From 9ec52099e4b8678a60e9f93e41ad87885d64f3e6 Mon Sep 17 00:00:00 2001 From: Cedric Le Goater Date: Mon, 2 Oct 2006 02:19:00 -0700 Subject: [PATCH] replace cad_pid by a struct pid There are a few places in the kernel where the init task is signaled. The ctrl+alt+del sequence is one them. It kills a task, usually init, using a cached pid (cad_pid). This patch replaces the pid_t by a struct pid to avoid pid wrap around problem. The struct pid is initialized at boot time in init() and can be modified through systctl with /proc/sys/kernel/cad_pid [ I haven't found any distro using it ? ] It also introduces a small helper routine kill_cad_pid() which is used where it seemed ok to use cad_pid instead of pid 1. [akpm@osdl.org: cleanups, build fix] Signed-off-by: Cedric Le Goater Cc: Eric W. Biederman Cc: Martin Schwidefsky Cc: Paul Mackerras Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- init/main.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'init/main.c') diff --git a/init/main.c b/init/main.c index a49b00235bda..ee123243fb53 100644 --- a/init/main.c +++ b/init/main.c @@ -721,6 +721,8 @@ static int init(void * unused) */ child_reaper = current; + cad_pid = task_pid(current); + smp_prepare_cpus(max_cpus); do_pre_smp_initcalls(); -- cgit v1.2.3