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Commit 28d838cc authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Fix ptrace self-attach rule 



Before we did CLONE_THREAD, the way to check whether we were attaching
to ourselves was to just check "current == task", but with CLONE_THREAD
we should check that the thread group ID matches instead.

Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ac111bfa

kernel/ptrace.c

+1 −1
Original line number Diff line number Diff line
@@ -155,7 +155,7 @@ int ptrace_attach(struct task_struct *task) 
	retval = -EPERM;

	if (task->pid <= 1)

		goto bad;

	if (task == current)

	if (task->tgid == current->tgid)

		goto bad;

	/* the same process cannot be attached many times */

	if (task->ptrace & PT_PTRACED)