linux-kernel - Re: [PATCH 6/7] exec: Factor bprm_stack_limits out of prepare_arg

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Date:   Tue, 14 Jul 2020 14:41:05 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-fsdevel@...r.kernel.org,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        linux-security-module@...r.kernel.org,
        "Serge E. Hallyn" <serge@...lyn.com>,
        James Morris <jmorris@...ei.org>,
        Kentaro Takeda <takedakn@...data.co.jp>,
        Casey Schaufler <casey@...aufler-ca.com>,
        John Johansen <john.johansen@...onical.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 6/7] exec: Factor bprm_stack_limits out of
 prepare_arg_pages

On Tue, Jul 14, 2020 at 08:31:03AM -0500, Eric W. Biederman wrote:
> 
> In preparation for implementiong kernel_execve (which will take kernel
> pointers not userspace pointers) factor out bprm_stack_limits out of
> prepare_arg_pages.  This separates the counting which depends upon the
> getting data from userspace from the calculations of the stack limits
> which is usable in kernel_execve.
> 
> The remove prepare_args_pages and compute bprm->argc and bprm->envc
> directly in do_execveat_common, before bprm_stack_limits is called.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook