linux-kernel - Re: [RFC PATCH v4 22/37] arm64: kernel: Skip validation of kuser32.o

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 6 May 2022 10:31:40 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arch@...r.kernel.org, jthierry@...hat.com,
        catalin.marinas@....com, will@...nel.org, masahiroy@...nel.org,
        jpoimboe@...hat.com, ycote@...hat.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, ardb@...nel.org, maz@...nel.org,
        tglx@...utronix.de, luc.vanoostenryck@...il.com
Subject: Re: [RFC PATCH v4 22/37] arm64: kernel: Skip validation of kuser32.o

On Thu, May 05, 2022 at 11:56:45AM +0100, Mark Rutland wrote:
> The objects under arch/arm64/kernel/{vdso,vdso32}/ are all userspace objects,
> and from userspace's PoV the existing secrtions within those objects are
> correct, so I don't think those should change.
> 
> How does x86 deal with its vdso objects?

On x86, we just use OBJECT_FILES_NON_STANDARD (like the up-thread patch)
to tell objtool to ignore all the vdso objects.

That should be fine for vdso, since it doesn't actually end up as text
in vmlinux.

-- 
Josh