Re: tst_test: Add needs_cpu_vendor to struct tst_test

Hi Cyril,

On Tue, 9 Jun 2026 16:32:37 +0200, Cyril Hrubis wrote:
> tst_test: Add needs_cpu_vendor to struct tst_test

> This adds a generic implementaiton of needs_cpu_vendor to the tst_test

Typo: "implementaiton" -> "implementation".

> +const char *tst_cpu_vendor(void)
> +{
> +	static char cpu_vendor[16];
> ...
> +	ret = FILE_LINES_SCANF(NULL, "/proc/cpuinfo", "vendor_id : %16s[^\n]", cpu_vendor);

Two issues with the scanf format:

1) The width specifier %16s allows writing up to 16 characters plus
a NUL terminator into a 16-byte buffer, which is a one-byte overflow.
Should be %15s.

2) The [^\n] after %16s is treated as literal text to match, not as a
scanset. It is effectively dead and does not do what it looks like it
should. Either drop it, or if the intent was to match characters
including spaces use %15[^\n] as the conversion specifier (but vendor_id
values are single words so %15s should be fine).

> +	if (tst_test->needs_cpu_vendor && strcmp(tst_test->needs_cpu_vendor, tst_cpu_vendor())) {
> +		tst_brk(TCONF, "Tests needs '%s' CPU to continue have '%s'",
> +			tst_test->needs_cpu_vendor, tst_cpu_vendor());
> +	}

The message has a grammar issue. Something like
"Test needs '%s' CPU, have '%s'" would read better.

> diff --git a/include/tst_cpu.h b/include/tst_cpu.h
> ...
> +
> +
> +
>  #endif	/* TST_CPU_H__ */

Two extra blank lines were added before #endif.

Verdict: Needs revision

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