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SubjectRe: [PATCH -v2] x86/retpoline: Ensure default return thunk isn't used at runtime
On Wed, Feb 07, 2024 at 07:53:28PM +0100, Borislav Petkov wrote:
> On Wed, Feb 07, 2024 at 09:50:10AM -0800, Josh Poimboeuf wrote:
> > And as you say, there are many frankenkernels out there and upstream
> > doesn't want to be in the business of debugging them.
>
> Ok, all valid points. Diff ontop.
>
> I'll queue it now so that it has ample time of cooking in linux-next.
>
> Thx.
>
> ---
>
> diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
> index 612c9ec456ae..5a300a7bad04 100644
> --- a/arch/x86/kernel/cpu/bugs.c
> +++ b/arch/x86/kernel/cpu/bugs.c
> @@ -2853,16 +2853,5 @@ ssize_t cpu_show_gds(struct device *dev, struct device_attribute *attr, char *bu
>
> void __warn_thunk(void)
> {
> - pr_warn_once("\n");
> - pr_warn_once("**********************************************************\n");
> - pr_warn_once("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
> - pr_warn_once("** **\n");
> - pr_warn_once("** Unpatched return thunk in use. This should not **\n");
> - pr_warn_once("** happen on a production kernel. Please report this **\n");
> - pr_warn_once("** to x86@kernel.org. **\n");
> - pr_warn_once("** **\n");
> - pr_warn_once("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
> - pr_warn_once("**********************************************************\n");
> -
> - dump_stack();
> + WARN_ONCE(1, "Unpatched return thunk in use. This should not happen!\n");
> }

LGTM, thanks!

--
Josh

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