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authorAlan Cox <alan@redhat.com>2008-10-13 10:39:13 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-13 09:51:41 -0700
commit452a00d2ee288f2cbc36f676edd06cb14d2878c1 (patch)
treec8251c73924a6ac9b174bc557357bfeff0c8d1a8 /security
parentf4d2a6c2096b764decb20070b1bf4356de9144a8 (diff)
downloadlinux-linaro-stable-452a00d2ee288f2cbc36f676edd06cb14d2878c1.tar.gz
tty: Make get_current_tty use a kref
We now return a kref covered tty reference. That ensures the tty structure doesn't go away when you have a return from get_current_tty. This is not enough to protect you from most of the resources being freed behind your back - yet. [Updated to include fixes for SELinux problems found by Andrew Morton and an s390 leak found while debugging the former] Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/hooks.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 4a7374c12d9c..089d61a23952 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2123,6 +2123,7 @@ static inline void flush_unauthorized_files(struct files_struct *files)
mutex_lock(&tty_mutex);
tty = get_current_tty();
+ mutex_unlock(&tty_mutex);
if (tty) {
file_list_lock();
file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
@@ -2139,8 +2140,8 @@ static inline void flush_unauthorized_files(struct files_struct *files)
}
}
file_list_unlock();
+ tty_kref_put(tty);
}
- mutex_unlock(&tty_mutex);
/* Reset controlling tty. */
if (drop_tty)
no_tty();