On Fri, Aug 28, 2020 at 12:01:34AM +0300, Denis Efremov wrote: > Just FYI, I've send an addition to the device_attr_show.cocci script[1] to > turn > simple cases of snprintf (e.g. "%i") to sprintf. Looks like many developers > would > like it more than changing snprintf to scnprintf. As for me, I don't like the > idea > of automated altering of the original logic from bounded snprint to unbouded > one > with sprintf.
Agreed. This just makes me cringe. If the API design declares that when a show() callback starts, buf has been allocated with PAGE_SIZE bytes, then that's how the logic should proceed, and it should be using scnprintf... show(...) { size_t remaining = PAGE_SIZE; ... remaining -= scnprintf(buf, remaining, "fmt", var args ...); remaining -= scnprintf(buf, remaining, "fmt", var args ...); remaining -= scnprintf(buf, remaining, "fmt", var args ...); return PAGE_SIZE - remaining; } -- Kees Cook _______________________________________________ Cocci mailing list Cocci@systeme.lip6.fr https://systeme.lip6.fr/mailman/listinfo/cocci