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1592 lines
50 KiB
1592 lines
50 KiB
//===-- msan_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 MemorySanitizer.
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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 "msan.h"
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#include "msan_chained_origin_depot.h"
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#include "msan_origin.h"
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#include "msan_thread.h"
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#include "msan_poisoning.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_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 __msan;
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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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#if SANITIZER_FREEBSD
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#define __errno_location __error
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#endif
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// True if this is a nested interceptor.
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static THREADLOCAL int in_interceptor_scope;
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extern "C" int *__errno_location(void);
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struct InterceptorScope {
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InterceptorScope() { ++in_interceptor_scope; }
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~InterceptorScope() { --in_interceptor_scope; }
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};
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bool IsInInterceptorScope() {
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return in_interceptor_scope;
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}
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#define ENSURE_MSAN_INITED() do { \
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CHECK(!msan_init_is_running); \
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if (!msan_inited) { \
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__msan_init(); \
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} \
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} while (0)
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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 = __msan_test_shadow(x, n); \
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if (__msan::IsInSymbolizer()) \
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break; \
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if (offset >= 0 && __msan::flags()->report_umrs) { \
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GET_CALLER_PC_BP_SP; \
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(void) sp; \
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ReportUMRInsideAddressRange(__func__, x, n, offset); \
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__msan::PrintWarningWithOrigin( \
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pc, bp, __msan_get_origin((const char *)x + offset)); \
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if (__msan::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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#define CHECK_UNPOISONED_STRING(x, n) \
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CHECK_UNPOISONED_STRING_OF_LEN((x), internal_strlen(x), (n))
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INTERCEPTOR(SIZE_T, fread, void *ptr, SIZE_T size, SIZE_T nmemb, void *file) {
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ENSURE_MSAN_INITED();
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SIZE_T res = REAL(fread)(ptr, size, nmemb, file);
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if (res > 0)
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__msan_unpoison(ptr, res *size);
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return res;
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}
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#if !SANITIZER_FREEBSD
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INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb,
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void *file) {
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ENSURE_MSAN_INITED();
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SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file);
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if (res > 0)
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__msan_unpoison(ptr, res *size);
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return res;
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}
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#define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED INTERCEPT_FUNCTION(fread_unlocked)
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#else
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#define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED
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#endif
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INTERCEPTOR(SSIZE_T, readlink, const char *path, char *buf, SIZE_T bufsiz) {
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ENSURE_MSAN_INITED();
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CHECK_UNPOISONED_STRING(path, 0)
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SSIZE_T res = REAL(readlink)(path, buf, bufsiz);
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if (res > 0)
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__msan_unpoison(buf, res);
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return res;
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}
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INTERCEPTOR(void *, memcpy, void *dest, const void *src, SIZE_T n) {
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return __msan_memcpy(dest, src, n);
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}
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INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
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return (char *)__msan_memcpy(dest, src, n) + n;
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}
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INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) {
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ENSURE_MSAN_INITED();
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void *res = REAL(memccpy)(dest, src, c, n);
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CHECK(!res || (res >= dest && res <= (char *)dest + n));
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SIZE_T sz = res ? (char *)res - (char *)dest : n;
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CHECK_UNPOISONED(src, sz);
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__msan_unpoison(dest, sz);
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return res;
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}
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INTERCEPTOR(void *, memmove, void *dest, const void *src, SIZE_T n) {
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return __msan_memmove(dest, src, n);
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}
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INTERCEPTOR(void *, memset, void *s, int c, SIZE_T n) {
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return __msan_memset(s, c, n);
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}
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INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) {
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return __msan_memmove(dest, src, n);
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}
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INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
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GET_MALLOC_STACK_TRACE;
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CHECK_EQ(alignment & (alignment - 1), 0);
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CHECK_NE(memptr, 0);
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*memptr = MsanReallocate(&stack, nullptr, size, alignment, false);
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CHECK_NE(*memptr, 0);
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__msan_unpoison(memptr, sizeof(*memptr));
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return 0;
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}
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#if !SANITIZER_FREEBSD
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INTERCEPTOR(void *, memalign, SIZE_T boundary, SIZE_T size) {
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GET_MALLOC_STACK_TRACE;
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CHECK_EQ(boundary & (boundary - 1), 0);
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void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
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return ptr;
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}
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#define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
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#else
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#define MSAN_MAYBE_INTERCEPT_MEMALIGN
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#endif
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INTERCEPTOR(void *, aligned_alloc, SIZE_T boundary, SIZE_T size) {
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GET_MALLOC_STACK_TRACE;
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CHECK_EQ(boundary & (boundary - 1), 0);
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void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
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return ptr;
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}
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INTERCEPTOR(void *, __libc_memalign, SIZE_T boundary, SIZE_T size) {
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GET_MALLOC_STACK_TRACE;
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CHECK_EQ(boundary & (boundary - 1), 0);
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void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
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DTLS_on_libc_memalign(ptr, size);
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return ptr;
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}
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INTERCEPTOR(void *, valloc, SIZE_T size) {
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GET_MALLOC_STACK_TRACE;
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void *ptr = MsanReallocate(&stack, nullptr, size, GetPageSizeCached(), false);
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return ptr;
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}
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#if !SANITIZER_FREEBSD
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INTERCEPTOR(void *, pvalloc, SIZE_T size) {
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GET_MALLOC_STACK_TRACE;
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uptr PageSize = GetPageSizeCached();
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size = RoundUpTo(size, PageSize);
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if (size == 0) {
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// pvalloc(0) should allocate one page.
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size = PageSize;
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}
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void *ptr = MsanReallocate(&stack, nullptr, size, PageSize, false);
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return ptr;
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}
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#define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
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#else
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#define MSAN_MAYBE_INTERCEPT_PVALLOC
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#endif
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INTERCEPTOR(void, free, void *ptr) {
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GET_MALLOC_STACK_TRACE;
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if (!ptr) return;
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MsanDeallocate(&stack, ptr);
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}
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#if !SANITIZER_FREEBSD
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INTERCEPTOR(void, cfree, void *ptr) {
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GET_MALLOC_STACK_TRACE;
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if (!ptr) return;
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MsanDeallocate(&stack, ptr);
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}
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#define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
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#else
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#define MSAN_MAYBE_INTERCEPT_CFREE
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#endif
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INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
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return __sanitizer_get_allocated_size(ptr);
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}
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#if !SANITIZER_FREEBSD
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// This function actually returns a struct by value, but we can't unpoison a
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// temporary! The following is equivalent on all supported platforms but
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// aarch64 (which uses a different register for sret value). We have a test
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// to confirm that.
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INTERCEPTOR(void, mallinfo, __sanitizer_mallinfo *sret) {
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#ifdef __aarch64__
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uptr r8;
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asm volatile("mov %0,x8" : "=r" (r8));
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sret = reinterpret_cast<__sanitizer_mallinfo*>(r8);
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#endif
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REAL(memset)(sret, 0, sizeof(*sret));
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__msan_unpoison(sret, sizeof(*sret));
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}
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#define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
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#else
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#define MSAN_MAYBE_INTERCEPT_MALLINFO
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#endif
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#if !SANITIZER_FREEBSD
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INTERCEPTOR(int, mallopt, int cmd, int value) {
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return -1;
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}
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#define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
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#else
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#define MSAN_MAYBE_INTERCEPT_MALLOPT
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#endif
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#if !SANITIZER_FREEBSD
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INTERCEPTOR(void, malloc_stats, void) {
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// FIXME: implement, but don't call REAL(malloc_stats)!
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}
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#define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
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#else
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#define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
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#endif
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INTERCEPTOR(char *, strcpy, char *dest, const char *src) { // NOLINT
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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SIZE_T n = REAL(strlen)(src);
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CHECK_UNPOISONED_STRING(src + n, 0);
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char *res = REAL(strcpy)(dest, src); // NOLINT
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CopyShadowAndOrigin(dest, src, n + 1, &stack);
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return res;
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}
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INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { // NOLINT
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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SIZE_T copy_size = REAL(strnlen)(src, n);
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if (copy_size < n)
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copy_size++; // trailing \0
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char *res = REAL(strncpy)(dest, src, n); // NOLINT
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CopyShadowAndOrigin(dest, src, copy_size, &stack);
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__msan_unpoison(dest + copy_size, n - copy_size);
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return res;
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}
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INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { // NOLINT
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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SIZE_T n = REAL(strlen)(src);
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CHECK_UNPOISONED_STRING(src + n, 0);
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char *res = REAL(stpcpy)(dest, src); // NOLINT
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CopyShadowAndOrigin(dest, src, n + 1, &stack);
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return res;
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}
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INTERCEPTOR(char *, strdup, char *src) {
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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// On FreeBSD strdup() leverages strlen().
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InterceptorScope interceptor_scope;
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SIZE_T n = REAL(strlen)(src);
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CHECK_UNPOISONED_STRING(src + n, 0);
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char *res = REAL(strdup)(src);
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CopyShadowAndOrigin(res, src, n + 1, &stack);
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return res;
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}
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#if !SANITIZER_FREEBSD
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INTERCEPTOR(char *, __strdup, char *src) {
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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SIZE_T n = REAL(strlen)(src);
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CHECK_UNPOISONED_STRING(src + n, 0);
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char *res = REAL(__strdup)(src);
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CopyShadowAndOrigin(res, src, n + 1, &stack);
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return res;
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}
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#define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
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#else
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#define MSAN_MAYBE_INTERCEPT___STRDUP
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#endif
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INTERCEPTOR(char *, strndup, char *src, SIZE_T n) {
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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// On FreeBSD strndup() leverages strnlen().
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InterceptorScope interceptor_scope;
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SIZE_T copy_size = REAL(strnlen)(src, n);
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char *res = REAL(strndup)(src, n);
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CopyShadowAndOrigin(res, src, copy_size, &stack);
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__msan_unpoison(res + copy_size, 1); // \0
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return res;
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}
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#if !SANITIZER_FREEBSD
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INTERCEPTOR(char *, __strndup, char *src, SIZE_T n) {
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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SIZE_T copy_size = REAL(strnlen)(src, n);
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char *res = REAL(__strndup)(src, n);
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CopyShadowAndOrigin(res, src, copy_size, &stack);
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__msan_unpoison(res + copy_size, 1); // \0
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return res;
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}
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#define MSAN_MAYBE_INTERCEPT___STRNDUP INTERCEPT_FUNCTION(__strndup)
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#else
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#define MSAN_MAYBE_INTERCEPT___STRNDUP
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#endif
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INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
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ENSURE_MSAN_INITED();
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char *res = REAL(gcvt)(number, ndigit, buf);
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SIZE_T n = REAL(strlen)(buf);
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__msan_unpoison(buf, n + 1);
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return res;
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}
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INTERCEPTOR(char *, strcat, char *dest, const char *src) { // NOLINT
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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SIZE_T src_size = REAL(strlen)(src);
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SIZE_T dest_size = REAL(strlen)(dest);
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CHECK_UNPOISONED_STRING(src + src_size, 0);
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CHECK_UNPOISONED_STRING(dest + dest_size, 0);
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char *res = REAL(strcat)(dest, src); // NOLINT
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CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
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return res;
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}
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INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { // NOLINT
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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SIZE_T dest_size = REAL(strlen)(dest);
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SIZE_T copy_size = REAL(strnlen)(src, n);
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CHECK_UNPOISONED_STRING(dest + dest_size, 0);
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char *res = REAL(strncat)(dest, src, n); // NOLINT
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CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
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__msan_unpoison(dest + dest_size + copy_size, 1); // \0
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return res;
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}
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// Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to
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// deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO.
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#define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \
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ENSURE_MSAN_INITED(); \
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ret_type res = REAL(func)(__VA_ARGS__); \
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__msan_unpoison(endptr, sizeof(*endptr)); \
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return res;
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#define INTERCEPTOR_STRTO(ret_type, func, char_type) \
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INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \
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INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \
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}
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#define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
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INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
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int base) { \
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INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \
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}
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#define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \
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INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
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void *loc) { \
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INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \
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}
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#define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \
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INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
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int base, void *loc) { \
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INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \
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}
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#define INTERCEPTORS_STRTO(ret_type, func, char_type) \
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INTERCEPTOR_STRTO(ret_type, func, char_type) \
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INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \
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INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \
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INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type)
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#define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
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INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
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|
INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) \
|
|
INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_l, char_type) \
|
|
INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_internal, char_type)
|
|
|
|
INTERCEPTORS_STRTO(double, strtod, char) // NOLINT
|
|
INTERCEPTORS_STRTO(float, strtof, char) // NOLINT
|
|
INTERCEPTORS_STRTO(long double, strtold, char) // NOLINT
|
|
INTERCEPTORS_STRTO_BASE(long, strtol, char) // NOLINT
|
|
INTERCEPTORS_STRTO_BASE(long long, strtoll, char) // NOLINT
|
|
INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char) // NOLINT
|
|
INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char) // NOLINT
|
|
|
|
INTERCEPTORS_STRTO(double, wcstod, wchar_t) // NOLINT
|
|
INTERCEPTORS_STRTO(float, wcstof, wchar_t) // NOLINT
|
|
INTERCEPTORS_STRTO(long double, wcstold, wchar_t) // NOLINT
|
|
INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t) // NOLINT
|
|
INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t) // NOLINT
|
|
INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t) // NOLINT
|
|
INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t) // NOLINT
|
|
|
|
#define INTERCEPT_STRTO(func) \
|
|
INTERCEPT_FUNCTION(func); \
|
|
INTERCEPT_FUNCTION(func##_l); \
|
|
INTERCEPT_FUNCTION(__##func##_l); \
|
|
INTERCEPT_FUNCTION(__##func##_internal);
|
|
|
|
|
|
// FIXME: support *wprintf in common format interceptors.
|
|
INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(vswprintf)(str, size, format, ap);
|
|
if (res >= 0) {
|
|
__msan_unpoison(str, 4 * (res + 1));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) {
|
|
ENSURE_MSAN_INITED();
|
|
va_list ap;
|
|
va_start(ap, format);
|
|
int res = vswprintf(str, size, format, ap);
|
|
va_end(ap);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(SIZE_T, strxfrm, char *dest, const char *src, SIZE_T n) {
|
|
ENSURE_MSAN_INITED();
|
|
CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
|
|
SIZE_T res = REAL(strxfrm)(dest, src, n);
|
|
if (res < n) __msan_unpoison(dest, res + 1);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(SIZE_T, strxfrm_l, char *dest, const char *src, SIZE_T n,
|
|
void *loc) {
|
|
ENSURE_MSAN_INITED();
|
|
CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
|
|
SIZE_T res = REAL(strxfrm_l)(dest, src, n, loc);
|
|
if (res < n) __msan_unpoison(dest, res + 1);
|
|
return res;
|
|
}
|
|
|
|
#define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
|
|
ENSURE_MSAN_INITED(); \
|
|
ret_type res = REAL(func)(s, __VA_ARGS__); \
|
|
if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1)); \
|
|
return res;
|
|
|
|
INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
|
|
__sanitizer_tm *tm) {
|
|
INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm);
|
|
}
|
|
|
|
INTERCEPTOR(SIZE_T, strftime_l, char *s, SIZE_T max, const char *format,
|
|
__sanitizer_tm *tm, void *loc) {
|
|
INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime_l, s, max, format, tm, loc);
|
|
}
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(SIZE_T, __strftime_l, char *s, SIZE_T max, const char *format,
|
|
__sanitizer_tm *tm, void *loc) {
|
|
INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, __strftime_l, s, max, format, tm,
|
|
loc);
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT___STRFTIME_L INTERCEPT_FUNCTION(__strftime_l)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT___STRFTIME_L
|
|
#endif
|
|
|
|
INTERCEPTOR(SIZE_T, wcsftime, wchar_t *s, SIZE_T max, const wchar_t *format,
|
|
__sanitizer_tm *tm) {
|
|
INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime, s, max, format, tm);
|
|
}
|
|
|
|
INTERCEPTOR(SIZE_T, wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
|
|
__sanitizer_tm *tm, void *loc) {
|
|
INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime_l, s, max, format, tm,
|
|
loc);
|
|
}
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(SIZE_T, __wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
|
|
__sanitizer_tm *tm, void *loc) {
|
|
INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, __wcsftime_l, s, max, format, tm,
|
|
loc);
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT___WCSFTIME_L INTERCEPT_FUNCTION(__wcsftime_l)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT___WCSFTIME_L
|
|
#endif
|
|
|
|
INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(mbtowc)(dest, src, n);
|
|
if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, mbrtowc, wchar_t *dest, const char *src, SIZE_T n, void *ps) {
|
|
ENSURE_MSAN_INITED();
|
|
SIZE_T res = REAL(mbrtowc)(dest, src, n, ps);
|
|
if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(SIZE_T, wcslen, const wchar_t *s) {
|
|
ENSURE_MSAN_INITED();
|
|
SIZE_T res = REAL(wcslen)(s);
|
|
CHECK_UNPOISONED(s, sizeof(wchar_t) * (res + 1));
|
|
return res;
|
|
}
|
|
|
|
// wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
|
|
INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
|
|
ENSURE_MSAN_INITED();
|
|
wchar_t *res = REAL(wcschr)(s, wc, ps);
|
|
return res;
|
|
}
|
|
|
|
// wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
|
|
INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
|
|
ENSURE_MSAN_INITED();
|
|
GET_STORE_STACK_TRACE;
|
|
wchar_t *res = REAL(wcscpy)(dest, src);
|
|
CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1),
|
|
&stack);
|
|
return res;
|
|
}
|
|
|
|
// wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n);
|
|
INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
|
|
ENSURE_MSAN_INITED();
|
|
GET_STORE_STACK_TRACE;
|
|
wchar_t *res = REAL(wmemcpy)(dest, src, n);
|
|
CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
|
|
ENSURE_MSAN_INITED();
|
|
GET_STORE_STACK_TRACE;
|
|
wchar_t *res = REAL(wmempcpy)(dest, src, n);
|
|
CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) {
|
|
CHECK(MEM_IS_APP(s));
|
|
ENSURE_MSAN_INITED();
|
|
wchar_t *res = REAL(wmemset)(s, c, n);
|
|
__msan_unpoison(s, n * sizeof(wchar_t));
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) {
|
|
ENSURE_MSAN_INITED();
|
|
GET_STORE_STACK_TRACE;
|
|
wchar_t *res = REAL(wmemmove)(dest, src, n);
|
|
MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(wcscmp)(s1, s2);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(gettimeofday)(tv, tz);
|
|
if (tv)
|
|
__msan_unpoison(tv, 16);
|
|
if (tz)
|
|
__msan_unpoison(tz, 8);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) {
|
|
ENSURE_MSAN_INITED();
|
|
char *res = REAL(fcvt)(x, a, b, c);
|
|
__msan_unpoison(b, sizeof(*b));
|
|
__msan_unpoison(c, sizeof(*c));
|
|
if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(char *, getenv, char *name) {
|
|
if (msan_init_is_running)
|
|
return REAL(getenv)(name);
|
|
ENSURE_MSAN_INITED();
|
|
char *res = REAL(getenv)(name);
|
|
if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
|
|
return res;
|
|
}
|
|
|
|
extern char **environ;
|
|
|
|
static void UnpoisonEnviron() {
|
|
char **envp = environ;
|
|
for (; *envp; ++envp) {
|
|
__msan_unpoison(envp, sizeof(*envp));
|
|
__msan_unpoison(*envp, REAL(strlen)(*envp) + 1);
|
|
}
|
|
// Trailing NULL pointer.
|
|
__msan_unpoison(envp, sizeof(*envp));
|
|
}
|
|
|
|
INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) {
|
|
ENSURE_MSAN_INITED();
|
|
CHECK_UNPOISONED_STRING(name, 0)
|
|
int res = REAL(setenv)(name, value, overwrite);
|
|
if (!res) UnpoisonEnviron();
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, putenv, char *string) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(putenv)(string);
|
|
if (!res) UnpoisonEnviron();
|
|
return res;
|
|
}
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(__fxstat)(magic, fd, buf);
|
|
if (!res)
|
|
__msan_unpoison(buf, __sanitizer::struct_stat_sz);
|
|
return res;
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT___FXSTAT INTERCEPT_FUNCTION(__fxstat)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT___FXSTAT
|
|
#endif
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(__fxstat64)(magic, fd, buf);
|
|
if (!res)
|
|
__msan_unpoison(buf, __sanitizer::struct_stat64_sz);
|
|
return res;
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT___FXSTAT64 INTERCEPT_FUNCTION(__fxstat64)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT___FXSTAT64
|
|
#endif
|
|
|
|
#if SANITIZER_FREEBSD
|
|
INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(fstatat)(fd, pathname, buf, flags);
|
|
if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
|
|
return res;
|
|
}
|
|
# define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(fstatat)
|
|
#else
|
|
INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
|
|
int flags) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags);
|
|
if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
|
|
return res;
|
|
}
|
|
# define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(__fxstatat)
|
|
#endif
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
|
|
int flags) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags);
|
|
if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
|
|
return res;
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT___FXSTATAT64 INTERCEPT_FUNCTION(__fxstatat64)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT___FXSTATAT64
|
|
#endif
|
|
|
|
INTERCEPTOR(int, pipe, int pipefd[2]) {
|
|
if (msan_init_is_running)
|
|
return REAL(pipe)(pipefd);
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(pipe)(pipefd);
|
|
if (!res)
|
|
__msan_unpoison(pipefd, sizeof(int[2]));
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, pipe2, int pipefd[2], int flags) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(pipe2)(pipefd, flags);
|
|
if (!res)
|
|
__msan_unpoison(pipefd, sizeof(int[2]));
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(socketpair)(domain, type, protocol, sv);
|
|
if (!res)
|
|
__msan_unpoison(sv, sizeof(int[2]));
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(char *, fgets, char *s, int size, void *stream) {
|
|
ENSURE_MSAN_INITED();
|
|
char *res = REAL(fgets)(s, size, stream);
|
|
if (res)
|
|
__msan_unpoison(s, REAL(strlen)(s) + 1);
|
|
return res;
|
|
}
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) {
|
|
ENSURE_MSAN_INITED();
|
|
char *res = REAL(fgets_unlocked)(s, size, stream);
|
|
if (res)
|
|
__msan_unpoison(s, REAL(strlen)(s) + 1);
|
|
return res;
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED
|
|
#endif
|
|
|
|
INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
|
|
if (msan_init_is_running)
|
|
return REAL(getrlimit)(resource, rlim);
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(getrlimit)(resource, rlim);
|
|
if (!res)
|
|
__msan_unpoison(rlim, __sanitizer::struct_rlimit_sz);
|
|
return res;
|
|
}
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(int, getrlimit64, int resource, void *rlim) {
|
|
if (msan_init_is_running) return REAL(getrlimit64)(resource, rlim);
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(getrlimit64)(resource, rlim);
|
|
if (!res) __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, prlimit, int pid, int resource, void *new_rlimit,
|
|
void *old_rlimit) {
|
|
if (msan_init_is_running)
|
|
return REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
|
|
ENSURE_MSAN_INITED();
|
|
CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit_sz);
|
|
int res = REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
|
|
if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit_sz);
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, prlimit64, int pid, int resource, void *new_rlimit,
|
|
void *old_rlimit) {
|
|
if (msan_init_is_running)
|
|
return REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
|
|
ENSURE_MSAN_INITED();
|
|
CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit64_sz);
|
|
int res = REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
|
|
if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit64_sz);
|
|
return res;
|
|
}
|
|
|
|
#define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64)
|
|
#define MSAN_MAYBE_INTERCEPT_PRLIMIT INTERCEPT_FUNCTION(prlimit)
|
|
#define MSAN_MAYBE_INTERCEPT_PRLIMIT64 INTERCEPT_FUNCTION(prlimit64)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
|
|
#define MSAN_MAYBE_INTERCEPT_PRLIMIT
|
|
#define MSAN_MAYBE_INTERCEPT_PRLIMIT64
|
|
#endif
|
|
|
|
#if SANITIZER_FREEBSD
|
|
// FreeBSD's <sys/utsname.h> define uname() as
|
|
// static __inline int uname(struct utsname *name) {
|
|
// return __xuname(SYS_NMLN, (void*)name);
|
|
// }
|
|
INTERCEPTOR(int, __xuname, int size, void *utsname) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(__xuname)(size, utsname);
|
|
if (!res)
|
|
__msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
|
|
return res;
|
|
}
|
|
#define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(__xuname)
|
|
#else
|
|
INTERCEPTOR(int, uname, struct utsname *utsname) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(uname)(utsname);
|
|
if (!res)
|
|
__msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
|
|
return res;
|
|
}
|
|
#define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(uname)
|
|
#endif
|
|
|
|
INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(gethostname)(name, len);
|
|
if (!res) {
|
|
SIZE_T real_len = REAL(strnlen)(name, len);
|
|
if (real_len < len)
|
|
++real_len;
|
|
__msan_unpoison(name, real_len);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents,
|
|
int timeout) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(epoll_wait)(epfd, events, maxevents, timeout);
|
|
if (res > 0) {
|
|
__msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
|
|
}
|
|
return res;
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT INTERCEPT_FUNCTION(epoll_wait)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT
|
|
#endif
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents,
|
|
int timeout, void *sigmask) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask);
|
|
if (res > 0) {
|
|
__msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
|
|
}
|
|
return res;
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT INTERCEPT_FUNCTION(epoll_pwait)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT
|
|
#endif
|
|
|
|
INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
|
|
GET_MALLOC_STACK_TRACE;
|
|
if (UNLIKELY(!msan_inited)) {
|
|
// Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
|
|
const SIZE_T kCallocPoolSize = 1024;
|
|
static uptr calloc_memory_for_dlsym[kCallocPoolSize];
|
|
static SIZE_T allocated;
|
|
SIZE_T 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;
|
|
}
|
|
return MsanCalloc(&stack, nmemb, size);
|
|
}
|
|
|
|
INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
|
|
GET_MALLOC_STACK_TRACE;
|
|
return MsanReallocate(&stack, ptr, size, sizeof(u64), false);
|
|
}
|
|
|
|
INTERCEPTOR(void *, malloc, SIZE_T size) {
|
|
GET_MALLOC_STACK_TRACE;
|
|
return MsanReallocate(&stack, nullptr, size, sizeof(u64), false);
|
|
}
|
|
|
|
void __msan_allocated_memory(const void *data, uptr size) {
|
|
GET_MALLOC_STACK_TRACE;
|
|
if (flags()->poison_in_malloc) {
|
|
stack.tag = STACK_TRACE_TAG_POISON;
|
|
PoisonMemory(data, size, &stack);
|
|
}
|
|
}
|
|
|
|
void __msan_copy_shadow(void *dest, const void *src, uptr n) {
|
|
GET_STORE_STACK_TRACE;
|
|
MoveShadowAndOrigin(dest, src, n, &stack);
|
|
}
|
|
|
|
void __sanitizer_dtor_callback(const void *data, uptr size) {
|
|
GET_MALLOC_STACK_TRACE;
|
|
if (flags()->poison_in_dtor) {
|
|
stack.tag = STACK_TRACE_TAG_POISON;
|
|
PoisonMemory(data, size, &stack);
|
|
}
|
|
}
|
|
|
|
INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
|
|
int fd, OFF_T offset) {
|
|
if (msan_init_is_running)
|
|
return REAL(mmap)(addr, length, prot, flags, fd, offset);
|
|
ENSURE_MSAN_INITED();
|
|
if (addr && !MEM_IS_APP(addr)) {
|
|
if (flags & map_fixed) {
|
|
*__errno_location() = errno_EINVAL;
|
|
return (void *)-1;
|
|
} else {
|
|
addr = nullptr;
|
|
}
|
|
}
|
|
void *res = REAL(mmap)(addr, length, prot, flags, fd, offset);
|
|
if (res != (void*)-1)
|
|
__msan_unpoison(res, RoundUpTo(length, GetPageSize()));
|
|
return res;
|
|
}
|
|
|
|
#if !SANITIZER_FREEBSD
|
|
INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
|
|
int fd, OFF64_T offset) {
|
|
ENSURE_MSAN_INITED();
|
|
if (addr && !MEM_IS_APP(addr)) {
|
|
if (flags & map_fixed) {
|
|
*__errno_location() = errno_EINVAL;
|
|
return (void *)-1;
|
|
} else {
|
|
addr = nullptr;
|
|
}
|
|
}
|
|
void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
|
|
if (res != (void*)-1)
|
|
__msan_unpoison(res, RoundUpTo(length, GetPageSize()));
|
|
return res;
|
|
}
|
|
#define MSAN_MAYBE_INTERCEPT_MMAP64 INTERCEPT_FUNCTION(mmap64)
|
|
#else
|
|
#define MSAN_MAYBE_INTERCEPT_MMAP64
|
|
#endif
|
|
|
|
INTERCEPTOR(int, getrusage, int who, void *usage) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(getrusage)(who, usage);
|
|
if (res == 0) {
|
|
__msan_unpoison(usage, __sanitizer::struct_rusage_sz);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
class SignalHandlerScope {
|
|
public:
|
|
SignalHandlerScope() {
|
|
if (MsanThread *t = GetCurrentThread())
|
|
t->EnterSignalHandler();
|
|
}
|
|
~SignalHandlerScope() {
|
|
if (MsanThread *t = GetCurrentThread())
|
|
t->LeaveSignalHandler();
|
|
}
|
|
};
|
|
|
|
// sigactions_mu guarantees atomicity of sigaction() and signal() calls.
|
|
// Access to sigactions[] is gone with relaxed atomics to avoid data race with
|
|
// the signal handler.
|
|
const int kMaxSignals = 1024;
|
|
static atomic_uintptr_t sigactions[kMaxSignals];
|
|
static StaticSpinMutex sigactions_mu;
|
|
|
|
static void SignalHandler(int signo) {
|
|
SignalHandlerScope signal_handler_scope;
|
|
ScopedThreadLocalStateBackup stlsb;
|
|
UnpoisonParam(1);
|
|
|
|
typedef void (*signal_cb)(int x);
|
|
signal_cb cb =
|
|
(signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
|
|
cb(signo);
|
|
}
|
|
|
|
static void SignalAction(int signo, void *si, void *uc) {
|
|
SignalHandlerScope signal_handler_scope;
|
|
ScopedThreadLocalStateBackup stlsb;
|
|
UnpoisonParam(3);
|
|
__msan_unpoison(si, sizeof(__sanitizer_sigaction));
|
|
__msan_unpoison(uc, __sanitizer::ucontext_t_sz);
|
|
|
|
typedef void (*sigaction_cb)(int, void *, void *);
|
|
sigaction_cb cb =
|
|
(sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
|
|
cb(signo, si, uc);
|
|
}
|
|
|
|
INTERCEPTOR(int, sigaction, int signo, const __sanitizer_sigaction *act,
|
|
__sanitizer_sigaction *oldact) {
|
|
ENSURE_MSAN_INITED();
|
|
// FIXME: check that *act is unpoisoned.
|
|
// That requires intercepting all of sigemptyset, sigfillset, etc.
|
|
int res;
|
|
if (flags()->wrap_signals) {
|
|
SpinMutexLock lock(&sigactions_mu);
|
|
CHECK_LT(signo, kMaxSignals);
|
|
uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed);
|
|
__sanitizer_sigaction new_act;
|
|
__sanitizer_sigaction *pnew_act = act ? &new_act : nullptr;
|
|
if (act) {
|
|
REAL(memcpy)(pnew_act, act, sizeof(__sanitizer_sigaction));
|
|
uptr cb = (uptr)pnew_act->sigaction;
|
|
uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo)
|
|
? (uptr)SignalAction
|
|
: (uptr)SignalHandler;
|
|
if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
|
|
atomic_store(&sigactions[signo], cb, memory_order_relaxed);
|
|
pnew_act->sigaction = (void (*)(int, void *, void *))new_cb;
|
|
}
|
|
}
|
|
res = REAL(sigaction)(signo, pnew_act, oldact);
|
|
if (res == 0 && oldact) {
|
|
uptr cb = (uptr)oldact->sigaction;
|
|
if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
|
|
oldact->sigaction = (void (*)(int, void *, void *))old_cb;
|
|
}
|
|
}
|
|
} else {
|
|
res = REAL(sigaction)(signo, act, oldact);
|
|
}
|
|
|
|
if (res == 0 && oldact) {
|
|
__msan_unpoison(oldact, sizeof(__sanitizer_sigaction));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, signal, int signo, uptr cb) {
|
|
ENSURE_MSAN_INITED();
|
|
if (flags()->wrap_signals) {
|
|
CHECK_LT(signo, kMaxSignals);
|
|
SpinMutexLock lock(&sigactions_mu);
|
|
if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
|
|
atomic_store(&sigactions[signo], cb, memory_order_relaxed);
|
|
cb = (uptr) SignalHandler;
|
|
}
|
|
return REAL(signal)(signo, cb);
|
|
} else {
|
|
return REAL(signal)(signo, cb);
|
|
}
|
|
}
|
|
|
|
extern "C" int pthread_attr_init(void *attr);
|
|
extern "C" int pthread_attr_destroy(void *attr);
|
|
|
|
static void *MsanThreadStartFunc(void *arg) {
|
|
MsanThread *t = (MsanThread *)arg;
|
|
SetCurrentThread(t);
|
|
return t->ThreadStart();
|
|
}
|
|
|
|
INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*),
|
|
void * param) {
|
|
ENSURE_MSAN_INITED(); // for GetTlsSize()
|
|
__sanitizer_pthread_attr_t myattr;
|
|
if (!attr) {
|
|
pthread_attr_init(&myattr);
|
|
attr = &myattr;
|
|
}
|
|
|
|
AdjustStackSize(attr);
|
|
|
|
MsanThread *t = MsanThread::Create(callback, param);
|
|
|
|
int res = REAL(pthread_create)(th, attr, MsanThreadStartFunc, t);
|
|
|
|
if (attr == &myattr)
|
|
pthread_attr_destroy(&myattr);
|
|
if (!res) {
|
|
__msan_unpoison(th, __sanitizer::pthread_t_sz);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key,
|
|
void (*dtor)(void *value)) {
|
|
if (msan_init_is_running) return REAL(pthread_key_create)(key, dtor);
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(pthread_key_create)(key, dtor);
|
|
if (!res && key)
|
|
__msan_unpoison(key, sizeof(*key));
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, pthread_join, void *th, void **retval) {
|
|
ENSURE_MSAN_INITED();
|
|
int res = REAL(pthread_join)(th, retval);
|
|
if (!res && retval)
|
|
__msan_unpoison(retval, sizeof(*retval));
|
|
return res;
|
|
}
|
|
|
|
extern char *tzname[2];
|
|
|
|
INTERCEPTOR(void, tzset, int fake) {
|
|
ENSURE_MSAN_INITED();
|
|
REAL(tzset)(fake);
|
|
if (tzname[0])
|
|
__msan_unpoison(tzname[0], REAL(strlen)(tzname[0]) + 1);
|
|
if (tzname[1])
|
|
__msan_unpoison(tzname[1], REAL(strlen)(tzname[1]) + 1);
|
|
return;
|
|
}
|
|
|
|
struct MSanAtExitRecord {
|
|
void (*func)(void *arg);
|
|
void *arg;
|
|
};
|
|
|
|
void MSanAtExitWrapper(void *arg) {
|
|
UnpoisonParam(1);
|
|
MSanAtExitRecord *r = (MSanAtExitRecord *)arg;
|
|
r->func(r->arg);
|
|
InternalFree(r);
|
|
}
|
|
|
|
// Unpoison argument shadow for C++ module destructors.
|
|
INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
|
|
void *dso_handle) {
|
|
if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle);
|
|
ENSURE_MSAN_INITED();
|
|
MSanAtExitRecord *r =
|
|
(MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord));
|
|
r->func = func;
|
|
r->arg = arg;
|
|
return REAL(__cxa_atexit)(MSanAtExitWrapper, r, dso_handle);
|
|
}
|
|
|
|
DECLARE_REAL(int, shmctl, int shmid, int cmd, void *buf)
|
|
|
|
INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) {
|
|
ENSURE_MSAN_INITED();
|
|
void *p = REAL(shmat)(shmid, shmaddr, shmflg);
|
|
if (p != (void *)-1) {
|
|
__sanitizer_shmid_ds ds;
|
|
int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds);
|
|
if (!res) {
|
|
__msan_unpoison(p, ds.shm_segsz);
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static void BeforeFork() {
|
|
StackDepotLockAll();
|
|
ChainedOriginDepotLockAll();
|
|
}
|
|
|
|
static void AfterFork() {
|
|
ChainedOriginDepotUnlockAll();
|
|
StackDepotUnlockAll();
|
|
}
|
|
|
|
INTERCEPTOR(int, fork, void) {
|
|
ENSURE_MSAN_INITED();
|
|
BeforeFork();
|
|
int pid = REAL(fork)();
|
|
AfterFork();
|
|
return pid;
|
|
}
|
|
|
|
INTERCEPTOR(int, openpty, int *amaster, int *aslave, char *name,
|
|
const void *termp, const void *winp) {
|
|
ENSURE_MSAN_INITED();
|
|
InterceptorScope interceptor_scope;
|
|
int res = REAL(openpty)(amaster, aslave, name, termp, winp);
|
|
if (!res) {
|
|
__msan_unpoison(amaster, sizeof(*amaster));
|
|
__msan_unpoison(aslave, sizeof(*aslave));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
INTERCEPTOR(int, forkpty, int *amaster, char *name, const void *termp,
|
|
const void *winp) {
|
|
ENSURE_MSAN_INITED();
|
|
InterceptorScope interceptor_scope;
|
|
int res = REAL(forkpty)(amaster, name, termp, winp);
|
|
if (res != -1)
|
|
__msan_unpoison(amaster, sizeof(*amaster));
|
|
return res;
|
|
}
|
|
|
|
struct MSanInterceptorContext {
|
|
bool in_interceptor_scope;
|
|
};
|
|
|
|
namespace __msan {
|
|
|
|
int OnExit() {
|
|
// FIXME: ask frontend whether we need to return failure.
|
|
return 0;
|
|
}
|
|
|
|
} // namespace __msan
|
|
|
|
// A version of CHECK_UNPOISONED using a saved scope value. Used in common
|
|
// interceptors.
|
|
#define CHECK_UNPOISONED_CTX(ctx, x, n) \
|
|
do { \
|
|
if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \
|
|
CHECK_UNPOISONED_0(x, n); \
|
|
} while (0)
|
|
|
|
#define MSAN_INTERCEPT_FUNC(name) \
|
|
do { \
|
|
if ((!INTERCEPT_FUNCTION(name) || !REAL(name))) \
|
|
VReport(1, "MemorySanitizer: failed to intercept '" #name "'\n"); \
|
|
} while (0)
|
|
|
|
#define MSAN_INTERCEPT_FUNC_VER(name, ver) \
|
|
do { \
|
|
if ((!INTERCEPT_FUNCTION_VER(name, ver) || !REAL(name))) \
|
|
VReport( \
|
|
1, "MemorySanitizer: failed to intercept '" #name "@@" #ver "'\n"); \
|
|
} while (0)
|
|
|
|
#define COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name)
|
|
#define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
|
|
MSAN_INTERCEPT_FUNC_VER(name, ver)
|
|
#define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) \
|
|
UnpoisonParam(count)
|
|
#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
|
|
__msan_unpoison(ptr, size)
|
|
#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
|
|
CHECK_UNPOISONED_CTX(ctx, ptr, size)
|
|
#define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \
|
|
__msan_unpoison(ptr, size)
|
|
#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
|
|
if (msan_init_is_running) return REAL(func)(__VA_ARGS__); \
|
|
ENSURE_MSAN_INITED(); \
|
|
MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \
|
|
ctx = (void *)&msan_ctx; \
|
|
(void)ctx; \
|
|
InterceptorScope interceptor_scope; \
|
|
__msan_unpoison(__errno_location(), sizeof(int)); /* NOLINT */
|
|
#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
|
|
do { \
|
|
} while (false)
|
|
#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
|
|
do { \
|
|
} while (false)
|
|
#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
|
|
do { \
|
|
} while (false)
|
|
#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
|
|
do { \
|
|
} while (false)
|
|
#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
|
|
do { \
|
|
} while (false) // FIXME
|
|
#define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
|
|
do { \
|
|
} while (false) // FIXME
|
|
#define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
|
|
#define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
|
|
#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
|
|
do { \
|
|
link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \
|
|
if (filename && map) \
|
|
ForEachMappedRegion(map, __msan_unpoison); \
|
|
} while (false)
|
|
|
|
#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
|
|
if (MsanThread *t = GetCurrentThread()) { \
|
|
*begin = t->tls_begin(); \
|
|
*end = t->tls_end(); \
|
|
} else { \
|
|
*begin = *end = 0; \
|
|
}
|
|
|
|
#include "sanitizer_common/sanitizer_platform_interceptors.h"
|
|
// Msan needs custom handling of these:
|
|
#undef SANITIZER_INTERCEPT_MEMSET
|
|
#undef SANITIZER_INTERCEPT_MEMMOVE
|
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#undef SANITIZER_INTERCEPT_MEMCPY
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#include "sanitizer_common/sanitizer_common_interceptors.inc"
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#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
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#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
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do { \
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} while (false)
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#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
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do { \
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} while (false)
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#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
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#include "sanitizer_common/sanitizer_common_syscalls.inc"
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struct dlinfo {
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char *dli_fname;
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void *dli_fbase;
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char *dli_sname;
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void *dli_saddr;
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};
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INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
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void *ctx;
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COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
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int res = REAL(dladdr)(addr, info);
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if (res != 0) {
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__msan_unpoison(info, sizeof(*info));
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if (info->dli_fname)
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__msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1);
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if (info->dli_sname)
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__msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1);
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}
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return res;
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}
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INTERCEPTOR(char *, dlerror, int fake) {
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void *ctx;
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COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
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char *res = REAL(dlerror)(fake);
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if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
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return res;
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}
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typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
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void *data);
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struct dl_iterate_phdr_data {
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dl_iterate_phdr_cb callback;
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void *data;
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};
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static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
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void *data) {
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if (info) {
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__msan_unpoison(info, size);
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if (info->dlpi_phdr && info->dlpi_phnum)
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__msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
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if (info->dlpi_name)
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__msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1);
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}
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dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
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UnpoisonParam(3);
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return cbdata->callback(info, size, cbdata->data);
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}
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INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
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void *ctx;
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COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data);
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dl_iterate_phdr_data cbdata;
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cbdata.callback = callback;
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cbdata.data = data;
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int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
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return res;
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}
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// These interface functions reside here so that they can use
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// REAL(memset), etc.
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void __msan_unpoison(const void *a, uptr size) {
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if (!MEM_IS_APP(a)) return;
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SetShadow(a, size, 0);
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}
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void __msan_poison(const void *a, uptr size) {
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if (!MEM_IS_APP(a)) return;
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SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
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}
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void __msan_poison_stack(void *a, uptr size) {
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if (!MEM_IS_APP(a)) return;
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SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
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}
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void __msan_clear_and_unpoison(void *a, uptr size) {
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REAL(memset)(a, 0, size);
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SetShadow(a, size, 0);
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}
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void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
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if (!msan_inited) return internal_memcpy(dest, src, n);
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if (msan_init_is_running || __msan::IsInSymbolizer())
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return REAL(memcpy)(dest, src, n);
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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void *res = REAL(memcpy)(dest, src, n);
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CopyShadowAndOrigin(dest, src, n, &stack);
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return res;
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}
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void *__msan_memset(void *s, int c, SIZE_T n) {
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if (!msan_inited) return internal_memset(s, c, n);
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if (msan_init_is_running) return REAL(memset)(s, c, n);
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ENSURE_MSAN_INITED();
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void *res = REAL(memset)(s, c, n);
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__msan_unpoison(s, n);
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return res;
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}
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void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
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if (!msan_inited) return internal_memmove(dest, src, n);
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if (msan_init_is_running) return REAL(memmove)(dest, src, n);
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ENSURE_MSAN_INITED();
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GET_STORE_STACK_TRACE;
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void *res = REAL(memmove)(dest, src, n);
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MoveShadowAndOrigin(dest, src, n, &stack);
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return res;
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}
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void __msan_unpoison_string(const char* s) {
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if (!MEM_IS_APP(s)) return;
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__msan_unpoison(s, REAL(strlen)(s) + 1);
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}
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namespace __msan {
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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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InitializeCommonInterceptors();
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INTERCEPT_FUNCTION(mmap);
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MSAN_MAYBE_INTERCEPT_MMAP64;
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INTERCEPT_FUNCTION(posix_memalign);
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MSAN_MAYBE_INTERCEPT_MEMALIGN;
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INTERCEPT_FUNCTION(__libc_memalign);
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INTERCEPT_FUNCTION(valloc);
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MSAN_MAYBE_INTERCEPT_PVALLOC;
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INTERCEPT_FUNCTION(malloc);
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INTERCEPT_FUNCTION(calloc);
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INTERCEPT_FUNCTION(realloc);
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INTERCEPT_FUNCTION(free);
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MSAN_MAYBE_INTERCEPT_CFREE;
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INTERCEPT_FUNCTION(malloc_usable_size);
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MSAN_MAYBE_INTERCEPT_MALLINFO;
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MSAN_MAYBE_INTERCEPT_MALLOPT;
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MSAN_MAYBE_INTERCEPT_MALLOC_STATS;
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INTERCEPT_FUNCTION(fread);
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MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
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INTERCEPT_FUNCTION(readlink);
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INTERCEPT_FUNCTION(memcpy);
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INTERCEPT_FUNCTION(memccpy);
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INTERCEPT_FUNCTION(mempcpy);
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INTERCEPT_FUNCTION(memset);
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INTERCEPT_FUNCTION(memmove);
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INTERCEPT_FUNCTION(bcopy);
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INTERCEPT_FUNCTION(wmemset);
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INTERCEPT_FUNCTION(wmemcpy);
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INTERCEPT_FUNCTION(wmempcpy);
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INTERCEPT_FUNCTION(wmemmove);
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INTERCEPT_FUNCTION(strcpy); // NOLINT
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INTERCEPT_FUNCTION(stpcpy); // NOLINT
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INTERCEPT_FUNCTION(strdup);
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MSAN_MAYBE_INTERCEPT___STRDUP;
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INTERCEPT_FUNCTION(strndup);
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MSAN_MAYBE_INTERCEPT___STRNDUP;
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INTERCEPT_FUNCTION(strncpy); // NOLINT
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INTERCEPT_FUNCTION(gcvt);
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INTERCEPT_FUNCTION(strcat); // NOLINT
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INTERCEPT_FUNCTION(strncat); // NOLINT
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INTERCEPT_STRTO(strtod);
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INTERCEPT_STRTO(strtof);
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INTERCEPT_STRTO(strtold);
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INTERCEPT_STRTO(strtol);
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INTERCEPT_STRTO(strtoul);
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INTERCEPT_STRTO(strtoll);
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INTERCEPT_STRTO(strtoull);
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INTERCEPT_STRTO(wcstod);
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INTERCEPT_STRTO(wcstof);
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INTERCEPT_STRTO(wcstold);
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INTERCEPT_STRTO(wcstol);
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INTERCEPT_STRTO(wcstoul);
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INTERCEPT_STRTO(wcstoll);
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INTERCEPT_STRTO(wcstoull);
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#ifdef SANITIZER_NLDBL_VERSION
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INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION);
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INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION);
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#else
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INTERCEPT_FUNCTION(vswprintf);
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INTERCEPT_FUNCTION(swprintf);
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#endif
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INTERCEPT_FUNCTION(strxfrm);
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INTERCEPT_FUNCTION(strxfrm_l);
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INTERCEPT_FUNCTION(strftime);
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INTERCEPT_FUNCTION(strftime_l);
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MSAN_MAYBE_INTERCEPT___STRFTIME_L;
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INTERCEPT_FUNCTION(wcsftime);
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INTERCEPT_FUNCTION(wcsftime_l);
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MSAN_MAYBE_INTERCEPT___WCSFTIME_L;
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INTERCEPT_FUNCTION(mbtowc);
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INTERCEPT_FUNCTION(mbrtowc);
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INTERCEPT_FUNCTION(wcslen);
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INTERCEPT_FUNCTION(wcschr);
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INTERCEPT_FUNCTION(wcscpy);
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INTERCEPT_FUNCTION(wcscmp);
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INTERCEPT_FUNCTION(getenv);
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INTERCEPT_FUNCTION(setenv);
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INTERCEPT_FUNCTION(putenv);
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INTERCEPT_FUNCTION(gettimeofday);
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INTERCEPT_FUNCTION(fcvt);
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MSAN_MAYBE_INTERCEPT___FXSTAT;
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MSAN_INTERCEPT_FSTATAT;
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MSAN_MAYBE_INTERCEPT___FXSTAT64;
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MSAN_MAYBE_INTERCEPT___FXSTATAT64;
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INTERCEPT_FUNCTION(pipe);
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INTERCEPT_FUNCTION(pipe2);
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INTERCEPT_FUNCTION(socketpair);
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INTERCEPT_FUNCTION(fgets);
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MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
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INTERCEPT_FUNCTION(getrlimit);
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MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
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MSAN_MAYBE_INTERCEPT_PRLIMIT;
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MSAN_MAYBE_INTERCEPT_PRLIMIT64;
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MSAN_INTERCEPT_UNAME;
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INTERCEPT_FUNCTION(gethostname);
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MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
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MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
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INTERCEPT_FUNCTION(dladdr);
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INTERCEPT_FUNCTION(dlerror);
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INTERCEPT_FUNCTION(dl_iterate_phdr);
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INTERCEPT_FUNCTION(getrusage);
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INTERCEPT_FUNCTION(sigaction);
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INTERCEPT_FUNCTION(signal);
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#if defined(__mips__)
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INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2");
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#else
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INTERCEPT_FUNCTION(pthread_create);
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#endif
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INTERCEPT_FUNCTION(pthread_key_create);
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INTERCEPT_FUNCTION(pthread_join);
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INTERCEPT_FUNCTION(tzset);
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INTERCEPT_FUNCTION(__cxa_atexit);
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INTERCEPT_FUNCTION(shmat);
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INTERCEPT_FUNCTION(fork);
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INTERCEPT_FUNCTION(openpty);
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INTERCEPT_FUNCTION(forkpty);
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inited = 1;
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}
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} // namespace __msan
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