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Date:   Sat, 19 Dec 2020 20:33:14 +0100
From:   Oleg Nesterov <>
To:     Pedro Alves <>
Cc:     "Eric W. Biederman" <>,
        Andrew Morton <>,
        Eugene Syromiatnikov <>,
        Jan Kratochvil <>,
        Linus Torvalds <>,
        Mathieu Desnoyers <>,
        Michael Kerrisk <>,
        Simon Marchi <>,
Subject: Re: [RFC PATCH] ptrace: make ptrace() fail if the tracee changed its
 pid unexpectedly

On 12/19, Pedro Alves wrote:
> BTW, the problem was discovered by Simon Marchi when he tried to write
> a GDB testcase for a multi-threaded exec scenario:

OOPS! Sorry Simon, yes I forgot to add reported-by. Andrew, or Eric, if
you take this patch, could you also add

	Reported-by: Simon Marchi <>

> I've went through GDB's code looking for potential issues with the change and whether
> it would affect GDBs already in the wild.  Tricky corner cases abound, but I think
> we're good.  Feel free to add my ack:
> Acked-by: Pedro Alves <>



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