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7f2a525559
linux/kernel
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Roland McGrath 7f2a525559 [PATCH] wait4 PTRACE_ATTACH race fix 
Back about a year ago when I last fiddled heavily with the do_wait code, I
was thinking too hard about the wrong thing and I now think I introduced a
bug whose inverse thought I was fixing.

Apparently noone was looking too hard over much shoulder, so as to cite my
bogus reasoning at the time.  In the race condition when PTRACE_ATTACH is
about to steal a child and then the child hits a tracing event (what
my_ptrace_child checks for), the real parent does need to set its flag
noting it has some eligible live children.  Otherwise a spurious ECHILD
error is possible, since the child in question is not yet on the
ptrace_children list.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 17:37:24 -08:00
..
irq [PATCH] CHECK_IRQ_PER_CPU() to avoid dead code in __do_IRQ() 2005-09-07 16:57:29 -07:00
power [PATCH] introduce .valid callback for pm_ops 2005-10-30 17:37:15 -08:00
acct.c [PATCH] mm: rss = file_rss + anon_rss 2005-10-29 21:40:38 -07:00
audit.c [PATCH] gfp_t: kernel/* 2005-10-28 08:16:49 -07:00
auditsc.c [PATCH] gfp_t: kernel/* 2005-10-28 08:16:49 -07:00
capability.c [PATCH] kernel/capability.c: add kerneldoc 2005-07-27 16:26:06 -07:00
compat.c [PATCH] kernel: fix-up schedule_timeout() usage 2005-09-10 10:06:37 -07:00
configs.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpu.c [PATCH] create and destroy cpufreq sysfs entries based on cpu notifiers 2005-10-30 17:37:14 -08:00
cpuset.c [PATCH] cpusets: automatic numa mempolicy rebinding 2005-10-30 17:37:22 -08:00
crash_dump.c [PATCH] kernel/crash_dump.c: add kerneldoc 2005-07-27 16:26:06 -07:00
dma.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exec_domain.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exit.c [PATCH] wait4 PTRACE_ATTACH race fix 2005-10-30 17:37:24 -08:00
extable.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fork.c [PATCH] mm: ptd_alloc take ptlock 2005-10-29 21:40:40 -07:00
futex.c [PATCH] mm: follow_page with inner ptlock 2005-10-29 21:40:41 -07:00
intermodule.c [PATCH] introduce and use kzalloc 2005-09-07 16:57:45 -07:00
itimer.c [PATCH] itimer fixes 2005-07-27 16:25:51 -07:00
kallsyms.c [PATCH] ppc32: platform-specific functions missing from kallsyms. 2005-05-05 16:36:31 -07:00
Kconfig.hz [PATCH] i386: Selectable Frequency of the Timer Interrupt 2005-06-23 09:45:10 -07:00
Kconfig.preempt [PATCH] sched: voluntary kernel preemption 2005-06-25 16:24:45 -07:00
kexec.c [PATCH] mm: split page table lock 2005-10-29 21:40:42 -07:00
kfifo.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
kmod.c [PATCH] Keys: Get rid of warning in kmod.c if keys disabled 2005-10-30 17:37:23 -08:00
kprobes.c [PATCH] kprobes: fix bug when probed on task and isr functions 2005-09-07 16:58:01 -07:00
ksysfs.c [PATCH] Kdump: Export crash notes section address through sysfs 2005-06-25 16:24:51 -07:00
kthread.c [PATCH] Add kthread_stop_sem() 2005-10-30 17:37:17 -08:00
Makefile [PATCH] Remove redundant configs.o 2005-10-30 17:37:10 -08:00
module.c [PATCH] use add_taint() for setting tainted bit flags 2005-09-13 08:22:29 -07:00
panic.c [PATCH] Call emergency_reboot from panic 2005-07-26 14:35:43 -07:00
params.c [PATCH] Ignore trailing whitespace on kernel parameters correctly 2005-09-28 07:46:41 -07:00
pid.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
posix-cpu-timers.c [PATCH] Yet more posix-cpu-timer fixes 2005-10-27 09:08:43 -07:00
posix-timers.c [PATCH] posix-timers: use schedule_timeout() in common_nsleep() 2005-10-30 17:37:20 -08:00
printk.c [PATCH] cleanup for kernel/printk.c 2005-10-30 17:37:23 -08:00
profile.c [PATCH] mostly_read data section 2005-07-07 18:23:46 -07:00
ptrace.c [PATCH] ptrace/coredump/exit_group deadlock 2005-10-30 17:37:22 -08:00
rcupdate.c [PATCH] rcu: keep rcu callback event counter 2005-10-17 15:27:58 -07:00
resource.c [PATCH] introduce and use kzalloc 2005-09-07 16:57:45 -07:00
sched.c [PATCH] mm: update_hiwaters just in time 2005-10-29 21:40:39 -07:00
seccomp.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
signal.c [PATCH] ptrace/coredump/exit_group deadlock 2005-10-30 17:37:22 -08:00
softirq.c [PATCH] x86-64: Some cleanup and optimization to the processor data area. 2005-09-12 10:49:58 -07:00
softlockup.c [PATCH] detect soft lockups 2005-09-07 16:57:17 -07:00
spinlock.c [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
stop_machine.c [PATCH] smp_processor_id() cleanup 2005-06-21 18:46:13 -07:00
sys_ni.c [PATCH] remove sys_set_zone_reclaim() 2005-08-01 10:03:56 -07:00
sys.c [PATCH] reboot: comment and factor the main reboot functions 2005-09-22 22:17:33 -07:00
sysctl.c [NET]: Fix sparse warnings 2005-08-29 16:01:32 -07:00
time.c [PATCH] NTP shift_right cleanup 2005-10-30 17:37:18 -08:00
timer.c [PATCH] remove timer debug field 2005-10-30 17:37:18 -08:00
uid16.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
user.c [PATCH] inotify 2005-07-12 20:38:38 -07:00
wait.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
workqueue.c [PATCH] Use alloc_percpu to allocate workqueues locally 2005-10-30 17:37:18 -08:00