[PATCH] ptrace: ptrace_attach: use send_sig_info() instead force_sig_specific()

[Oleg Nesterov]

(depends on signals-send_sig_info-dont-take-tasklist_lock.patch)

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@xxxxxxxxxx>

--- 25/kernel/ptrace.c~5_PTRACE_STOP_NO_FORCE	2008-03-16 18:33:02.000000000 +0300
+++ 25/kernel/ptrace.c	2008-03-18 19:15:54.000000000 +0300
@@ -217,8 +217,7 @@ 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);

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