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git.proxmox.com Git - mirror_lxc.git/log
Christian Brauner [Wed, 24 Feb 2021 14:31:12 +0000 (15:31 +0100)]
commands: extend rsp_one_fd() to also handle additional data
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 14:25:19 +0000 (15:25 +0100)]
file_utils: actually open the file for reading
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 10:53:53 +0000 (11:53 +0100)]
commands: set rsp.ret to 0 for lxc_cmd_get_cgroup_ctx_callback()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 10:31:02 +0000 (11:31 +0100)]
cgroups: s/cgroup_layout/layout/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 10:11:08 +0000 (11:11 +0100)]
commands: add LXC_CMD_GET_CGROUP_FD and LXC_CMD_GET_LIMIT_CGROUP_FD
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 09:58:43 +0000 (10:58 +0100)]
commands: s/_LIMITING_/_LIMIT_/g and s/_limiting_/_limit_/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 08:47:40 +0000 (09:47 +0100)]
commands: simplify lxc_cmd_get_cgroup_ctx()
Instead of allowing individual hierarchy fd retrieval through
lxc_cmd_get_cgroup_ctx() let's add a dedicated method instead.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 08:46:07 +0000 (09:46 +0100)]
commands: fix alignment for lxc_cmd_get_cgroup_ctx()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 08:41:32 +0000 (09:41 +0100)]
cgroups: handle fallback gracefully
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 08:37:13 +0000 (09:37 +0100)]
cgroups: make use of ERRNO_IS_NOT_SUPPORTED()
This will hopefully prevent backwards compatibility fallback errors.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 08:19:12 +0000 (09:19 +0100)]
error_utils: copy over Lennart's IN_SET()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 08:17:03 +0000 (09:17 +0100)]
commands: tweak return values
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 08:16:09 +0000 (09:16 +0100)]
error_utils: move error helper to separate header
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 07:58:56 +0000 (08:58 +0100)]
cgroups: simple variable reordering
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Stéphane Graber [Wed, 24 Feb 2021 01:17:52 +0000 (20:17 -0500)]
Merge pull request #3692 from brauner/2021-02-23/fixes
build fix & cgroup braino
Christian Brauner [Wed, 24 Feb 2021 00:53:05 +0000 (01:53 +0100)]
attach: be paranoid about file descriptors
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 00:26:22 +0000 (01:26 +0100)]
cgroups: fix braino during controller list creation
Co-mounted controllers are conventionally separated by ",".
Fixes: https://jenkins.linuxcontainers.org/job/lxd-github-commit/1905/arch=amd64,backend=dir,compiler=golang-1.15/consoleFull
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Wed, 24 Feb 2021 00:01:17 +0000 (01:01 +0100)]
commands: remove faulty use of access attribute
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Stéphane Graber [Tue, 23 Feb 2021 21:53:23 +0000 (16:53 -0500)]
Merge pull request #3691 from brauner/2021-02-23/fixes
Fix issues reported by Coverity
Christian Brauner [Tue, 23 Feb 2021 21:10:56 +0000 (22:10 +0100)]
cgroups: fix error checking
Fixes: Coverity 1473310
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 21:08:48 +0000 (22:08 +0100)]
af_unix: prevent oob writes
Fixes: Coverity 1473309
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 21:07:11 +0000 (22:07 +0100)]
commands: only deref once
Fixes: Coverity 1473308
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Stéphane Graber [Tue, 23 Feb 2021 20:49:38 +0000 (15:49 -0500)]
Merge pull request #3690 from brauner/2021-02-21/fixes
attach: improve attaching of new clients to old servers
Christian Brauner [Tue, 23 Feb 2021 20:06:56 +0000 (21:06 +0100)]
commands: handle old clients for LXC_CMD_GET_CGROUP_CTX
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 20:04:41 +0000 (21:04 +0100)]
attach: handle new and old clients
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 20:00:22 +0000 (21:00 +0100)]
attach: make fd sending more uniform
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 19:48:53 +0000 (20:48 +0100)]
terminal: dumb logging down
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Stéphane Graber [Tue, 23 Feb 2021 20:08:04 +0000 (15:08 -0500)]
Merge pull request #3689 from brauner/2021-02-21/fixes
cgroups: introduce fd-only cgroup attach via LXC_CMD_GET_CGROUP_CTX
Christian Brauner [Tue, 23 Feb 2021 19:13:29 +0000 (20:13 +0100)]
attach: fix namespace preservation
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 18:31:29 +0000 (19:31 +0100)]
commands: verify expected file descriptors were sent
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 18:10:38 +0000 (19:10 +0100)]
commands: handle older clients gracefully
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 18:05:09 +0000 (19:05 +0100)]
attach: remove additional newline
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 18:00:42 +0000 (19:00 +0100)]
af_unix: add comment about cast
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 17:59:07 +0000 (18:59 +0100)]
attach: fix unsupported namespaces
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 15:21:55 +0000 (16:21 +0100)]
commands: lxc_cmd_add_state_client_callback()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 14:06:33 +0000 (15:06 +0100)]
commands: handle older clients elegantly
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 13:22:22 +0000 (14:22 +0100)]
commands: send ENOSYS response
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 13:01:59 +0000 (14:01 +0100)]
cgroups: introduce fd-only cgroup attach
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 13:00:54 +0000 (14:00 +0100)]
commands: introduce LXC_CMD_GET_CGROUP_CTX
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 12:58:39 +0000 (13:58 +0100)]
utils: add copy_struct_to_client()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 12:58:13 +0000 (13:58 +0100)]
log: add syswarn_set()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 07:45:32 +0000 (08:45 +0100)]
utils: add copy_struct_from_client()
Which is our variant of copy_struct_from_user() that Aleksa and I added to the
kernel.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Tue, 23 Feb 2021 07:45:21 +0000 (08:45 +0100)]
macro: add min() macro
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 21:45:36 +0000 (22:45 +0100)]
cgroups: allow cgroup fd batch retrieval
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 19:00:18 +0000 (20:00 +0100)]
commands: add LXC_CMD_GET_CGROUP_FD
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 20:53:06 +0000 (21:53 +0100)]
commands: introduce rsp_many_fds()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 20:51:19 +0000 (21:51 +0100)]
commands: introduce rsp_one_fd()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 18:01:45 +0000 (19:01 +0100)]
commands: introduce lxc_cmd_rsp_send_reap()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 17:24:49 +0000 (18:24 +0100)]
commands: be more explicit during command processing
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 14:28:07 +0000 (15:28 +0100)]
state: _never_ return NULL from lxc_state2str()
Cc: Thomas Parrott <thomas.parrott@canonical.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 12:00:16 +0000 (13:00 +0100)]
cgroups: add cgroup_fds() helper
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 11:39:13 +0000 (12:39 +0100)]
af_unix: improve SCM_RIGHTS file descriptor retrieval
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 11:25:52 +0000 (12:25 +0100)]
commands: tweak validate_string_request()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Mon, 22 Feb 2021 11:12:32 +0000 (12:12 +0100)]
commands: explicitly number enums
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 19:03:45 +0000 (20:03 +0100)]
cgroups: close dfd_mon but keep dfd_con and dfd_lim open for all cgroup hierarchies
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 18:59:25 +0000 (19:59 +0100)]
cgroups: start stashing all fds
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 18:57:31 +0000 (19:57 +0100)]
cgroups: skip and warn about invalid file descriptors
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 18:48:11 +0000 (19:48 +0100)]
memory_utils: fix close_equal()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Stéphane Graber [Mon, 22 Feb 2021 19:52:25 +0000 (14:52 -0500)]
Merge pull request #3688 from brauner/2021-02-19/fixes_2
cgroups: rework cgroup initialization
Christian Brauner [Sun, 21 Feb 2021 10:36:06 +0000 (11:36 +0100)]
cgroups: handle lxc.cgroup.use global parameter
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:30:46 +0000 (11:30 +0100)]
cgroups: fix cg_legacy_freeze() return type
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:28:31 +0000 (11:28 +0100)]
file_utils: tweak lxc_write_openat()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 13:32:56 +0000 (14:32 +0100)]
cgroups: improve utility controller handling
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 13:18:28 +0000 (14:18 +0100)]
cgroups: s/cgroup2_chown/delegate/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:22:59 +0000 (11:22 +0100)]
cgroups: move cgroup2 parameters into substruct
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:18:29 +0000 (11:18 +0100)]
cgroups: s/container_limit_path/path_lim/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:17:54 +0000 (11:17 +0100)]
cgroups: s/container_full_path/path_con/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:16:30 +0000 (11:16 +0100)]
cgroups: s/cgfd_limit/dfd_lim/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:15:37 +0000 (11:15 +0100)]
cgroups: s/cgfd_mon/dfd_mon/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:14:53 +0000 (11:14 +0100)]
cgroups: s/cgfd_con/dfd_con/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:11:37 +0000 (11:11 +0100)]
cgroups: s/mountpoint/at_mnt/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 10:09:27 +0000 (11:09 +0100)]
cgroups: s/container_base_path/at_base/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 09:54:23 +0000 (10:54 +0100)]
cgroups: rename cgroupfs mount fd
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 00:40:11 +0000 (01:40 +0100)]
cgroups: simplify and fix mounting on non-cgroup namespace aware kernels
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 00:28:45 +0000 (01:28 +0100)]
cgroups: introduce cgroup hierarchy type
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 00:25:49 +0000 (01:25 +0100)]
cgroups: remove unused helpers
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 00:09:33 +0000 (01:09 +0100)]
cgroups: s/add_hierarchy()/cgroup_hierarchy_add()/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sun, 21 Feb 2021 00:05:39 +0000 (01:05 +0100)]
cgroups: split delegation checks into separate helpers
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sat, 20 Feb 2021 23:46:23 +0000 (00:46 +0100)]
cgroups: simplify string list handling
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sat, 20 Feb 2021 01:01:18 +0000 (02:01 +0100)]
cgroups: rework cgroup initialization
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sat, 20 Feb 2021 00:31:05 +0000 (01:31 +0100)]
cgroups: split out unified cgroup helpers
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sat, 20 Feb 2021 02:17:10 +0000 (03:17 +0100)]
memory_utils: adapt to new pointer error macros
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sat, 20 Feb 2021 00:30:33 +0000 (01:30 +0100)]
macro: add pointer error encoding support
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sat, 20 Feb 2021 00:32:49 +0000 (01:32 +0100)]
compiler: add likely() and unlikely() support
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sat, 20 Feb 2021 00:10:53 +0000 (01:10 +0100)]
cgroups: s/basecginfo/cgroup_info/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Sat, 20 Feb 2021 00:07:43 +0000 (01:07 +0100)]
cgroups: simplify current cgroup retrieval on pure unified cgroup layouts
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 23:49:25 +0000 (00:49 +0100)]
cgroups: tweak return values
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 23:42:51 +0000 (00:42 +0100)]
cgroups: tweak lxc.cgroup.use handling in __cgroup_init()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 23:39:47 +0000 (00:39 +0100)]
cgroups: s/must_copy_string()/strdup()/g
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 23:38:57 +0000 (00:38 +0100)]
cgroups: avoid additional variable for single access
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 17:25:30 +0000 (18:25 +0100)]
cgroups: fix prune_init_scope()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 16:39:09 +0000 (17:39 +0100)]
string_utils: move lxc_iterate_parts()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Stéphane Graber [Fri, 19 Feb 2021 17:04:56 +0000 (12:04 -0500)]
Merge pull request #3684 from brauner/2021-02-18/fixes_2
bpf: device cgroup improvements
Stéphane Graber [Fri, 19 Feb 2021 16:58:43 +0000 (11:58 -0500)]
Merge pull request #3687 from brauner/2021-02-19/fixes
lsm: fixes
Christian Brauner [Fri, 19 Feb 2021 12:50:35 +0000 (13:50 +0100)]
doc: tweak cgroup headline
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 12:41:51 +0000 (13:41 +0100)]
doc: epxlain eBPF-based device controller semantics
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 12:39:42 +0000 (13:39 +0100)]
doc: add missing ".[controller file] suffix to lxc.cgroup{2}. key explanations
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 10:50:29 +0000 (11:50 +0100)]
bpf: update device cgroup semantics
LXC has supported the bpf device controlller for a while now. A bpf device
program can be attached to the container's cgroup if this is a pure cgroup2
host.
The format for specifying device rules for the cgroup2 bpf device controller is
the same as for the legacy cgroup device controller; only the configuration key
prefix has to change. Specifically, device rules for the legacy cgroup device
controller are specified by via lxc.cgroup.devices.{allow,deny} whereas for the
cgroup2 bpf device controller lxc.cgroup2.devices.{allow,deny} must be used.
The following semantics apply:
1. The device rule "lxc.cgroup2.devices.deny = a" will cause LXC to instruct
the kernel to block access to all devices by default. To grant access to
devices "allow device rules" must be added via the
"lxc.cgroup2.devices.allow" key. This is referred to as a "allowlist" device
program.
2. The device rule "lxc.cgroup2.devices.allow = a" will cause LXC to instruct
the kernel to allow access to all devices by default. To deny access to
devices "deny device rules" must be added via "lxc.cgroup2.devices.deny"
key. This is referred to as a "denylist" device program.
3. Specifying a rule as explained in 1. or 2. will cause all previous rules to
be cleared, i.e. the device list will be reset.
For example the set of rules:
lxc.cgroup2.devices.deny = a
lxc.cgroup2.devices.allow = c *:* m
lxc.cgroup2.devices.allow = b *:* m
lxc.cgroup2.devices.allow = c 1:3 rwm
implements a "allowlist" device program, i.e. the kernel will block access to
all devices not specifically allowed in this list. This particular program
states that all character and block devices might be created but only /dev/null
might be read or written.
If we to switch to the set of rules to:
lxc.cgroup2.devices.allow = a
lxc.cgroup2.devices.deny = c *:* m
lxc.cgroup2.devices.deny = b *:* m
lxc.cgroup2.devices.deny = c 1:3 rwm
then LXC would instruct the kernel to implement a "denylist", i.e. the kernel
will allow access to all devices not specifically denied in this list. This
particular program states that no character devices or block devices might be
created and that /dev/null is not allow allowed to be read, written, or
created.
Consider the same program but followed by a rule as explained in 1. or 2.:
lxc.cgroup2.devices.allow = a
lxc.cgroup2.devices.deny = c *:* m
lxc.cgroup2.devices.deny = b *:* m
lxc.cgroup2.devices.deny = c 1:3 rwm
lxc.cgroup2.devices.allow = a
The last line will cause LXC to reset the device list without changing the type
of device program.
lxc.cgroup2.devices.allow = a
lxc.cgroup2.devices.deny = c *:* m
lxc.cgroup2.devices.deny = b *:* m
lxc.cgroup2.devices.deny = c 1:3 rwm
lxc.cgroup2.devices.deny = a
The last line will cause LXC to reset the device list and switch from a
"allowlist" program to a "denylist" program.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 10:31:20 +0000 (11:31 +0100)]
cgroups: tweak bpf_device_cgroup_prepare()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Christian Brauner [Fri, 19 Feb 2021 10:24:49 +0000 (11:24 +0100)]
conf: expose lxc_clear_cgroup2_devices()
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>