linux-kernel - Re: [PATCH v2] x86: um: vdso: Disable UBSAN instrumentation

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Message-ID: <202405131302.51918C1C1A@keescook>
Date: Mon, 13 May 2024 13:02:55 -0700
From: Kees Cook <keescook@...omium.org>
To: Roberto Sassu <roberto.sassu@...weicloud.com>
Cc: richard@....at, anton.ivanov@...bridgegreys.com,
	johannes@...solutions.net, tglx@...utronix.de, mingo@...hat.com,
	bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
	x86@...nel.org, linux-um@...ts.infradead.org,
	linux-kernel@...r.kernel.org, zohar@...ux.ibm.com,
	linux-integrity@...r.kernel.org,
	Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v2] x86: um: vdso: Disable UBSAN instrumentation

On Mon, May 13, 2024 at 03:10:24PM +0200, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
> 
> The UBSAN instrumentation cannot work in the vDSO since it is executing in
> userspace, so disable it in the Makefile. Fixes the build failures such as:
> 
>   CALL    scripts/checksyscalls.sh
>   VDSO    arch/x86/um/vdso/vdso.so.dbg
> arch/x86/um/vdso/vdso.so.dbg: undefined symbols found
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>

This is fixed differently (and more universally) here:
https://lore.kernel.org/lkml/20240506133544.2861555-1-masahiroy@kernel.org/

-- 
Kees Cook