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Diffstat (limited to 'contrib/compiler-rt/lib/msan/msan_interceptors.cc')
| -rw-r--r-- | contrib/compiler-rt/lib/msan/msan_interceptors.cc | 1575 |
1 files changed, 1575 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/msan/msan_interceptors.cc b/contrib/compiler-rt/lib/msan/msan_interceptors.cc new file mode 100644 index 000000000000..4a243941b8a3 --- /dev/null +++ b/contrib/compiler-rt/lib/msan/msan_interceptors.cc @@ -0,0 +1,1575 @@ +//===-- 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 "msan_chained_origin_depot.h" +#include "msan_origin.h" +#include "msan_thread.h" +#include "msan_poisoning.h" +#include "sanitizer_common/sanitizer_platform_limits_posix.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_stackdepot.h" +#include "sanitizer_common/sanitizer_libc.h" +#include "sanitizer_common/sanitizer_linux.h" +#include "sanitizer_common/sanitizer_tls_get_addr.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; + +using __sanitizer::memory_order; +using __sanitizer::atomic_load; +using __sanitizer::atomic_store; +using __sanitizer::atomic_uintptr_t; + +#if SANITIZER_FREEBSD +#define __errno_location __error +#endif + +// True if this is a nested interceptor. +static THREADLOCAL int in_interceptor_scope; + +extern "C" int *__errno_location(void); + +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; \ + 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); + +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; +} + +#if !SANITIZER_FREEBSD +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 + +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 *, 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 *, 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; +} + +#if !SANITIZER_FREEBSD +INTERCEPTOR(void *, memalign, SIZE_T boundary, SIZE_T size) { + GET_MALLOC_STACK_TRACE; + CHECK_EQ(boundary & (boundary - 1), 0); + void *ptr = MsanReallocate(&stack, 0, size, boundary, false); + return ptr; +} +#define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign) +#else +#define MSAN_MAYBE_INTERCEPT_MEMALIGN +#endif + +INTERCEPTOR(void *, aligned_alloc, SIZE_T boundary, SIZE_T size) { + GET_MALLOC_STACK_TRACE; + CHECK_EQ(boundary & (boundary - 1), 0); + void *ptr = MsanReallocate(&stack, 0, size, boundary, false); + return ptr; +} + +INTERCEPTOR(void *, __libc_memalign, SIZE_T boundary, SIZE_T size) { + GET_MALLOC_STACK_TRACE; + CHECK_EQ(boundary & (boundary - 1), 0); + void *ptr = MsanReallocate(&stack, 0, size, boundary, false); + DTLS_on_libc_memalign(ptr, size * boundary); + return ptr; +} + +INTERCEPTOR(void *, valloc, SIZE_T size) { + GET_MALLOC_STACK_TRACE; + void *ptr = MsanReallocate(&stack, 0, size, GetPageSizeCached(), false); + return ptr; +} + +#if !SANITIZER_FREEBSD +INTERCEPTOR(void *, pvalloc, SIZE_T size) { + GET_MALLOC_STACK_TRACE; + uptr PageSize = GetPageSizeCached(); + size = RoundUpTo(size, PageSize); + if (size == 0) { + // pvalloc(0) should allocate one page. + size = PageSize; + } + void *ptr = MsanReallocate(&stack, 0, size, PageSize, false); + return ptr; +} +#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 == 0) return; + MsanDeallocate(&stack, ptr); +} + +#if !SANITIZER_FREEBSD +INTERCEPTOR(void, cfree, void *ptr) { + GET_MALLOC_STACK_TRACE; + if (ptr == 0) return; + MsanDeallocate(&stack, ptr); +} +#define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree) +#else +#define MSAN_MAYBE_INTERCEPT_CFREE +#endif + +INTERCEPTOR(uptr, malloc_usable_size, void *ptr) { + return __sanitizer_get_allocated_size(ptr); +} + +#if !SANITIZER_FREEBSD +// This function actually returns a struct by value, but we can't unpoison a +// temporary! The following is equivalent on all supported platforms, and we +// have a test to confirm that. +INTERCEPTOR(void, mallinfo, __sanitizer_mallinfo *sret) { + 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 +INTERCEPTOR(int, mallopt, int cmd, int value) { + return -1; +} +#define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt) +#else +#define MSAN_MAYBE_INTERCEPT_MALLOPT +#endif + +#if !SANITIZER_FREEBSD +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(SIZE_T, strlen, const char *s) { + if (msan_init_is_running) + return REAL(strlen)(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(); + GET_STORE_STACK_TRACE; + SIZE_T n = REAL(strlen)(src); + char *res = REAL(strcpy)(dest, src); // NOLINT + CopyShadowAndOrigin(dest, src, n + 1, &stack); + return res; +} + +INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { // NOLINT + 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); // NOLINT + CopyShadowAndOrigin(dest, src, copy_size, &stack); + __msan_unpoison(dest + copy_size, n - copy_size); + return res; +} + +INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { // NOLINT + ENSURE_MSAN_INITED(); + GET_STORE_STACK_TRACE; + SIZE_T n = REAL(strlen)(src); + char *res = REAL(stpcpy)(dest, src); // NOLINT + CopyShadowAndOrigin(dest, src, n + 1, &stack); + return res; +} + +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); + char *res = REAL(strdup)(src); + CopyShadowAndOrigin(res, src, n + 1, &stack); + return res; +} + +#if !SANITIZER_FREEBSD +INTERCEPTOR(char *, __strdup, char *src) { + ENSURE_MSAN_INITED(); + GET_STORE_STACK_TRACE; + SIZE_T n = REAL(strlen)(src); + 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 + +INTERCEPTOR(char *, strndup, char *src, SIZE_T n) { + ENSURE_MSAN_INITED(); + GET_STORE_STACK_TRACE; + // On FreeBSD strndup() leverages strnlen(). + InterceptorScope interceptor_scope; + SIZE_T copy_size = REAL(strnlen)(src, n); + char *res = REAL(strndup)(src, n); + CopyShadowAndOrigin(res, src, copy_size, &stack); + __msan_unpoison(res + copy_size, 1); // \0 + return res; +} + +#if !SANITIZER_FREEBSD +INTERCEPTOR(char *, __strndup, char *src, SIZE_T n) { + ENSURE_MSAN_INITED(); + GET_STORE_STACK_TRACE; + SIZE_T copy_size = REAL(strnlen)(src, n); + char *res = REAL(__strndup)(src, n); + CopyShadowAndOrigin(res, src, copy_size, &stack); + __msan_unpoison(res + copy_size, 1); // \0 + return res; +} +#define MSAN_MAYBE_INTERCEPT___STRNDUP INTERCEPT_FUNCTION(__strndup) +#else +#define MSAN_MAYBE_INTERCEPT___STRNDUP +#endif + +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; +} + +INTERCEPTOR(char *, strcat, char *dest, const char *src) { // NOLINT + ENSURE_MSAN_INITED(); + GET_STORE_STACK_TRACE; + SIZE_T src_size = REAL(strlen)(src); + SIZE_T dest_size = REAL(strlen)(dest); + char *res = REAL(strcat)(dest, src); // NOLINT + CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack); + return res; +} + +INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { // NOLINT + ENSURE_MSAN_INITED(); + GET_STORE_STACK_TRACE; + SIZE_T dest_size = REAL(strlen)(dest); + SIZE_T copy_size = REAL(strnlen)(src, n); + char *res = REAL(strncat)(dest, src, n); // NOLINT + 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); \ + } + +#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) + +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(); + 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 + +#if SANITIZER_FREEBSD +INTERCEPTOR(int, stat, char *path, void *buf) { + ENSURE_MSAN_INITED(); + int res = REAL(stat)(path, buf); + if (!res) + __msan_unpoison(buf, __sanitizer::struct_stat_sz); + return res; +} +# define MSAN_INTERCEPT_STAT INTERCEPT_FUNCTION(stat) +#else +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; +} +# define MSAN_INTERCEPT_STAT INTERCEPT_FUNCTION(__xstat) +#endif + +#if !SANITIZER_FREEBSD +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; +} +#define MSAN_MAYBE_INTERCEPT___XSTAT64 INTERCEPT_FUNCTION(__xstat64) +#else +#define MSAN_MAYBE_INTERCEPT___XSTAT64 +#endif + +#if !SANITIZER_FREEBSD +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; +} +#define MSAN_MAYBE_INTERCEPT___LXSTAT INTERCEPT_FUNCTION(__lxstat) +#else +#define MSAN_MAYBE_INTERCEPT___LXSTAT +#endif + +#if !SANITIZER_FREEBSD +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; +} +#define MSAN_MAYBE_INTERCEPT___LXSTAT64 INTERCEPT_FUNCTION(__lxstat64) +#else +#define MSAN_MAYBE_INTERCEPT___LXSTAT64 +#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; +} +#define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64) +#else +#define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 +#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(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, Min(sz, srcaddr_sz)); + } + } + return res; +} + +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, 0, 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); + } +} + +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 = 0; + } + } + 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 = 0; + } + } + 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 + +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; +} + +INTERCEPTOR(char *, dlerror, int fake) { + ENSURE_MSAN_INITED(); + char *res = REAL(dlerror)(fake); + if (res != 0) __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_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(); + 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; +} + +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 : 0; + 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 == 0) { + 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; +} + +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 COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name) +#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__); \ + MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \ + ctx = (void *)&msan_ctx; \ + (void)ctx; \ + InterceptorScope interceptor_scope; \ + __msan_unpoison(__errno_location(), sizeof(int)); /* NOLINT */ \ + ENSURE_MSAN_INITED(); +#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 (map) ForEachMappedRegion(map, __msan_unpoison); \ + } while (false) + +#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) \ + 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" + +// 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_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) 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); + InitializeCommonInterceptors(); + + INTERCEPT_FUNCTION(mmap); + MSAN_MAYBE_INTERCEPT_MMAP64; + INTERCEPT_FUNCTION(posix_memalign); + MSAN_MAYBE_INTERCEPT_MEMALIGN; + INTERCEPT_FUNCTION(__libc_memalign); + INTERCEPT_FUNCTION(valloc); + MSAN_MAYBE_INTERCEPT_PVALLOC; + INTERCEPT_FUNCTION(malloc); + INTERCEPT_FUNCTION(calloc); + INTERCEPT_FUNCTION(realloc); + INTERCEPT_FUNCTION(free); + MSAN_MAYBE_INTERCEPT_CFREE; + INTERCEPT_FUNCTION(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(readlink); + INTERCEPT_FUNCTION(memcpy); + INTERCEPT_FUNCTION(memccpy); + 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); + MSAN_MAYBE_INTERCEPT___STRDUP; + INTERCEPT_FUNCTION(strndup); + MSAN_MAYBE_INTERCEPT___STRNDUP; + INTERCEPT_FUNCTION(strncpy); // NOLINT + INTERCEPT_FUNCTION(strlen); + INTERCEPT_FUNCTION(strnlen); + INTERCEPT_FUNCTION(gcvt); + INTERCEPT_FUNCTION(strcat); // NOLINT + INTERCEPT_FUNCTION(strncat); // NOLINT + INTERCEPT_STRTO(strtod); + INTERCEPT_STRTO(strtof); + INTERCEPT_STRTO(strtold); + INTERCEPT_STRTO(strtol); + INTERCEPT_STRTO(strtoul); + INTERCEPT_STRTO(strtoll); + INTERCEPT_STRTO(strtoull); + INTERCEPT_STRTO(wcstod); + INTERCEPT_STRTO(wcstof); + INTERCEPT_STRTO(wcstold); + INTERCEPT_STRTO(wcstol); + INTERCEPT_STRTO(wcstoul); + INTERCEPT_STRTO(wcstoll); + INTERCEPT_STRTO(wcstoull); + INTERCEPT_FUNCTION(vswprintf); + INTERCEPT_FUNCTION(swprintf); + INTERCEPT_FUNCTION(strxfrm); + INTERCEPT_FUNCTION(strxfrm_l); + 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(wcschr); + INTERCEPT_FUNCTION(wcscpy); + INTERCEPT_FUNCTION(wcscmp); + INTERCEPT_FUNCTION(getenv); + INTERCEPT_FUNCTION(setenv); + INTERCEPT_FUNCTION(putenv); + INTERCEPT_FUNCTION(gettimeofday); + INTERCEPT_FUNCTION(fcvt); + MSAN_MAYBE_INTERCEPT___FXSTAT; + MSAN_INTERCEPT_FSTATAT; + MSAN_INTERCEPT_STAT; + MSAN_MAYBE_INTERCEPT___LXSTAT; + MSAN_MAYBE_INTERCEPT___FXSTAT64; + MSAN_MAYBE_INTERCEPT___FXSTATAT64; + MSAN_MAYBE_INTERCEPT___XSTAT64; + MSAN_MAYBE_INTERCEPT___LXSTAT64; + INTERCEPT_FUNCTION(pipe); + INTERCEPT_FUNCTION(pipe2); + INTERCEPT_FUNCTION(socketpair); + INTERCEPT_FUNCTION(fgets); + MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED; + INTERCEPT_FUNCTION(getrlimit); + MSAN_MAYBE_INTERCEPT_GETRLIMIT64; + MSAN_INTERCEPT_UNAME; + INTERCEPT_FUNCTION(gethostname); + MSAN_MAYBE_INTERCEPT_EPOLL_WAIT; + MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT; + INTERCEPT_FUNCTION(recv); + INTERCEPT_FUNCTION(recvfrom); + INTERCEPT_FUNCTION(dladdr); + INTERCEPT_FUNCTION(dlerror); + INTERCEPT_FUNCTION(dl_iterate_phdr); + INTERCEPT_FUNCTION(getrusage); + INTERCEPT_FUNCTION(sigaction); + INTERCEPT_FUNCTION(signal); + INTERCEPT_FUNCTION(pthread_create); + INTERCEPT_FUNCTION(pthread_key_create); + INTERCEPT_FUNCTION(pthread_join); + INTERCEPT_FUNCTION(tzset); + INTERCEPT_FUNCTION(__cxa_atexit); + INTERCEPT_FUNCTION(shmat); + INTERCEPT_FUNCTION(fork); + + inited = 1; +} +} // namespace __msan |