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Message-ID: <CAGXu5jJtuut1E4DKB=AVs-pq8H9Jvwr3Ve6eskraBL3ekfUzqA@mail.gmail.com> Date: Wed, 11 Jul 2018 19:06:25 -0700 From: Kees Cook <keescook@...omium.org> To: Laura Abbott <labbott@...hat.com> Cc: Will Deacon <will.deacon@....com>, Mark Rutland <mark.rutland@....com>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, LKML <linux-kernel@...r.kernel.org>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, Alexander Popov <alex.popov@...ux.com>, Catalin Marinas <catalin.marinas@....com> Subject: Re: [PATCH] arm64: Add support for STACKLEAK gcc plugin On Wed, Jul 11, 2018 at 6:45 PM, Laura Abbott <labbott@...hat.com> wrote: >> +#ifdef CONFIG_GCC_PLUGIN_STACKLEAK >> +#define MIN_STACK_LEFT 256 >> + >> +void __used stackleak_check_alloca(unsigned long size) >> +{ >> + unsigned long sp, stack_left; >> + >> + sp = current_stack_pointer; >> + >> + stack_left = sp & (THREAD_SIZE - 1); >> + BUG_ON(stack_left < MIN_STACK_LEFT || >> + size >= stack_left - MIN_STACK_LEFT); >> +} >> +EXPORT_SYMBOL(stackleak_check_alloca); >> +#endif > > > I think the conclusion was this needs to be re-written to account > for the different stack sizes in the same way as x86. Oh, whoops! Sorry, I missed that fork of the thread. :) -Kees -- Kees Cook Pixel Security
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