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Date:   Thu, 21 May 2020 12:08:23 -0700
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>
Subject: Re: [PATCH v10 00/26] Control-flow Enforcement: Shadow Stack

On Thu, 2020-05-21 at 13:50 -0500, Josh Poimboeuf wrote:
[...]
> 
> Thanks.  FYI, I got the following warning on an AMD system.
> 
> [   18.936979] get of unsupported state
> [   18.936989] WARNING: CPU: 251 PID: 1794 at arch/x86/kernel/fpu/xstate.c:919 get_xsave_addr+0x83/0x90
> [   18.949676] Modules linked in:
> [   18.952731] CPU: 251 PID: 1794 Comm: dracut-rootfs-g Not tainted 5.7.0-rc6+ #162
> [   18.960121] Hardware name: AMD Corporation DAYTONA_X/DAYTONA_X, BIOS RDY1005C 11/22/2019
> [   18.968198] RIP: 0010:get_xsave_addr+0x83/0x90
> [   18.972637] Code: 5b c3 48 83 c4 08 31 c0 5b c3 80 3d f9 c2 7a 01 00 75 bc 48 c7 c7 c4 cb 8f a9 89 74 24 04 c6 05 e5 c2 7a 01 01 e8 3f 49 0a 00 <0f> 0b 8b 74 24 04 eb 9d 31 c0 c3 66 90 0f 1f 44 00 00 48 89 fe 0f
> [   18.991373] RSP: 0018:ffffb8db103cfcd8 EFLAGS: 00010286
> [   18.996591] RAX: 0000000000000000 RBX: ffff947da1189440 RCX: 0000000000000000
> [   19.003715] RDX: 0000000000000000 RSI: ffffffffaa6809d8 RDI: ffffffffaa67e58c
> [   19.010839] RBP: ffff947da1188000 R08: 0000000468bb5e6c R09: 0000000000000018
> [   19.017962] R10: 0000000000000002 R11: 00000000000000f0 R12: ffffb8db103cfd20
> [   19.025087] R13: ffff947da1189400 R14: 0000000000000000 R15: 0000000000000007
> [   19.032211] FS:  00007f0a81b15740(0000) GS:ffff947dcf8c0000(0000) knlGS:0000000000000000
> [   19.040321] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   19.046057] CR2: 00007f0a81b156c0 CR3: 0000003fa125a000 CR4: 0000000000340ee0
> [   19.053183] Call Trace:
> [   19.055637]  cet_restore_signal+0x26/0xf0
> [   19.059649]  __fpu__restore_sig+0x4cc/0x6e0
> [   19.063832]  ? remove_wait_queue+0x20/0x60
> [   19.067928]  ? reuse_swap_page+0x6e/0x340
> [   19.071939]  restore_sigcontext+0x162/0x1b0
> [   19.076128]  ? recalc_sigpending+0x17/0x50
> [   19.080223]  ? __set_task_blocked+0x34/0xa0
> [   19.084401]  __do_sys_rt_sigreturn+0x92/0xde
> [   19.088675]  do_syscall_64+0x55/0x1b0
> [   19.092342]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [   19.097394] RIP: 0033:0x7f0a811389d1
> [   19.100970] Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 41 ba 08 00 00 00 b8 0e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 07 c3 66 0f 1f 44 00 00 48 8b 15 81 44 38 00
> [   19.119709] RSP: 002b:00007ffd643d5dd8 EFLAGS: 00000246
> [   19.124933] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f0a811389d1
> [   19.132056] RDX: 0000000000000000 RSI: 00007ffd643d5e60 RDI: 0000000000000002
> [   19.139182] RBP: 000055e140190e20 R08: 000055e14017a014 R09: 0000000000000001
> [   19.146307] R10: 0000000000000008 R11: 0000000000000246 R12: 000055e13f47e4e0
> [   19.153436] R13: 00007ffd643d5e60 R14: 0000000000000000 R15: 0000000000000000
> 

Thanks!  I will fix it.

Yu-cheng

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