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Date: Mon, 6 Aug 2018 12:07:48 +0200
From: Florian Weimer <fweimer@...hat.com>
To: Ard Biesheuvel <ard.biesheuvel@...aro.org>,
 kernel-hardening@...ts.openwall.com
Cc: keescook@...omium.org, christoffer.dall@....com, will.deacon@....com,
 catalin.marinas@....com, mark.rutland@....com, labbott@...oraproject.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC/PoC PATCH 0/3] arm64: basic ROP mitigation

On 08/02/2018 03:21 PM, Ard Biesheuvel wrote:
> The idea is that we can significantly limit the kernel's attack surface
> for ROP based attacks by clearing the stack pointer's sign bit before
> returning from a function, and setting it again right after proceeding
> from the [expected] return address. This should make it much more difficult
> to return to arbitrary gadgets, given that they rely on being chained to
> the next via a return address popped off the stack, and this is difficult
> when the stack pointer is invalid.

Doesn't this break stack unwinding?

Thanks,
Florian

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