Re: [do_execve] attempted to set unsupported pgprot

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To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Fengguang Wu <fengguang.wu@xxxxxxxxx>
Subject: Re: [do_execve] attempted to set unsupported pgprot
From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Date: Thu, 19 Apr 2018 14:26:15 -0700
Cc: Linux Memory Management List <linux-mm@xxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Serge Hallyn <serge@xxxxxxxxxx>, James Morris <james.l.morris@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, lkp@xxxxxx
In-reply-to: <20180418125916.a8be1fac1ac017f41a10f0fb@linux-foundation.org>
References: <20180418135933.t3dyszi2phhsvaah@wfg-t540p.sh.intel.com> <20180418125916.a8be1fac1ac017f41a10f0fb@linux-foundation.org>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 04/18/2018 12:59 PM, Andrew Morton wrote:
> Dave, fb43d6cb91ef57 ("x86/mm: Do not auto-massage page protections")
> looks like a culprit?

This looks like a problem when a 32-bit kernel runs on hardware without
NX support.  I'm digging into it but haven't found a root cause yet.

References:
- [do_execve] attempted to set unsupported pgprot
  - From: Fengguang Wu
- Re: [do_execve] attempted to set unsupported pgprot
  - From: Andrew Morton

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