[PATCH v5] Add reallocarray function.

[Dennis Wölfing]

On 15.05.2017 14:22, Dennis Wölfing wrote:
> The reallocarray function is an extension from OpenBSD.  It is an
> integer-overflow-safe replacement for realloc(p, X*Y) and
> malloc(X*Y) (realloc(NULL, X*Y)).  It can therefore help in preventing
> certain security issues in code.
> 
> This is an updated version of a patch originally submitted by Rüdiger
> Sonderfeld in May 2014.
> See <https://sourceware.org/ml/libc-alpha/2014-05/msg00481.html>.
> 
> Tested on i686 and x86_64.
> 
> 2017-05-15  Dennis Wölfing  <denniswoelfing@gmx.de>
>             Rüdiger Sonderfeld  <ruediger@c-plusplus.de>
> 
> 	* include/stdlib.h (__libc_reallocarray): New declaration.
> 	* malloc/Makefile (routines): Add reallocarray.
> 	(tests): Add tst-reallocarray.c.
> 	* malloc/Versions: Add reallocarray and __libc_reallocarray.
> 	* malloc/malloc-internal.h (check_mul_overflow_size_t): New inline
> 	function.
> 	* malloc/malloc.h (reallocarray): New declaration.
> 	* stdlib/stdlib.h (reallocarray): Likewise.
> 	* malloc/reallocarray.c: New file.
> 	* malloc/tst-reallocarray.c: New test file.
> 	* manual/memory.texi: Document reallocarray.
> 	* sysdeps/arm/nacl/libc.abilist: Add reallocarray.
> 	* sysdeps/unix/sysv/linux/aarch64/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/arm/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/i386/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist:
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist:
> 	Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/tilepro/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise.
> 	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.

Ping. Note that because of the removal of the NaCl port the
sysdeps/arm/nacl/libc.abilist file must no longer be patched.
I have attached a rebased version of the patch. Otherwise the patch is
identical the the v5.

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