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//===-- asan_malloc_linux.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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_FUCHSIA || SANITIZER_LINUX || \
SANITIZER_NETBSD || SANITIZER_SOLARIS
# include "asan_allocator.h"
# include "asan_interceptors.h"
# include "asan_internal.h"
# include "asan_stack.h"
# include "lsan/lsan_common.h"
# include "sanitizer_common/sanitizer_allocator_checks.h"
# include "sanitizer_common/sanitizer_allocator_dlsym.h"
# include "sanitizer_common/sanitizer_errno.h"
# include "sanitizer_common/sanitizer_tls_get_addr.h"
// ---------------------- Replacement functions ---------------- {{{1
using namespace __asan;
struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
static bool UseImpl() { return asan_init_is_running; }
static void OnAllocate(const void *ptr, uptr size) {
# if CAN_SANITIZE_LEAKS
// Suppress leaks from dlerror(). Previously dlsym hack on global array was
// used by leak sanitizer as a root region.
__lsan_register_root_region(ptr, size);
# endif
}
static void OnFree(const void *ptr, uptr size) {
# if CAN_SANITIZE_LEAKS
__lsan_unregister_root_region(ptr, size);
# endif
}
};
INTERCEPTOR(void, free, void *ptr) {
if (DlsymAlloc::PointerIsMine(ptr))
return DlsymAlloc::Free(ptr);
GET_STACK_TRACE_FREE;
asan_free(ptr, &stack, FROM_MALLOC);
}
#if SANITIZER_INTERCEPT_CFREE
INTERCEPTOR(void, cfree, void *ptr) {
if (DlsymAlloc::PointerIsMine(ptr))
return DlsymAlloc::Free(ptr);
GET_STACK_TRACE_FREE;
asan_free(ptr, &stack, FROM_MALLOC);
}
#endif // SANITIZER_INTERCEPT_CFREE
INTERCEPTOR(void*, malloc, uptr size) {
if (DlsymAlloc::Use())
return DlsymAlloc::Allocate(size);
ENSURE_ASAN_INITED();
GET_STACK_TRACE_MALLOC;
return asan_malloc(size, &stack);
}
INTERCEPTOR(void*, calloc, uptr nmemb, uptr size) {
if (DlsymAlloc::Use())
return DlsymAlloc::Callocate(nmemb, size);
ENSURE_ASAN_INITED();
GET_STACK_TRACE_MALLOC;
return asan_calloc(nmemb, size, &stack);
}
INTERCEPTOR(void*, realloc, void *ptr, uptr size) {
if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr))
return DlsymAlloc::Realloc(ptr, size);
ENSURE_ASAN_INITED();
GET_STACK_TRACE_MALLOC;
return asan_realloc(ptr, size, &stack);
}
#if SANITIZER_INTERCEPT_REALLOCARRAY
INTERCEPTOR(void*, reallocarray, void *ptr, uptr nmemb, uptr size) {
ENSURE_ASAN_INITED();
GET_STACK_TRACE_MALLOC;
return asan_reallocarray(ptr, nmemb, size, &stack);
}
#endif // SANITIZER_INTERCEPT_REALLOCARRAY
#if SANITIZER_INTERCEPT_MEMALIGN
INTERCEPTOR(void*, memalign, 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);
return res;
}
#endif // SANITIZER_INTERCEPT_MEMALIGN
#if SANITIZER_INTERCEPT_ALIGNED_ALLOC
INTERCEPTOR(void*, aligned_alloc, uptr boundary, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_aligned_alloc(boundary, size, &stack);
}
#endif // SANITIZER_INTERCEPT_ALIGNED_ALLOC
INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
GET_CURRENT_PC_BP_SP;
(void)sp;
return asan_malloc_usable_size(ptr, pc, bp);
}
#if SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
// 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 0;
}
#endif // SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
INTERCEPTOR(int, posix_memalign, void **memptr, uptr alignment, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_posix_memalign(memptr, alignment, size, &stack);
}
INTERCEPTOR(void*, valloc, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_valloc(size, &stack);
}
#if SANITIZER_INTERCEPT_PVALLOC
INTERCEPTOR(void*, pvalloc, uptr size) {
GET_STACK_TRACE_MALLOC;
return asan_pvalloc(size, &stack);
}
#endif // SANITIZER_INTERCEPT_PVALLOC
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_FUCHSIA || SANITIZER_LINUX ||
// SANITIZER_NETBSD || SANITIZER_SOLARIS
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