Re: [PATCH v4 1/4] syscalls: Restore address limit after a syscall

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To: Thomas Garnier <thgarnie@xxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Subject: Re: [PATCH v4 1/4] syscalls: Restore address limit after a syscall
From: "H. Peter Anvin" <hpa@xxxxxxxxx>
Date: Wed, 22 Mar 2017 13:54:40 -0700
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, René Nyffenegger <mail@xxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Paul E . McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Pavel Tikhomirov <ptikhomirov@xxxxxxxxxxxxx>, Stephen Smalley <sds@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Vladimir Murzin <vladimir.murzin@xxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, James Morse <james.morse@xxxxxxx>, "linux-s390@xxxxxxxxxxxxxxx" <linux-s390@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "kernel-hardening@xxxxxxxxxxxxxxxxxx" <kernel-hardening@xxxxxxxxxxxxxxxxxx>
In-reply-to: <CAJcbSZGLAXmE_mFZMAZgioWExzm3A4vXBKLGJ7DZNAbJOcH8Zw@mail.gmail.com>
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On 03/22/17 13:49, Thomas Garnier wrote:
> 
> We can default to BUGging. I think my approach was avoiding doing a
> BUG_ON just to avoid breaking people.
> 

Breaking on a potentially-exploitable bug is a feature.

	-hpa


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