The patch titled
tty: fix the locking for signal->session in disassociate_ctty
has been added to the -mm tree. Its filename is
tty-fix-the-locking-for-signal-session-in-disassociate_ctty.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: tty: fix the locking for signal->session in disassociate_ctty
From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
commit 24ec839c431eb79bb8f6abc00c4e1eb3b8c4d517 while fixing the locking for
signal->tty got the locking wrong for signal->session. This places our
accesses of signal->session back under the tasklist_lock where they belong.
Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/char/tty_io.c | 4 +---
1 files changed, 1 insertion(+), 3 deletions(-)
diff -puN drivers/char/tty_io.c~tty-fix-the-locking-for-signal-session-in-disassociate_ctty drivers/char/tty_io.c
--- a/drivers/char/tty_io.c~tty-fix-the-locking-for-signal-session-in-disassociate_ctty
+++ a/drivers/char/tty_io.c
@@ -1496,7 +1496,6 @@ void disassociate_ctty(int on_exit)
{
struct tty_struct *tty;
int tty_pgrp = -1;
- int session;
lock_kernel();
@@ -1530,7 +1529,6 @@ void disassociate_ctty(int on_exit)
spin_lock_irq(¤t->sighand->siglock);
current->signal->tty_old_pgrp = 0;
- session = process_session(current);
spin_unlock_irq(¤t->sighand->siglock);
mutex_lock(&tty_mutex);
@@ -1549,7 +1547,7 @@ void disassociate_ctty(int on_exit)
/* Now clear signal->tty under the lock */
read_lock(&tasklist_lock);
- session_clear_tty(session);
+ session_clear_tty(process_session(current));
read_unlock(&tasklist_lock);
unlock_kernel();
}
_
Patches currently in -mm which might be from ebiederm@xxxxxxxxxxxx are
origin.patch
revert-identifier-to-nsproxy.patch
vt-fix-comments-to-not-refer-to-kill_proc.patch
n_r3964-use-struct-pid-to-track-user-space-clients.patch
smbfs-make-conn_pid-a-struct-pid.patch
ncpfs-use-struct-pid-to-track-the-userspace-watchdog-process.patch
ncpfs-ensure-we-free-wdog_pid-on-parse_option-or-fill_inode-failure.patch
usbatm-update-to-use-the-kthread-api.patch
genapic-optimize-fix-apic-mode-setup-2.patch
genapic-always-use-physical-delivery-mode-on-8-cpus.patch
genapic-remove-es7000-workaround.patch
genapic-remove-clustered-apic-mode.patch
genapic-default-to-physical-mode-on-hotplug-cpu-kernels.patch
vt-refactor-console-sak-processing.patch
sysctl_ms_jiffies-fix-oldlen-semantics.patch
9p-use-kthread_stop-instead-of-sending-a-sigkill.patch
tty-make-__proc_set_tty-static.patch
tty-clarify-disassociate_ctty.patch
tty-fix-the-locking-for-signal-session-in-disassociate_ctty.patch
signal-use-kill_pgrp-not-kill_pg-in-the-sunos-compatibility-code.patch
signal-rewrite-kill_something_info-so-it-uses-newer-helpers.patch
pid-make-session_of_pgrp-use-struct-pid-instead-of-pid_t.patch
pid-use-struct-pid-for-talking-about-process-groups-in-exitc.patch
pid-replace-is_orphaned_pgrp-with-is_current_pgrp_orphaned.patch
tty-update-the-tty-layer-to-work-with-struct-pid.patch
pid-replace-do-while_each_task_pid-with-do-while_each_pid_task.patch
pid-remove-now-unused-do_each_task_pid-and-while_each_task_pid.patch
pid-remove-the-now-unused-kill_pg-kill_pg_info-and-__kill_pg_info.patch
sched2-sched-domain-sysctl-use-ctl_unnumbered.patch
mm-implement-swap-prefetching-use-ctl_unnumbered.patch
readahead-sysctl-parameters-use-ctl_unnumbered.patch
updated-i386-cleanup-apic-code.patch
updated-i386-rework-local-apic-calibration.patch
updated-dynticks-fix-nmi-watchdog.patch
clockevents-core-check-for-clock-event-device-handler-being-non-null-before-calling-it.patch
pidhash-temporary-debug-checks.patch
vdso-print-fatal-signals-use-ctl_unnumbered.patch
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