linux-kernel - Re: [RFC PATCH v3 0/2] selftests/x86: sysret

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]

Date:   Wed, 25 Jan 2023 10:27:18 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     "H. Peter Anvin" <hpa@...or.com>
Cc:     "Li, Xin3" <xin3.li@...el.com>, x86 Mailing List <x86@...nel.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        Brian Gerst <brgerst@...il.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Shuah Khan <shuah@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linux Kselftest Mailing List 
        <linux-kselftest@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v3 0/2] selftests/x86: sysret_rip update for FRED
 system

On Tue, Jan 24, 2023 at 01:37:43PM -0800, H. Peter Anvin wrote:
> On January 24, 2023 1:32:14 PM PST, "Li, Xin3" <xin3.li@...el.com> wrote:
> >> From: Ammar Faizi <ammarfaizi2@...weeb.org>
> >> 
> >> This is an RFC patchset v3:
> >> sysret_rip test update for Intel FRED architecture.
> >> 
> >> Xin Li reported sysret_rip test fails at:
> >> 
> >>         assert(ctx->uc_mcontext.gregs[REG_EFL] ==
> >>                ctx->uc_mcontext.gregs[REG_R11]);
> >
> >On FRED systems, flags is 0x200a93 and r11 is 0xfeedfacedeadbeef here.
> >
> >We need to remove or change this assertion, maybe:
> >  assert(ctx->uc_mcontext.gregs[REG_EFL] == ctx->uc_mcontext.gregs[REG_R11] ||
> >         r11_sentinel == ctx->uc_mcontext.gregs[REG_R11]);
> >
>
> This should use check_regs_result() – which is exactly the reason I made that a separate function.

Fixed in v4.

-- 
Ammar Faizi