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| author | Max Kellermann <max.kellermann@ionos.com> | 2026-08-24 18:47:07 +0200 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2026-09-02 12:22:03 +0200 |
| commit | a61c6ae1dae2611082b831b4aaa780878099c012 (patch) | |
| tree | c3c95f345898f823b83e02671775a13c4341370d /scripts/Makefile.thinlto | |
| parent | cee9395acd8043be0644b25c34bfa86623f2b935 (diff) | |
| download | linux-a61c6ae1dae2611082b831b4aaa780878099c012.tar.gz linux-a61c6ae1dae2611082b831b4aaa780878099c012.zip | |
ceph: lock mutex in ceph_mds_check_access()
MDS session OPEN handling replaces mdsc->s_cap_auths under
mdsc->mutex, freeing the previous array and its strings.
ceph_mds_check_access() traverses this array without holding the
mutex. A concurrent session reopen can therefore free the array while
it is being inspected, resulting in a use-after-free like this:
Unable to handle kernel paging request at virtual address 003aaad64b2c8bb9
[...]
Internal error: Oops: 0000000096000004 [#1] SMP
Modules linked in:
CPU: 56 UID: 2953037534 PID: 1253231 Comm: php-cgi8.4 Not tainted 6.18.45-i2-ampere #1146 NONE
[..]
pc : ceph_mds_check_access+0xd4/0x550
lr : ceph_mds_check_access+0xc8/0x550
[...]
Call trace:
ceph_mds_check_access+0xd4/0x550 (P)
ceph_atomic_open+0x138/0xbe8
path_openat+0xa24/0xfa8
do_filp_open+0x94/0x158
do_sys_openat2+0x88/0xf8
Cc: stable@vger.kernel.org
Fixes: 596afb0b8933 ("ceph: add ceph_mds_check_access() helper")
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Reviewed-by: Alex Markuze <amarkuze@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'scripts/Makefile.thinlto')
0 files changed, 0 insertions, 0 deletions