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aligned: aligned memory alloc/realloc/free

This commit is contained in:
moneromooo-monero 2018-03-27 12:35:27 +01:00
parent cb9ecab197
commit 71d67bda74
No known key found for this signature in database
GPG Key ID: 686F07454D6CEFC3
5 changed files with 272 additions and 3 deletions
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6
src/common/CMakeLists.txt
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@ -38,7 +38,8 @@ set(common_sources
password.cpp
perf_timer.cpp
threadpool.cpp
updates.cpp)
updates.cpp
aligned.c)
if (STACK_TRACE)
list(APPEND common_sources stack_trace.cpp)
@ -67,7 +68,8 @@ set(common_private_headers
perf_timer.h
stack_trace.h
threadpool.h
updates.h)
updates.h
aligned.h)
monero_private_headers(common
${common_private_headers})

139
src/common/aligned.c Normal file
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@ -0,0 +1,139 @@
// Copyright (c) 2017-2018, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include "aligned.h"
static inline int is_power_of_2(size_t n) { return n && (n & (n-1)) == 0; }
#define MAGIC 0xaa0817161500ff81
#define MAGIC_FREED 0xaa0817161500ff82
static void local_abort(const char *msg)
{
fprintf(stderr, "%s\n", msg);
#ifdef NDEBUG
_exit(1);
#else
abort();
#endif
}
typedef struct
{
uint64_t magic;
void *raw;
size_t bytes;
size_t align;
} control;
void *aligned_malloc(size_t bytes, size_t align)
{
void *raw, *ptr;
control *ctrl;
if (!is_power_of_2(align))
return NULL;
if (bytes > (size_t)-1 - align)
return NULL;
if (bytes + align > (size_t)-1 - sizeof(control))
return NULL;
raw = malloc(bytes + sizeof(control) + align);
if (!raw)
return NULL;
ptr = (void*)(((uintptr_t)raw + align + sizeof(control) - 1) & ~(align-1));
ctrl = ((control*)ptr) - 1;
ctrl->magic = MAGIC;
ctrl->raw = raw;
ctrl->bytes = bytes;
ctrl->align = align;
return ptr;
}
void *aligned_realloc(void *ptr, size_t bytes, size_t align)
{
void *raw, *ptr2;
control *ctrl, *ctrl2;
if (!ptr)
return aligned_malloc(bytes, align);
if (!bytes)
{
aligned_free(ptr);
return NULL;
}
if (!is_power_of_2(align))
return NULL;
ctrl = ((control*)ptr) - 1;
if (ctrl->magic == MAGIC_FREED)
local_abort("Double free detected");
if (ctrl->magic != MAGIC)
local_abort("Freeing unallocated memory");
if (ctrl->align != align)
return NULL;
if (ctrl->bytes >= bytes)
return ptr;
if (ctrl->bytes > (size_t)-1 - ctrl->align)
return NULL;
if (ctrl->bytes + ctrl->align > (size_t)-1 - sizeof(control))
return NULL;
raw = malloc(bytes + sizeof(control) + ctrl->align);
if (!raw)
return NULL;
ptr2 = (void*)(((uintptr_t)raw + ctrl->align + sizeof(control) - 1) & ~(ctrl->align-1));
memcpy(ptr2, ptr, ctrl->bytes);
ctrl2 = ((control*)ptr2) - 1;
ctrl2->magic = MAGIC;
ctrl2->raw = raw;
ctrl2->bytes = bytes;
ctrl2->align = ctrl->align;
ctrl->magic = MAGIC_FREED;
free(ctrl->raw);
return ptr2;
}
void aligned_free(void *ptr)
{
if (!ptr)
return;
control *ctrl = ((control*)ptr) - 1;
if (ctrl->magic == MAGIC_FREED)
local_abort("Double free detected");
if (ctrl->magic != MAGIC)
local_abort("Freeing unallocated memory");
ctrl->magic = MAGIC_FREED;
free(ctrl->raw);
}

41
src/common/aligned.h Normal file
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@ -0,0 +1,41 @@
// Copyright (c) 2018, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
void *aligned_malloc(size_t bytes, size_t align);
void *aligned_realloc(void *ptr, size_t bytes, size_t align);
void aligned_free(void *ptr);
#ifdef __cplusplus
}
#endif

3
tests/unit_tests/CMakeLists.txt
View File

@ -79,7 +79,8 @@ set(unit_tests_sources
vercmp.cpp
ringdb.cpp
wipeable_string.cpp
is_hdd.cpp)
is_hdd.cpp
aligned.cpp)
set(unit_tests_headers
unit_tests_utils.h)

86
tests/unit_tests/aligned.cpp Normal file
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@ -0,0 +1,86 @@
// Copyright (c) 2018, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "gtest/gtest.h"
#include "common/aligned.h"
TEST(aligned, large_null) { ASSERT_TRUE(aligned_malloc((size_t)-1, 1) == NULL); }
TEST(aligned, free_null) { aligned_free(NULL); }
TEST(aligned, zero) { void *ptr = aligned_malloc(0, 1); ASSERT_TRUE(ptr); aligned_free(ptr); }
TEST(aligned, aligned1) { void *ptr = aligned_malloc(1, 1); ASSERT_TRUE(ptr); aligned_free(ptr); }
TEST(aligned, aligned4096) { void *ptr = aligned_malloc(1, 4096); ASSERT_TRUE(ptr && ((uintptr_t)ptr & 4095) == 0); aligned_free(ptr); }
TEST(aligned, aligned8) { void *ptr = aligned_malloc(1, 8); ASSERT_TRUE(ptr && ((uintptr_t)ptr & 7) == 0); aligned_free(ptr); }
TEST(aligned, realloc_null) { void *ptr = aligned_realloc(NULL, 1, 4096); ASSERT_TRUE(ptr && ((uintptr_t)ptr & 4095) == 0); aligned_free(ptr); }
TEST(aligned, realloc_diff_align) { void *ptr = aligned_malloc(1, 4096); ASSERT_TRUE(!aligned_realloc(ptr, 1, 2048)); aligned_free(ptr); }
TEST(aligned, realloc_same) { void *ptr = aligned_malloc(1, 4096), *ptr2 = aligned_realloc(ptr, 1, 4096); ASSERT_TRUE(ptr == ptr2); aligned_free(ptr2); }
TEST(aligned, realloc_larger) { void *ptr = aligned_malloc(1, 4096), *ptr2 = aligned_realloc(ptr, 2, 4096); ASSERT_TRUE(ptr != ptr2); aligned_free(ptr2); }
TEST(aligned, realloc_zero) { void *ptr = aligned_malloc(1, 4096), *ptr2 = aligned_realloc(ptr, 0, 4096); ASSERT_TRUE(ptr && !ptr2); }
TEST(aligned, contents_larger)
{
unsigned char *ptr = (unsigned char*)aligned_malloc(50, 256);
ASSERT_TRUE(ptr);
for (int n = 0; n < 50; ++n)
ptr[n] = n;
unsigned char *ptr2 = (unsigned char*)aligned_realloc(ptr, 51, 256);
for (int n = 0; n < 50; ++n)
{
ASSERT_TRUE(ptr2[n] == n);
}
aligned_free(ptr2);
}
TEST(aligned, contents_same)
{
unsigned char *ptr = (unsigned char*)aligned_malloc(50, 256);
ASSERT_TRUE(ptr);
for (int n = 0; n < 50; ++n)
ptr[n] = n;
unsigned char *ptr2 = (unsigned char*)aligned_realloc(ptr, 50, 256);
for (int n = 0; n < 50; ++n)
{
ASSERT_TRUE(ptr2[n] == n);
}
aligned_free(ptr2);
}
TEST(aligned, contents_smaller)
{
unsigned char *ptr = (unsigned char*)aligned_malloc(50, 256);
ASSERT_TRUE(ptr);
for (int n = 0; n < 50; ++n)
ptr[n] = n;
unsigned char *ptr2 = (unsigned char*)aligned_realloc(ptr, 49, 256);
for (int n = 0; n < 49; ++n)
{
ASSERT_TRUE(ptr2[n] == n);
}
aligned_free(ptr2);
}