On Tue, Aug 23, 2016 at 10:25:45PM +0100, Al Viro wrote: > Sadly, sizeof is what we use when copying that sucker to userland. So these > padding bits in the end would've leaked, true enough, and the case is somewhat > weaker. And any normal architecture will have those, but then any such > architecture will have no more trouble zeroing a 32bit value than 16bit one.
Hmm, good point. Too bad I don't see a compiler option of "zero all padding in structs". Certainly generating the code should not really be that different. I see someone did request it 2 years ago: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63479 -- Len Sorensen
