Commit-ID: 6279a751fe096a21dc7704e918d570d3ff06e769
Gitweb: http://git.kernel.org/tip/6279a751fe096a21dc7704e918d570d3ff06e769
Author: Oleg Nesterov <oleg@xxxxxxxxxx>
AuthorDate: Fri, 27 Mar 2009 01:06:07 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 8 Apr 2009 17:51:38 +0200
posix-timers: fix RLIMIT_CPU && fork()
See http://bugzilla.kernel.org/show_bug.cgi?id=12911
copy_signal() copies signal->rlim, but RLIMIT_CPU is "lost". Because
posix_cpu_timers_init_group() sets cputime_expires.prof_exp = 0 and thus
fastpath_timer_check() returns false unless we have other expired cpu timers.
Change copy_signal() to set cputime_expires.prof_exp if we have RLIMIT_CPU.
Also, set cputimer.running = 1 in that case. This is not strictly necessary,
but imho makes sense.
Reported-by: Peter Lojkin <ia6432@xxxxxxxx>
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Peter Lojkin <ia6432@xxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: stable@xxxxxxxxxx
LKML-Reference: <20090327000607.GA10104@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/fork.c | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index 4854c2c..9b51a1b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -808,6 +808,12 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
sig->cputime_expires.virt_exp = cputime_zero;
sig->cputime_expires.sched_exp = 0;
+ if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
+ sig->cputime_expires.prof_exp =
+ secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
+ sig->cputimer.running = 1;
+ }
+
/* The timer lists. */
INIT_LIST_HEAD(&sig->cpu_timers[0]);
INIT_LIST_HEAD(&sig->cpu_timers[1]);
@@ -823,11 +829,8 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
atomic_inc(¤t->signal->live);
return 0;
}
- sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
-
- if (sig)
- posix_cpu_timers_init_group(sig);
+ sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
tsk->signal = sig;
if (!sig)
return -ENOMEM;
@@ -865,6 +868,8 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
task_unlock(current->group_leader);
+ posix_cpu_timers_init_group(sig);
+
acct_init_pacct(&sig->pacct);
tty_audit_fork(sig);
--
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