linux-kernel - Re: [PATCH] exec: fix linux_binprm::exec in transfer_args_to

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Date: Thu, 21 Mar 2024 20:18:48 -0700
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org,
	Max Filippov <jcmvbkbc@...il.com>
Cc: Kees Cook <keescook@...omium.org>,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	Eric Biederman <ebiederm@...ssion.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Rich Felker <dalias@...c.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH] exec: fix linux_binprm::exec in transfer_args_to_stack()

On Wed, 20 Mar 2024 11:26:07 -0700, Max Filippov wrote:
> In NUMMU kernel the value of linux_binprm::p is the offset inside the
> temporary program arguments array maintained in separate pages in the
> linux_binprm::page. linux_binprm::exec being a copy of linux_binprm::p
> thus must be adjusted when that array is copied to the user stack.
> Without that adjustment the value passed by the NOMMU kernel to the ELF
> program in the AT_EXECFN entry of the aux array doesn't make any sense
> and it may break programs that try to access memory pointed to by that
> entry.
> 
> [...]

Applied to for-next/execve, thanks!

[1/1] exec: fix linux_binprm::exec in transfer_args_to_stack()
      https://git.kernel.org/kees/c/2aea94ac14d1

Take care,

-- 
Kees Cook