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authorThomas Gleixner <tglx@linutronix.de>2009-12-09 09:19:31 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2010-10-30 08:45:25 -0400
commit3c80fe4ac9cfb13b1bfa4edf1544e8b656716694 (patch)
treec605435b642323cd76eea9567a43d8c67b9c9db1 /include
parentf7a998a9491f2da1d3e44d150aa611d10093da4f (diff)
audit: Call tty_audit_push_task() outside preempt disabled
While auditing all tasklist_lock read_lock sites I stumbled over the following call chain: audit_prepare_user_tty() read_lock(&tasklist_lock); tty_audit_push_task(); mutex_lock(&buf->mutex); --> buf->mutex is locked with preemption disabled. Solve this by acquiring a reference to the task struct under rcu_read_lock and call tty_audit_push_task outside of the preempt disabled region. Move all code which needs to be protected by sighand lock into tty_audit_push_task() and use lock/unlock_sighand as we do not hold tasklist_lock. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric Paris <eparis@redhat.com> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/tty.h9
1 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index e500171c745f..2a754748dd5f 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -541,8 +541,8 @@ extern void tty_audit_exit(void);
541extern void tty_audit_fork(struct signal_struct *sig); 541extern void tty_audit_fork(struct signal_struct *sig);
542extern void tty_audit_tiocsti(struct tty_struct *tty, char ch); 542extern void tty_audit_tiocsti(struct tty_struct *tty, char ch);
543extern void tty_audit_push(struct tty_struct *tty); 543extern void tty_audit_push(struct tty_struct *tty);
544extern void tty_audit_push_task(struct task_struct *tsk, 544extern int tty_audit_push_task(struct task_struct *tsk,
545 uid_t loginuid, u32 sessionid); 545 uid_t loginuid, u32 sessionid);
546#else 546#else
547static inline void tty_audit_add_data(struct tty_struct *tty, 547static inline void tty_audit_add_data(struct tty_struct *tty,
548 unsigned char *data, size_t size) 548 unsigned char *data, size_t size)
@@ -560,9 +560,10 @@ static inline void tty_audit_fork(struct signal_struct *sig)
560static inline void tty_audit_push(struct tty_struct *tty) 560static inline void tty_audit_push(struct tty_struct *tty)
561{ 561{
562} 562}
563static inline void tty_audit_push_task(struct task_struct *tsk, 563static inline int tty_audit_push_task(struct task_struct *tsk,
564 uid_t loginuid, u32 sessionid) 564 uid_t loginuid, u32 sessionid)
565{ 565{
566 return 0;
566} 567}
567#endif 568#endif
568 569