linux-kernel - Re: [PATCH v6 06/15] x86/module: Deal with GOT based stack cookie load on Clang

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Message-ID: <Z7RNxf9NWmGZ6aDE@gmail.com>
Date: Tue, 18 Feb 2025 10:07:17 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Brian Gerst <brgerst@...il.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>, Ard Biesheuvel <ardb@...nel.org>,
	Uros Bizjak <ubizjak@...il.com>
Subject: Re: [PATCH v6 06/15] x86/module: Deal with GOT based stack cookie
 load on Clang < 17


* Brian Gerst <brgerst@...il.com> wrote:

>  #define R_X86_64_GOTPCREL	9	/* 32 bit signed pc relative
> -					   offset to GOT */
> +#define R_X86_64_GOTPCRELX	41	   offset to GOT */
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> +#define R_X86_64_REX_GOTPCRELX	42

Uhm, I'm pretty sure this won't even build, should any code use 
R_X86_64_GOTPCRELX - which it doesn't currently...

Also, each entry here has a comment explaining it - except these two 
new GOTPCREL variants.

Thanks,

	Ingo