linux-kernel - Re: Regression: NULL pointer dereference after NFS_V4_2_READ

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <86d8e252-975f-5d48-4567-0911d5ef9a44@linaro.org>
Date:   Sat, 10 Jun 2023 12:15:27 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Anna Schumaker <schumaker.anna@...il.com>
Cc:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        linux-nfs <linux-nfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: Regression: NULL pointer dereference after NFS_V4_2_READ_PLUS
 (commit 7fd461c47)

On 06/03/2023 18:09, Anna Schumaker wrote:
> Hi Krzysztof,
> 
> On Tue, Feb 14, 2023 at 6:02 AM Krzysztof Kozlowski
> <krzysztof.kozlowski@...aro.org> wrote:
>>
>> On 12/02/2023 15:05, Anna Schumaker wrote:
>>>>> From ac2d6c501dbcdb306480edaee625b5496f1fb4f5 Mon Sep 17 00:00:00 2001
>>>>> From: Anna Schumaker <Anna.Schumaker@...app.com>
>>>>> Date: Fri, 10 Feb 2023 15:50:22 -0500
>>>>> Subject: [PATCH] NFSv4.2: Rework scratch handling for READ_PLUS
>>>>>
>>>>
>>>> Patch is corrupted - maybe mail program reformatted it when sending:
>>>>
>>>> Applying: NFSv4.2: Rework scratch handling for READ_PLUS
>>>> error: corrupt patch at line 12
>>>> Patch failed at 0001 NFSv4.2: Rework scratch handling for READ_PLUS
>>>
>>> That's weird. I wasn't expecting gmail to reformat the patch but I
>>> guess it did. I've added it as an attachment so that shouldn't happen
>>> again.
>>
>> Still null ptr (built on 420b2d4 with your patch):
> 
> We're through the merge window and at rc1 now, so I can spend more
> time scratching my head over your bug again. We've come up with a
> patch (attached) that adds a bunch of printks to show us what the
> kernel thinks is going on. Do you mind trying it out and letting us
> know what gets printed out? You'll need to make sure
> CONFIG_NFS_V4_2_READ_PLUS is enabled when compiling the kernel.

The patch does not apply. I tried: v6.4-rc1, v6.4-rc5, next-20230609.

Best regards,
Krzysztof