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Date: Wed, 4 May 2022 13:17:25 -0700 From: Sami Tolvanen <samitolvanen@...gle.com> To: Mark Rutland <mark.rutland@....com> Cc: LKML <linux-kernel@...r.kernel.org>, Kees Cook <keescook@...omium.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Peter Zijlstra <peterz@...radead.org>, X86 ML <x86@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 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 00/21] KCFI support On Wed, May 4, 2022 at 9:41 AM Sami Tolvanen <samitolvanen@...gle.com> wrote: > > Hi Mark, > > On Wed, May 4, 2022 at 9:18 AM Mark Rutland <mark.rutland@....com> wrote: > > I wanted to give this a spin on arm64, but I'm seeing some very odd toolchain > > behaviour. I'm not sure if I've done something wrong, or if I'm just hitting an > > edge-case, but it looks like using -fsanitize=kcfi causes the toolchain to hit > > out-of-memory errors and other issues which look like they could be memory > > corruption. > > Thanks for the detailed bug report! It definitely looks like something > is wrong with the recent switch from std::string to Twine in the Clang > code. I didn't see this issue when compiling the arm64 kernel, but > I'll take a closer look and see if I can reproduce it. I was able to reproduce this by turning off assertions in Clang. It seems to work fine with -DLLVM_ENABLE_ASSERTIONS=ON. I'll go fix. Sami
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