Re: lapi/prctl: add more fallback definitions

Hi Andrea,

On Aug 1, 2026, Andrea Cervesato wrote:
> lapi/prctl: add more fallback definitions

--- [PATCH 2/2] ---

> +	static const int try_sizes[] = {
> +		MAX_AUXV_QWORDS,
> +		MAX_AUXV_QWORDS - 4,
> +		MAX_AUXV_QWORDS - 8
> +	};
> [...]
> +		valid_auxv_size = try_sizes[i] * sizeof(uint64_t);

Could these sizes either use the native word size, or could the test be
restricted to the 64-bit architectures on which the reproducer works?

On i386, the smallest attempted size is 320 bytes, but the kernel's
saved_auxv is only 56 * sizeof(unsigned long), or 224 bytes.
prctl_set_mm_map() therefore rejects all three attempts, and setup reports
TBROK. With no supported_archs restriction, the cve runtest entry runs this
test on 32-bit x86.

Verdict - Needs revision

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