ptrace: ptrace_attach: use send_sig_info() instead force_sig_specific()

Nobody can block/ignore SIGSTOP, no need to use force_sig_specific() in
ptrace_attach.  Use the "regular" send_sig_info().

With this patch stracing of /sbin/init doesn't clear its SIGNAL_UNKILLABLE,
but not that this makes ptracing of init safe.

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>

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index ce66d66881fdaf935b2010ba84ec8b623686420c..5f8d452e8111b7a2e67b1de14b50ec544c22bfa1 100644 (file)
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -208,8 +208,7 @@ repeat:
 
        __ptrace_link(task, current);
 
-       force_sig_specific(SIGSTOP, task);
-
+       send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
 bad:
        write_unlock_irqrestore(&tasklist_lock, flags);
        task_unlock(task);