From: Török Edwin Date: Sun, 23 Nov 2008 10:39:07 +0000 (+0200) Subject: tracing/stack-tracer: fix locking and refcounts X-Git-Tag: v2.6.30-rc1~2^2~256^8~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cffa10aecb6891f090a4d53a075bc40c082c45fc;p=profile%2Fivi%2Fkernel-x86-ivi.git tracing/stack-tracer: fix locking and refcounts Impact: fix refcounting/object-access bug Hold mmap_sem while looking up/accessing vma. Hold the RCU lock while using the task we looked up. Signed-off-by: Török Edwin Signed-off-by: Ingo Molnar --- diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index dedf35f..4c3bd82 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1462,11 +1462,15 @@ static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, int ret = 1; if (mm) { - const struct vm_area_struct *vma = find_vma(mm, ip); + const struct vm_area_struct *vma; + + down_read(&mm->mmap_sem); + vma = find_vma(mm, ip); if (vma) { file = vma->vm_file; vmstart = vma->vm_start; } + up_read(&mm->mmap_sem); } if (file) { ret = trace_seq_path(s, &file->f_path); @@ -1494,10 +1498,9 @@ seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s, */ rcu_read_lock(); task = find_task_by_vpid(entry->ent.tgid); - rcu_read_unlock(); - if (task) mm = get_task_mm(task); + rcu_read_unlock(); } for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {