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Revert "kernel/kcmp.c: Use new infrastructure to fix deadlocks in execve"

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This reverts commit 0cd9783686 which is
commit 454e3126cb842388e22df6b3ac3da44062c00765 upstream.

It breaks the API and we don't need it right now in the 5.4 tree.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I2a8282c4bc97e97debad023bf098dd97fd02b072
This commit is contained in:
Greg Kroah-Hartman 2020-10-01 18:32:40 +02:00
parent 5bf86c2bf5
commit 70187595b8
1 changed files with 4 additions and 4 deletions
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8
kernel/kcmp.c
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@ -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->exec_update_mutex,
&task2->signal->exec_update_mutex);
ret = kcmp_lock(&task1->signal->cred_guard_mutex,
&task2->signal->cred_guard_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->exec_update_mutex,
&task2->signal->exec_update_mutex);
kcmp_unlock(&task1->signal->cred_guard_mutex,
&task2->signal->cred_guard_mutex);
err:
put_task_struct(task1);
put_task_struct(task2);