linux-kernel - Re: [PATCH v8 07/14] x86/cet/ibt: Add ENDBR to op-code-map

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Date:   Fri, 8 Nov 2019 15:19:40 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>, 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@...capital.net>,
        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>
Subject: Re: [PATCH v8 07/14] x86/cet/ibt: Add ENDBR to op-code-map

On 13/08/19 11:53 PM, Yu-cheng Yu wrote:
> Add control transfer terminating instructions:
> 
> ENDBR64/ENDBR32:
>     Mark a valid 64/32-bit control transfer endpoint.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
> ---
>  arch/x86/lib/x86-opcode-map.txt               | 13 +++++++++++--
>  tools/objtool/arch/x86/lib/x86-opcode-map.txt | 13 +++++++++++--
>  2 files changed, 22 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/lib/x86-opcode-map.txt b/arch/x86/lib/x86-opcode-map.txt
> index c5e825d44766..fbc53481bc59 100644
> --- a/arch/x86/lib/x86-opcode-map.txt
> +++ b/arch/x86/lib/x86-opcode-map.txt
> @@ -620,7 +620,16 @@ ea: SAVEPREVSSP (f3)
>  # Skip 0xeb-0xff
>  EndTable
>  
> -Table: 3-byte opcode 2 (0x0f 0x38)
> +Table: 3-byte opcode 2 (0x0f 0x1e)
> +Referrer:
> +AVXcode:
> +# Skip 0x00-0xf9
> +fa: ENDBR64 (f3)
> +fb: ENDBR32 (f3)

endbr32 and endbr64 have 2-byte opcodes (0F 1E) and a ModRM byte, so a new
Grp is needed

> +#skip 0xfc-0xff
> +EndTable
> +
> +Table: 3-byte opcode 3 (0x0f 0x38)
>  Referrer: 3-byte escape 1
>  AVXcode: 2
>  # 0x0f 0x38 0x00-0x0f
> @@ -804,7 +813,7 @@ f6: ADCX Gy,Ey (66) | ADOX Gy,Ey (F3) | MULX By,Gy,rDX,Ey (F2),(v) | WRSS Pq,Qq
>  f7: BEXTR Gy,Ey,By (v) | SHLX Gy,Ey,By (66),(v) | SARX Gy,Ey,By (F3),(v) | SHRX Gy,Ey,By (F2),(v)
>  EndTable
>  
> -Table: 3-byte opcode 3 (0x0f 0x3a)
> +Table: 3-byte opcode 4 (0x0f 0x3a)
>  Referrer: 3-byte escape 2
>  AVXcode: 3
>  # 0x0f 0x3a 0x00-0xff
> diff --git a/tools/objtool/arch/x86/lib/x86-opcode-map.txt b/tools/objtool/arch/x86/lib/x86-opcode-map.txt
> index c5e825d44766..fbc53481bc59 100644
> --- a/tools/objtool/arch/x86/lib/x86-opcode-map.txt
> +++ b/tools/objtool/arch/x86/lib/x86-opcode-map.txt
> @@ -620,7 +620,16 @@ ea: SAVEPREVSSP (f3)
>  # Skip 0xeb-0xff
>  EndTable
>  
> -Table: 3-byte opcode 2 (0x0f 0x38)
> +Table: 3-byte opcode 2 (0x0f 0x1e)
> +Referrer:
> +AVXcode:
> +# Skip 0x00-0xf9
> +fa: ENDBR64 (f3)
> +fb: ENDBR32 (f3)
> +#skip 0xfc-0xff
> +EndTable
> +
> +Table: 3-byte opcode 3 (0x0f 0x38)
>  Referrer: 3-byte escape 1
>  AVXcode: 2
>  # 0x0f 0x38 0x00-0x0f
> @@ -804,7 +813,7 @@ f6: ADCX Gy,Ey (66) | ADOX Gy,Ey (F3) | MULX By,Gy,rDX,Ey (F2),(v) | WRSS Pq,Qq
>  f7: BEXTR Gy,Ey,By (v) | SHLX Gy,Ey,By (66),(v) | SARX Gy,Ey,By (F3),(v) | SHRX Gy,Ey,By (F2),(v)
>  EndTable
>  
> -Table: 3-byte opcode 3 (0x0f 0x3a)
> +Table: 3-byte opcode 4 (0x0f 0x3a)
>  Referrer: 3-byte escape 2
>  AVXcode: 3
>  # 0x0f 0x3a 0x00-0xff
>