan_misaligned_access' was not declared. Should it be static?

Link: http://lkml.kernel.org/r/20180313103048.28513-1-colin.king@canonical.com
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Cc: Jinbum Park <jinb.park7@gmail.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agolib: add testing module for UBSAN
Jinbum Park [Tue, 10 Apr 2018 23:32:58 +0000 (16:32 -0700)]
lib: add testing module for UBSAN

This is a test module for UBSAN.  It triggers all undefined behaviors
that linux supports now, and detect them.

All test-cases have passed by compiling with gcc-5.5.0.

If use gcc-4.9.x, misaligned, out-of-bounds, object-size-mismatch will not
be detected.  Because gcc-4.9.x doesn't support them.

Link: http://lkml.kernel.org/r/20180309102247.GA2944@pjb1027-Latitude-E5410
Signed-off-by: Jinbum Park <jinb.park7@gmail.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agolib/test_bitmap.c: do not accidentally use stack VLA
Kees Cook [Tue, 10 Apr 2018 23:32:54 +0000 (16:32 -0700)]
lib/test_bitmap.c: do not accidentally use stack VLA

This avoids an accidental stack VLA (since the compiler thinks the value
of "len" can change, even when marked "const").  This just replaces it
with a #define so it will DTRT.

Seen with -Wvla.  Fixed as part of the directive to remove all VLAs from
the kernel: https://lkml.org/lkml/2018/3/7/621

Link: http://lkml.kernel.org/r/20180307212555.GA17927@beast
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Yury Norov <ynorov@caviumnetworks.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agolib/Kconfig.debug: Debug Lockups and Hangs: keep SOFTLOCKUP options together
Randy Dunlap [Tue, 10 Apr 2018 23:32:51 +0000 (16:32 -0700)]
lib/Kconfig.debug: Debug Lockups and Hangs: keep SOFTLOCKUP options together

Keep all of the SOFTLOCKUP kconfig symbols together (instead of
injecting the HARDLOCKUP symbols in the midst of them) so that the
config tools display them with their dependencies.

Tested with 'make {menuconfig/nconfig/gconfig/xconfig}'.

Link: http://lkml.kernel.org/r/6be2d9ed-4656-5b94-460d-7f051e2c7570@infradead.org
Fixes: 05a4a9527931 ("kernel/watchdog: split up config options")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
6 years agoMAINTAINERS: update email address for Alexandre Bounine
Alexandre Bounine [Tue, 10 Apr 2018 23:32:48 +0000 (16:32 -0700)]
MAINTAINERS: update email address for Alexandre Bounine

Link: http://lkml.kernel.org/r/1522958149-6157-1-git-send-email-alex.bou9@gmail.com
Signed-off-by: Alexandre Bounine <alex.bou9@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Barry Wood <barry.wood@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>