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| author |   Waiman Long <longman@redhat.com> | 2024-07-03 14:52:29 -0400 |
|---|---|---|
| committer |   Tejun Heo <tj@kernel.org> | 2024-07-03 08:59:06 -1000 |
| commit | 57b56d16800e8961278ecff0dc755d46c4575092 (patch) | |
| tree | dabcc5b7330e058dde3a294fb557e08b1e14f634 /scripts/gdb/linux/utils.py | |
| parent | cgroup/cpuset: Prevent UAF in proc_cpuset_show() (diff) | |
| download | wireguard-linux-57b56d16800e8961278ecff0dc755d46c4575092.tar.xz wireguard-linux-57b56d16800e8961278ecff0dc755d46c4575092.zip | |
cgroup: Protect css->cgroup write under css_set_lock
The writing of css->cgroup associated with the cgroup root in
rebind_subsystems() is currently protected only by cgroup_mutex.
However, the reading of css->cgroup in both proc_cpuset_show() and
proc_cgroup_show() is protected just by css_set_lock. That makes the
readers susceptible to racing problems like data tearing or caching.
It is also a problem that can be reported by KCSAN.
This can be fixed by using READ_ONCE() and WRITE_ONCE() to access
css->cgroup. Alternatively, the writing of css->cgroup can be moved
under css_set_lock as well which is done by this patch.
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'scripts/gdb/linux/utils.py')
0 files changed, 0 insertions, 0 deletions