diff options
| author | Bernd Edlinger <bernd.edlinger@hotmail.de> | 2020-03-20 23:27:05 +0300 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2020-03-25 18:04:01 +0300 |
| commit | 454e3126cb842388e22df6b3ac3da44062c00765 (patch) | |
| tree | 7ef34345010c219f5e5fd81bfa31d0b9a5e4b00b | |
| parent | aa884c11313656fee7b12972614b6333f154655c (diff) | |
| download | linux-454e3126cb842388e22df6b3ac3da44062c00765.tar.xz | |
kernel/kcmp.c: Use new infrastructure to fix deadlocks in execve
This changes kcmp_epoll_target to use the new exec_update_mutex
instead of cred_guard_mutex.
This should be safe, as the credentials are only used for reading,
and furthermore ->mm and ->sighand are updated on execve,
but only under the new exec_update_mutex.
Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
| -rw-r--r-- | kernel/kcmp.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/kcmp.c b/kernel/kcmp.c index a0e3d7a0e8b8..b3ff9288c6cc 100644 --- a/kernel/kcmp.c +++ b/kernel/kcmp.c @@ -173,8 +173,8 @@ SYSCALL_DEFINE5(kcmp, pid_t, pid1, pid_t, pid2, int, type, /* * One should have enough rights to inspect task details. */ - ret = kcmp_lock(&task1->signal->cred_guard_mutex, - &task2->signal->cred_guard_mutex); + ret = kcmp_lock(&task1->signal->exec_update_mutex, + &task2->signal->exec_update_mutex); if (ret) goto err; if (!ptrace_may_access(task1, PTRACE_MODE_READ_REALCREDS) || @@ -229,8 +229,8 @@ SYSCALL_DEFINE5(kcmp, pid_t, pid1, pid_t, pid2, int, type, } err_unlock: - kcmp_unlock(&task1->signal->cred_guard_mutex, - &task2->signal->cred_guard_mutex); + kcmp_unlock(&task1->signal->exec_update_mutex, + &task2->signal->exec_update_mutex); err: put_task_struct(task1); put_task_struct(task2); |