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authorOleg Nesterov <oleg@tv-sign.ru>2008-07-25 01:47:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:39 -0700
commit24d5288f06ed8b3a368eba967d587cdb012dfdf7 (patch)
tree77844e275f2e3bcdc64427e64633e82f0207476d /fs/binfmt_elf.c
parent15b9f360c0316c06d37c09b02d85565edbaf9dd3 (diff)
downloadconfigs-24d5288f06ed8b3a368eba967d587cdb012dfdf7.tar.gz
coredump: elf_core_dump: skip kernel threads
linux_binfmt->core_dump() runs before the process does exit_aio(), this means that we can hit the kernel thread which shares the same ->mm. Afaics, nothing really bad can happen, but perhaps it makes sense to fix this minor bug. It is sad we have to iterate over all threads in system and use GFP_ATOMIC. Hopefully we can kill theses ugly do_each_thread()s, but this needs some nontrivial changes in mm_struct and do_coredump. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/binfmt_elf.c')
-rw-r--r--fs/binfmt_elf.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 639d2d8b571..bad7d8770d7 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1520,6 +1520,9 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
rcu_read_lock();
do_each_thread(g, p)
if (p->mm == dump_task->mm) {
+ if (p->flags & PF_KTHREAD)
+ continue;
+
t = kzalloc(offsetof(struct elf_thread_core_info,
notes[info->thread_notes]),
GFP_ATOMIC);
@@ -1724,6 +1727,9 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
rcu_read_lock();
do_each_thread(g, p)
if (current->mm == p->mm && current != p) {
+ if (p->flags & PF_KTHREAD)
+ continue;
+
ets = kzalloc(sizeof(*ets), GFP_ATOMIC);
if (!ets) {
rcu_read_unlock();