[PATCH] setpgid: should not accept ptraced childs
sys_setpgid() allows to change ->pgrp of ptraced childs. '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>
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@ -1114,7 +1114,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
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if (!thread_group_leader(p))
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if (!thread_group_leader(p))
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goto out;
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goto out;
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if (p->parent == current || p->real_parent == group_leader) {
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if (p->real_parent == group_leader) {
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err = -EPERM;
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err = -EPERM;
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if (p->signal->session != group_leader->signal->session)
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if (p->signal->session != group_leader->signal->session)
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goto out;
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goto out;
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