Description
In the Linux kernel, the following vulnerability has been resolved: kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths The usage of task_lock(tsk->group_leader) in sys_prlimit64()->do_prlimit() path is very broken. sys_prlimit64() does get_task_struct(tsk) but this only protects task_struct itself. If tsk != current and tsk is not a leader, this process can exit/exec and task_lock(tsk->group_leader) may use the already freed task_struct. Another problem is that sys_prlimit64() can race with mt-exec which changes ->group_leader. In this case do_prlimit() may take the wrong lock, or (worse) ->group_leader may change between task_lock() and task_unlock(). Change sys_prlimit64() to take tasklist_lock when necessary. This is not nice, but I don't see a better fix for -stable.
Product status
18c91bb2d87268d23868bf13508f5bc9cf04e89a (git) before 1bc0d9315ef5296abb2c9fd840336255850ded18
18c91bb2d87268d23868bf13508f5bc9cf04e89a (git) before 132f827e7bac7373e1522e89709d70b43cae5342
18c91bb2d87268d23868bf13508f5bc9cf04e89a (git) before 19b45c84bd9fd42fa97ff80c6350d604cb871c75
18c91bb2d87268d23868bf13508f5bc9cf04e89a (git) before 6796412decd2d8de8ec708213bbc958fab72f143
18c91bb2d87268d23868bf13508f5bc9cf04e89a (git) before a15f37a40145c986cdf289a4b88390f35efdecc4
5.18
Any version before 5.18
6.1.157 (semver)
6.6.113 (semver)
6.12.54 (semver)
6.17.4 (semver)
6.18 (original_commit_for_fix)
References
git.kernel.org/...c/1bc0d9315ef5296abb2c9fd840336255850ded18
git.kernel.org/...c/132f827e7bac7373e1522e89709d70b43cae5342
git.kernel.org/...c/19b45c84bd9fd42fa97ff80c6350d604cb871c75
git.kernel.org/...c/6796412decd2d8de8ec708213bbc958fab72f143
git.kernel.org/...c/a15f37a40145c986cdf289a4b88390f35efdecc4
