The patch titled
ia64: ptrace_attach_sync_user_rbs: avoid "task->signal != NULL" checks
has been added to the -mm tree. Its filename is
ia64-ptrace_attach_sync_user_rbs-avoid-task-signal-=-null-checks.patch
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------------------------------------------------------
Subject: ia64: ptrace_attach_sync_user_rbs: avoid "task->signal != NULL" checks
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Preparation to make task->signal immutable, no functional changes.
It doesn't matter which pointer we check under tasklist to ensure the task
was not released, ->signal or ->sighand. But we are going to make
->signal refcountable, change the code to use ->sighand.
Note: this code doesn't need this check and tasklist_lock at all, it
should be converted to use lock_task_sighand(). And, the code under
SIGNAL_STOP_STOPPED check looks wrong.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/ia64/kernel/ptrace.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN arch/ia64/kernel/ptrace.c~ia64-ptrace_attach_sync_user_rbs-avoid-task-signal-=-null-checks arch/ia64/kernel/ptrace.c
--- a/arch/ia64/kernel/ptrace.c~ia64-ptrace_attach_sync_user_rbs-avoid-task-signal-=-null-checks
+++ a/arch/ia64/kernel/ptrace.c
@@ -639,7 +639,7 @@ ptrace_attach_sync_user_rbs (struct task
*/
read_lock(&tasklist_lock);
- if (child->signal) {
+ if (child->sighand) {
spin_lock_irq(&child->sighand->siglock);
if (child->state == TASK_STOPPED &&
!test_and_set_tsk_thread_flag(child, TIF_RESTORE_RSE)) {
@@ -663,7 +663,7 @@ ptrace_attach_sync_user_rbs (struct task
* job control stop, so that SIGCONT can be used to wake it up.
*/
read_lock(&tasklist_lock);
- if (child->signal) {
+ if (child->sighand) {
spin_lock_irq(&child->sighand->siglock);
if (child->state == TASK_TRACED &&
(child->signal->flags & SIGNAL_STOP_STOPPED)) {
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
linux-next.patch
posix-cpu-timers-reset-expire-cache-when-no-timer-is-running.patch
cpu-timers-simplify-rlimit_cpu-handling.patch
cpu-timers-cleanup-arm_timer.patch
cpu-timers-return-correct-previous-timer-reload-value.patch
cpu-timers-change-sigev_none-timer-implementation.patch
cpu-timers-assure-to-not-iterate-over-all-threads-in-fastpath_timer_check.patch
cpu-timers-optimize-run_posix_cpu_timers.patch
proc-cleanup-remove-unused-assignments.patch
kmod-add-init-function-to-usermodehelper.patch
exec-replace-call_usermodehelper_pipe-with-use-of-umh-init-function-and-resolve-limit.patch
umh-creds-convert-call_usermodehelper_keys-to-use-subprocess_info-init.patch
umh-creds-kill-subprocess_info-cred-logic.patch
call_usermodehelper-no-need-to-unblock-signals.patch
wait_for_helper-sigchld-from-user-space-can-lead-to-use-after-free.patch
call_usermodehelper-simplify-fix-umh_no_wait-case.patch
call_usermodehelper-umh_wait_exec-ignores-kernel_thread-failure.patch
coredump-factor-out-the-not-ispipe-file-checks.patch
coredump-cleanup-ispipe-code.patch
coredump-factor-out-put_cred-calls.patch
coredump-shift-down_writemmap_sem-into-coredump_wait.patch
exit-exit_notify-can-trust-signal-notify_count-0.patch
exit-change-zap_other_threads-to-count-sub-threads.patch
exit-avoid-sig-count-in-de_thread-__exit_signal-synchronization.patch
exit-avoid-sig-count-in-__exit_signal-to-detect-the-group-dead-case.patch
posix-cpu-timers-avoid-task-signal-=-null-checks.patch
ia64-ptrace_attach_sync_user_rbs-avoid-task-signal-=-null-checks.patch
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