[LTP] arch_prctl: add ARCH_GET_FS, ARCH_GET_GS tests

[linuxtestproject.agent@gmail.com]

Hi Dmitry,

On Sat, 10 Oct 2026, Dmitry Chestnykh wrote:
> arch_prctl: add ARCH_GET_FS, ARCH_GET_GS tests

> +++ b/testcases/kernel/syscalls/arch_prctl/arch_prctl02.c
> +	if (gs == 0) {
> +		unsigned long long test_gs = 0xabababab;

Medium: When the original GS base is zero, both samples fit in 32 bits,
so the test misses truncation in ARCH_GET_GS. A probe masking its result
to 32 bits still reported all tests passed. Use a canonical user-space
base with nonzero upper 32 bits, such as 0x1234ababababULL.

Verdict - Needs revision

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