[LTP] [PATCH v6 1/3] syscalls/modify_ldt: Add lapi/ldt.h

[Ricardo B. Marlière]

On Mon Apr 7, 2025 at 9:09 AM -03, Cyril Hrubis wrote:
> Hi!
>> +static inline int modify_ldt(int func, const struct user_desc *ptr,
>> +			     unsigned long bytecount)
>> +{
>> +	return tst_syscall(__NR_modify_ldt, func, ptr, bytecount);
>> +}
>> +
>> +static inline int safe_modify_ldt(const char *file, const int lineno, int func,
>> +				  const struct user_desc *ptr,
>> +				  unsigned long bytecount)
>> +{
>> +	int rval;
>> +
>> +	rval = modify_ldt(func, ptr, bytecount);
>> +	if (rval == -1)
>> +		tst_brk_(file, lineno, TBROK | TERRNO,
>> +			 "modify_ldt(%d, %p, %lu)", func, ptr, bytecount);
>
> We should make sure that we only accept the success value here (as we do
> in the rest of the safe macros) so that we catch the cases when kernel
> returns an invalid value.
>
> This should be:
>
> 	if (rval == -1) {
> 		tst_brk_(...);
> 	} else if (rval) {
> 		tst_brk_("modify_ltd(...) invalid retval %i", ...);
> 	}

Makes sense! Unfortunately I just sent a v7, will wait some more before
sending the next one :)

>
>
> With that fixed:
>
> Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

Thanks for reviewing,
-	Ricardo.