- 29 Sep, 2006 1 commit
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Roland McGrath authored
This tightens up __dequeue_signal a little. It also avoids doing recalc_sigpending twice in a row, instead doing it once in dequeue_signal. Signed-off-by:
Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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- 27 Sep, 2006 1 commit
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David Howells authored
Move the fallback arch_vma_name() to a sensible place (kernel/signal.c). Currently it's in fs/proc/task_mmu.c, a file that is dependent on both CONFIG_PROC_FS and CONFIG_MMU being enabled, but it's used from kernel/signal.c from where it is called unconditionally. [akpm@osdl.org: build fix] Signed-off-by:
David Howells <dhowells@redhat.com> Signed-off-by:
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- 02 Aug, 2006 1 commit
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Linus Torvalds authored
Suresh points out that commit b0423a0d broke the semantics of a synchronous signal like SIGSEGV occurring recursively inside its own handler handler (or, indeed, any other context when the signal was blocked). That was unintentional, and this fixes things up by reinstating the old semantics, but without reverting the cleanups. Cc: Paul E. McKenney <paulmck@us.ibm.com> Acked-by:
Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by:
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- 30 Jun, 2006 2 commits
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David Quigley authored
This patch adds a call to the extended security_task_kill hook introduced by the prior patch to the kill_proc_info_as_uid function so that these signals can be properly mediated by security modules. It also updates the existing hook call in check_kill_permission. Signed-off-by:
David Quigley <dpquigl@tycho.nsa.gov> Signed-off-by:
James Morris <jmorris@namei.org> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: Chris Wright <chrisw@sous-sol.org> Signed-off-by:
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Jörn Engel authored
Signed-off-by:
Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by:
Adrian Bunk <bunk@stusta.de>
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- 26 Jun, 2006 1 commit
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Oleg Nesterov authored
With this patch zap_process() sets SIGNAL_GROUP_EXIT while sending SIGKILL to the thread group. This means that a TASK_TRACED task 1. Will be awakened by signal_wake_up(1) 2. Can't sleep again via ptrace_notify() 3. Can't go to do_signal_stop() after return from ptrace_stop() in get_signal_to_deliver() So we can remove all ptrace related stuff from coredump path. Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Roland McGrath <roland@redhat.com> Signed-off-by:
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- 20 Jun, 2006 1 commit
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Al Viro authored
Signed-off-by:Al Viro <viro@zeniv.linux.org.uk>
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- 14 Apr, 2006 1 commit
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Roland McGrath authored
This reverts most of commit 30e0fca6. It broke the case of non-leader MT exec when ptraced. I think the bug it was intended to fix was already addressed by commit 788e05a6 . Signed-off-by:
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- 11 Apr, 2006 1 commit
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Oleg Nesterov authored
Commit e56d0903 [PATCH] RCU signal handling made this BUG_ON() unsafe. This code runs under ->siglock, while switch_exec_pids() takes tasklist_lock. Signed-off-by:
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- 02 Apr, 2006 1 commit
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Eric Sesterhenn authored
this changes if() BUG(); constructs to BUG_ON() which is cleaner, contains unlikely() and can better optimized away. Signed-off-by:
Eric Sesterhenn <snakebyte@gmx.de> Signed-off-by:
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- 31 Mar, 2006 1 commit
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Pavel Machek authored
strace /bin/bash misbehaves after resume; this fixes it. (akpm: it's scary calling refrigerator() in state TASK_TRACED, but it seems to do the right thing). Signed-off-by:
Pavel Machek <pavel@suse.cz> Signed-off-by:
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- 28 Mar, 2006 16 commits
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Oleg Nesterov authored
send_sigqueue() checks PF_EXITING, then locks p->sighand->siglock. This is unsafe: 'p' can exit in between and set ->sighand = NULL. The race is theoretical, the window is tiny and irqs are disabled by the caller, so I don't think we need the fix for -stable tree. Convert send_sigqueue() to use lock_task_sighand() helper. Also, delete 'p->flags & PF_EXITING' re-check, it is unneeded and the comment is wrong. Signed-off-by:
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Oleg Nesterov authored
The previous patch has changed callsites of do_notify_parent_cldstop() so that to_self == (->ptrace & PT_PTRACED) always (as it should be). We can remove this parameter now. Signed-off-by:
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Oleg Nesterov authored
Remove an obscure 'stop_count < 0' check in finish_stop(). The previous patch made this case impossible. Signed-off-by:
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Oleg Nesterov authored
do_signal_stop() considers 'thread_group_empty()' as a special case. This was needed to avoid taking tasklist_lock. Since this lock is unneeded any longer, we can remove this special case and simplify the code even more. Also, before this patch, finish_stop() was called with stop_count == -1 for 'thread_group_empty()' case. This is not strictly wrong, but confusing and unneeded. Signed-off-by:
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Oleg Nesterov authored
do_sigaction() does not need tasklist_lock anymore, we can simplify the code. Signed-off-by:
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Oleg Nesterov authored
do_signal_stop() does not need tasklist_lock anymore. So it does not need to do misc re-checks, and we can simplify the code. Signed-off-by:
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Oleg Nesterov authored
handle_stop_signal() does not need tasklist_lock for SIG_KERNEL_STOP_MASK signals anymore. Signed-off-by:
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Oleg Nesterov authored
__exit_signal() is private to release_task() now. I think it is better to make it static in kernel/exit.c and export flush_sigqueue() instead - this function is much more simple and straightforward. Signed-off-by:
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Oleg Nesterov authored
Cosmetic, rename __exit_sighand to cleanup_sighand and move it close to copy_sighand(). This matches copy_signal/cleanup_signal naming, and I think it is easier to follow. Signed-off-by:
"Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by:
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Oleg Nesterov authored
This patch factors out duplicated code under 'if' branches. Also, BUG_ON() conversions and whitespace cleanups. Signed-off-by:
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Oleg Nesterov authored
__exit_signal() does important cleanups atomically under ->siglock. It is also called from copy_process's error path. This is not good, for example we can't move __unhash_process() under ->siglock for that reason. We should not mix these 2 paths, just look at ugly 'if (p->sighand)' under 'bad_fork_cleanup_sighand:' label. For copy_process() case it is sufficient to just backout copy_signal(), nothing more. Again, nobody can see this task yet. For CLONE_THREAD case we just decrement signal->count, otherwise nobody can see this ->signal and we can free it lockless. This patch assumes it is safe to do exit_thread_group_keys() without tasklist_lock. Signed-off-by:
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Oleg Nesterov authored
The only caller of exit_sighand(tsk) is copy_process's error path. We can call __exit_sighand() directly and kill exit_sighand(). This 'tsk' was not yet registered in pid_hash[] or init_task.tasks, it has no external references, nobody can see it, and IF (clone_flags & CLONE_SIGHAND) At least 'current' has a reference to ->sighand, this means atomic_dec_and_test(sighand->count) can't be true. ELSE Nobody can see this ->sighand, this means we can free it without any locking. Signed-off-by:
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Oleg Nesterov authored
In my opinion this patch cleans up the code. Signed-off-by:
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Oleg Nesterov authored
Add lock_task_sighand() helper and converts group_send_sig_info() to use it. Hopefully we will have more users soon. This patch also removes '!sighand->count' and '!p->usage' checks, I think they both are bogus, racy and unneeded (but probably it makes sense to restore them as BUG_ON()s). ->sighand is cleared and it's ->count is decremented in release_task() with sighand->siglock held, so it is a bug to have '!p->usage || !->count' after we already locked and verified it is the same. On the other hand, an already dead task without ->sighand can have a non-zero ->usage due to ptrace, for example. If we read the stale value of ->sighand we must see the change after spin_lock(), because that change was done while holding that same old ->sighand.siglock. Signed-off-by:
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Oleg Nesterov authored
This patch borrows a clever Hugh's 'struct anon_vma' trick. Without tasklist_lock held we can't trust task->sighand until we locked it and re-checked that it is still the same. But this means we don't need to defer 'kmem_cache_free(sighand)'. We can return the memory to slab immediately, all we need is to be sure that sighand->siglock can't dissapear inside rcu protected section. To do so we need to initialize ->siglock inside ctor function, SLAB_DESTROY_BY_RCU does the rest. Signed-off-by:
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Eric W. Biederman authored
After looking at the problem of init calling exec some more I figured out an easy way to make the code work. The actual symptom without out this patch is that all threads will die except pid == 1, and the thread calling exec. The thread calling exec will wait forever for pid == 1 to die. Since pid == 1 does not install a handler for SIGKILL it will never die. This modifies the tests for init from current->pid == 1 to the equivalent current == child_reaper. And then it causes exec in the ugly case to modify child_reaper. The only weird symptom is that you wind up with an init process that doesn't have the oldest start time on the box. Signed-off-by:
Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by:
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- 23 Mar, 2006 2 commits
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Oleg Nesterov authored
Cleanup, remove unneeded double copying of current->blocked. Signed-off-by:
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Rafael J. Wysocki authored
This patch from Pavel moves userland freeze signals handling into more logical place. It now hits even with mysqld running. Signed-off-by:
Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by:
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- 09 Feb, 2006 2 commits
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Oleg Nesterov authored
Clear unblockable signals beforehand. Signed-off-by:
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Oleg Nesterov authored
Pointed out by Linus Torvalds. sys_signal() forgets to initialize ->sa_mask. ( I suspect arch/ia64/ia32/ia32_signal.c:sys32_signal() also needs this fix ) Signed-off-by:
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- 03 Feb, 2006 1 commit
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Andrew Morton authored
Five callsites. I dunno how all this crap got back in there :( Signed-off-by:
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- 18 Jan, 2006 1 commit
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David Woodhouse authored
The TIF_RESTORE_SIGMASK flag allows us to have a generic implementation of sys_rt_sigsuspend() instead of duplicating it for each architecture. This provides such an implementation and makes arch/powerpc use it. It also tidies up the ppc32 sys_sigsuspend() to use TIF_RESTORE_SIGMASK. Signed-off-by:
David Woodhouse <dwmw2@infradead.org> Signed-off-by:
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- 14 Jan, 2006 1 commit
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Arjan van de Ven authored
Remove the "inline" keyword from a bunch of big functions in the kernel with the goal of shrinking it by 30kb to 40kb Signed-off-by:
Arjan van de Ven <arjan@infradead.org> Signed-off-by:
Ingo Molnar <mingo@elte.hu> Acked-by:
Jeff Garzik <jgarzik@pobox.com> Signed-off-by:
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- 11 Jan, 2006 1 commit
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Randy.Dunlap authored
- Move capable() from sched.h to capability.h; - Use <linux/capability.h> where capable() is used (in include/, block/, ipc/, kernel/, a few drivers/, mm/, security/, & sound/; many more drivers/ to go) Signed-off-by:
Randy Dunlap <rdunlap@xenotime.net> Signed-off-by:
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- 08 Jan, 2006 5 commits
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Oleg Nesterov authored
This patch removes unneeded sig->curr_target recalculation under 'if (atomic_dec_and_test(&sig->count))' in __exit_signal(). When sig->count == 0 the signal can't be sent to this task and next_thread(tsk) == tsk anyway. Signed-off-by:
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Oleg Nesterov authored
Use symbolic names instead of hardcoded constants. Signed-off-by:
Harald Welte <laforge@gnumonks.org> Signed-off-by:
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George Anzinger authored
While rooting aroung in the signal code trying to understand how to fix the SIG_IGN ploy (set sig handler to SIG_IGN and flood system with high speed repeating timers) I came across what, I think, is a problem in sigaction() in that when processing a SIG_IGN request it flushes signals from 1 to SIGRTMIN and leaves the rest. Attempt to fix this. Signed-off-by:
George Anzinger <george@mvista.com> Cc: Roland McGrath <roland@redhat.com> Cc: Linus Torvalds <torvalds@osdl.org> Signed-off-by:
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Paul E. McKenney authored
Some simplification in checking signal delivery against concurrent exit. Instead of using get_task_struct_rcu(), which increments the task_struct reference count, check the reference count after acquiring sighand lock. Signed-off-by:
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Ingo Molnar authored
RCU tasklist_lock and RCU signal handling: send signals RCU-read-locked instead of tasklist_lock read-locked. This is a scalability improvement on SMP and a preemption-latency improvement under PREEMPT_RCU. Signed-off-by:
William Irwin <wli@holomorphy.com> Cc: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by:
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