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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_fdpic.c
parent15b9f360c0316c06d37c09b02d85565edbaf9dd3 (diff)
downloadop-kernel-dev-24d5288f06ed8b3a368eba967d587cdb012dfdf7.zip
op-kernel-dev-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_fdpic.c')
-rw-r--r--fs/binfmt_elf_fdpic.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index d051a32..71bcc4b 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1626,6 +1626,9 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
rcu_read_lock();
do_each_thread(g,p)
if (current->mm == p->mm && current != p) {
+ if (p->flags & PF_KTHREAD)
+ continue;
+
tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
if (!tmp) {
rcu_read_unlock();
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