Date: Fri, 12 Oct 2018 01:15:01 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Jann Horn <jannh@...gle.com> cc: Kees Cook <keescook@...omium.org>, Andy Lutomirski <luto@...nel.org>, kristen@...ux.intel.com, Kernel Hardening <kernel-hardening@...ts.openwall.com>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>, the arch/x86 maintainers <x86@...nel.org>, kernel list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] x86: entry: flush the cache if syscall error On Thu, 11 Oct 2018, Jann Horn wrote: > On Thu, Oct 11, 2018 at 10:56 PM Kees Cook <keescook@...omium.org> wrote: > > Seems like just changing this with "ax == 0" into "ax >= 0" would solve that? > > As spender points out on twitter > (https://twitter.com/grsecurity/status/1050497259937370118 - thanks, > spender!), struct pt_regs stores register values as "unsigned long", > and so you'll need to use something like IS_ERR_VALUE(). Ha, so it's not only me who noticed, but then I'm not reading twitter... Thanks, tglx
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