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authorThomas Gleixner <tglx@linutronix.de>2009-12-09 14:19:31 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2010-10-30 08:45:25 -0400
commit3c80fe4ac9cfb13b1bfa4edf1544e8b656716694 (patch)
treec605435b642323cd76eea9567a43d8c67b9c9db1 /kernel/Kconfig.hz
parentf7a998a9491f2da1d3e44d150aa611d10093da4f (diff)
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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 'kernel/Kconfig.hz')
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