linux-kernel - Re: [patch 00/38] x86/retbleed: Call depth tracking mitigation

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Message-ID: <20220720135016.3178ffc6@gandalf.local.home>
Date:   Wed, 20 Jul 2022 13:50:16 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Joao Moreira <joao.moreira@...el.com>,
        Joseph Nuzman <joseph.nuzman@...el.com>,
        Juergen Gross <jgross@...e.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [patch 00/38] x86/retbleed: Call depth tracking mitigation

On Wed, 20 Jul 2022 19:24:32 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> There's a patch for that:
> 
>   https://lkml.kernel.org/r/20220713213819.460771-1-keescook@chromium.org
> 
> it seems to have gotten lost, let me go queue that.

With this applied, I now have:

[    2.442118] MDS: Vulnerable: Clear CPU buffers attempted, no microcode
[    2.443117] SRBDS: Vulnerable: No microcode
[    2.463339] ------------[ cut here ]------------
[    2.464117] missing return thunk: lkdtm_rodata_do_nothing+0x0/0x8-lkdtm_rodata_do_nothing+0x5/0x8: e9 00 00 00 00
[    2.464128] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/alternative.c:558 apply_returns+0xcb/0x219
[    2.466117] Modules linked in:
[    2.467117] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc7-test+ #66
[    2.468117] Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
[    2.469117] RIP: 0010:apply_returns+0xcb/0x219
[    2.470117] Code: 80 3d d1 32 06 02 00 75 59 49 89 d8 b9 05 00 00 00 4c 89 e2 48 89 de 48 c7 c7 63 98 b4 ae c6 05 b3 32 06 02 01 e8 f8 4f fb 00 <0f> 0b eb 34 44 0f b6 65 a2 31 c0 48 8d 55 c1 c6 45 c0 c3 48 89 d7
[    2.471117] RSP: 0000:ffffffffaee03df0 EFLAGS: 00010286
[    2.472117] RAX: 0000000000000000 RBX: ffffffffae73e8a8 RCX: ffffffffae056641
[    2.473117] RDX: ffffffffaee03d78 RSI: 0000000000000001 RDI: 00000000ffffffff
[    2.474117] RBP: ffffffffaee03ea8 R08: 0000000000000000 R09: 00000000ffffffea
[    2.475117] R10: 000000000000001f R11: ffffffffaee03a4d R12: ffffffffae73e8ad
[    2.476117] R13: ffffffffaf550d30 R14: 0000000000000000 R15: ffffffffaee32138
[    2.477117] FS:  0000000000000000(0000) GS:ffff9d71d6400000(0000) knlGS:0000000000000000
[    2.478117] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033


-- Steve