• GOTO Masanori's avatar
    [PATCH] Fix sigaltstack corruption among cloned threads · f9a3879a
    GOTO Masanori authored
    This patch fixes alternate signal stack corruption among cloned threads
    with CLONE_SIGHAND (and CLONE_VM) for linux-2.6.16-rc6.
    The value of alternate signal stack is currently inherited after a call of
    clone(...  CLONE_SIGHAND | CLONE_VM).  But if sigaltstack is set by a
    parent thread, and then if multiple cloned child threads (+ parent threads)
    call signal handler at the same time, some threads may be conflicted -
    because they share to use the same alternative signal stack region.
    Finally they get sigsegv.  It's an undesirable race condition.  Note that
    child threads created from NPTL pthread_create() also hit this conflict
    when the parent thread uses sigaltstack, without my patch.
    To fix this problem, this patch clears the child threads' sigaltstack
    information like exec().  This behavior follows the SUSv3 specification.
    In SUSv3, pthread_create() says "The alternate stack shall not be inherited
    (when new threads are initialized)".  It means that sigaltstack should be
    cleared when sigaltstack memory space is shared by cloned threads with
    Note that I chose "if (clone_flags & CLONE_SIGHAND)" line because:
      - If clone_flags line is not existed, fork() does not inherit sigaltstack.
      - CLONE_VM is another choice, but vfork() does not inherit sigaltstack.
      - CLONE_SIGHAND implies CLONE_VM, and it looks suitable.
      - CLONE_THREAD is another candidate, and includes CLONE_SIGHAND + CLONE_VM,
        but this flag has a bit different semantics.
    I decided to use CLONE_SIGHAND.
    [ Changed to test for CLONE_VM && !CLONE_VFORK after discussion --Linus ]
    Signed-off-by: default avatarGOTO Masanori <gotom@sanori.org>
    Cc: Roland McGrath <roland@redhat.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Acked-by: default avatarLinus Torvalds <torvalds@osdl.org>
    Cc: Ulrich Drepper <drepper@redhat.com>
    Cc: Jakub Jelinek <jakub@redhat.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>