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Christian Brauner [Tue, 2 Feb 2021 21:22:53 +0000 (22:22 +0100)]

cgroups: return ENOCGROUP2 from cgroup_attach()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 21:22:25 +0000 (22:22 +0100)]

cgroups: stricter argument vetting for cgroup_attach()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 21:21:38 +0000 (22:21 +0100)]

cgroups: move down cgroup_attach()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 21:15:43 +0000 (22:15 +0100)]

lxccontainer: use correct error checks

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 20:59:04 +0000 (21:59 +0100)]

cgroups: vet parameters

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 20:56:32 +0000 (21:56 +0100)]

cgroups: remove unused conf argument

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 18:29:41 +0000 (19:29 +0100)]

cgroups: rewind() file before polling again

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:31:52 +0000 (18:31 +0100)]

lxccontainer: use cgroup_freeze() and cgroup_unfreeze()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:55:39 +0000 (18:55 +0100)]

freezer: make methods return bool

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:27:12 +0000 (18:27 +0100)]

cgroups: add cgroup_freeze() and cgroup_unfreeze()

These are unified hierarchy only methods which don't need to initialize a full
cgroup driver. Instead, they rely on the command socket to retrieve a cgroup2
file descriptor to the container's cgroup.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:26:57 +0000 (18:26 +0100)]

freezer: use lxc_cmd_notify_state_listeners()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:26:29 +0000 (18:26 +0100)]

commands_utils: add lcx_cmd_notify_state_listeners()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:09:29 +0000 (18:09 +0100)]

cgroups: annotate cgroup_get()/cgroup_set()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:08:14 +0000 (18:08 +0100)]

cgroups: move functions after methods

This makes it more obvious that they are separate.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:03:41 +0000 (18:03 +0100)]

lxccontainer: use cgroup_set()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 17:02:47 +0000 (18:02 +0100)]

lxccontainer: use correct variable ordering

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 16:40:30 +0000 (17:40 +0100)]

cgroups: add croup_set()

This is a unified hierarchy only method which doesn't need to initialize a full
cgroup driver. Instead, it relies on the command socket to retrieve a cgroup2
file descriptor to the container's cgroup.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 16:40:08 +0000 (17:40 +0100)]

cgroups: reorder cgroup_get() arguments

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 16:00:49 +0000 (17:00 +0100)]

lxccontainer: use cgroup_get()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 15:59:38 +0000 (16:59 +0100)]

cgroups: add cgroup_get()

This is a unified hierarchy only method which doesn't need to initialize a full
cgroup driver. Instead, it relies on the command socket to retrieve a cgroup2
file descriptor to the container's cgroup.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 15:59:14 +0000 (16:59 +0100)]

file_utils: add lxc_read_try_buf_at()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 15:58:45 +0000 (16:58 +0100)]

macro: abuse ENOMEDIUM as ENOCGROUP2

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Stéphane Graber [Tue, 2 Feb 2021 14:28:50 +0000 (09:28 -0500)]

Merge pull request #3646 from brauner/2021-02-02/fixes

attach & cgroup hardening

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Christian Brauner [Tue, 2 Feb 2021 12:47:40 +0000 (13:47 +0100)]

cgroups: switch controller delegation to fd-only operations

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 12:46:03 +0000 (13:46 +0100)]

cgroups: add unified_cgroup_fd() helper

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 12:45:26 +0000 (13:45 +0100)]

file_utils: harden lxc_writeat()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 12:45:11 +0000 (13:45 +0100)]

file_utils: harden lxc_open_dirfd()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 12:44:37 +0000 (13:44 +0100)]

syscall_wrappers: add PROTECT_OPEN_W_* variants

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 12:44:13 +0000 (13:44 +0100)]

memory_utils: add close_prot_errno_mov()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 09:43:12 +0000 (10:43 +0100)]

attach: move loading seccomp as late as possible

We want to minimize the change that the profile blocks syscalls we need during
attach setup and has the notifier enabled.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 09:26:21 +0000 (10:26 +0100)]

attach: move file descriptor closing into attach_context_container()

This reduces the possibility of forgetting to close the namespace file
descriptors when we change this codepath.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Tue, 2 Feb 2021 08:54:10 +0000 (09:54 +0100)]

attach: stricter lookup semantics for fdopen_at() calls

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Stéphane Graber [Mon, 1 Feb 2021 22:13:37 +0000 (17:13 -0500)]

Merge pull request #3645 from brauner/2021-02-01/fixes_4

attach: bugfixes

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Christian Brauner [Mon, 1 Feb 2021 21:54:47 +0000 (22:54 +0100)]

confile_utils: use lxc_log_trace()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 21:53:56 +0000 (22:53 +0100)]

conf: use lxc_log_trace()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 21:34:33 +0000 (22:34 +0100)]

commands_utils: don't leak memory

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 21:13:03 +0000 (22:13 +0100)]

attach: use correct put method

Fixes: Coverity 1472763
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 21:11:38 +0000 (22:11 +0100)]

attach: prevent UAF

Fixes: Coverity 1472761
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Stéphane Graber [Mon, 1 Feb 2021 20:26:08 +0000 (15:26 -0500)]

Merge pull request #3644 from brauner/2021-02-01/fixes_3

attach: harden open() calls

commit | commitdiff | tree

Christian Brauner [Mon, 1 Feb 2021 19:25:51 +0000 (20:25 +0100)]

attach: file descriptor based fdinfo handling

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 19:17:16 +0000 (20:17 +0100)]

file_utils: remove O_NOFOLLOW from open_at() defaults

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Mon, 1 Feb 2021 19:15:16 +0000 (20:15 +0100)]

lsm: harden read_file_at()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Mon, 1 Feb 2021 19:12:03 +0000 (20:12 +0100)]

tree-wide: extend read_file_at()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 19:03:29 +0000 (20:03 +0100)]

attach: harden open calls

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 16:08:06 +0000 (17:08 +0100)]

syscall_wrappers: add PROTECT_LOOKUP, PROTECT_OPEN, PROTECT_LOOKUP_WITH_SYMLINKS, PROTECT_OPEN_WITH_TRAILING_SYMLINKS

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Mon, 1 Feb 2021 16:03:59 +0000 (17:03 +0100)]

file_utils: add open_at()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Stéphane Graber [Mon, 1 Feb 2021 15:17:18 +0000 (10:17 -0500)]

Merge pull request #3642 from brauner/2021-02-01/fixes

attach: rework id handling

commit | commitdiff | tree

Stéphane Graber [Mon, 1 Feb 2021 15:14:49 +0000 (10:14 -0500)]

Merge pull request #3643 from brauner/2021-02-01/fixes_2

cgroups: remove pointless NULL checks

commit | commitdiff | tree

Christian Brauner [Mon, 1 Feb 2021 14:44:59 +0000 (15:44 +0100)]

cgroups: initialize variable

Fixes: Coverity 1472651
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 14:20:43 +0000 (15:20 +0100)]

cgroups: remove pointless NULL checks

We're already ensuring before that conf isn't NULL.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 14:16:56 +0000 (15:16 +0100)]

attach: stash host uid and host gid in attach_context

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 13:51:41 +0000 (14:51 +0100)]

attach: fix error checking for dup2()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 13:50:55 +0000 (14:50 +0100)]

attach: fix logging for stdfd replacement

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 13:44:45 +0000 (14:44 +0100)]

attach: log failues to dup2() with SYSDEBUG()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 13:35:42 +0000 (14:35 +0100)]

utils: use SYSTRACE() when logging stdio permission fixup failures

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 11:23:43 +0000 (12:23 +0100)]

attach: document attach_context

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 11:23:26 +0000 (12:23 +0100)]

attach: simplify opening of /proc/self

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Mon, 1 Feb 2021 11:22:42 +0000 (12:22 +0100)]

attach: move uid and gid handling to get_attach_context()

the less we do in do_attach(), the better.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Mon, 1 Feb 2021 10:43:47 +0000 (11:43 +0100)]

attach: initialize init_pid field to -ESRCH

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Mon, 1 Feb 2021 10:37:22 +0000 (11:37 +0100)]

attach: unifiy /proc/<init-pid>/status parsing

and move it out of do_attach(). The less we do in the container's context the
better.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Mon, 1 Feb 2021 10:11:15 +0000 (11:11 +0100)]

file_utils: add fdopenat()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Stéphane Graber [Sun, 31 Jan 2021 22:13:25 +0000 (17:13 -0500)]

Merge pull request #3641 from brauner/2021-01-30/fixes

attach: pidfd-based hardening and file-descriptor-only LSM interactions

commit | commitdiff | tree

Christian Brauner [Sun, 31 Jan 2021 20:48:00 +0000 (21:48 +0100)]

lsm/apparmor: cleanup apparmor_process_label_set()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sun, 31 Jan 2021 19:44:09 +0000 (20:44 +0100)]

attach: hardening through use of pidfds

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sun, 31 Jan 2021 18:26:53 +0000 (19:26 +0100)]

attach: file descriptors based LSM handling

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 20:54:45 +0000 (21:54 +0100)]

cgroups: align methods

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Stéphane Graber [Sat, 30 Jan 2021 19:23:25 +0000 (14:23 -0500)]

Merge pull request #3639 from brauner/2021-01-28/fixes

cgroups: fixes and improvements

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 16:28:32 +0000 (17:28 +0100)]

cgroups: use PTR_TO_U64()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 16:07:55 +0000 (17:07 +0100)]

attach: don't needless check for NULL

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 11:17:08 +0000 (12:17 +0100)]

log: add lxc_log_trace() helper

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 11:15:31 +0000 (12:15 +0100)]

cgroups: use bpf log when logging at trace level

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 11:10:21 +0000 (12:10 +0100)]

seccomp: use lxc_log_get_level()

This will now enable LXD users to dump the seccomp filter in the log when
logging at TRACE level.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 11:10:09 +0000 (12:10 +0100)]

log: rework lxc_log_get_level()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 11:00:28 +0000 (12:00 +0100)]

cgroups: use cleanup macro for consistency

and to prevent future mishaps.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Sat, 30 Jan 2021 10:25:45 +0000 (11:25 +0100)]

cgroups: vet parameters more strictly

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 10:09:45 +0000 (11:09 +0100)]

seccomp: use lxc_log_get_fd()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 10:07:43 +0000 (11:07 +0100)]

log: add lxc_log_get_fd()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 10:02:10 +0000 (11:02 +0100)]

log: remove pointless inline

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Sat, 30 Jan 2021 01:14:00 +0000 (02:14 +0100)]

cgroups: tweak cgroup initialization

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Sat, 30 Jan 2021 01:07:36 +0000 (02:07 +0100)]

cgroups: use zalloc

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Sat, 30 Jan 2021 01:07:21 +0000 (02:07 +0100)]

cgroups: ensure all memory is zeroed

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Sat, 30 Jan 2021 01:07:00 +0000 (02:07 +0100)]

cgroups: don't initiliaze NULL log

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

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Christian Brauner [Sat, 30 Jan 2021 00:10:49 +0000 (01:10 +0100)]

cgroups: coding style fixes

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 23:55:19 +0000 (00:55 +0100)]

croups: improve __do_bpf_program_free

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 23:17:14 +0000 (00:17 +0100)]

cgroups: bpf fixes

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Stéphane Graber [Sat, 30 Jan 2021 00:58:40 +0000 (19:58 -0500)]

Merge pull request #3638 from brauner/2021-01-28/fixes

attach: improve attach codepaths

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 15:36:52 +0000 (16:36 +0100)]

attach: init file descriptors to -EBADF

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 14:13:51 +0000 (15:13 +0100)]

attach: move to file descriptor only namespace interactions

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 13:52:21 +0000 (14:52 +0100)]

attach: move to file descriptor-only interactions

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 13:32:17 +0000 (14:32 +0100)]

attach: rework attaching to namespace fds

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 13:27:07 +0000 (14:27 +0100)]

attach: remove unneeded assignment

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 13:26:15 +0000 (14:26 +0100)]

attach: use STDIN_FILENO instead of hard-coding 0

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 13:24:31 +0000 (14:24 +0100)]

attach: move new_cwd into tighter scope

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 13:13:37 +0000 (14:13 +0100)]

attach: use dummy macros to make it easier to follow sync logic

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 13:06:53 +0000 (14:06 +0100)]

attach: introduce sync_wait_fd() and sync_wake_fd()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 13:01:59 +0000 (14:01 +0100)]

sync: make all sync helpers return bool

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 12:51:45 +0000 (13:51 +0100)]

attach: introduce sync_wait_pid() and sync_wake_pid()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 12:42:47 +0000 (13:42 +0100)]

attach: use sync_wait()/sync_wake() where applicable

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 12:31:57 +0000 (13:31 +0100)]

sync: rename startup synchronization macros

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commit | commitdiff | tree

Christian Brauner [Fri, 29 Jan 2021 12:28:23 +0000 (13:28 +0100)]

sync: export sync_wait() and sync_wake()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>