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hurd: Make mmap64 use vm_offset_t for overflow check 

The RPC interface used by mmap uses the unsigned vm_offset_t, not the
	signed off_t, so 32bit bigger than 2GiB values are fine actually.

	* sysdeps/mach/hurd/mmap64.c: New file.
This commit is contained in:
Samuel Thibault 2015-11-29 17:25:53 +01:00
parent 894f3e1311
commit 5f75f6bdf8
2 changed files with 54 additions and 0 deletions
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@ -1,3 +1,10 @@
2015-11-29 Samuel Thibault <samuel.thibault@ens-lyon.org>
The RPC interface used by mmap uses the unsigned vm_offset_t, not the
signed off_t, so 32bit bigger than 2GiB values are fine actually.
* sysdeps/mach/hurd/mmap64.c: New file.
2015-11-29 Thomas Schwinge <thomas@codesourcery.com>
* sysdeps/mach/hurd/fork.c (__fork): Install correct number of send

47
sysdeps/mach/hurd/mmap64.c Normal file
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@ -0,0 +1,47 @@
/* Copyright (C) 1997-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sys/mman.h>
#include <sys/types.h>
/* Map addresses starting near ADDR and extending for LEN bytes. From
OFFSET into the file FD describes according to PROT and FLAGS. If ADDR
is nonzero, it is the desired mapping address. If the MAP_FIXED bit is
set in FLAGS, the mapping will be at ADDR exactly (which must be
page-aligned); otherwise the system chooses a convenient nearby address.
The return value is the actual mapping address chosen or MAP_FAILED
for errors (in which case `errno' is set). A successful `mmap' call
deallocates any previous mapping for the affected region. */
__ptr_t
__mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd,
__off64_t offset)
{
vm_offset_t small_offset = (vm_offset_t) offset;
if (small_offset != offset)
{
/* We cannot do this since the offset is too large. */
__set_errno (EOVERFLOW);
return MAP_FAILED;
}
return __mmap (addr, len, prot, flags, fd, small_offset);
}
weak_alias (__mmap64, mmap64)