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/* Malloc debug DSO.
Copyright (C) 2021 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; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <atomic.h>
#include <libc-symbols.h>
#include <shlib-compat.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
/* Support only the glibc allocators. */
extern void *__libc_malloc (size_t);
extern void __libc_free (void *);
extern void *__libc_realloc (void *, size_t);
extern void *__libc_memalign (size_t, size_t);
extern void *__libc_valloc (size_t);
extern void *__libc_pvalloc (size_t);
extern void *__libc_calloc (size_t, size_t);
#define DEBUG_FN(fn) \
static __typeof (__libc_ ## fn) __debug_ ## fn
DEBUG_FN(malloc);
DEBUG_FN(free);
DEBUG_FN(realloc);
DEBUG_FN(memalign);
DEBUG_FN(valloc);
DEBUG_FN(pvalloc);
DEBUG_FN(calloc);
extern void (*__free_hook) (void *, const void *);
compat_symbol_reference (libc, __free_hook, __free_hook, GLIBC_2_0);
extern void * (*__malloc_hook) (size_t, const void *);
compat_symbol_reference (libc, __malloc_hook, __malloc_hook, GLIBC_2_0);
extern void * (*__realloc_hook) (void *, size_t, const void *);
compat_symbol_reference (libc, __realloc_hook, __realloc_hook, GLIBC_2_0);
extern void * (*__memalign_hook) (size_t, size_t, const void *);
compat_symbol_reference (libc, __memalign_hook, __memalign_hook, GLIBC_2_0);
static size_t pagesize;
/* The allocator functions. */
static void *
__debug_malloc (size_t bytes)
{
void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook);
if (__builtin_expect (hook != NULL, 0))
return (*hook)(bytes, RETURN_ADDRESS (0));
return __libc_malloc (bytes);
}
strong_alias (__debug_malloc, malloc)
static void
__debug_free (void *mem)
{
void (*hook) (void *, const void *) = atomic_forced_read (__free_hook);
if (__builtin_expect (hook != NULL, 0))
{
(*hook)(mem, RETURN_ADDRESS (0));
return;
}
__libc_free (mem);
}
strong_alias (__debug_free, free)
static void *
__debug_realloc (void *oldmem, size_t bytes)
{
void *(*hook) (void *, size_t, const void *) =
atomic_forced_read (__realloc_hook);
if (__builtin_expect (hook != NULL, 0))
return (*hook)(oldmem, bytes, RETURN_ADDRESS (0));
return __libc_realloc (oldmem, bytes);
}
strong_alias (__debug_realloc, realloc)
static void *
_debug_mid_memalign (size_t alignment, size_t bytes, const void *address)
{
void *(*hook) (size_t, size_t, const void *) =
atomic_forced_read (__memalign_hook);
if (__builtin_expect (hook != NULL, 0))
return (*hook)(alignment, bytes, address);
return __libc_memalign (alignment, bytes);
}
static void *
__debug_memalign (size_t alignment, size_t bytes)
{
return _debug_mid_memalign (alignment, bytes, RETURN_ADDRESS (0));
}
strong_alias (__debug_memalign, memalign)
strong_alias (__debug_memalign, aligned_alloc)
static void *
__debug_pvalloc (size_t bytes)
{
size_t rounded_bytes;
if (!pagesize)
pagesize = sysconf (_SC_PAGESIZE);
/* ALIGN_UP with overflow check. */
if (__glibc_unlikely (__builtin_add_overflow (bytes,
pagesize - 1,
&rounded_bytes)))
{
errno = ENOMEM;
return NULL;
}
rounded_bytes = rounded_bytes & -(pagesize - 1);
return _debug_mid_memalign (pagesize, rounded_bytes, RETURN_ADDRESS (0));
}
strong_alias (__debug_pvalloc, pvalloc)
static void *
__debug_valloc (size_t bytes)
{
if (!pagesize)
pagesize = sysconf (_SC_PAGESIZE);
return _debug_mid_memalign (pagesize, bytes, RETURN_ADDRESS (0));
}
strong_alias (__debug_valloc, valloc)
static int
__debug_posix_memalign (void **memptr, size_t alignment, size_t bytes)
{
/* Test whether the SIZE argument is valid. It must be a power of
two multiple of sizeof (void *). */
if (alignment % sizeof (void *) != 0
|| !powerof2 (alignment / sizeof (void *))
|| alignment == 0)
return EINVAL;
*memptr = _debug_mid_memalign (alignment, bytes, RETURN_ADDRESS (0));
if (*memptr == NULL)
return ENOMEM;
return 0;
}
strong_alias (__debug_posix_memalign, posix_memalign)
static void *
__debug_calloc (size_t nmemb, size_t size)
{
void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook);
if (__builtin_expect (hook != NULL, 0))
{
size_t bytes;
if (__glibc_unlikely (__builtin_mul_overflow (nmemb, size, &bytes)))
{
errno = ENOMEM;
return NULL;
}
void *mem = (*hook)(bytes, RETURN_ADDRESS (0));
if (mem != NULL)
memset (mem, 0, bytes);
return mem;
}
return __libc_calloc (nmemb, size);
}
strong_alias (__debug_calloc, calloc)
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