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llvm-project/compiler-rt/lib/msan/msan_interceptors.cpp

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//===-- msan_interceptors.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of MemorySanitizer.
//
// Interceptors for standard library functions.
//
// FIXME: move as many interceptors as possible into
// sanitizer_common/sanitizer_common_interceptors.h
//===----------------------------------------------------------------------===//
#include "interception/interception.h"
#include "msan.h"
#include "msan_chained_origin_depot.h"
#include "msan_origin.h"
#include "msan_report.h"
#include "msan_thread.h"
#include "msan_poisoning.h"
#include "sanitizer_common/sanitizer_platform_limits_posix.h"
#include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
#include "sanitizer_common/sanitizer_allocator.h"
#include "sanitizer_common/sanitizer_allocator_interface.h"
#include "sanitizer_common/sanitizer_allocator_internal.h"
#include "sanitizer_common/sanitizer_atomic.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_errno.h"
#include "sanitizer_common/sanitizer_stackdepot.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_linux.h"
#include "sanitizer_common/sanitizer_tls_get_addr.h"
#include "sanitizer_common/sanitizer_vector.h"
#if SANITIZER_NETBSD
#define fstat __fstat50
#define gettimeofday __gettimeofday50
#define getrusage __getrusage50
#define tzset __tzset50
#endif
#include <stdarg.h>
// ACHTUNG! No other system header includes in this file.
// Ideally, we should get rid of stdarg.h as well.
using namespace __msan;
using __sanitizer::memory_order;
using __sanitizer::atomic_load;
using __sanitizer::atomic_store;
using __sanitizer::atomic_uintptr_t;
DECLARE_REAL(SIZE_T, strlen, const char *s)
DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen)
DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
// True if this is a nested interceptor.
static THREADLOCAL int in_interceptor_scope;
void __msan_scoped_disable_interceptor_checks() { ++in_interceptor_scope; }
void __msan_scoped_enable_interceptor_checks() { --in_interceptor_scope; }
struct InterceptorScope {
InterceptorScope() { ++in_interceptor_scope; }
~InterceptorScope() { --in_interceptor_scope; }
};
bool IsInInterceptorScope() {
return in_interceptor_scope;
}
static uptr allocated_for_dlsym;
static const uptr kDlsymAllocPoolSize = 1024;
static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
static bool IsInDlsymAllocPool(const void *ptr) {
uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
return off < sizeof(alloc_memory_for_dlsym);
}
static void *AllocateFromLocalPool(uptr size_in_bytes) {
uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
allocated_for_dlsym += size_in_words;
CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
return mem;
}
#define ENSURE_MSAN_INITED() do { \
CHECK(!msan_init_is_running); \
if (!msan_inited) { \
__msan_init(); \
} \
} while (0)
// Check that [x, x+n) range is unpoisoned.
#define CHECK_UNPOISONED_0(x, n) \
do { \
sptr __offset = __msan_test_shadow(x, n); \
if (__msan::IsInSymbolizer()) break; \
if (__offset >= 0 && __msan::flags()->report_umrs) { \
GET_CALLER_PC_BP_SP; \
(void)sp; \
ReportUMRInsideAddressRange(__func__, x, n, __offset); \
__msan::PrintWarningWithOrigin( \
pc, bp, __msan_get_origin((const char *)x + __offset)); \
if (__msan::flags()->halt_on_error) { \
Printf("Exiting\n"); \
Die(); \
} \
} \
} while (0)
// Check that [x, x+n) range is unpoisoned unless we are in a nested
// interceptor.
#define CHECK_UNPOISONED(x, n) \
do { \
if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \
} while (0)
#define CHECK_UNPOISONED_STRING_OF_LEN(x, len, n) \
CHECK_UNPOISONED((x), \
common_flags()->strict_string_checks ? (len) + 1 : (n) )
#define CHECK_UNPOISONED_STRING(x, n) \
CHECK_UNPOISONED_STRING_OF_LEN((x), internal_strlen(x), (n))
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb,
void *file) {
ENSURE_MSAN_INITED();
SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file);
if (res > 0)
__msan_unpoison(ptr, res *size);
return res;
}
#define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED INTERCEPT_FUNCTION(fread_unlocked)
#else
#define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED
#endif
#if !SANITIZER_NETBSD
INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
return (char *)__msan_memcpy(dest, src, n) + n;
}
#define MSAN_MAYBE_INTERCEPT_MEMPCPY INTERCEPT_FUNCTION(mempcpy)
#else
#define MSAN_MAYBE_INTERCEPT_MEMPCPY
#endif
INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) {
ENSURE_MSAN_INITED();
void *res = REAL(memccpy)(dest, src, c, n);
CHECK(!res || (res >= dest && res <= (char *)dest + n));
SIZE_T sz = res ? (char *)res - (char *)dest : n;
CHECK_UNPOISONED(src, sz);
__msan_unpoison(dest, sz);
return res;
}
INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) {
return __msan_memmove(dest, src, n);
}
INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
CHECK_NE(memptr, 0);
int res = msan_posix_memalign(memptr, alignment, size, &stack);
if (!res)
__msan_unpoison(memptr, sizeof(*memptr));
return res;
}
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void *, memalign, SIZE_T alignment, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
return msan_memalign(alignment, size, &stack);
}
#define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
#else
#define MSAN_MAYBE_INTERCEPT_MEMALIGN
#endif
INTERCEPTOR(void *, aligned_alloc, SIZE_T alignment, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
return msan_aligned_alloc(alignment, size, &stack);
}
#if !SANITIZER_NETBSD
INTERCEPTOR(void *, __libc_memalign, SIZE_T alignment, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
void *ptr = msan_memalign(alignment, size, &stack);
if (ptr)
DTLS_on_libc_memalign(ptr, size);
return ptr;
}
#define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN INTERCEPT_FUNCTION(__libc_memalign)
#else
#define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN
#endif
INTERCEPTOR(void *, valloc, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
return msan_valloc(size, &stack);
}
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void *, pvalloc, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
return msan_pvalloc(size, &stack);
}
#define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
#else
#define MSAN_MAYBE_INTERCEPT_PVALLOC
#endif
INTERCEPTOR(void, free, void *ptr) {
GET_MALLOC_STACK_TRACE;
if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
MsanDeallocate(&stack, ptr);
}
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void, cfree, void *ptr) {
GET_MALLOC_STACK_TRACE;
if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
MsanDeallocate(&stack, ptr);
}
#define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
#else
#define MSAN_MAYBE_INTERCEPT_CFREE
#endif
#if !SANITIZER_NETBSD
INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
return __sanitizer_get_allocated_size(ptr);
}
#define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE \
INTERCEPT_FUNCTION(malloc_usable_size)
#else
#define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE
#endif
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
// This function actually returns a struct by value, but we can't unpoison a
// temporary! The following is equivalent on all supported platforms but
// aarch64 (which uses a different register for sret value). We have a test
// to confirm that.
INTERCEPTOR(void, mallinfo, __sanitizer_struct_mallinfo *sret) {
#ifdef __aarch64__
uptr r8;
asm volatile("mov %0,x8" : "=r" (r8));
sret = reinterpret_cast<__sanitizer_struct_mallinfo*>(r8);
#endif
REAL(memset)(sret, 0, sizeof(*sret));
__msan_unpoison(sret, sizeof(*sret));
}
#define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
#else
#define MSAN_MAYBE_INTERCEPT_MALLINFO
#endif
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int, mallopt, int cmd, int value) {
return 0;
}
#define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
#else
#define MSAN_MAYBE_INTERCEPT_MALLOPT
#endif
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void, malloc_stats, void) {
// FIXME: implement, but don't call REAL(malloc_stats)!
}
#define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
#else
#define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
#endif
INTERCEPTOR(char *, strcpy, char *dest, const char *src) {
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
SIZE_T n = REAL(strlen)(src);
CHECK_UNPOISONED_STRING(src + n, 0);
char *res = REAL(strcpy)(dest, src);
CopyShadowAndOrigin(dest, src, n + 1, &stack);
return res;
}
INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) {
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
SIZE_T copy_size = REAL(strnlen)(src, n);
if (copy_size < n)
copy_size++; // trailing \0
char *res = REAL(strncpy)(dest, src, n);
CopyShadowAndOrigin(dest, src, copy_size, &stack);
__msan_unpoison(dest + copy_size, n - copy_size);
return res;
}
#if !SANITIZER_NETBSD
INTERCEPTOR(char *, stpcpy, char *dest, const char *src) {
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
SIZE_T n = REAL(strlen)(src);
CHECK_UNPOISONED_STRING(src + n, 0);
char *res = REAL(stpcpy)(dest, src);
CopyShadowAndOrigin(dest, src, n + 1, &stack);
return res;
}
#define MSAN_MAYBE_INTERCEPT_STPCPY INTERCEPT_FUNCTION(stpcpy)
#else
#define MSAN_MAYBE_INTERCEPT_STPCPY
#endif
INTERCEPTOR(char *, strdup, char *src) {
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
// On FreeBSD strdup() leverages strlen().
InterceptorScope interceptor_scope;
SIZE_T n = REAL(strlen)(src);
CHECK_UNPOISONED_STRING(src + n, 0);
char *res = REAL(strdup)(src);
CopyShadowAndOrigin(res, src, n + 1, &stack);
return res;
}
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(char *, __strdup, char *src) {
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
SIZE_T n = REAL(strlen)(src);
CHECK_UNPOISONED_STRING(src + n, 0);
char *res = REAL(__strdup)(src);
CopyShadowAndOrigin(res, src, n + 1, &stack);
return res;
}
#define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
#else
#define MSAN_MAYBE_INTERCEPT___STRDUP
#endif
#if !SANITIZER_NETBSD
INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
ENSURE_MSAN_INITED();
char *res = REAL(gcvt)(number, ndigit, buf);
SIZE_T n = REAL(strlen)(buf);
__msan_unpoison(buf, n + 1);
return res;
}
#define MSAN_MAYBE_INTERCEPT_GCVT INTERCEPT_FUNCTION(gcvt)
#else
#define MSAN_MAYBE_INTERCEPT_GCVT
#endif
INTERCEPTOR(char *, strcat, char *dest, const char *src) {
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
SIZE_T src_size = REAL(strlen)(src);
SIZE_T dest_size = REAL(strlen)(dest);
CHECK_UNPOISONED_STRING(src + src_size, 0);
CHECK_UNPOISONED_STRING(dest + dest_size, 0);
char *res = REAL(strcat)(dest, src);
CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
return res;
}
INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) {
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
SIZE_T dest_size = REAL(strlen)(dest);
SIZE_T copy_size = REAL(strnlen)(src, n);
CHECK_UNPOISONED_STRING(dest + dest_size, 0);
char *res = REAL(strncat)(dest, src, n);
CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
__msan_unpoison(dest + dest_size + copy_size, 1); // \0
return res;
}
// Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to
// deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO.
#define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \
ENSURE_MSAN_INITED(); \
ret_type res = REAL(func)(__VA_ARGS__); \
__msan_unpoison(endptr, sizeof(*endptr)); \
return res;
#define INTERCEPTOR_STRTO(ret_type, func, char_type) \
INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \
INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \
}
#define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
int base) { \
INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \
}
#define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \
INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
void *loc) { \
INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \
}
#define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \
INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
int base, void *loc) { \
INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \
}
#if SANITIZER_NETBSD
#define INTERCEPTORS_STRTO(ret_type, func, char_type) \
INTERCEPTOR_STRTO(ret_type, func, char_type) \
INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type)
#define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type)
#else
#define INTERCEPTORS_STRTO(ret_type, func, char_type) \
INTERCEPTOR_STRTO(ret_type, func, char_type) \
INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \
INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \
INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type)
#define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
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)
#endif
INTERCEPTORS_STRTO(double, strtod, char)
INTERCEPTORS_STRTO(float, strtof, char)
INTERCEPTORS_STRTO(long double, strtold, char)
INTERCEPTORS_STRTO_BASE(long, strtol, char)
INTERCEPTORS_STRTO_BASE(long long, strtoll, char)
INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char)
INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char)
INTERCEPTORS_STRTO_BASE(u64, strtouq, char)
INTERCEPTORS_STRTO(double, wcstod, wchar_t)
INTERCEPTORS_STRTO(float, wcstof, wchar_t)
INTERCEPTORS_STRTO(long double, wcstold, wchar_t)
INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t)
INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t)
INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t)
INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t)
#if SANITIZER_NETBSD
#define INTERCEPT_STRTO(func) \
INTERCEPT_FUNCTION(func); \
INTERCEPT_FUNCTION(func##_l);
#else
#define INTERCEPT_STRTO(func) \
INTERCEPT_FUNCTION(func); \
INTERCEPT_FUNCTION(func##_l); \
INTERCEPT_FUNCTION(__##func##_l); \
INTERCEPT_FUNCTION(__##func##_internal);
#endif
// 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;
}
#define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
ENSURE_MSAN_INITED(); \
InterceptorScope interceptor_scope; \
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 && !SANITIZER_NETBSD
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 && !SANITIZER_NETBSD
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(SIZE_T, 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;
}
// 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;
}
#if !SANITIZER_NETBSD
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;
}
#define MSAN_MAYBE_INTERCEPT_WMEMPCPY INTERCEPT_FUNCTION(wmempcpy)
#else
#define MSAN_MAYBE_INTERCEPT_WMEMPCPY
#endif
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;
}
#if !SANITIZER_NETBSD
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;
}
#define MSAN_MAYBE_INTERCEPT_FCVT INTERCEPT_FUNCTION(fcvt)
#else
#define MSAN_MAYBE_INTERCEPT_FCVT
#endif
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 || SANITIZER_NETBSD
INTERCEPTOR(int, fstat, int fd, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(fstat)(fd, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_stat_sz);
return res;
}
#define MSAN_MAYBE_INTERCEPT_FSTAT INTERCEPT_FUNCTION(fstat)
#else
#define MSAN_MAYBE_INTERCEPT_FSTAT
#endif
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
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 && !SANITIZER_NETBSD
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 || SANITIZER_NETBSD
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 && !SANITIZER_NETBSD
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;
}
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
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
#define INTERCEPTOR_GETRLIMIT_BODY(func, resource, rlim) \
if (msan_init_is_running) \
return REAL(getrlimit)(resource, rlim); \
ENSURE_MSAN_INITED(); \
int res = REAL(func)(resource, rlim); \
if (!res) \
__msan_unpoison(rlim, __sanitizer::struct_rlimit_sz); \
return res
INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
INTERCEPTOR_GETRLIMIT_BODY(getrlimit, resource, rlim);
}
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int, __getrlimit, int resource, void *rlim) {
INTERCEPTOR_GETRLIMIT_BODY(__getrlimit, resource, rlim);
}
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___GETRLIMIT INTERCEPT_FUNCTION(__getrlimit)
#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___GETRLIMIT
#define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
#define MSAN_MAYBE_INTERCEPT_PRLIMIT
#define MSAN_MAYBE_INTERCEPT_PRLIMIT64
#endif
INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
ENSURE_MSAN_INITED();
int res = REAL(gethostname)(name, len);
if (!res || (res == -1 && errno == errno_ENAMETOOLONG)) {
SIZE_T real_len = REAL(strnlen)(name, len);
if (real_len < len)
++real_len;
__msan_unpoison(name, real_len);
}
return res;
}
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
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 && !SANITIZER_NETBSD
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.
return AllocateFromLocalPool(nmemb * size);
return msan_calloc(nmemb, size, &stack);
}
INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
void *new_ptr;
if (UNLIKELY(!msan_inited)) {
new_ptr = AllocateFromLocalPool(copy_size);
} else {
copy_size = size;
new_ptr = msan_malloc(copy_size, &stack);
}
internal_memcpy(new_ptr, ptr, copy_size);
return new_ptr;
}
return msan_realloc(ptr, size, &stack);
}
INTERCEPTOR(void *, reallocarray, void *ptr, SIZE_T nmemb, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
return msan_reallocarray(ptr, nmemb, size, &stack);
}
INTERCEPTOR(void *, malloc, SIZE_T size) {
GET_MALLOC_STACK_TRACE;
if (UNLIKELY(!msan_inited))
// Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
return AllocateFromLocalPool(size);
return msan_malloc(size, &stack);
}
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);
}
}
template <class Mmap>
static void *mmap_interceptor(Mmap real_mmap, void *addr, SIZE_T length,
int prot, int flags, int fd, OFF64_T offset) {
SIZE_T rounded_length = RoundUpTo(length, GetPageSize());
void *end_addr = (char *)addr + (rounded_length - 1);
if (addr && (!MEM_IS_APP(addr) || !MEM_IS_APP(end_addr))) {
if (flags & map_fixed) {
errno = errno_EINVAL;
return (void *)-1;
} else {
addr = nullptr;
}
}
void *res = real_mmap(addr, length, prot, flags, fd, offset);
if (res != (void *)-1) {
void *end_res = (char *)res + (rounded_length - 1);
if (MEM_IS_APP(res) && MEM_IS_APP(end_res)) {
__msan_unpoison(res, rounded_length);
} else {
// Application has attempted to map more memory than is supported by
// MSAN. Act as if we ran out of memory.
internal_munmap(res, length);
errno = errno_ENOMEM;
return (void *)-1;
}
}
return res;
}
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);
}
static void read_sigaction(const __sanitizer_sigaction *act) {
CHECK_UNPOISONED(&act->sa_flags, sizeof(act->sa_flags));
if (act->sa_flags & __sanitizer::sa_siginfo)
CHECK_UNPOISONED(&act->sigaction, sizeof(act->sigaction));
else
CHECK_UNPOISONED(&act->handler, sizeof(act->handler));
CHECK_UNPOISONED(&act->sa_mask, sizeof(act->sa_mask));
}
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;
}
#if SANITIZER_NETBSD
INTERCEPTOR(int, __libc_thr_keycreate, __sanitizer_pthread_key_t *m,
void (*dtor)(void *value))
ALIAS(WRAPPER_NAME(pthread_key_create));
#endif
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();
InterceptorScope interceptor_scope;
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;
};
struct InterceptorContext {
BlockingMutex atexit_mu;
Vector<struct MSanAtExitRecord *> AtExitStack;
InterceptorContext()
: AtExitStack() {
}
};
static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)];
InterceptorContext *interceptor_ctx() {
return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
}
void MSanAtExitWrapper() {
MSanAtExitRecord *r;
{
BlockingMutexLock l(&interceptor_ctx()->atexit_mu);
uptr element = interceptor_ctx()->AtExitStack.Size() - 1;
r = interceptor_ctx()->AtExitStack[element];
interceptor_ctx()->AtExitStack.PopBack();
}
UnpoisonParam(1);
((void(*)())r->func)();
InternalFree(r);
}
void MSanCxaAtExitWrapper(void *arg) {
UnpoisonParam(1);
MSanAtExitRecord *r = (MSanAtExitRecord *)arg;
// libc before 2.27 had race which caused occasional double handler execution
// https://sourceware.org/ml/libc-alpha/2017-08/msg01204.html
if (!r->func)
return;
r->func(r->arg);
r->func = nullptr;
}
static int setup_at_exit_wrapper(void(*f)(), void *arg, void *dso);
// 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);
return setup_at_exit_wrapper((void(*)())func, arg, dso_handle);
}
// Unpoison argument shadow for C++ module destructors.
INTERCEPTOR(int, atexit, void (*func)()) {
// Avoid calling real atexit as it is unrechable on at least on Linux.
if (msan_init_is_running)
return REAL(__cxa_atexit)((void (*)(void *a))func, 0, 0);
return setup_at_exit_wrapper((void(*)())func, 0, 0);
}
static int setup_at_exit_wrapper(void(*f)(), void *arg, void *dso) {
ENSURE_MSAN_INITED();
MSanAtExitRecord *r =
(MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord));
r->func = (void(*)(void *a))f;
r->arg = arg;
int res;
if (!dso) {
// NetBSD does not preserve the 2nd argument if dso is equal to 0
// Store ctx in a local stack-like structure
BlockingMutexLock l(&interceptor_ctx()->atexit_mu);
res = REAL(__cxa_atexit)((void (*)(void *a))MSanAtExitWrapper, 0, 0);
if (!res) {
interceptor_ctx()->AtExitStack.PushBack(r);
}
} else {
res = REAL(__cxa_atexit)(MSanCxaAtExitWrapper, r, dso);
}
return res;
}
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;
}
// NetBSD ships with openpty(3) in -lutil, that needs to be prebuilt explicitly
// with MSan.
#if SANITIZER_LINUX
INTERCEPTOR(int, openpty, int *aparent, int *aworker, char *name,
const void *termp, const void *winp) {
ENSURE_MSAN_INITED();
InterceptorScope interceptor_scope;
int res = REAL(openpty)(aparent, aworker, name, termp, winp);
if (!res) {
__msan_unpoison(aparent, sizeof(*aparent));
__msan_unpoison(aworker, sizeof(*aworker));
}
return res;
}
#define MSAN_MAYBE_INTERCEPT_OPENPTY INTERCEPT_FUNCTION(openpty)
#else
#define MSAN_MAYBE_INTERCEPT_OPENPTY
#endif
// NetBSD ships with forkpty(3) in -lutil, that needs to be prebuilt explicitly
// with MSan.
#if SANITIZER_LINUX
INTERCEPTOR(int, forkpty, int *aparent, char *name, const void *termp,
const void *winp) {
ENSURE_MSAN_INITED();
InterceptorScope interceptor_scope;
int res = REAL(forkpty)(aparent, name, termp, winp);
if (res != -1)
__msan_unpoison(aparent, sizeof(*aparent));
return res;
}
#define MSAN_MAYBE_INTERCEPT_FORKPTY INTERCEPT_FUNCTION(forkpty)
#else
#define MSAN_MAYBE_INTERCEPT_FORKPTY
#endif
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)) \
VReport(1, "MemorySanitizer: failed to intercept '%s'\n", #name); \
} while (0)
#define MSAN_INTERCEPT_FUNC_VER(name, ver) \
do { \
if (!INTERCEPT_FUNCTION_VER(name, ver)) \
VReport(1, "MemorySanitizer: failed to intercept '%s@@%s'\n", #name, \
#ver); \
} while (0)
#define MSAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(name, ver) \
do { \
if (!INTERCEPT_FUNCTION_VER(name, ver) && !INTERCEPT_FUNCTION(name)) \
VReport(1, "MemorySanitizer: failed to intercept '%s@@%s' or '%s'\n", \
#name, #ver, #name); \
} 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_INTERCEPT_FUNCTION_VER_UNVERSIONED_FALLBACK(name, ver) \
MSAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(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_NOTHING_IS_INITIALIZED (!msan_inited)
#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
if (MsanThread *t = GetCurrentThread()) { \
*begin = t->tls_begin(); \
*end = t->tls_end(); \
} else { \
*begin = *end = 0; \
}
#define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
{ \
(void)ctx; \
return __msan_memset(block, c, size); \
}
#define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
{ \
(void)ctx; \
return __msan_memmove(to, from, size); \
}
#define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
{ \
(void)ctx; \
return __msan_memcpy(to, from, size); \
}
#define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size) \
do { \
GET_STORE_STACK_TRACE; \
CopyShadowAndOrigin(to, from, size, &stack); \
__msan_unpoison(to + size, 1); \
} while (false)
#define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, length, prot, flags, fd, \
offset) \
do { \
return mmap_interceptor(REAL(mmap), addr, sz, prot, flags, fd, off); \
} while (false)
#include "sanitizer_common/sanitizer_platform_interceptors.h"
#include "sanitizer_common/sanitizer_common_interceptors.inc"
static uptr signal_impl(int signo, uptr cb);
static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
__sanitizer_sigaction *oldact);
#define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
{ return sigaction_impl(signo, act, oldact); }
#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
{ \
handler = signal_impl(signo, handler); \
InterceptorScope interceptor_scope; \
return REAL(func)(signo, handler); \
}
#include "sanitizer_common/sanitizer_signal_interceptors.inc"
static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
__sanitizer_sigaction *oldact) {
ENSURE_MSAN_INITED();
if (act) read_sigaction(act);
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 = (decltype(pnew_act->sigaction))new_cb;
}
}
res = REAL(SIGACTION_SYMNAME)(signo, pnew_act, oldact);
if (res == 0 && oldact) {
uptr cb = (uptr)oldact->sigaction;
if (cb == (uptr)SignalAction || cb == (uptr)SignalHandler) {
oldact->sigaction = (decltype(oldact->sigaction))old_cb;
}
}
} else {
res = REAL(SIGACTION_SYMNAME)(signo, act, oldact);
}
if (res == 0 && oldact) {
__msan_unpoison(oldact, sizeof(__sanitizer_sigaction));
}
return res;
}
static uptr signal_impl(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 cb;
}
#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
do { \
} while (false)
#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
do { \
} while (false)
#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
#include "sanitizer_common/sanitizer_common_syscalls.inc"
#include "sanitizer_common/sanitizer_syscalls_netbsd.inc"
struct dlinfo {
char *dli_fname;
void *dli_fbase;
char *dli_sname;
void *dli_saddr;
};
INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
void *ctx;
COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
int res = REAL(dladdr)(addr, info);
if (res != 0) {
__msan_unpoison(info, sizeof(*info));
if (info->dli_fname)
__msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1);
if (info->dli_sname)
__msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1);
}
return res;
}
INTERCEPTOR(char *, dlerror, int fake) {
void *ctx;
COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
char *res = REAL(dlerror)(fake);
if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
return res;
}
typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
void *data);
struct dl_iterate_phdr_data {
dl_iterate_phdr_cb callback;
void *data;
};
static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
void *data) {
if (info) {
__msan_unpoison(info, size);
if (info->dlpi_phdr && info->dlpi_phnum)
__msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
if (info->dlpi_name)
__msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1);
}
dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
UnpoisonParam(3);
return cbdata->callback(info, size, cbdata->data);
}
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;
}
INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
void *ctx;
COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data);
dl_iterate_phdr_data cbdata;
cbdata.callback = callback;
cbdata.data = data;
int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
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;
}
INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
SIZE_T copy_size = REAL(wcsnlen)(src, n);
if (copy_size < n) copy_size++; // trailing \0
wchar_t *res = REAL(wcsncpy)(dest, src, n);
CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack);
__msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t));
return res;
}
// These interface functions reside here so that they can use
// REAL(memset), etc.
void __msan_unpoison(const void *a, uptr size) {
if (!MEM_IS_APP(a)) return;
SetShadow(a, size, 0);
}
void __msan_poison(const void *a, uptr size) {
if (!MEM_IS_APP(a)) return;
SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
}
void __msan_poison_stack(void *a, uptr size) {
if (!MEM_IS_APP(a)) return;
SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
}
void __msan_unpoison_param(uptr n) { UnpoisonParam(n); }
void __msan_clear_and_unpoison(void *a, uptr size) {
REAL(memset)(a, 0, size);
SetShadow(a, size, 0);
}
void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
if (!msan_inited) return internal_memcpy(dest, src, n);
if (msan_init_is_running || __msan::IsInSymbolizer())
return REAL(memcpy)(dest, src, n);
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
void *res = REAL(memcpy)(dest, src, n);
CopyShadowAndOrigin(dest, src, n, &stack);
return res;
}
void *__msan_memset(void *s, int c, SIZE_T n) {
if (!msan_inited) return internal_memset(s, c, n);
if (msan_init_is_running) return REAL(memset)(s, c, n);
ENSURE_MSAN_INITED();
void *res = REAL(memset)(s, c, n);
__msan_unpoison(s, n);
return res;
}
void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
if (!msan_inited) return internal_memmove(dest, src, n);
if (msan_init_is_running) return REAL(memmove)(dest, src, n);
ENSURE_MSAN_INITED();
GET_STORE_STACK_TRACE;
void *res = REAL(memmove)(dest, src, n);
MoveShadowAndOrigin(dest, src, n, &stack);
return res;
}
void __msan_unpoison_string(const char* s) {
if (!MEM_IS_APP(s)) return;
__msan_unpoison(s, REAL(strlen)(s) + 1);
}
namespace __msan {
void InitializeInterceptors() {
static int inited = 0;
CHECK_EQ(inited, 0);
new(interceptor_ctx()) InterceptorContext();
InitializeCommonInterceptors();
InitializeSignalInterceptors();
INTERCEPT_FUNCTION(posix_memalign);
MSAN_MAYBE_INTERCEPT_MEMALIGN;
MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN;
INTERCEPT_FUNCTION(valloc);
MSAN_MAYBE_INTERCEPT_PVALLOC;
INTERCEPT_FUNCTION(malloc);
INTERCEPT_FUNCTION(calloc);
INTERCEPT_FUNCTION(realloc);
INTERCEPT_FUNCTION(reallocarray);
INTERCEPT_FUNCTION(free);
MSAN_MAYBE_INTERCEPT_CFREE;
MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE;
MSAN_MAYBE_INTERCEPT_MALLINFO;
MSAN_MAYBE_INTERCEPT_MALLOPT;
MSAN_MAYBE_INTERCEPT_MALLOC_STATS;
INTERCEPT_FUNCTION(fread);
MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
INTERCEPT_FUNCTION(memccpy);
MSAN_MAYBE_INTERCEPT_MEMPCPY;
INTERCEPT_FUNCTION(bcopy);
INTERCEPT_FUNCTION(wmemset);
INTERCEPT_FUNCTION(wmemcpy);
MSAN_MAYBE_INTERCEPT_WMEMPCPY;
INTERCEPT_FUNCTION(wmemmove);
INTERCEPT_FUNCTION(strcpy);
MSAN_MAYBE_INTERCEPT_STPCPY;
INTERCEPT_FUNCTION(strdup);
MSAN_MAYBE_INTERCEPT___STRDUP;
INTERCEPT_FUNCTION(strncpy);
MSAN_MAYBE_INTERCEPT_GCVT;
INTERCEPT_FUNCTION(strcat);
INTERCEPT_FUNCTION(strncat);
INTERCEPT_STRTO(strtod);
INTERCEPT_STRTO(strtof);
INTERCEPT_STRTO(strtold);
INTERCEPT_STRTO(strtol);
INTERCEPT_STRTO(strtoul);
INTERCEPT_STRTO(strtoll);
INTERCEPT_STRTO(strtoull);
INTERCEPT_STRTO(strtouq);
INTERCEPT_STRTO(wcstod);
INTERCEPT_STRTO(wcstof);
INTERCEPT_STRTO(wcstold);
INTERCEPT_STRTO(wcstol);
INTERCEPT_STRTO(wcstoul);
INTERCEPT_STRTO(wcstoll);
INTERCEPT_STRTO(wcstoull);
#ifdef SANITIZER_NLDBL_VERSION
INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION);
INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION);
#else
INTERCEPT_FUNCTION(vswprintf);
INTERCEPT_FUNCTION(swprintf);
#endif
INTERCEPT_FUNCTION(strftime);
INTERCEPT_FUNCTION(strftime_l);
MSAN_MAYBE_INTERCEPT___STRFTIME_L;
INTERCEPT_FUNCTION(wcsftime);
INTERCEPT_FUNCTION(wcsftime_l);
MSAN_MAYBE_INTERCEPT___WCSFTIME_L;
INTERCEPT_FUNCTION(mbtowc);
INTERCEPT_FUNCTION(mbrtowc);
INTERCEPT_FUNCTION(wcslen);
INTERCEPT_FUNCTION(wcsnlen);
INTERCEPT_FUNCTION(wcschr);
INTERCEPT_FUNCTION(wcscpy);
INTERCEPT_FUNCTION(wcsncpy);
INTERCEPT_FUNCTION(wcscmp);
INTERCEPT_FUNCTION(getenv);
INTERCEPT_FUNCTION(setenv);
INTERCEPT_FUNCTION(putenv);
INTERCEPT_FUNCTION(gettimeofday);
MSAN_MAYBE_INTERCEPT_FCVT;
MSAN_MAYBE_INTERCEPT_FSTAT;
MSAN_MAYBE_INTERCEPT___FXSTAT;
MSAN_INTERCEPT_FSTATAT;
MSAN_MAYBE_INTERCEPT___FXSTAT64;
MSAN_MAYBE_INTERCEPT___FXSTATAT64;
INTERCEPT_FUNCTION(pipe);
INTERCEPT_FUNCTION(pipe2);
INTERCEPT_FUNCTION(socketpair);
MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
INTERCEPT_FUNCTION(getrlimit);
MSAN_MAYBE_INTERCEPT___GETRLIMIT;
MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
MSAN_MAYBE_INTERCEPT_PRLIMIT;
MSAN_MAYBE_INTERCEPT_PRLIMIT64;
INTERCEPT_FUNCTION(gethostname);
MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
INTERCEPT_FUNCTION(dladdr);
INTERCEPT_FUNCTION(dlerror);
INTERCEPT_FUNCTION(dl_iterate_phdr);
INTERCEPT_FUNCTION(getrusage);
#if defined(__mips__)
INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2");
#else
INTERCEPT_FUNCTION(pthread_create);
#endif
INTERCEPT_FUNCTION(pthread_key_create);
#if SANITIZER_NETBSD
INTERCEPT_FUNCTION(__libc_thr_keycreate);
#endif
INTERCEPT_FUNCTION(pthread_join);
INTERCEPT_FUNCTION(tzset);
INTERCEPT_FUNCTION(atexit);
INTERCEPT_FUNCTION(__cxa_atexit);
INTERCEPT_FUNCTION(shmat);
INTERCEPT_FUNCTION(fork);
MSAN_MAYBE_INTERCEPT_OPENPTY;
MSAN_MAYBE_INTERCEPT_FORKPTY;
inited = 1;
}
} // namespace __msan
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