Re: [PATCH] PPC: in celleb_show_cpuinfo() convert strncpy(x, y, sizeof(x)) to strlcpy

[Segher Boessenkool <segher@kernel.crashing.org>]

> This patch was not yet tested. Please confirm it's right.
> ---
> strncpy does not append '\0' if the length of the source string equals
> the size parameter, strlcpy does.

strlcpy() doesn't fill the rest of the array with zeroes, strncpy()
does.  This could matter (information leak, for example), although
I doubt it does here.

> -	strncpy(celleb_machine_type, ptr, sizeof(celleb_machine_type));
> +	strlcpy(celleb_machine_type, ptr, sizeof(celleb_machine_type));
>  	celleb_machine_type[sizeof(celleb_machine_type)-1] = 0;

That last statement makes the strncpy() case always zero-terminated,
so this patch isn't necessary.  Oh, and neither the old nor the new
code handles the case where the string doesn't fit (other than just
cutting it short); is that the wanted behaviour?


Segher