diff options
| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-07-25 01:47:40 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-25 10:53:39 -0700 |
| commit | 24d5288f06ed8b3a368eba967d587cdb012dfdf7 (patch) | |
| tree | 77844e275f2e3bcdc64427e64633e82f0207476d /fs | |
| parent | 15b9f360c0316c06d37c09b02d85565edbaf9dd3 (diff) | |
| download | lwn-24d5288f06ed8b3a368eba967d587cdb012dfdf7.tar.gz lwn-24d5288f06ed8b3a368eba967d587cdb012dfdf7.zip | |
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')
| -rw-r--r-- | fs/binfmt_elf.c | 6 | ||||
| -rw-r--r-- | fs/binfmt_elf_fdpic.c | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 639d2d8b5710..bad7d8770d72 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(); diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index d051a32e6270..71bcc4b4d088 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(); |