Retro68/gcc/libsanitizer/asan/asan_malloc_linux.cc
2015-08-28 17:33:40 +02:00

185 lines
5.6 KiB
C++

//===-- asan_malloc_linux.cc ----------------------------------------------===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Linux-specific malloc interception.
// We simply define functions like malloc, free, realloc, etc.
// They will replace the corresponding libc functions automagically.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_FREEBSD || SANITIZER_LINUX
#include "sanitizer_common/sanitizer_tls_get_addr.h"
#include "asan_allocator.h"
#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_stack.h"
// ---------------------- Replacement functions ---------------- {{{1
using namespace __asan; // NOLINT
INTERCEPTOR(void, free, void *ptr) {
GET_STACK_TRACE_FREE;
asan_free(ptr, &stack, FROM_MALLOC);
}
INTERCEPTOR(void, cfree, void *ptr) {
GET_STACK_TRACE_FREE;
asan_free(ptr, &stack, FROM_MALLOC);
}
INTERCEPTOR(void*, malloc, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_malloc(size, &stack);
}
INTERCEPTOR(void*, calloc, uptr nmemb, uptr size) {
if (UNLIKELY(!asan_inited)) {
// Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
const uptr kCallocPoolSize = 1024;
static uptr calloc_memory_for_dlsym[kCallocPoolSize];
static uptr allocated;
uptr size_in_words = ((nmemb * size) + kWordSize - 1) / kWordSize;
void *mem = (void*)&calloc_memory_for_dlsym[allocated];
allocated += size_in_words;
CHECK(allocated < kCallocPoolSize);
return mem;
}
GET_STACK_TRACE_MALLOC;
return asan_calloc(nmemb, size, &stack);
}
INTERCEPTOR(void*, realloc, void *ptr, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_realloc(ptr, size, &stack);
}
INTERCEPTOR(void*, memalign, uptr boundary, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_memalign(boundary, size, &stack, FROM_MALLOC);
}
INTERCEPTOR(void*, aligned_alloc, uptr boundary, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_memalign(boundary, size, &stack, FROM_MALLOC);
}
INTERCEPTOR(void*, __libc_memalign, uptr boundary, uptr size) {
GET_STACK_TRACE_MALLOC;
void *res = asan_memalign(boundary, size, &stack, FROM_MALLOC);
DTLS_on_libc_memalign(res, size * boundary);
return res;
}
INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
GET_CURRENT_PC_BP_SP;
(void)sp;
return asan_malloc_usable_size(ptr, pc, bp);
}
// We avoid including malloc.h for portability reasons.
// man mallinfo says the fields are "long", but the implementation uses int.
// It doesn't matter much -- we just need to make sure that the libc's mallinfo
// is not called.
struct fake_mallinfo {
int x[10];
};
INTERCEPTOR(struct fake_mallinfo, mallinfo, void) {
struct fake_mallinfo res;
REAL(memset)(&res, 0, sizeof(res));
return res;
}
INTERCEPTOR(int, mallopt, int cmd, int value) {
return -1;
}
INTERCEPTOR(int, posix_memalign, void **memptr, uptr alignment, uptr size) {
GET_STACK_TRACE_MALLOC;
// Printf("posix_memalign: %zx %zu\n", alignment, size);
return asan_posix_memalign(memptr, alignment, size, &stack);
}
INTERCEPTOR(void*, valloc, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_valloc(size, &stack);
}
INTERCEPTOR(void*, pvalloc, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_pvalloc(size, &stack);
}
INTERCEPTOR(void, malloc_stats, void) {
__asan_print_accumulated_stats();
}
#if SANITIZER_ANDROID
// Format of __libc_malloc_dispatch has changed in Android L.
// While we are moving towards a solution that does not depend on bionic
// internals, here is something to support both K* and L releases.
struct MallocDebugK {
void *(*malloc)(uptr bytes);
void (*free)(void *mem);
void *(*calloc)(uptr n_elements, uptr elem_size);
void *(*realloc)(void *oldMem, uptr bytes);
void *(*memalign)(uptr alignment, uptr bytes);
uptr (*malloc_usable_size)(void *mem);
};
struct MallocDebugL {
void *(*calloc)(uptr n_elements, uptr elem_size);
void (*free)(void *mem);
fake_mallinfo (*mallinfo)(void);
void *(*malloc)(uptr bytes);
uptr (*malloc_usable_size)(void *mem);
void *(*memalign)(uptr alignment, uptr bytes);
int (*posix_memalign)(void **memptr, uptr alignment, uptr size);
void* (*pvalloc)(uptr size);
void *(*realloc)(void *oldMem, uptr bytes);
void* (*valloc)(uptr size);
};
ALIGNED(32) const MallocDebugK asan_malloc_dispatch_k = {
WRAP(malloc), WRAP(free), WRAP(calloc),
WRAP(realloc), WRAP(memalign), WRAP(malloc_usable_size)};
ALIGNED(32) const MallocDebugL asan_malloc_dispatch_l = {
WRAP(calloc), WRAP(free), WRAP(mallinfo),
WRAP(malloc), WRAP(malloc_usable_size), WRAP(memalign),
WRAP(posix_memalign), WRAP(pvalloc), WRAP(realloc),
WRAP(valloc)};
namespace __asan {
void ReplaceSystemMalloc() {
void **__libc_malloc_dispatch_p =
(void **)AsanDlSymNext("__libc_malloc_dispatch");
if (__libc_malloc_dispatch_p) {
// Decide on K vs L dispatch format by the presence of
// __libc_malloc_default_dispatch export in libc.
void *default_dispatch_p = AsanDlSymNext("__libc_malloc_default_dispatch");
if (default_dispatch_p)
*__libc_malloc_dispatch_p = (void *)&asan_malloc_dispatch_k;
else
*__libc_malloc_dispatch_p = (void *)&asan_malloc_dispatch_l;
}
}
} // namespace __asan
#else // SANITIZER_ANDROID
namespace __asan {
void ReplaceSystemMalloc() {
}
} // namespace __asan
#endif // SANITIZER_ANDROID
#endif // SANITIZER_FREEBSD || SANITIZER_LINUX