Messages in this thread Patch in this message | | | Subject | [parch] sched: task_times() explosion avoidance for tasks with > 2^32 acrued ticks | From | Mike Galbraith <> | Date | Mon, 06 Aug 2012 15:58:59 +0200 |
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If stime + utime > 2^32, and lower 32 are 0 when user calls getrusage(), you've got a dead box.
Signed-off-by: Mike Galbraith <efault@gmx.de>
kernel/sched/core.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 82ad284..0ac2cac 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3151,7 +3151,7 @@ void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st) */ rtime = nsecs_to_cputime(p->se.sum_exec_runtime); - if (total) { + if (total && total == (__force u32) total) { u64 temp = (__force u64) rtime; temp *= (__force u64) utime; @@ -3184,7 +3184,7 @@ void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st) total = cputime.utime + cputime.stime; rtime = nsecs_to_cputime(cputime.sum_exec_runtime); - if (total) { + if (total && total == (__force u32) total) { u64 temp = (__force u64) rtime; temp *= (__force u64) cputime.utime;
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