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485 lines (302 loc) · 9.39 KB
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/*
p0f - error-checking, memory-zeroing alloc routines
---------------------------------------------------
Copyright (C) 2012 by Michal Zalewski <lcamtuf@coredump.cx>
Distributed under the terms and conditions of GNU LGPL.
*/
#ifndef _HAVE_ALLOC_INL_H
#define _HAVE_ALLOC_INL_H
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "types.h"
#include "debug.h"
#define ALLOC_CHECK_SIZE(_s) do { \
if ((_s) > MAX_ALLOC) \
ABORT("Bad alloc request: %u bytes", (_s)); \
} while (0)
#define ALLOC_CHECK_RESULT(_r,_s) do { \
if (!(_r)) \
ABORT("Out of memory: can't allocate %u bytes", (_s)); \
} while (0)
#define ALLOC_MAGIC 0xFF00
#define ALLOC_MAGIC_F 0xFE00
#define ALLOC_C(_ptr) (((u16*)(_ptr))[-3])
#define ALLOC_S(_ptr) (((u32*)(_ptr))[-1])
#define CHECK_PTR(_p) do { \
if ((_p) && ALLOC_C(_p) != ALLOC_MAGIC) {\
if (ALLOC_C(_p) == ALLOC_MAGIC_F) \
ABORT("Use after free."); \
else \
ABORT("Bad alloc canary."); \
} \
} while (0)
#define CHECK_PTR_EXPR(_p) ({ \
typeof (_p) _tmp = (_p); \
CHECK_PTR(_tmp); \
_tmp; \
})
#ifdef CHECK_UAF
# define CP(_p) CHECK_PTR_EXPR(_p)
#else
# define CP(_p) (_p)
#endif /* ^CHECK_UAF */
#ifdef ALIGN_ACCESS
# define ALLOC_OFF 8
#else
# define ALLOC_OFF 6
#endif /* ^ALIGN_ACCESS */
static inline void* DFL_ck_alloc(u32 size) {
void* ret;
if (!size) return NULL;
ALLOC_CHECK_SIZE(size);
ret = malloc(size + ALLOC_OFF);
ALLOC_CHECK_RESULT(ret, size);
ret += ALLOC_OFF;
ALLOC_C(ret) = ALLOC_MAGIC;
ALLOC_S(ret) = size;
return memset(ret, 0, size);
}
static inline void* DFL_ck_realloc(void* orig, u32 size) {
void* ret;
u32 old_size = 0;
if (!size) {
if (orig) {
CHECK_PTR(orig);
/* Catch pointer issues sooner. */
#ifdef DEBUG_BUILD
memset(orig - ALLOC_OFF, 0xFF, ALLOC_S(orig) + ALLOC_OFF);
#endif /* DEBUG_BUILD */
free(orig - ALLOC_OFF);
}
return NULL;
}
if (orig) {
CHECK_PTR(orig);
#ifndef DEBUG_BUILD
ALLOC_C(orig) = ALLOC_MAGIC_F;
#endif /* !DEBUG_BUILD */
old_size = ALLOC_S(orig);
orig -= ALLOC_OFF;
ALLOC_CHECK_SIZE(old_size);
}
ALLOC_CHECK_SIZE(size);
#ifndef DEBUG_BUILD
ret = realloc(orig, size + ALLOC_OFF);
ALLOC_CHECK_RESULT(ret, size);
#else
/* Catch pointer issues sooner: force relocation and make sure that the
original buffer is wiped. */
ret = malloc(size + ALLOC_OFF);
ALLOC_CHECK_RESULT(ret, size);
if (orig) {
memcpy(ret + ALLOC_OFF, orig + ALLOC_OFF, MIN(size, old_size));
memset(orig, 0xFF, old_size + ALLOC_OFF);
ALLOC_C(orig + ALLOC_OFF) = ALLOC_MAGIC_F;
free(orig);
}
#endif /* ^!DEBUG_BUILD */
ret += ALLOC_OFF;
ALLOC_C(ret) = ALLOC_MAGIC;
ALLOC_S(ret) = size;
if (size > old_size)
memset(ret + old_size, 0, size - old_size);
return ret;
}
static inline void* DFL_ck_realloc_kb(void* orig, u32 size) {
#ifndef DEBUG_BUILD
if (orig) {
CHECK_PTR(orig);
if (ALLOC_S(orig) >= size) return orig;
size = ((size >> 10) + 1) << 10;
}
#endif /* !DEBUG_BUILD */
return DFL_ck_realloc(orig, size);
}
static inline u8* DFL_ck_strdup(u8* str) {
void* ret;
u32 size;
if (!str) return NULL;
size = strlen((char*)str) + 1;
ALLOC_CHECK_SIZE(size);
ret = malloc(size + ALLOC_OFF);
ALLOC_CHECK_RESULT(ret, size);
ret += ALLOC_OFF;
ALLOC_C(ret) = ALLOC_MAGIC;
ALLOC_S(ret) = size;
return memcpy(ret, str, size);
}
static inline void* DFL_ck_memdup(void* mem, u32 size) {
void* ret;
if (!mem || !size) return NULL;
ALLOC_CHECK_SIZE(size);
ret = malloc(size + ALLOC_OFF);
ALLOC_CHECK_RESULT(ret, size);
ret += ALLOC_OFF;
ALLOC_C(ret) = ALLOC_MAGIC;
ALLOC_S(ret) = size;
return memcpy(ret, mem, size);
}
static inline u8* DFL_ck_memdup_str(u8* mem, u32 size) {
u8* ret;
if (!mem || !size) return NULL;
ALLOC_CHECK_SIZE(size);
ret = malloc(size + ALLOC_OFF + 1);
ALLOC_CHECK_RESULT(ret, size);
ret += ALLOC_OFF;
ALLOC_C(ret) = ALLOC_MAGIC;
ALLOC_S(ret) = size;
memcpy(ret, mem, size);
ret[size] = 0;
return ret;
}
static inline void DFL_ck_free(void* mem) {
if (mem) {
CHECK_PTR(mem);
#ifdef DEBUG_BUILD
/* Catch pointer issues sooner. */
memset(mem - ALLOC_OFF, 0xFF, ALLOC_S(mem) + ALLOC_OFF);
#endif /* DEBUG_BUILD */
ALLOC_C(mem) = ALLOC_MAGIC_F;
free(mem - ALLOC_OFF);
}
}
#ifndef DEBUG_BUILD
/* Non-debugging mode - straightforward aliasing. */
#define ck_alloc DFL_ck_alloc
#define ck_realloc DFL_ck_realloc
#define ck_realloc_kb DFL_ck_realloc_kb
#define ck_strdup DFL_ck_strdup
#define ck_memdup DFL_ck_memdup
#define ck_memdup_str DFL_ck_memdup_str
#define ck_free DFL_ck_free
#else
/* Debugging mode - include additional structures and support code. */
#define ALLOC_BUCKETS 4096
#define ALLOC_TRK_CHUNK 256
struct TRK_obj {
void *ptr;
char *file, *func;
u32 line;
};
extern struct TRK_obj* TRK[ALLOC_BUCKETS];
extern u32 TRK_cnt[ALLOC_BUCKETS];
#define TRKH(_ptr) (((((u32)(_ptr)) >> 16) ^ ((u32)(_ptr))) % ALLOC_BUCKETS)
/* Adds a new entry to the list of allocated objects. */
static inline void TRK_alloc_buf(void* ptr, const char* file, const char* func,
u32 line) {
u32 i, bucket;
if (!ptr) return;
bucket = TRKH(ptr);
for (i = 0; i < TRK_cnt[bucket]; i++)
if (!TRK[bucket][i].ptr) {
TRK[bucket][i].ptr = ptr;
TRK[bucket][i].file = (char*)file;
TRK[bucket][i].func = (char*)func;
TRK[bucket][i].line = line;
return;
}
/* No space available. */
if (!(i % ALLOC_TRK_CHUNK)) {
TRK[bucket] = DFL_ck_realloc(TRK[bucket],
(TRK_cnt[bucket] + ALLOC_TRK_CHUNK) * sizeof(struct TRK_obj));
}
TRK[bucket][i].ptr = ptr;
TRK[bucket][i].file = (char*)file;
TRK[bucket][i].func = (char*)func;
TRK[bucket][i].line = line;
TRK_cnt[bucket]++;
}
/* Removes entry from the list of allocated objects. */
static inline void TRK_free_buf(void* ptr, const char* file, const char* func,
u32 line) {
u32 i, bucket;
if (!ptr) return;
bucket = TRKH(ptr);
for (i = 0; i < TRK_cnt[bucket]; i++)
if (TRK[bucket][i].ptr == ptr) {
TRK[bucket][i].ptr = 0;
return;
}
WARN("ALLOC: Attempt to free non-allocated memory in %s (%s:%u)",
func, file, line);
}
/* Does a final report on all non-deallocated objects. */
static inline void TRK_report(void) {
u32 i, bucket;
fflush(0);
for (bucket = 0; bucket < ALLOC_BUCKETS; bucket++)
for (i = 0; i < TRK_cnt[bucket]; i++)
if (TRK[bucket][i].ptr)
WARN("ALLOC: Memory never freed, created in %s (%s:%u)",
TRK[bucket][i].func, TRK[bucket][i].file, TRK[bucket][i].line);
}
/* Simple wrappers for non-debugging functions: */
static inline void* TRK_ck_alloc(u32 size, const char* file, const char* func,
u32 line) {
void* ret = DFL_ck_alloc(size);
TRK_alloc_buf(ret, file, func, line);
return ret;
}
static inline void* TRK_ck_realloc(void* orig, u32 size, const char* file,
const char* func, u32 line) {
void* ret = DFL_ck_realloc(orig, size);
TRK_free_buf(orig, file, func, line);
TRK_alloc_buf(ret, file, func, line);
return ret;
}
static inline void* TRK_ck_realloc_kb(void* orig, u32 size, const char* file,
const char* func, u32 line) {
void* ret = DFL_ck_realloc_kb(orig, size);
TRK_free_buf(orig, file, func, line);
TRK_alloc_buf(ret, file, func, line);
return ret;
}
static inline void* TRK_ck_strdup(u8* str, const char* file, const char* func,
u32 line) {
void* ret = DFL_ck_strdup(str);
TRK_alloc_buf(ret, file, func, line);
return ret;
}
static inline void* TRK_ck_memdup(void* mem, u32 size, const char* file,
const char* func, u32 line) {
void* ret = DFL_ck_memdup(mem, size);
TRK_alloc_buf(ret, file, func, line);
return ret;
}
static inline void* TRK_ck_memdup_str(void* mem, u32 size, const char* file,
const char* func, u32 line) {
void* ret = DFL_ck_memdup_str(mem, size);
TRK_alloc_buf(ret, file, func, line);
return ret;
}
static inline void TRK_ck_free(void* ptr, const char* file,
const char* func, u32 line) {
TRK_free_buf(ptr, file, func, line);
DFL_ck_free(ptr);
}
/* Alias user-facing names to tracking functions: */
#define ck_alloc(_p1) \
TRK_ck_alloc(_p1, __FILE__, __FUNCTION__, __LINE__)
#define ck_realloc(_p1, _p2) \
TRK_ck_realloc(_p1, _p2, __FILE__, __FUNCTION__, __LINE__)
#define ck_realloc_kb(_p1, _p2) \
TRK_ck_realloc_kb(_p1, _p2, __FILE__, __FUNCTION__, __LINE__)
#define ck_strdup(_p1) \
TRK_ck_strdup(_p1, __FILE__, __FUNCTION__, __LINE__)
#define ck_memdup(_p1, _p2) \
TRK_ck_memdup(_p1, _p2, __FILE__, __FUNCTION__, __LINE__)
#define ck_memdup_str(_p1, _p2) \
TRK_ck_memdup_str(_p1, _p2, __FILE__, __FUNCTION__, __LINE__)
#define ck_free(_p1) \
TRK_ck_free(_p1, __FILE__, __FUNCTION__, __LINE__)
#endif /* ^!DEBUG_BUILD */
#define alloc_printf(_str...) ({ \
u8* _tmp; \
s32 _len = snprintf(NULL, 0, _str); \
if (_len < 0) FATAL("Whoa, snprintf() fails?!"); \
_tmp = ck_alloc(_len + 1); \
snprintf((char*)_tmp, _len + 1, _str); \
_tmp; \
})
#endif /* ! _HAVE_ALLOC_INL_H */
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