From 501f9328bf5c6b5e4863da4b50e0e86792de3aa9 Mon Sep 17 00:00:00 2001 From: Bernd Edlinger Date: Sat, 21 Mar 2020 02:46:16 +0000 Subject: [PATCH] pidfd: Use new infrastructure to fix deadlocks in execve This changes __pidfd_fget to use the new exec_update_mutex instead of cred_guard_mutex. This should be safe, as the credentials do not change before exec_update_mutex is locked. Therefore whatever file access is possible with holding the cred_guard_mutex here is also possbile with the exec_update_mutex. Signed-off-by: Bernd Edlinger Signed-off-by: Eric W. Biederman --- kernel/pid.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/pid.c b/kernel/pid.c index 60820e72634c..efd34874b3d1 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -577,7 +577,7 @@ static struct file *__pidfd_fget(struct task_struct *task, int fd) struct file *file; int ret; - ret = mutex_lock_killable(&task->signal->cred_guard_mutex); + ret = mutex_lock_killable(&task->signal->exec_update_mutex); if (ret) return ERR_PTR(ret); @@ -586,7 +586,7 @@ static struct file *__pidfd_fget(struct task_struct *task, int fd) else file = ERR_PTR(-EPERM); - mutex_unlock(&task->signal->cred_guard_mutex); + mutex_unlock(&task->signal->exec_update_mutex); return file ?: ERR_PTR(-EBADF); }