[PATCH] more out of bounds checking improvements

[Tulio Magno Quites Machado Filho]

Andreas Schwab <schwab@linux-m68k.org> writes:

> makedb.c: In function 'write_output':
> makedb.c:797:7: error: 'writev' specified size 4294967295 exceeds maximum object size 2147483647 [-Werror=stringop-overflow=]
>   797 |   if (writev (fd, iov, iov_nelts) != keydataoffset)
>       |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> In file included from ../include/sys/uio.h:2,
>                  from makedb.c:39:
> ../misc/sys/uio.h:52:16: note: in a call to function 'writev' declared with attribute 'read_only (2, 3)'
>    52 | extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count)
>       |                ^~~~~~
> cc1: all warnings being treated as errors
> make[2]: *** [../o-iterator.mk:9: /home/abuild/rpmbuild/BUILD/glibc-2.33.9000.515.g3bf0b4f2cd/cc-base/nss/makedb.o] Error 1
> make[2]: *** Waiting for unfinished jobs....
> make[2]: Leaving directory '/home/abuild/rpmbuild/BUILD/glibc-2.33.9000.515.g3bf0b4f2cd/nss'
> make[1]: *** [Makefile:479: nss/others] Error 2
> make[1]: Leaving directory '/home/abuild/rpmbuild/BUILD/glibc-2.33.9000.515.g3bf0b4f2cd'
> make: *** [Makefile:9: all] Error 2

I'm also reproducing this on ppc32 with GCC 10.
I'm not using -DNDEBUG.

-- 
Tulio Magno