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Revert "proc: Use new infrastructure to fix deadlocks in execve"

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This reverts commit 4301db49e5 which is
commit 2db9dbf71bf98d02a0bf33e798e5bfd2a9944696 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: I77034b08efcd2ce56c4e19bad07c335db20bf31f
This commit is contained in:
Greg Kroah-Hartman 2020-10-01 20:27:50 +02:00
commit 5bf86c2bf5
1 changed files with 3 additions and 3 deletions
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6
fs/proc/base.c
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@ -404,11 +404,11 @@ print0:
static int lock_trace(struct task_struct *task)
{
int err = mutex_lock_killable(&task->signal->exec_update_mutex);
int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
if (err)
return err;
if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) {
mutex_unlock(&task->signal->exec_update_mutex);
mutex_unlock(&task->signal->cred_guard_mutex);
return -EPERM;
}
return 0;
@ -416,7 +416,7 @@ static int lock_trace(struct task_struct *task)
static void unlock_trace(struct task_struct *task)
{
mutex_unlock(&task->signal->exec_update_mutex);
mutex_unlock(&task->signal->cred_guard_mutex);
}
#ifdef CONFIG_STACKTRACE