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Open Source and information security mailing list archives
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Date: Mon, 16 May 2022 23:44:14 +0200 From: Peter Zijlstra <peterz@...radead.org> To: David Laight <David.Laight@...LAB.COM> Cc: 'Sami Tolvanen' <samitolvanen@...gle.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Kees Cook <keescook@...omium.org>, Josh Poimboeuf <jpoimboe@...hat.com>, "x86@...nel.org" <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-hardening@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "llvm@...ts.linux.dev" <llvm@...ts.linux.dev> Subject: Re: [RFC PATCH v2 20/21] x86: Add support for CONFIG_CFI_CLANG On Mon, May 16, 2022 at 09:32:55PM +0000, David Laight wrote: > > The compiler always generates this specific instruction sequence. > > Yes, but there are several ways to encode 'cmpl imm,-6(reg)'. Yes, but we don't care. This *always* uses the 32bit immediate form. Even if the immediate is small.
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