linux-kernel - Re: bug#77597: listxattr() should return ENOTSUP for sysfs / tmpfs entries, not 0

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Message-ID: <be46b324-db6c-4ebb-96c3-0280d32aac66@cs.ucla.edu>
Date: Sat, 31 May 2025 08:25:07 -0700
From: Paul Eggert <eggert@...ucla.edu>
To: Pádraig Brady <P@...igBrady.com>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 linux-security-module@...r.kernel.org,
 Stephen Smalley <stephen.smalley.work@...il.com>
Cc: 77597@...bugs.gnu.org, Rahul Sandhu <nvraxn@...il.com>
Subject: Re: bug#77597: listxattr() should return ENOTSUP for sysfs / tmpfs
 entries, not 0

On 2025-05-23 04:38, Pádraig Brady wrote:
> FYI this should be addressed with:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8b0ba61d

Thanks for letting me know, as this led me to further testing that found 
some other kernel bugs in this area, possibly introduced by that kernel 
commit. Please see:

"flistxattr with right size wrongly fails with ERANGE, breaking 'cp -a' 
etc" <https://bugzilla.redhat.com/show_bug.cgi?id=2369561>

The email thread starting at "[PATCH] Fix listxattr-related races and 
stack overflows" 
<https://lists.nongnu.org/archive/html/acl-devel/2025-05/msg00003.html>.