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Date: Tue, 17 May 2022 13:25:58 -0700 From: Sami Tolvanen <samitolvanen@...gle.com> To: Peter Zijlstra <peterz@...radead.org> Cc: LKML <linux-kernel@...r.kernel.org>, Kees Cook <keescook@...omium.org>, Josh Poimboeuf <jpoimboe@...hat.com>, X86 ML <x86@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Joao Moreira <joao@...rdrivepizza.com>, Sedat Dilek <sedat.dilek@...il.com>, Steven Rostedt <rostedt@...dmis.org>, linux-hardening@...r.kernel.org, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, llvm@...ts.linux.dev Subject: Re: [RFC PATCH v2 00/21] KCFI support On Tue, May 17, 2022 at 1:58 AM Peter Zijlstra <peterz@...radead.org> wrote: > > On Fri, May 13, 2022 at 01:21:38PM -0700, Sami Tolvanen wrote: > > KCFI is a proposed forward-edge control-flow integrity scheme for > > Clang, 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. The latest LLVM patch is here: > > > > https://reviews.llvm.org/D119296 > > > > This RFC series replaces the current arm64 CFI implementation with > > KCFI and adds support for x86_64. > > You have some weird behaviour vs weak functions (I so hate those)... > > 100: 0000000000000980 9 FUNC LOCAL DEFAULT 2 __cfi_free_initmem > 233: 0000000000000989 35 FUNC WEAK DEFAULT 2 free_initmem > > With the result that on the final link: > > 179: 00000000000009b0 9 FUNC LOCAL DEFAULT 1 __cfi_free_initmem > 8689: 00000000000007f0 9 FUNC LOCAL DEFAULT 65 __cfi_free_initmem > 173283: 00000000000007f9 198 FUNC GLOBAL DEFAULT 65 free_initmem > > This is getting me objtool issues (I'll fix them) but perhaps it's > something you can do something about as well. Good catch, I'll fix this. Sami
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