lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-06-12 08:21:58 +03:00
Code Activity

Implement allocation buffers for internal use

Browse Source 
This commit adds fixed-size allocation buffers.  The primary use
case is in NSS modules, where dynamically sized data is stored
in a fixed-size buffer provided by the caller.

Other uses include a replacement of mempcpy cascades (which is
safer due to the size checking inherent to allocation buffers).
This commit is contained in:
Florian Weimer
2017-06-21 22:43:57 +02:00
parent 11ffcacb64
commit 4dd8e7c0ce
10 changed files with 1240 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
malloc/alloc_buffer_alloc_array.c Normal file
View File

@ -0,0 +1,47 @@
/* Array allocation from a fixed-size buffer.
Copyright (C) 2017 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 <alloc_buffer.h>
#include <malloc-internal.h>
#include <libc-pointer-arith.h>
void *
__libc_alloc_buffer_alloc_array (struct alloc_buffer *buf, size_t element_size,
size_t align, size_t count)
{
size_t current = buf->__alloc_buffer_current;
/* The caller asserts that align is a power of two. */
size_t aligned = ALIGN_UP (current, align);
size_t size;
bool overflow = check_mul_overflow_size_t (element_size, count, &size);
size_t new_current = aligned + size;
if (!overflow /* Multiplication did not overflow. */
&& aligned >= current /* No overflow in align step. */
&& new_current >= size /* No overflow in size computation. */
&& new_current <= buf->__alloc_buffer_end) /* Room in buffer. */
{
buf->__alloc_buffer_current = new_current;
return (void *) aligned;
}
else
{
alloc_buffer_mark_failed (buf);
return NULL;
}
}
libc_hidden_def (__libc_alloc_buffer_alloc_array)