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authorOleg Nesterov <oleg@tv-sign.ru>2008-02-08 13:19:11 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 18:22:27 +0100
commit430c623121ea88ca80595c99fdc63b7f8a803ae5 (patch)
tree8ada2d8287d07cabd64cc3614a6a643623046e5c /kernel/sys.c
parentmove daemonized kernel threads into the swapper's session (diff)
downloadlinux-430c623121ea88ca80595c99fdc63b7f8a803ae5.tar.xz
linux-430c623121ea88ca80595c99fdc63b7f8a803ae5.zip
start the global /sbin/init with 0,0 special pids
As Eric pointed out, there is no problem with init starting with sid == pgid == 0, and this was historical linux behavior changed in 2.6.18. Remove kernel_init()->__set_special_pids(), this is unneeded and complicates the rules for sys_setsid(). This change and the previous change in daemonize() mean that /sbin/init does not need the special "session != 1" hack in sys_setsid() any longer. We can't remove this check yet, we should cleanup copy_process(CLONE_NEWPID) first, so update the comment only. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sys.c')
-rw-r--r--kernel/sys.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index c326d6dceee3..7de9c984f696 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1054,12 +1054,11 @@ asmlinkage long sys_setsid(void)
if (group_leader->signal->leader)
goto out;
- /* Fail if a process group id already exists that equals the proposed
- * session id.
+ /* Fail if a process group id already exists that equals the
+ * proposed session id.
*
- * Don't check if session == 1 because kernel threads and CLONE_NEWPID
- * tasks use this session id and so the check will always fail and make
- * it so init cannot successfully call setsid.
+ * Don't check if session == 1, clone(CLONE_NEWPID) creates
+ * this group/session beforehand.
*/
if (session != 1 && pid_task(sid, PIDTYPE_PGID))
goto out;