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authorOleg Nesterov <oleg@tv-sign.ru>2008-02-08 04:19:11 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:27 -0800
commit430c623121ea88ca80595c99fdc63b7f8a803ae5 (patch)
tree8ada2d8287d07cabd64cc3614a6a643623046e5c
parent297bd42b15daed02453ff59ce6d31216a58b0398 (diff)
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>
-rw-r--r--init/main.c1
-rw-r--r--kernel/sys.c9
2 files changed, 4 insertions, 6 deletions
diff --git a/init/main.c b/init/main.c
index 9a5b18c0a63..ed9747f00ec 100644
--- a/init/main.c
+++ b/init/main.c
@@ -833,7 +833,6 @@ static int __init kernel_init(void * unused)
*/
init_pid_ns.child_reaper = current;
- __set_special_pids(task_pid(current));
cad_pid = task_pid(current);
smp_prepare_cpus(setup_max_cpus);
diff --git a/kernel/sys.c b/kernel/sys.c
index c326d6dceee..7de9c984f69 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;