linux-hardening - Re: [PATCH v5 00/22] KCFI support

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Date:   Mon, 26 Sep 2022 10:20:30 -0700
From:   Kees Cook <keescook@...omium.org>
To:     samitolvanen@...gle.com, peterz@...radead.org
Cc:     Kees Cook <keescook@...omium.org>, ndesaulniers@...gle.com,
        linux-arm-kernel@...ts.infradead.org, will@...nel.org,
        joao@...rdrivepizza.com, nathan@...nel.org, sedat.dilek@...il.com,
        llvm@...ts.linux.dev, mark.rutland@....com,
        linux-hardening@...r.kernel.org,
        Josh Poimboeuf <jpoimboe@...nel.org>, catalin.marinas@....com,
        rostedt@...dmis.org, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 00/22] KCFI support

On Thu, 8 Sep 2022 14:54:42 -0700, Sami Tolvanen wrote:
> KCFI is a forward-edge control-flow integrity scheme in the upcoming
> Clang 16 release, which is more suitable for kernel use than the
> existing CFI scheme used by CONFIG_CFI_CLANG. KCFI doesn't require
> LTO, doesn't alter function references to point to a jump table, and
> won't break function address equality.
> 
> This series replaces the current arm64 CFI implementation with KCFI
> and adds support for x86_64.
> 
> [...]

I assume that Peter's Ack means I should carry the tree, so, to that end:

Applied to for-next/kcfi, thanks!

[01/22] treewide: Filter out CC_FLAGS_CFI
        https://git.kernel.org/kees/c/f143ff397a3f
[02/22] scripts/kallsyms: Ignore __kcfi_typeid_
        https://git.kernel.org/kees/c/d0f9562ee43a
[03/22] cfi: Remove CONFIG_CFI_CLANG_SHADOW
        https://git.kernel.org/kees/c/9fca7115827b
[04/22] cfi: Drop __CFI_ADDRESSABLE
        https://git.kernel.org/kees/c/92efda8eb152
[05/22] cfi: Switch to -fsanitize=kcfi
        https://git.kernel.org/kees/c/89245600941e
[06/22] cfi: Add type helper macros
        https://git.kernel.org/kees/c/e84e008e7b02
[07/22] lkdtm: Emit an indirect call for CFI tests
        https://git.kernel.org/kees/c/cf90d0383560
[08/22] psci: Fix the function type for psci_initcall_t
        https://git.kernel.org/kees/c/44f665b69c67
[09/22] arm64: Add types to indirect called assembly functions
        https://git.kernel.org/kees/c/c50d32859e70
[10/22] arm64: Add CFI error handling
        https://git.kernel.org/kees/c/b26e484b8bb3
[11/22] arm64: Drop unneeded __nocfi attributes
        https://git.kernel.org/kees/c/5f20997c194e
[12/22] init: Drop __nocfi from __init
        https://git.kernel.org/kees/c/5dbbb3eaa2a7
[13/22] treewide: Drop function_nocfi
        https://git.kernel.org/kees/c/607289a7cd7a
[14/22] treewide: Drop WARN_ON_FUNCTION_MISMATCH
        https://git.kernel.org/kees/c/4b24356312fb
[15/22] treewide: Drop __cficanonical
        https://git.kernel.org/kees/c/5659b598b4dc
[16/22] objtool: Preserve special st_shndx indexes in elf_update_symbol
        https://git.kernel.org/kees/c/5141d3a06b2d
[17/22] objtool: Disable CFI warnings
        https://git.kernel.org/kees/c/3c68a92d17ad
[18/22] kallsyms: Drop CONFIG_CFI_CLANG workarounds
        https://git.kernel.org/kees/c/dfb352ab1162
[19/22] x86/tools/relocs: Ignore __kcfi_typeid_ relocations
        https://git.kernel.org/kees/c/ca7e10bff196
[20/22] x86: Add types to indirectly called assembly functions
        https://git.kernel.org/kees/c/ccace936eec7
[21/22] x86/purgatory: Disable CFI
        https://git.kernel.org/kees/c/a4b7a12c5594
[22/22] x86: Add support for CONFIG_CFI_CLANG
        https://git.kernel.org/kees/c/3c516f89e17e

-- 
Kees Cook