linux-kernel - Re: [PATCH] security/commoncap: don't assume "setid" if all ids are identical

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: <CAKPOu+89=+SFk1hKGLheMtPq+K47E9FRCo1DBQo9zGMwW=Tr2w@mail.gmail.com>
Date: Fri, 9 May 2025 08:15:33 +0200
From: Max Kellermann <max.kellermann@...os.com>
To: sergeh@...nel.org
Cc: "Serge E. Hallyn" <serge@...lyn.com>, Andy Lutomirski <luto@...nel.org>, paul@...l-moore.com, 
	jmorris@...ei.org, kees@...nel.org, morgan@...nel.org, 
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Eric Biederman <ebiederm@...ssion.com>
Subject: Re: [PATCH] security/commoncap: don't assume "setid" if all ids are identical

On Fri, May 9, 2025 at 12:12 AM <sergeh@...nel.org> wrote:
> ABI stability is about the most important thing to Linus, so yes, if
> documentation and code disagree, then we should fix the documentation,
> except in the case where the current behavior just really is wrong
> or insecure.

It is insecure indeed (can be abused for LD_PRELOAD
attacks):https://lore.kernel.org/lkml/CAKPOu+8+1uVrDJHwmHJd2d46-N6AwjR4_bbtoSJS+sx6J=rkjg@mail.gmail.com/