linux-kernel - Re: [RFC 00/31] objtool, livepatch: Livepatch module generation

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: <CAPhsuW432TUgzvHS7kQ0RhpzjMHhkdcrDTBV0S=+PuooVFd5WA@mail.gmail.com>
Date: Thu, 5 Sep 2024 14:34:36 -0700
From: Song Liu <song@...nel.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: live-patching@...r.kernel.org, linux-kernel@...r.kernel.org, 
	x86@...nel.org, Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com>, 
	Joe Lawrence <joe.lawrence@...hat.com>, Jiri Kosina <jikos@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>, Marcos Paulo de Souza <mpdesouza@...e.com>
Subject: Re: [RFC 00/31] objtool, livepatch: Livepatch module generation

On Thu, Sep 5, 2024 at 12:13 AM Josh Poimboeuf <jpoimboe@...nel.org> wrote:
>
> On Wed, Sep 04, 2024 at 09:14:00PM -0700, Josh Poimboeuf wrote:
>
> > +     if (!!nr_objs) {
>             ^^
>             oops
>
> Fixed version:

The fixed version works for the following cases with gcc-12:

1. no BTF, no IBT;
2. with BTF and CONFIG_MODULE_ALLOW_BTF_MISMATCH, no IBT;
3. with BTF and CONFIG_MODULE_ALLOW_BTF_MISMATCH, with IBT;

There is still some issue with BTF, so we need
CONFIG_MODULE_ALLOW_BTF_MISMATCH here.

But it appears to be mostly working.

OTOH, there are still some issues with LLVM ("symbol 'xxx' already
defined", etc.).

Thanks,
Song