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Message-ID: <20160917020051.GD2543@pc.thejh.net>
Date: Sat, 17 Sep 2016 04:00:51 +0200
From: Jann Horn <jann@...jh.net>
To: Andy Lutomirski <luto@...nel.org>
Cc: x86@...nel.org, Borislav Petkov <bp@...en8.de>,
linux-kernel@...r.kernel.org, Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH 09/12] x86/process: Pin the target stack in get_wchan()
On Tue, Sep 13, 2016 at 02:29:29PM -0700, Andy Lutomirski wrote:
> This will prevent a crash if get_wchan() runs after the task stack
> is freed.
I think I found some more stuff. Have a look at KSTK_EIP() and KSTK_ESP(), I think
they read from the saved userspace registers area at the top of the kernel stack?
Used on remote processes in:
vma_is_stack_for_task() (via /proc/$pid/maps)
do_task_stat() (/proc/$pid/stat)
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