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

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//===-- msan_interceptors.cc ----------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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 "sanitizer_common/sanitizer_platform_limits_posix.h"
#include "sanitizer_common/sanitizer_allocator.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_stackdepot.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_linux.h"
#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;
// True if this is a nested interceptor.
static THREADLOCAL int in_interceptor_scope;
struct InterceptorScope {
InterceptorScope() { ++in_interceptor_scope; }
~InterceptorScope() { --in_interceptor_scope; }
};
bool IsInInterceptorScope() {
return in_interceptor_scope;
}
#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; \
Printf("UMR in %s at offset %d inside [%p, +%d) \n", __FUNCTION__, \
offset, x, n); \
__msan::PrintWarningWithOrigin(pc, bp, \
__msan_get_origin((char *)x + offset)); \
if (!__msan::flags()->keep_going) { \
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);
static void *fast_memset(void *ptr, int c, SIZE_T n);
static void *fast_memcpy(void *dst, const void *src, SIZE_T n);
INTERCEPTOR(SIZE_T, fread, void *ptr, SIZE_T size, SIZE_T nmemb, void *file) {
ENSURE_MSAN_INITED();
SIZE_T res = REAL(fread)(ptr, size, nmemb, file);
if (res > 0)
__msan_unpoison(ptr, res *size);
return res;
}
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;
}
INTERCEPTOR(SSIZE_T, readlink, const char *path, char *buf, SIZE_T bufsiz) {
ENSURE_MSAN_INITED();
SSIZE_T res = REAL(readlink)(path, buf, bufsiz);
if (res > 0)
__msan_unpoison(buf, res);
return res;
}
INTERCEPTOR(void *, memcpy, void *dest, const void *src, SIZE_T n) {
return __msan_memcpy(dest, src, n);
}
INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
return (char *)__msan_memcpy(dest, src, n) + n;
}
INTERCEPTOR(void *, memmove, void *dest, const void *src, SIZE_T n) {
return __msan_memmove(dest, src, n);
}
INTERCEPTOR(void *, memset, void *s, int c, SIZE_T n) {
return __msan_memset(s, c, n);
}
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_EQ(alignment & (alignment - 1), 0);
CHECK_NE(memptr, 0);
*memptr = MsanReallocate(&stack, 0, size, alignment, false);
CHECK_NE(*memptr, 0);
__msan_unpoison(memptr, sizeof(*memptr));
return 0;
}
INTERCEPTOR(void, free, void *ptr) {
ENSURE_MSAN_INITED();
if (ptr == 0) return;
MsanDeallocate(ptr);
}
INTERCEPTOR(SIZE_T, strlen, const char *s) {
ENSURE_MSAN_INITED();
SIZE_T res = REAL(strlen)(s);
CHECK_UNPOISONED(s, res + 1);
return res;
}
INTERCEPTOR(SIZE_T, strnlen, const char *s, SIZE_T n) {
ENSURE_MSAN_INITED();
SIZE_T res = REAL(strnlen)(s, n);
SIZE_T scan_size = (res == n) ? res : res + 1;
CHECK_UNPOISONED(s, scan_size);
return res;
}
// FIXME: Add stricter shadow checks in str* interceptors (ex.: strcpy should
// check the shadow of the terminating \0 byte).
INTERCEPTOR(char *, strcpy, char *dest, const char *src) { // NOLINT
ENSURE_MSAN_INITED();
SIZE_T n = REAL(strlen)(src);
char *res = REAL(strcpy)(dest, src); // NOLINT
__msan_copy_poison(dest, src, n + 1);
return res;
}
INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { // NOLINT
ENSURE_MSAN_INITED();
SIZE_T copy_size = REAL(strnlen)(src, n);
if (copy_size < n)
copy_size++; // trailing \0
char *res = REAL(strncpy)(dest, src, n); // NOLINT
__msan_copy_poison(dest, src, copy_size);
return res;
}
INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { // NOLINT
ENSURE_MSAN_INITED();
SIZE_T n = REAL(strlen)(src);
char *res = REAL(stpcpy)(dest, src); // NOLINT
__msan_copy_poison(dest, src, n + 1);
return res;
}
INTERCEPTOR(char *, strdup, char *src) {
ENSURE_MSAN_INITED();
SIZE_T n = REAL(strlen)(src);
char *res = REAL(strdup)(src);
__msan_copy_poison(res, src, n + 1);
return res;
}
INTERCEPTOR(char *, __strdup, char *src) {
ENSURE_MSAN_INITED();
SIZE_T n = REAL(strlen)(src);
char *res = REAL(__strdup)(src);
__msan_copy_poison(res, src, n + 1);
return res;
}
INTERCEPTOR(char *, strndup, char *src, SIZE_T n) {
ENSURE_MSAN_INITED();
SIZE_T copy_size = REAL(strnlen)(src, n);
char *res = REAL(strndup)(src, n);
__msan_copy_poison(res, src, copy_size);
__msan_unpoison(res + copy_size, 1); // \0
return res;
}
INTERCEPTOR(char *, __strndup, char *src, SIZE_T n) {
ENSURE_MSAN_INITED();
SIZE_T copy_size = REAL(strnlen)(src, n);
char *res = REAL(__strndup)(src, n);
__msan_copy_poison(res, src, copy_size);
__msan_unpoison(res + copy_size, 1); // \0
return res;
}
INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
ENSURE_MSAN_INITED();
char *res = REAL(gcvt)(number, ndigit, buf);
// DynamoRio tool will take care of unpoisoning gcvt result for us.
if (!__msan_has_dynamic_component()) {
SIZE_T n = REAL(strlen)(buf);
__msan_unpoison(buf, n + 1);
}
return res;
}
INTERCEPTOR(char *, strcat, char *dest, const char *src) { // NOLINT
ENSURE_MSAN_INITED();
SIZE_T src_size = REAL(strlen)(src);
SIZE_T dest_size = REAL(strlen)(dest);
char *res = REAL(strcat)(dest, src); // NOLINT
__msan_copy_poison(dest + dest_size, src, src_size + 1);
return res;
}
INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { // NOLINT
ENSURE_MSAN_INITED();
SIZE_T dest_size = REAL(strlen)(dest);
SIZE_T copy_size = REAL(strlen)(src);
if (copy_size < n)
copy_size++; // trailing \0
char *res = REAL(strncat)(dest, src, n); // NOLINT
__msan_copy_poison(dest + dest_size, src, copy_size);
return res;
}
INTERCEPTOR(long, strtol, const char *nptr, char **endptr, // NOLINT
int base) {
ENSURE_MSAN_INITED();
long res = REAL(strtol)(nptr, endptr, base); // NOLINT
if (!__msan_has_dynamic_component()) {
__msan_unpoison(endptr, sizeof(*endptr));
}
return res;
}
INTERCEPTOR(long long, strtoll, const char *nptr, char **endptr, // NOLINT
int base) {
ENSURE_MSAN_INITED();
long res = REAL(strtoll)(nptr, endptr, base); //NOLINT
if (!__msan_has_dynamic_component()) {
__msan_unpoison(endptr, sizeof(*endptr));
}
return res;
}
INTERCEPTOR(unsigned long, strtoul, const char *nptr, char **endptr, // NOLINT
int base) {
ENSURE_MSAN_INITED();
unsigned long res = REAL(strtoul)(nptr, endptr, base); // NOLINT
if (!__msan_has_dynamic_component()) {
__msan_unpoison(endptr, sizeof(*endptr));
}
return res;
}
INTERCEPTOR(unsigned long long, strtoull, const char *nptr, // NOLINT
char **endptr, int base) {
ENSURE_MSAN_INITED();
unsigned long res = REAL(strtoull)(nptr, endptr, base); // NOLINT
if (!__msan_has_dynamic_component()) {
__msan_unpoison(endptr, sizeof(*endptr));
}
return res;
}
INTERCEPTOR(double, strtod, const char *nptr, char **endptr) { // NOLINT
ENSURE_MSAN_INITED();
double res = REAL(strtod)(nptr, endptr); // NOLINT
if (!__msan_has_dynamic_component()) {
__msan_unpoison(endptr, sizeof(*endptr));
}
return res;
}
INTERCEPTOR(float, strtof, const char *nptr, char **endptr) { // NOLINT
ENSURE_MSAN_INITED();
float res = REAL(strtof)(nptr, endptr); // NOLINT
if (!__msan_has_dynamic_component()) {
__msan_unpoison(endptr, sizeof(*endptr));
}
return res;
}
INTERCEPTOR(long double, strtold, const char *nptr, char **endptr) { // NOLINT
ENSURE_MSAN_INITED();
long double res = REAL(strtold)(nptr, endptr); // NOLINT
if (!__msan_has_dynamic_component()) {
__msan_unpoison(endptr, sizeof(*endptr));
}
return res;
}
INTERCEPTOR(int, vasprintf, char **strp, const char *format, va_list ap) {
ENSURE_MSAN_INITED();
int res = REAL(vasprintf)(strp, format, ap);
if (res >= 0 && !__msan_has_dynamic_component()) {
__msan_unpoison(strp, sizeof(*strp));
__msan_unpoison(*strp, res + 1);
}
return res;
}
INTERCEPTOR(int, asprintf, char **strp, const char *format, ...) { // NOLINT
ENSURE_MSAN_INITED();
va_list ap;
va_start(ap, format);
int res = vasprintf(strp, format, ap); // NOLINT
va_end(ap);
return res;
}
INTERCEPTOR(int, vsnprintf, char *str, uptr size,
const char *format, va_list ap) {
ENSURE_MSAN_INITED();
int res = REAL(vsnprintf)(str, size, format, ap);
if (res >= 0 && !__msan_has_dynamic_component()) {
__msan_unpoison(str, res + 1);
}
return res;
}
INTERCEPTOR(int, vsprintf, char *str, const char *format, va_list ap) {
ENSURE_MSAN_INITED();
int res = REAL(vsprintf)(str, format, ap);
if (res >= 0 && !__msan_has_dynamic_component()) {
__msan_unpoison(str, res + 1);
}
return res;
}
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_has_dynamic_component()) {
__msan_unpoison(str, 4 * (res + 1));
}
return res;
}
INTERCEPTOR(int, sprintf, char *str, const char *format, ...) { // NOLINT
ENSURE_MSAN_INITED();
va_list ap;
va_start(ap, format);
int res = vsprintf(str, format, ap); // NOLINT
va_end(ap);
return res;
}
INTERCEPTOR(int, snprintf, char *str, uptr size, const char *format, ...) {
ENSURE_MSAN_INITED();
va_list ap;
va_start(ap, format);
int res = vsnprintf(str, size, format, ap);
va_end(ap);
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;
}
// SIZE_T strftime(char *s, SIZE_T max, const char *format,const struct tm *tm);
INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
void *tm) {
ENSURE_MSAN_INITED();
SIZE_T res = REAL(strftime)(s, max, format, tm);
if (res) __msan_unpoison(s, res + 1);
return res;
}
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();
wchar_t *res = REAL(wcscpy)(dest, src);
__msan_copy_poison(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1));
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();
wchar_t *res = REAL(wmemcpy)(dest, src, n);
__msan_copy_poison(dest, src, n * sizeof(wchar_t));
return res;
}
INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
ENSURE_MSAN_INITED();
wchar_t *res = REAL(wmempcpy)(dest, src, n);
__msan_copy_poison(dest, src, n * sizeof(wchar_t));
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 = (wchar_t *)fast_memset(s, c, n * sizeof(wchar_t));
__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();
wchar_t *res = REAL(wmemmove)(dest, src, n);
__msan_move_poison(dest, src, n * sizeof(wchar_t));
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(double, wcstod, const wchar_t *nptr, wchar_t **endptr) {
ENSURE_MSAN_INITED();
double res = REAL(wcstod)(nptr, endptr);
__msan_unpoison(endptr, sizeof(*endptr));
return res;
}
// #define UNSUPPORTED(name) \
// INTERCEPTOR(void, name, void) { \
// Printf("MSAN: Unsupported %s\n", __FUNCTION__); \
// Die(); \
// }
// FIXME: intercept the following functions:
// Note, they only matter when running without a dynamic tool.
// UNSUPPORTED(wcscoll_l)
// UNSUPPORTED(wcsnrtombs)
// UNSUPPORTED(wcstol)
// UNSUPPORTED(wcstoll)
// UNSUPPORTED(wcstold)
// UNSUPPORTED(wcstoul)
// UNSUPPORTED(wcstoull)
// UNSUPPORTED(wcsxfrm_l)
// UNSUPPORTED(wcsdup)
// UNSUPPORTED(wcsftime)
// UNSUPPORTED(wcsstr)
// UNSUPPORTED(wcsrchr)
// UNSUPPORTED(wctob)
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);
if (!__msan_has_dynamic_component()) {
__msan_unpoison(b, sizeof(*b));
__msan_unpoison(c, sizeof(*c));
}
return res;
}
INTERCEPTOR(char *, getenv, char *name) {
ENSURE_MSAN_INITED();
char *res = REAL(getenv)(name);
if (!__msan_has_dynamic_component()) {
if (res)
__msan_unpoison(res, REAL(strlen)(res) + 1);
}
return res;
}
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;
}
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;
}
INTERCEPTOR(int, __xstat, int magic, char *path, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(__xstat)(magic, path, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_stat_sz);
return res;
}
INTERCEPTOR(int, __xstat64, int magic, char *path, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(__xstat64)(magic, path, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_stat64_sz);
return res;
}
INTERCEPTOR(int, __lxstat, int magic, char *path, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(__lxstat)(magic, path, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_stat_sz);
return res;
}
INTERCEPTOR(int, __lxstat64, int magic, char *path, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(__lxstat64)(magic, path, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_stat64_sz);
return res;
}
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;
}
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;
}
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;
}
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, statfs, const char *s, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(statfs)(s, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_statfs_sz);
return res;
}
INTERCEPTOR(int, fstatfs, int fd, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(fstatfs)(fd, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_statfs_sz);
return res;
}
INTERCEPTOR(int, statfs64, const char *s, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(statfs64)(s, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_statfs64_sz);
return res;
}
INTERCEPTOR(int, fstatfs64, int fd, void *buf) {
ENSURE_MSAN_INITED();
int res = REAL(fstatfs64)(fd, buf);
if (!res)
__msan_unpoison(buf, __sanitizer::struct_statfs64_sz);
return res;
}
INTERCEPTOR(int, uname, void *utsname) {
ENSURE_MSAN_INITED();
int res = REAL(uname)(utsname);
if (!res) {
__msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
}
return res;
}
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;
}
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;
}
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;
}
INTERCEPTOR(SSIZE_T, recv, int fd, void *buf, SIZE_T len, int flags) {
ENSURE_MSAN_INITED();
SSIZE_T res = REAL(recv)(fd, buf, len, flags);
if (res > 0)
__msan_unpoison(buf, res);
return res;
}
INTERCEPTOR(SSIZE_T, recvfrom, int fd, void *buf, SIZE_T len, int flags,
void *srcaddr, int *addrlen) {
ENSURE_MSAN_INITED();
SIZE_T srcaddr_sz;
if (srcaddr) srcaddr_sz = *addrlen;
SSIZE_T res = REAL(recvfrom)(fd, buf, len, flags, srcaddr, addrlen);
if (res > 0) {
__msan_unpoison(buf, res);
if (srcaddr) {
SIZE_T sz = *addrlen;
__msan_unpoison(srcaddr, (sz < srcaddr_sz) ? sz : srcaddr_sz);
}
}
return res;
}
INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
if (CallocShouldReturnNullDueToOverflow(size, nmemb)) return 0;
GET_MALLOC_STACK_TRACE;
if (!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 MsanReallocate(&stack, 0, nmemb * size, sizeof(u64), true);
}
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, 0, size, sizeof(u64), false);
}
void __msan_allocated_memory(const void* data, uptr size) {
GET_MALLOC_STACK_TRACE;
if (flags()->poison_in_malloc)
__msan_poison(data, size);
if (__msan_get_track_origins()) {
u32 stack_id = StackDepotPut(stack.trace, stack.size);
CHECK(stack_id);
CHECK_EQ((stack_id >> 31), 0); // Higher bit is occupied by stack origins.
__msan_set_origin(data, size, stack_id);
}
}
INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
int fd, OFF_T offset) {
ENSURE_MSAN_INITED();
void *res = REAL(mmap)(addr, length, prot, flags, fd, offset);
if (res != (void*)-1)
__msan_unpoison(res, RoundUpTo(length, GetPageSize()));
return res;
}
INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
int fd, OFF64_T offset) {
ENSURE_MSAN_INITED();
void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
if (res != (void*)-1)
__msan_unpoison(res, RoundUpTo(length, GetPageSize()));
return res;
}
struct dlinfo {
char *dli_fname;
void *dli_fbase;
char *dli_sname;
void *dli_saddr;
};
INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
ENSURE_MSAN_INITED();
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;
}
// dlopen() ultimately calls mmap() down inside the loader, which generally
// doesn't participate in dynamic symbol resolution. Therefore we won't
// intercept its calls to mmap, and we have to hook it here. The loader
// initializes the module before returning, so without the dynamic component, we
// won't be able to clear the shadow before the initializers. Fixing this would
// require putting our own initializer first to clear the shadow.
INTERCEPTOR(void *, dlopen, const char *filename, int flag) {
ENSURE_MSAN_INITED();
EnterLoader();
link_map *map = (link_map *)REAL(dlopen)(filename, flag);
ExitLoader();
if (!__msan_has_dynamic_component() && map) {
// If msandr didn't clear the shadow before the initializers ran, we do it
// ourselves afterwards.
UnpoisonMappedDSO(map);
}
return (void *)map;
}
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_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(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
ENSURE_MSAN_INITED();
EnterLoader();
dl_iterate_phdr_data cbdata;
cbdata.callback = callback;
cbdata.data = data;
int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
ExitLoader();
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;
}
const int kMaxSignals = 1024;
static uptr sigactions[kMaxSignals];
static StaticSpinMutex sigactions_mu;
static void SignalHandler(int signo) {
typedef void (*signal_cb)(int x);
signal_cb cb = (signal_cb)sigactions[signo];
cb(signo);
}
static void SignalAction(int signo, void *si, void *uc) {
UnpoisonParam(3);
__msan_unpoison(si, __sanitizer::struct_sigaction_sz);
__msan_unpoison(uc, __sanitizer::ucontext_t_sz);
typedef void (*sigaction_cb)(int, void *, void *);
sigaction_cb cb = (sigaction_cb)sigactions[signo];
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 = sigactions[signo];
__sanitizer_sigaction new_act;
__sanitizer_sigaction *pnew_act = act ? &new_act : 0;
if (act) {
internal_memcpy(pnew_act, act, __sanitizer::struct_sigaction_sz);
uptr cb = __sanitizer::__sanitizer_get_sigaction_sa_sigaction(pnew_act);
uptr new_cb =
__sanitizer::__sanitizer_get_sigaction_sa_siginfo(pnew_act) ?
(uptr)SignalAction : (uptr)SignalHandler;
if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
sigactions[signo] = cb;
__sanitizer::__sanitizer_set_sigaction_sa_sigaction(pnew_act, new_cb);
}
}
res = REAL(sigaction)(signo, pnew_act, oldact);
if (res == 0 && oldact) {
uptr cb = __sanitizer::__sanitizer_get_sigaction_sa_sigaction(oldact);
if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
__sanitizer::__sanitizer_set_sigaction_sa_sigaction(oldact, old_cb);
}
}
} else {
res = REAL(sigaction)(signo, act, oldact);
}
if (res == 0 && oldact) {
__msan_unpoison(oldact, __sanitizer::struct_sigaction_sz);
}
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) {
sigactions[signo] = cb;
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);
extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
extern "C" int pthread_attr_getstack(void *attr, uptr *stack, uptr *stacksize);
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 == 0) {
pthread_attr_init(&myattr);
attr = &myattr;
}
AdjustStackSizeLinux(attr, flags()->verbosity);
int res = REAL(pthread_create)(th, attr, callback, param);
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 *)) {
ENSURE_MSAN_INITED();
int res = REAL(pthread_key_create)(key, dtor);
if (!res && key)
__msan_unpoison(key, sizeof(*key));
return res;
}
struct MSanInterceptorContext {
bool in_interceptor_scope;
};
// A version of CHECK_UNPOISED 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 COMMON_INTERCEPTOR_UNPOISON_PARAM(ctx, 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_ENTER(ctx, func, ...) \
if (msan_init_is_running) return REAL(func)(__VA_ARGS__); \
MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \
ctx = (void *)&msan_ctx; \
InterceptorScope interceptor_scope; \
ENSURE_MSAN_INITED();
#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
#include "sanitizer_common/sanitizer_common_interceptors.inc"
#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s)
#define COMMON_SYSCALL_POST_READ_RANGE(p, s)
#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
#include "sanitizer_common/sanitizer_common_syscalls.inc"
// static
void *fast_memset(void *ptr, int c, SIZE_T n) {
// hack until we have a really fast internal_memset
if (sizeof(uptr) == 8 &&
(n % 8) == 0 &&
((uptr)ptr % 8) == 0 &&
(c == 0 || c == -1)) {
// Printf("memset %p %zd %x\n", ptr, n, c);
uptr to_store = c ? -1L : 0L;
uptr *p = (uptr*)ptr;
for (SIZE_T i = 0; i < n / 8; i++)
p[i] = to_store;
return ptr;
}
return internal_memset(ptr, c, n);
}
// static
void *fast_memcpy(void *dst, const void *src, SIZE_T n) {
// Same hack as in fast_memset above.
if (sizeof(uptr) == 8 &&
(n % 8) == 0 &&
((uptr)dst % 8) == 0 &&
((uptr)src % 8) == 0) {
uptr *d = (uptr*)dst;
uptr *s = (uptr*)src;
for (SIZE_T i = 0; i < n / 8; i++)
d[i] = s[i];
return dst;
}
return internal_memcpy(dst, src, n);
}
// These interface functions reside here so that they can use
// fast_memset, etc.
void __msan_unpoison(const void *a, uptr size) {
if (!MEM_IS_APP(a)) return;
fast_memset((void*)MEM_TO_SHADOW((uptr)a), 0, size);
}
void __msan_poison(const void *a, uptr size) {
if (!MEM_IS_APP(a)) return;
fast_memset((void*)MEM_TO_SHADOW((uptr)a),
__msan::flags()->poison_heap_with_zeroes ? 0 : -1, size);
}
void __msan_poison_stack(void *a, uptr size) {
if (!MEM_IS_APP(a)) return;
fast_memset((void*)MEM_TO_SHADOW((uptr)a),
__msan::flags()->poison_stack_with_zeroes ? 0 : -1, size);
}
void __msan_clear_and_unpoison(void *a, uptr size) {
fast_memset(a, 0, size);
fast_memset((void*)MEM_TO_SHADOW((uptr)a), 0, size);
}
void __msan_copy_origin(void *dst, const void *src, uptr size) {
if (!__msan_get_track_origins()) return;
if (!MEM_IS_APP(dst) || !MEM_IS_APP(src)) return;
uptr d = MEM_TO_ORIGIN(dst);
uptr s = MEM_TO_ORIGIN(src);
uptr beg = d & ~3UL; // align down.
uptr end = (d + size + 3) & ~3UL; // align up.
s = s & ~3UL; // align down.
fast_memcpy((void*)beg, (void*)s, end - beg);
}
void __msan_copy_poison(void *dst, const void *src, uptr size) {
if (!MEM_IS_APP(dst)) return;
if (!MEM_IS_APP(src)) return;
fast_memcpy((void*)MEM_TO_SHADOW((uptr)dst),
(void*)MEM_TO_SHADOW((uptr)src), size);
__msan_copy_origin(dst, src, size);
}
void __msan_move_poison(void *dst, const void *src, uptr size) {
if (!MEM_IS_APP(dst)) return;
if (!MEM_IS_APP(src)) return;
internal_memmove((void*)MEM_TO_SHADOW((uptr)dst),
(void*)MEM_TO_SHADOW((uptr)src), size);
__msan_copy_origin(dst, src, size);
}
void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
ENSURE_MSAN_INITED();
void *res = fast_memcpy(dest, src, n);
__msan_copy_poison(dest, src, n);
return res;
}
void *__msan_memset(void *s, int c, SIZE_T n) {
ENSURE_MSAN_INITED();
void *res = fast_memset(s, c, n);
__msan_unpoison(s, n);
return res;
}
void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
ENSURE_MSAN_INITED();
void *res = REAL(memmove)(dest, src, n);
__msan_move_poison(dest, src, n);
return res;
}
namespace __msan {
void InitializeInterceptors() {
static int inited = 0;
CHECK_EQ(inited, 0);
SANITIZER_COMMON_INTERCEPTORS_INIT;
INTERCEPT_FUNCTION(mmap);
INTERCEPT_FUNCTION(mmap64);
INTERCEPT_FUNCTION(posix_memalign);
INTERCEPT_FUNCTION(malloc);
INTERCEPT_FUNCTION(calloc);
INTERCEPT_FUNCTION(realloc);
INTERCEPT_FUNCTION(free);
INTERCEPT_FUNCTION(fread);
INTERCEPT_FUNCTION(fread_unlocked);
INTERCEPT_FUNCTION(readlink);
INTERCEPT_FUNCTION(memcpy);
INTERCEPT_FUNCTION(mempcpy);
INTERCEPT_FUNCTION(memset);
INTERCEPT_FUNCTION(memmove);
INTERCEPT_FUNCTION(bcopy);
INTERCEPT_FUNCTION(wmemset);
INTERCEPT_FUNCTION(wmemcpy);
INTERCEPT_FUNCTION(wmempcpy);
INTERCEPT_FUNCTION(wmemmove);
INTERCEPT_FUNCTION(strcpy); // NOLINT
INTERCEPT_FUNCTION(stpcpy); // NOLINT
INTERCEPT_FUNCTION(strdup);
INTERCEPT_FUNCTION(__strdup);
INTERCEPT_FUNCTION(strndup);
INTERCEPT_FUNCTION(__strndup);
INTERCEPT_FUNCTION(strncpy); // NOLINT
INTERCEPT_FUNCTION(strlen);
INTERCEPT_FUNCTION(strnlen);
INTERCEPT_FUNCTION(gcvt);
INTERCEPT_FUNCTION(strcat); // NOLINT
INTERCEPT_FUNCTION(strncat); // NOLINT
INTERCEPT_FUNCTION(strtol);
INTERCEPT_FUNCTION(strtoll);
INTERCEPT_FUNCTION(strtoul);
INTERCEPT_FUNCTION(strtoull);
INTERCEPT_FUNCTION(strtod);
INTERCEPT_FUNCTION(strtof);
INTERCEPT_FUNCTION(strtold);
INTERCEPT_FUNCTION(vasprintf);
INTERCEPT_FUNCTION(asprintf);
INTERCEPT_FUNCTION(vsprintf);
INTERCEPT_FUNCTION(vsnprintf);
INTERCEPT_FUNCTION(vswprintf);
INTERCEPT_FUNCTION(sprintf); // NOLINT
INTERCEPT_FUNCTION(snprintf);
INTERCEPT_FUNCTION(swprintf);
INTERCEPT_FUNCTION(strftime);
INTERCEPT_FUNCTION(mbtowc);
INTERCEPT_FUNCTION(mbrtowc);
INTERCEPT_FUNCTION(wcslen);
INTERCEPT_FUNCTION(wcschr);
INTERCEPT_FUNCTION(wcscpy);
INTERCEPT_FUNCTION(wcscmp);
INTERCEPT_FUNCTION(wcstod);
INTERCEPT_FUNCTION(getenv);
INTERCEPT_FUNCTION(gettimeofday);
INTERCEPT_FUNCTION(fcvt);
INTERCEPT_FUNCTION(__fxstat);
INTERCEPT_FUNCTION(__xstat);
INTERCEPT_FUNCTION(__lxstat);
INTERCEPT_FUNCTION(__fxstat64);
INTERCEPT_FUNCTION(__xstat64);
INTERCEPT_FUNCTION(__lxstat64);
INTERCEPT_FUNCTION(pipe);
INTERCEPT_FUNCTION(pipe2);
INTERCEPT_FUNCTION(socketpair);
INTERCEPT_FUNCTION(fgets);
INTERCEPT_FUNCTION(fgets_unlocked);
INTERCEPT_FUNCTION(getrlimit);
INTERCEPT_FUNCTION(getrlimit64);
INTERCEPT_FUNCTION(statfs);
INTERCEPT_FUNCTION(fstatfs);
INTERCEPT_FUNCTION(statfs64);
INTERCEPT_FUNCTION(fstatfs64);
INTERCEPT_FUNCTION(uname);
INTERCEPT_FUNCTION(gethostname);
INTERCEPT_FUNCTION(epoll_wait);
INTERCEPT_FUNCTION(epoll_pwait);
INTERCEPT_FUNCTION(recv);
INTERCEPT_FUNCTION(recvfrom);
INTERCEPT_FUNCTION(dladdr);
INTERCEPT_FUNCTION(dlopen);
INTERCEPT_FUNCTION(dl_iterate_phdr);
INTERCEPT_FUNCTION(getrusage);
INTERCEPT_FUNCTION(sigaction);
INTERCEPT_FUNCTION(signal);
INTERCEPT_FUNCTION(pthread_create);
INTERCEPT_FUNCTION(pthread_key_create);
inited = 1;
}
} // namespace __msan
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