diff options
| author | Alan Cox <alan@redhat.com> | 2008-10-13 10:40:53 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-13 09:51:42 -0700 |
| commit | dbda4c0b97b18fd59b3964548361b4f92357f730 (patch) | |
| tree | ca7e2827541aec01762f2a9c0e3155aaf49bf0ca | |
| parent | 934e6ebf96e8c1a0f299e64129fdaebc1132a427 (diff) | |
| download | lwn-dbda4c0b97b18fd59b3964548361b4f92357f730.tar.gz lwn-dbda4c0b97b18fd59b3964548361b4f92357f730.zip | |
tty: Fix abusers of current->sighand->tty
Various people outside the tty layer still stick their noses in behind the
scenes. We need to make sure they also obey the locking and referencing rules.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/acct.c | 2 | ||||
| -rw-r--r-- | kernel/auditsc.c | 9 |
2 files changed, 5 insertions, 6 deletions
diff --git a/kernel/acct.c b/kernel/acct.c index dd68b9059418..f6006a60df5d 100644 --- a/kernel/acct.c +++ b/kernel/acct.c @@ -548,7 +548,7 @@ static void do_acct_process(struct bsd_acct_struct *acct, #endif spin_lock_irq(¤t->sighand->siglock); - tty = current->signal->tty; + tty = current->signal->tty; /* Safe as we hold the siglock */ ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 59cedfb040e7..cf5bc2f5f9c3 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -246,8 +246,8 @@ static int audit_match_perm(struct audit_context *ctx, int mask) unsigned n; if (unlikely(!ctx)) return 0; - n = ctx->major; + switch (audit_classify_syscall(ctx->arch, n)) { case 0: /* native */ if ((mask & AUDIT_PERM_WRITE) && @@ -1204,13 +1204,13 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts (context->return_valid==AUDITSC_SUCCESS)?"yes":"no", context->return_code); - mutex_lock(&tty_mutex); - read_lock(&tasklist_lock); + spin_lock_irq(&tsk->sighand->siglock); if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) tty = tsk->signal->tty->name; else tty = "(none)"; - read_unlock(&tasklist_lock); + spin_unlock_irq(&tsk->sighand->siglock); + audit_log_format(ab, " a0=%lx a1=%lx a2=%lx a3=%lx items=%d" " ppid=%d pid=%d auid=%u uid=%u gid=%u" @@ -1230,7 +1230,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts context->egid, context->sgid, context->fsgid, tty, tsk->sessionid); - mutex_unlock(&tty_mutex); audit_log_task_info(ab, tsk); if (context->filterkey) { |