linux-hardening - Re: [RFC/RFT] CFI: Add support for gcc CFI in aarch64

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Date:   Sun, 18 Dec 2022 22:38:09 -0800
From:   Dan Li <ashimida.1990@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Marco Elver <elver@...gle.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Song Liu <song@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uros Bizjak <ubizjak@...il.com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Aaron Tomlin <atomlin@...hat.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Yuntao Wang <ytcoode@...il.com>,
        Changbin Du <changbin.du@...el.com>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: Re: [RFC/RFT] CFI: Add support for gcc CFI in aarch64

+ Cc: linux-hardening@...r.kernel.org
On 12/18, Dan Li wrote:
> Based on Sami's patch[1], this patch makes the corresponding kernel
> configuration of CFI available when compiling the kernel with the gcc[2].
> 
> The code after enabling cfi is as follows:
> 
> int (*p)(void);
> int func (int)
> {
> 	p();
> }
> 
> __cfi_func:
>         .4byte 0x439d3502
> func:
>         ......
>         adrp    x0, p
>         add     x0, x0, :lo12:p
>         mov     w1, 23592
>         movk    w1, 0x4601, lsl 16
>         cmp     w0, w1
>         beq     .L2
>         ......
>         bl      cfi_check_failed
> .L2:
>         blr     x19
>         ret
> 
> In the compiler part[4], there are some differences from Sami's
> implementation[3], mainly including: