Date: Thu, 4 Apr 2019 10:03:58 -0700 From: Kees Cook <keescook@...omium.org> To: "Reshetova, Elena" <elena.reshetova@...el.com> Cc: Andy Lutomirski <luto@...nel.org>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, Andy Lutomirski <luto@...capital.net>, Josh Poimboeuf <jpoimboe@...hat.com>, Jann Horn <jannh@...gle.com>, "Perla, Enrico" <enrico.perla@...el.com>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Greg KH <gregkh@...uxfoundation.org> Subject: Re: [RFC PATCH] x86/entry/64: randomize kernel stack offset upon syscall On Thu, Apr 4, 2019 at 4:41 AM Reshetova, Elena <elena.reshetova@...el.com> wrote: > What I still don't fully understand here (due to my little knowledge of > compilers) and afraid of is that the asm code that alloca generates (see my version) > and the alignment might differ on the different targets, etc. I guess it's possible, but for x86_64, since appears to be consistent. > If you tried it on yours, can you send me the asm code that it produced for you? > Is it different from mine? You can compare compiler outputs here. Here's gcc vs clang for this code: https://godbolt.org/z/WJSbN8 You can adjust compiler versions, etc. -- Kees Cook
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