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[PATCH] selinux: fix tty locking

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Take tty_mutex when accessing ->signal->tty in selinux code.  Noted by Alan
Cox.  Longer term, we are looking at refactoring the code to provide better
encapsulation of the tty layer, but this is a simple fix that addresses the
immediate bug.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Alan Cox <alan@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stephen Smalley 2006-09-25 23:32:03 -07:00 committed by Linus Torvalds
parent bc7e982b84
commit b20c8122a3
1 changed files with 4 additions and 1 deletions
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5
security/selinux/hooks.c
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@ -1689,10 +1689,12 @@ static inline void flush_unauthorized_files(struct files_struct * files)
{
struct avc_audit_data ad;
struct file *file, *devnull = NULL;
struct tty_struct *tty = current->signal->tty;
struct tty_struct *tty;
struct fdtable *fdt;
long j = -1;
mutex_lock(&tty_mutex);
tty = current->signal->tty;
if (tty) {
file_list_lock();
file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
@ -1712,6 +1714,7 @@ static inline void flush_unauthorized_files(struct files_struct * files)
}
file_list_unlock();
}
mutex_unlock(&tty_mutex);
/* Revalidate access to inherited open files. */