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Fix ptrace self-attach rule

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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: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Linus Torvalds 2005-11-09 11:33:07 -08:00
parent ac111bfaa6
commit 28d838cc4d
1 changed files with 1 additions and 1 deletions
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2
kernel/ptrace.c
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@ -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)