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Date: Mon, 2 May 2022 08:20:05 -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 21/21] x86: Add support for CONFIG_CFI_CLANG On Sat, Apr 30, 2022 at 2:24 AM Peter Zijlstra <peterz@...radead.org> wrote: > > On Fri, Apr 29, 2022 at 01:36:44PM -0700, Sami Tolvanen wrote: > > - if (report_bug(regs->ip, regs) == BUG_TRAP_TYPE_WARN) { > > + if (report_bug(regs->ip, regs) == BUG_TRAP_TYPE_WARN || > > + report_cfi(regs->ip, regs) == BUG_TRAP_TYPE_WARN) { > > This way you'll first get a BUG splat and then tack on the CFI thing. The CFI ud2 isn't in the bug table, which means find_bug returns BUG_TRAP_TYPE_NONE and report_bug bails out before printing out anything. Sami
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