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[PATCH] replace cad_pid by a struct pid

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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 <clg@fr.ibm.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Cedric Le Goater 2006-10-02 02:19:00 -07:00 • committed by Linus Torvalds
parent 1a657f78dc
commit 9ec52099e4
11 changed files with 48 additions and 16 deletions
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6
kernel/sys.c
View file

@ -92,7 +92,8 @@ EXPORT_SYMBOL(fs_overflowgid);
*/
int C_A_D = 1;
int cad_pid = 1;
struct pid *cad_pid;
EXPORT_SYMBOL(cad_pid);
/*
* Notifier list for kernel code which wants to be called
@ -773,10 +774,9 @@ void ctrl_alt_del(void)
if (C_A_D)
schedule_work(&cad_work);
else
kill_proc(cad_pid, SIGINT, 1);
kill_cad_pid(SIGINT, 1);
}
/*
* Unprivileged users may change the real gid to the effective gid
* or vice versa. (BSD-style)