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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2006-09-29 02:01:41 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:25 -0700
commiteb84a20e9e6b98dcb33023ad22241d79107a08a7 (patch)
tree4971aef730cc3a1917463afe1dbb381dea664e99 /kernel
parent5f412b24240d92212e50ebbaff2dff20c9e6f3d0 (diff)
[PATCH] audit/accounting: tty locking
Add tty locking around the audit and accounting code. The whole current->signal-> locking is all deeply strange but it's for someone else to sort out. Add rather than replace the lock for acct.c Signed-off-by: Alan Cox <alan@redhat.com> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/acct.c6
-rw-r--r--kernel/auditsc.c5
2 files changed, 10 insertions, 1 deletions
diff --git a/kernel/acct.c b/kernel/acct.c
index 2a7c933651c7..f4330acead46 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -483,10 +483,14 @@ static void do_acct_process(struct file *file)
ac.ac_ppid = current->parent->tgid;
#endif
- read_lock(&tasklist_lock); /* pin current->signal */
+ mutex_lock(&tty_mutex);
+ /* FIXME: Whoever is responsible for current->signal locking needs
+ to use the same locking all over the kernel and document it */
+ read_lock(&tasklist_lock);
ac.ac_tty = current->signal->tty ?
old_encode_dev(tty_devnum(current->signal->tty)) : 0;
read_unlock(&tasklist_lock);
+ mutex_unlock(&tty_mutex);
spin_lock_irq(&current->sighand->siglock);
ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime)));
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index fb83c5cb8c32..105147631753 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -817,6 +817,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_format(ab, " success=%s exit=%ld",
(context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
context->return_code);
+
+ mutex_lock(&tty_mutex);
if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
tty = tsk->signal->tty->name;
else
@@ -838,6 +840,9 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
context->gid,
context->euid, context->suid, context->fsuid,
context->egid, context->sgid, context->fsgid, tty);
+
+ mutex_unlock(&tty_mutex);
+
audit_log_task_info(ab, tsk);
if (context->filterkey) {
audit_log_format(ab, " key=");

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