forked from OSchip/llvm-project
334 lines
10 KiB
C++
334 lines
10 KiB
C++
//===-- hwasan_interceptors.cc --------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of HWAddressSanitizer.
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//
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// Interceptors for standard library functions.
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//
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// FIXME: move as many interceptors as possible into
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// sanitizer_common/sanitizer_common_interceptors.h
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//===----------------------------------------------------------------------===//
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#include "interception/interception.h"
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#include "hwasan.h"
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#include "hwasan_mapping.h"
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#include "hwasan_thread.h"
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#include "hwasan_poisoning.h"
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#include "hwasan_report.h"
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#include "sanitizer_common/sanitizer_platform_limits_posix.h"
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#include "sanitizer_common/sanitizer_allocator.h"
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#include "sanitizer_common/sanitizer_allocator_interface.h"
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#include "sanitizer_common/sanitizer_allocator_internal.h"
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#include "sanitizer_common/sanitizer_atomic.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_errno.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_linux.h"
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#include "sanitizer_common/sanitizer_tls_get_addr.h"
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#include <stdarg.h>
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// ACHTUNG! No other system header includes in this file.
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// Ideally, we should get rid of stdarg.h as well.
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using namespace __hwasan;
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using __sanitizer::memory_order;
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using __sanitizer::atomic_load;
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using __sanitizer::atomic_store;
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using __sanitizer::atomic_uintptr_t;
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DECLARE_REAL(SIZE_T, strlen, const char *s)
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DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen)
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DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
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DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
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bool IsInInterceptorScope() {
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Thread *t = GetCurrentThread();
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return t && t->InInterceptorScope();
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}
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struct InterceptorScope {
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InterceptorScope() {
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Thread *t = GetCurrentThread();
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if (t)
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t->EnterInterceptorScope();
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}
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~InterceptorScope() {
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Thread *t = GetCurrentThread();
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if (t)
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t->LeaveInterceptorScope();
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}
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};
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static uptr allocated_for_dlsym;
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static const uptr kDlsymAllocPoolSize = 1024;
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static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
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static bool IsInDlsymAllocPool(const void *ptr) {
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uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
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return off < sizeof(alloc_memory_for_dlsym);
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}
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static void *AllocateFromLocalPool(uptr size_in_bytes) {
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uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
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void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
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allocated_for_dlsym += size_in_words;
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CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
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return mem;
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}
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#define ENSURE_HWASAN_INITED() do { \
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CHECK(!hwasan_init_is_running); \
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if (!hwasan_inited) { \
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__hwasan_init(); \
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} \
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} while (0)
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#define HWASAN_READ_RANGE(ctx, offset, size) \
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CHECK_UNPOISONED(offset, size)
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#define HWASAN_WRITE_RANGE(ctx, offset, size) \
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CHECK_UNPOISONED(offset, size)
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// Check that [x, x+n) range is unpoisoned.
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#define CHECK_UNPOISONED_0(x, n) \
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do { \
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sptr __offset = __hwasan_test_shadow(x, n); \
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if (__hwasan::IsInSymbolizer()) break; \
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if (__offset >= 0) { \
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GET_CALLER_PC_BP_SP; \
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(void)sp; \
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ReportInvalidAccessInsideAddressRange(__func__, x, n, __offset); \
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__hwasan::PrintWarning(pc, bp); \
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if (__hwasan::flags()->halt_on_error) { \
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Printf("Exiting\n"); \
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Die(); \
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} \
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} \
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} while (0)
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// Check that [x, x+n) range is unpoisoned unless we are in a nested
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// interceptor.
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#define CHECK_UNPOISONED(x, n) \
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do { \
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if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \
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} while (0)
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#define CHECK_UNPOISONED_STRING_OF_LEN(x, len, n) \
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CHECK_UNPOISONED((x), \
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common_flags()->strict_string_checks ? (len) + 1 : (n) )
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int __sanitizer_posix_memalign(void **memptr, uptr alignment, uptr size) {
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GET_MALLOC_STACK_TRACE;
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CHECK_NE(memptr, 0);
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int res = hwasan_posix_memalign(memptr, alignment, size, &stack);
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return res;
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}
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void * __sanitizer_memalign(uptr alignment, uptr size) {
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GET_MALLOC_STACK_TRACE;
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return hwasan_memalign(alignment, size, &stack);
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}
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void * __sanitizer_aligned_alloc(uptr alignment, uptr size) {
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GET_MALLOC_STACK_TRACE;
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return hwasan_aligned_alloc(alignment, size, &stack);
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}
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void * __sanitizer___libc_memalign(uptr alignment, uptr size) {
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GET_MALLOC_STACK_TRACE;
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void *ptr = hwasan_memalign(alignment, size, &stack);
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if (ptr)
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DTLS_on_libc_memalign(ptr, size);
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return ptr;
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}
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void * __sanitizer_valloc(uptr size) {
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GET_MALLOC_STACK_TRACE;
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return hwasan_valloc(size, &stack);
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}
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void * __sanitizer_pvalloc(uptr size) {
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GET_MALLOC_STACK_TRACE;
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return hwasan_pvalloc(size, &stack);
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}
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void __sanitizer_free(void *ptr) {
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GET_MALLOC_STACK_TRACE;
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if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
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HwasanDeallocate(&stack, ptr);
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}
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void __sanitizer_cfree(void *ptr) {
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GET_MALLOC_STACK_TRACE;
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if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
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HwasanDeallocate(&stack, ptr);
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}
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uptr __sanitizer_malloc_usable_size(const void *ptr) {
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return __sanitizer_get_allocated_size(ptr);
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}
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struct __sanitizer_struct_mallinfo __sanitizer_mallinfo() {
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__sanitizer_struct_mallinfo sret;
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internal_memset(&sret, 0, sizeof(sret));
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return sret;
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}
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int __sanitizer_mallopt(int cmd, int value) {
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return -1;
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}
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void __sanitizer_malloc_stats(void) {
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// FIXME: implement, but don't call REAL(malloc_stats)!
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}
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void * __sanitizer_calloc(uptr nmemb, uptr size) {
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GET_MALLOC_STACK_TRACE;
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if (UNLIKELY(!hwasan_inited))
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// Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
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return AllocateFromLocalPool(nmemb * size);
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return hwasan_calloc(nmemb, size, &stack);
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}
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void * __sanitizer_realloc(void *ptr, uptr size) {
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GET_MALLOC_STACK_TRACE;
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if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
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uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
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uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
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void *new_ptr;
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if (UNLIKELY(!hwasan_inited)) {
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new_ptr = AllocateFromLocalPool(copy_size);
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} else {
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copy_size = size;
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new_ptr = hwasan_malloc(copy_size, &stack);
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}
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internal_memcpy(new_ptr, ptr, copy_size);
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return new_ptr;
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}
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return hwasan_realloc(ptr, size, &stack);
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}
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void * __sanitizer_malloc(uptr size) {
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GET_MALLOC_STACK_TRACE;
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if (UNLIKELY(!hwasan_init_is_running))
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ENSURE_HWASAN_INITED();
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if (UNLIKELY(!hwasan_inited))
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// Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
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return AllocateFromLocalPool(size);
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return hwasan_malloc(size, &stack);
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}
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#if HWASAN_WITH_INTERCEPTORS
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#define INTERCEPTOR_ALIAS(RET, FN, ARGS...) \
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extern "C" SANITIZER_INTERFACE_ATTRIBUTE RET WRAP(FN)(ARGS) \
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ALIAS("__sanitizer_" #FN); \
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extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE RET FN( \
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ARGS) ALIAS("__sanitizer_" #FN)
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INTERCEPTOR_ALIAS(int, posix_memalign, void **memptr, SIZE_T alignment,
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SIZE_T size);
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INTERCEPTOR_ALIAS(void *, aligned_alloc, SIZE_T alignment, SIZE_T size);
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INTERCEPTOR_ALIAS(void *, __libc_memalign, SIZE_T alignment, SIZE_T size);
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INTERCEPTOR_ALIAS(void *, valloc, SIZE_T size);
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INTERCEPTOR_ALIAS(void, free, void *ptr);
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INTERCEPTOR_ALIAS(uptr, malloc_usable_size, const void *ptr);
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INTERCEPTOR_ALIAS(void *, calloc, SIZE_T nmemb, SIZE_T size);
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INTERCEPTOR_ALIAS(void *, realloc, void *ptr, SIZE_T size);
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INTERCEPTOR_ALIAS(void *, malloc, SIZE_T size);
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#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
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INTERCEPTOR_ALIAS(void *, memalign, SIZE_T alignment, SIZE_T size);
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INTERCEPTOR_ALIAS(void *, pvalloc, SIZE_T size);
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INTERCEPTOR_ALIAS(void, cfree, void *ptr);
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INTERCEPTOR_ALIAS(__sanitizer_struct_mallinfo, mallinfo);
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INTERCEPTOR_ALIAS(int, mallopt, int cmd, int value);
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INTERCEPTOR_ALIAS(void, malloc_stats, void);
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#endif
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#endif // HWASAN_WITH_INTERCEPTORS
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#if HWASAN_WITH_INTERCEPTORS
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extern "C" int pthread_attr_init(void *attr);
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extern "C" int pthread_attr_destroy(void *attr);
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struct ThreadStartArg {
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thread_callback_t callback;
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void *param;
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};
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static void *HwasanThreadStartFunc(void *arg) {
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__hwasan_thread_enter();
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ThreadStartArg A = *reinterpret_cast<ThreadStartArg*>(arg);
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UnmapOrDie(arg, GetPageSizeCached());
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return A.callback(A.param);
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}
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INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*),
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void * param) {
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ScopedTaggingDisabler disabler;
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ThreadStartArg *A = reinterpret_cast<ThreadStartArg *> (MmapOrDie(
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GetPageSizeCached(), "pthread_create"));
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*A = {callback, param};
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int res = REAL(pthread_create)(UntagPtr(th), UntagPtr(attr),
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&HwasanThreadStartFunc, A);
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return res;
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}
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#endif // HWASAN_WITH_INTERCEPTORS
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static void BeforeFork() {
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StackDepotLockAll();
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}
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static void AfterFork() {
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StackDepotUnlockAll();
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}
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INTERCEPTOR(int, fork, void) {
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ENSURE_HWASAN_INITED();
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BeforeFork();
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int pid = REAL(fork)();
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AfterFork();
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return pid;
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}
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struct HwasanInterceptorContext {
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bool in_interceptor_scope;
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};
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namespace __hwasan {
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int OnExit() {
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// FIXME: ask frontend whether we need to return failure.
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return 0;
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}
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} // namespace __hwasan
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namespace __hwasan {
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void InitializeInterceptors() {
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static int inited = 0;
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CHECK_EQ(inited, 0);
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INTERCEPT_FUNCTION(fork);
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#if HWASAN_WITH_INTERCEPTORS
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INTERCEPT_FUNCTION(pthread_create);
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#endif
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inited = 1;
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}
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} // namespace __hwasan
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