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kill PT_ATTACHED

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Since the patch

	"Fix ptrace_attach()/ptrace_traceme()/de_thread() race"
	commit f5b40e363a

we set PT_ATTACHED and change child->parent "atomically" wrt task_list lock.

This means we can remove the checks like "PT_ATTACHED && ->parent != ptracer"
which were needed to catch the "ptrace attach is in progress" case.  We can
also remove the flag itself since nobody else uses it.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-02-08 04:18:58 -08:00 • committed by Linus Torvalds
parent 01b8b07a5d
commit 6b39c7bfbd
4 changed files with 3 additions and 22 deletions
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13
kernel/exit.c
View file

@ -1514,18 +1514,7 @@ static int wait_task_continued(struct task_struct *p, int noreap,
static inline int my_ptrace_child(struct task_struct *p)
{
if (!(p->ptrace & PT_PTRACED))
return 0;
if (!(p->ptrace & PT_ATTACHED))
return 1;
/*
* This child was PTRACE_ATTACH'd. We should be seeing it only if
* we are the attacher. If we are the real parent, this is a race
* inside ptrace_attach. It is waiting for the tasklist_lock,
* which we have to switch the parent links, but has already set
* the flags in p->ptrace.
*/
return (p->parent != p->real_parent);
return p->ptrace & PT_PTRACED;
}
static long do_wait(pid_t pid, int options, struct siginfo __user *infop,