linux-kernel - Re: [PATCH v3 0/3] fs/binfmts: Improve handling of loops

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Message-ID: <20130806211150.GH2280@outflux.net>
Date:	Tue, 6 Aug 2013 14:11:50 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Zach Levis <zml@...ux.vnet.ibm.com>
Cc:	akpm@...ux-foundation.org, oleg@...hat.com,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, dan.carpenter@...cle.com
Subject: Re: [PATCH v3 0/3] fs/binfmts: Improve handling of loops

Hi Zach,

I like the idea behind these clean ups. Thanks for working on them!

On Fri, Aug 02, 2013 at 04:21:40PM -0700, Zach Levis wrote:
> This v3 is based off Oleg's changes from "exec: more cleanups" and
> "exec: minor cleanups + minor fix"

I would echo all of Oleg's comments on the series so far. Additionally,
please use "scripts/checkpatch.pl" for checking your patches for common
errors (see item 4 in Documentation/SubmittingPatches). I see a number
of problems that are detected by the tool:

WARNING: line over 80 characters
#52: FILE: fs/exec.c:1403:
+               if (retval == -ELOOP && bprm->recursion_depth == 0) { /* cur, previous */

...

ERROR: trailing statements should be on next line
#269: FILE: fs/binfmt_em86.c:70:
+               if (retval < 0) return retval;

...

ERROR: "(foo*)" should be "(foo *)"
#341: FILE: fs/binfmt_flat.c:791:
+       memset((void*)(datapos + data_len), 0, bss_len +

etc.

After that, be sure to use "scripts/get_maintainer.pl" for generating
your CC list (see item 5 in SubmittingPatches; I initially missed this
series -- adding more CCs for people that have touched the code can help
with your reviews).

Also, you only need to include a single Signed-off-by line for
yourself. :)

> It incorporates Oleg and Andrew's suggestions and takes care
> of the issue from Dan's patch "fs/binfmts: double unlock in
> search_binary_handler()"

In the commit message, can you include some examples of how to generate
the loops you're encountering? This helps people understand why you're
doing what you're doing and provides a way for people to reproduce the
conditions themselves.

Thanks,

-Kees

-- 
Kees Cook
Chrome OS Security
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