Commit ee0acf90 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
Browse files

[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: default avatarOleg Nesterov <oleg@tv-sign.ru>
Cc: Oren Laadan <orenl@cs.columbia.edu>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 9a5d3023
......@@ -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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