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authorOleg Nesterov <oleg@tv-sign.ru>2006-01-08 01:03:53 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:14:01 -0800
commitee0acf90d320c29916ba8c5c1b2e908d81f5057d (patch)
treedef952e2e3ebf2b5ba10585055f12ef0cbed17f2 /kernel
parent9a5d3023e626a0baf86ac6b892c983b3db13f22b (diff)
downloadop-kernel-dev-ee0acf90d320c29916ba8c5c1b2e908d81f5057d.zip
op-kernel-dev-ee0acf90d320c29916ba8c5c1b2e908d81f5057d.tar.gz
[PATCH] setpgid: should work for sub-threads
setpgid(0, pgid) or setpgid(forked_child_pid, pgid) does not work unless the calling process is a thread_group_leader(). 'man setpgid' does not tell anything about that, so I consider this behaviour is a bug. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Oren Laadan <orenl@cs.columbia.edu> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sys.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index d8e49e6..43e5572 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1090,10 +1090,11 @@ asmlinkage long sys_times(struct tms __user * tbuf)
asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
{
struct task_struct *p;
+ struct task_struct *group_leader = current->group_leader;
int err = -EINVAL;
if (!pid)
- pid = current->pid;
+ pid = group_leader->pid;
if (!pgid)
pgid = pid;
if (pgid < 0)
@@ -1113,16 +1114,16 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
if (!thread_group_leader(p))
goto out;
- if (p->parent == current || p->real_parent == current) {
+ if (p->parent == current || p->real_parent == group_leader) {
err = -EPERM;
- if (p->signal->session != current->signal->session)
+ if (p->signal->session != group_leader->signal->session)
goto out;
err = -EACCES;
if (p->did_exec)
goto out;
} else {
err = -ESRCH;
- if (p != current)
+ if (p != group_leader)
goto out;
}
@@ -1134,7 +1135,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
struct task_struct *p;
do_each_task_pid(pgid, PIDTYPE_PGID, p) {
- if (p->signal->session == current->signal->session)
+ if (p->signal->session == group_leader->signal->session)
goto ok_pgid;
} while_each_task_pid(pgid, PIDTYPE_PGID, p);
goto out;
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