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| author | Ondrej Mosnacek <omosnace@redhat.com> | 2023-07-18 13:56:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-11 11:57:31 +0200 |
| commit | 22786d53817d1452f30373807f8202bb9bf43732 (patch) | |
| tree | 6d188e204c09699bbedc9c581fb217caa15c6a96 /io_uring | |
| parent | 8e635da0e0d3cb45e32fa79b36218fb98281bc10 (diff) | |
| download | linux-stable-22786d53817d1452f30373807f8202bb9bf43732.tar.gz linux-stable-22786d53817d1452f30373807f8202bb9bf43732.tar.bz2 linux-stable-22786d53817d1452f30373807f8202bb9bf43732.zip | |
io_uring: don't audit the capability check in io_uring_create()
[ Upstream commit 6adc2272aaaf84f34b652cf77f770c6fcc4b8336 ]
The check being unconditional may lead to unwanted denials reported by
LSMs when a process has the capability granted by DAC, but denied by an
LSM. In the case of SELinux such denials are a problem, since they can't
be effectively filtered out via the policy and when not silenced, they
produce noise that may hide a true problem or an attack.
Since not having the capability merely means that the created io_uring
context will be accounted against the current user's RLIMIT_MEMLOCK
limit, we can disable auditing of denials for this check by using
ns_capable_noaudit() instead of capable().
Fixes: 2b188cc1bb85 ("Add io_uring IO interface")
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2193317
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Link: https://lore.kernel.org/r/20230718115607.65652-1-omosnace@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/io_uring.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 51e6ebe72caf..f84584b762d0 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -10431,7 +10431,7 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p, if (!ctx) return -ENOMEM; ctx->compat = in_compat_syscall(); - if (!capable(CAP_IPC_LOCK)) + if (!ns_capable_noaudit(&init_user_ns, CAP_IPC_LOCK)) ctx->user = get_uid(current_user()); /* |