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| author | Stephen Smalley <sds@tycho.nsa.gov> | 2006-09-25 23:32:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 08:48:53 -0700 |
| commit | b20c8122a3204496fca8b5343c93b60fe11dad04 (patch) | |
| tree | f807fb699dcec3f40a8de1a5c64f3653cf68bb6a /security/selinux | |
| parent | bc7e982b84aceef0a040c88ff659eb5c83818f72 (diff) | |
| download | linux-b20c8122a3204496fca8b5343c93b60fe11dad04.tar.gz linux-b20c8122a3204496fca8b5343c93b60fe11dad04.tar.bz2 linux-b20c8122a3204496fca8b5343c93b60fe11dad04.zip | |
[PATCH] selinux: fix tty locking
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>
Diffstat (limited to 'security/selinux')
| -rw-r--r-- | security/selinux/hooks.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 55cec4d6f117..e4d81a42fca4 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -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. */ |