linux-kernel - Re: [PATCH V6 6/8] x86/entry: Convert SWAPGS to swapgs and remove the definition of SWAPGS

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 for Android: free password hash cracker in your pocket

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

Message-ID: <YnEHRc9f4wEm7OUc@zn.tnic>
Date:   Tue, 3 May 2022 12:43:17 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Juergen Gross <jgross@...e.com>
Cc:     Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Lai Jiangshan <jiangshan.ljs@...group.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH V6 6/8] x86/entry: Convert SWAPGS to swapgs and remove
 the definition of SWAPGS

On Mon, May 02, 2022 at 07:56:16PM +0200, Borislav Petkov wrote:
> Ok, simpler asm, cool, let's do it then.

Yeah, just tried it, it needs more ifdeffery:

ld: arch/x86/entry/entry_64.o:/home/boris/kernel/linux/arch/x86/entry/entry_64.S:129: undefined reference to `xenpv_restore_regs_and_return_to_usermode'
ld: arch/x86/entry/entry_64_compat.o:(.altinstr_replacement+0x1): undefined reference to `xenpv_restore_regs_and_return_to_usermode'
make: *** [Makefile:1158: vmlinux] Error 1

Oh well.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette