Re: [PATCH] x86/boot: Reject truncated acpi_rsdp= values

[Borislav Petkov]

On Fri, Jun 19, 2026 at 03:00:54AM +0200, Thorsten Blum wrote:
> You can reproduce this with QEMU using the malformed example from
> before:
> 
> 	acpi_rsdp=0x0123456789abcdefx

I just did: it says

[    0.000000] Malformed early option 'acpi_rsdp'

with latest Linus tree without your patch.

That's because that comes from setup_acpi_rsdp() which calls kstrtoul().

I doubt you even hit get_cmdline_acpi_rsdp() as that's the decompressor legacy
path and modern machines boot through the EFI stub like my guest does...

-- 
Regards/Gruss,
    Boris.

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