diff options
| author | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-26 15:04:02 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-28 15:03:00 -0800 |
| commit | 0a1c275a44db55b2624652b04d4ed9430e82957b (patch) | |
| tree | 64eaee6810b16336cae92d586ff941dda670d150 | |
| parent | 01e991b8eb2cc28f41ed3f96ec33ae3dd6b860a3 (diff) | |
| download | lwn-0a1c275a44db55b2624652b04d4ed9430e82957b.tar.gz lwn-0a1c275a44db55b2624652b04d4ed9430e82957b.zip | |
fnctl: f_modown should call write_lock_irqsave/restore
commit b04da8bfdfbbd79544cab2fadfdc12e87eb01600 upstream.
Commit 703625118069f9f8960d356676662d3db5a9d116 exposed that f_modown()
should call write_lock_irqsave instead of just write_lock_irq so that
because a caller could have a spinlock held and it would not be good to
renable interrupts.
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Tavis Ormandy <taviso@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/fcntl.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c index 97e01dc0d95f..5ef953e6f908 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -199,7 +199,9 @@ static int setfl(int fd, struct file * filp, unsigned long arg) static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, int force) { - write_lock_irq(&filp->f_owner.lock); + unsigned long flags; + + write_lock_irqsave(&filp->f_owner.lock, flags); if (force || !filp->f_owner.pid) { put_pid(filp->f_owner.pid); filp->f_owner.pid = get_pid(pid); @@ -211,7 +213,7 @@ static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, filp->f_owner.euid = cred->euid; } } - write_unlock_irq(&filp->f_owner.lock); + write_unlock_irqrestore(&filp->f_owner.lock, flags); } int __f_setown(struct file *filp, struct pid *pid, enum pid_type type, |