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From: Andrew Morton <akpm@linux-foundation.org>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: linux-kernel@vger.kernel.org, Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH] ELF: fix overflow in total mapping size calculation
Date: Tue, 5 Oct 2021 17:21:29 -0700	[thread overview]
Message-ID: <20211005172129.4092cc4148bbcac36a128b55@linux-foundation.org> (raw)
In-Reply-To: <YVmd7D0M6G/DcP4O@localhost.localdomain>

On Sun, 3 Oct 2021 15:11:24 +0300 Alexey Dobriyan <adobriyan@gmail.com> wrote:

> Kernel assumes that ELF program headers are ordered by mapping address,
> but doesn't enforce it. It is possible to make mapping size extremely huge
> by simply shuffling first and last PT_LOAD segments.
> 
> As long as PT_LOAD segments do not overlap, it is silly to require
> sorting by v_addr anyway because mmap() doesn't care.
> 
> Don't assume PT_LOAD segments are sorted and calculate min and max
> addresses correctly.

It sounds good, but why do I have the feeling this will explode in some
unexpected fashion?  Because it's elf, and that's what it does :(


  reply	other threads:[~2021-10-06  0:21 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-03 12:11 [PATCH] ELF: fix overflow in total mapping size calculation Alexey Dobriyan
2021-10-06  0:21 ` Andrew Morton [this message]
2021-10-07 17:13   ` Alexey Dobriyan
2021-10-06  2:31 ` Kees Cook
2021-10-07 17:20   ` Alexey Dobriyan
2021-10-07 17:40     ` Kees Cook
2021-10-07 18:31       ` Alexey Dobriyan

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