[compiler-rt] r302781 - [asan] Recommit of r301904: Add strndup/__strndup interceptors
Kostya Serebryany via llvm-commits
llvm-commits at lists.llvm.org
Wed May 17 20:16:10 PDT 2017
r303324 disables the feature and its tests.
On Wed, May 17, 2017 at 5:11 PM, Kostya Serebryany <kcc at google.com> wrote:
> This breaks a very simple test.
> Please revert or fix ASAP.
>
> #include <string.h>
> char x[1] = {'x'};
> char *ptr;
> int main() {
> ptr = strndup(x, 1);
> }
>
> clang -fsanitize=address -g strndup_test.cc && ./a.out
> =================================================================
> ==14657==ERROR: AddressSanitizer: global-buffer-overflow on address
> 0x000000713ba1 at pc 0x00000042c616 bp 0x7ffeb4cadff0 sp 0x7ffeb4cad790
> READ of size 2 at 0x000000713ba1 thread T0
> #0 0x42c615 in strndup
> #1 0x4e4419 in main strndup_test.cc:5:9
>
>
>
> On Thu, May 11, 2017 at 1:53 AM, Pierre Gousseau via llvm-commits <
> llvm-commits at lists.llvm.org> wrote:
>
>> Author: pgousseau
>> Date: Thu May 11 03:53:24 2017
>> New Revision: 302781
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=302781&view=rev
>> Log:
>> [asan] Recommit of r301904: Add strndup/__strndup interceptors
>>
>> Fix undeclared __interceptor_malloc in esan_interceptors.cc
>> Fix undeclared strnlen on OSX
>>
>> Differential Revision: https://reviews.llvm.org/D31457
>>
>> Added:
>> compiler-rt/trunk/test/asan/TestCases/Posix/strndup_oob_test.cc
>> compiler-rt/trunk/test/msan/strndup.cc
>> Modified:
>> compiler-rt/trunk/lib/asan/asan_flags.cc
>> compiler-rt/trunk/lib/asan/tests/asan_str_test.cc
>> compiler-rt/trunk/lib/esan/esan_interceptors.cpp
>> compiler-rt/trunk/lib/msan/msan_interceptors.cc
>> compiler-rt/trunk/lib/msan/tests/msan_test.cc
>> compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_
>> interceptors.inc
>> compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc
>> compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_
>> interceptors.h
>> compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_test_utils.h
>>
>> Modified: compiler-rt/trunk/lib/asan/asan_flags.cc
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/as
>> an/asan_flags.cc?rev=302781&r1=302780&r2=302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/asan/asan_flags.cc (original)
>> +++ compiler-rt/trunk/lib/asan/asan_flags.cc Thu May 11 03:53:24 2017
>> @@ -194,6 +194,10 @@ void InitializeFlags() {
>> Report("WARNING: strchr* interceptors are enabled even though "
>> "replace_str=0. Use intercept_strchr=0 to disable them.");
>> }
>> + if (!f->replace_str && common_flags()->intercept_strndup) {
>> + Report("WARNING: strndup* interceptors are enabled even though "
>> + "replace_str=0. Use intercept_strndup=0 to disable them.");
>> + }
>> }
>>
>> } // namespace __asan
>>
>> Modified: compiler-rt/trunk/lib/asan/tests/asan_str_test.cc
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/as
>> an/tests/asan_str_test.cc?rev=302781&r1=302780&r2=302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/asan/tests/asan_str_test.cc (original)
>> +++ compiler-rt/trunk/lib/asan/tests/asan_str_test.cc Thu May 11
>> 03:53:24 2017
>> @@ -154,6 +154,27 @@ TEST(AddressSanitizer, MAYBE_StrDupOOBTe
>> free(str);
>> }
>>
>> +#if SANITIZER_TEST_HAS_STRNDUP
>> +TEST(AddressSanitizer, MAYBE_StrNDupOOBTest) {
>> + size_t size = Ident(42);
>> + char *str = MallocAndMemsetString(size);
>> + char *new_str;
>> + // Normal strndup calls.
>> + str[size - 1] = '\0';
>> + new_str = strndup(str, size - 13);
>> + free(new_str);
>> + new_str = strndup(str + size - 1, 13);
>> + free(new_str);
>> + // Argument points to not allocated memory.
>> + EXPECT_DEATH(Ident(strndup(str - 1, 13)), LeftOOBReadMessage(1));
>> + EXPECT_DEATH(Ident(strndup(str + size, 13)), RightOOBReadMessage(0));
>> + // Overwrite the terminating '\0' and hit unallocated memory.
>> + str[size - 1] = 'z';
>> + EXPECT_DEATH(Ident(strndup(str, size + 13)), RightOOBReadMessage(0));
>> + free(str);
>> +}
>> +#endif // SANITIZER_TEST_HAS_STRNDUP
>> +
>> TEST(AddressSanitizer, StrCpyOOBTest) {
>> size_t to_size = Ident(30);
>> size_t from_size = Ident(6); // less than to_size
>>
>> Modified: compiler-rt/trunk/lib/esan/esan_interceptors.cpp
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/es
>> an/esan_interceptors.cpp?rev=302781&r1=302780&r2=302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/esan/esan_interceptors.cpp (original)
>> +++ compiler-rt/trunk/lib/esan/esan_interceptors.cpp Thu May 11 03:53:24
>> 2017
>> @@ -31,6 +31,8 @@ using namespace __esan; // NOLINT
>> // Get the per-platform defines for what is possible to intercept
>> #include "sanitizer_common/sanitizer_platform_interceptors.h"
>>
>> +DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr)
>> +
>> // TODO(bruening): tsan disables several interceptors (getpwent, etc.)
>> claiming
>> // that interception is a perf hit: should we do the same?
>>
>>
>> Modified: compiler-rt/trunk/lib/msan/msan_interceptors.cc
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/ms
>> an/msan_interceptors.cc?rev=302781&r1=302780&r2=302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/msan/msan_interceptors.cc (original)
>> +++ compiler-rt/trunk/lib/msan/msan_interceptors.cc Thu May 11 03:53:24
>> 2017
>> @@ -341,33 +341,6 @@ INTERCEPTOR(char *, __strdup, char *src)
>> #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);
>> @@ -1371,6 +1344,13 @@ int OnExit() {
>> 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)
>> +
>> #include "sanitizer_common/sanitizer_platform_interceptors.h"
>> #include "sanitizer_common/sanitizer_common_interceptors.inc"
>>
>> @@ -1538,8 +1518,6 @@ void InitializeInterceptors() {
>> INTERCEPT_FUNCTION(stpcpy); // NOLINT
>> INTERCEPT_FUNCTION(strdup);
>> MSAN_MAYBE_INTERCEPT___STRDUP;
>> - INTERCEPT_FUNCTION(strndup);
>> - MSAN_MAYBE_INTERCEPT___STRNDUP;
>> INTERCEPT_FUNCTION(strncpy); // NOLINT
>> INTERCEPT_FUNCTION(gcvt);
>> INTERCEPT_FUNCTION(strcat); // NOLINT
>>
>> Modified: compiler-rt/trunk/lib/msan/tests/msan_test.cc
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/ms
>> an/tests/msan_test.cc?rev=302781&r1=302780&r2=302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/msan/tests/msan_test.cc (original)
>> +++ compiler-rt/trunk/lib/msan/tests/msan_test.cc Thu May 11 03:53:24
>> 2017
>> @@ -1581,7 +1581,8 @@ TEST(MemorySanitizer, strdup) {
>> TEST(MemorySanitizer, strndup) {
>> char buf[4] = "abc";
>> __msan_poison(buf + 2, sizeof(*buf));
>> - char *x = strndup(buf, 3);
>> + char *x;
>> + EXPECT_UMR(x = strndup(buf, 3));
>> EXPECT_NOT_POISONED(x[0]);
>> EXPECT_NOT_POISONED(x[1]);
>> EXPECT_POISONED(x[2]);
>> @@ -1593,7 +1594,8 @@ TEST(MemorySanitizer, strndup_short) {
>> char buf[4] = "abc";
>> __msan_poison(buf + 1, sizeof(*buf));
>> __msan_poison(buf + 2, sizeof(*buf));
>> - char *x = strndup(buf, 2);
>> + char *x;
>> + EXPECT_UMR(x = strndup(buf, 2));
>> EXPECT_NOT_POISONED(x[0]);
>> EXPECT_POISONED(x[1]);
>> EXPECT_NOT_POISONED(x[2]);
>>
>> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_
>> interceptors.inc
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sa
>> nitizer_common/sanitizer_common_interceptors.inc?rev=302781&
>> r1=302780&r2=302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_interceptors.inc
>> (original)
>> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_interceptors.inc
>> Thu May 11 03:53:24 2017
>> @@ -34,6 +34,8 @@
>> // COMMON_INTERCEPTOR_MEMSET_IMPL
>> // COMMON_INTERCEPTOR_MEMMOVE_IMPL
>> // COMMON_INTERCEPTOR_MEMCPY_IMPL
>> +// COMMON_INTERCEPTOR_COPY_STRING
>> +// COMMON_INTERCEPTOR_STRNDUP_IMPL
>> //===------------------------------------------------------
>> ----------------===//
>>
>> #include "interception/interception.h"
>> @@ -217,6 +219,25 @@ bool PlatformHasDifferentMemcpyAndMemmov
>> }
>> #endif
>>
>> +#ifndef COMMON_INTERCEPTOR_COPY_STRING
>> +#define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size) {}
>> +#endif
>> +
>> +#ifndef COMMON_INTERCEPTOR_STRNDUP_IMPL
>> +#define COMMON_INTERCEPTOR_STRNDUP_IMPL(ctx, s, size)
>> \
>> + COMMON_INTERCEPTOR_ENTER(ctx, strndup, s, size);
>> \
>> + uptr from_length = internal_strnlen(s, size);
>> \
>> + uptr copy_length = Min(size, from_length);
>> \
>> + char *new_mem = (char *)WRAP(malloc)(copy_length + 1);
>> \
>> + if (common_flags()->intercept_strndup) {
>> \
>> + COMMON_INTERCEPTOR_READ_RANGE(ctx, s, copy_length + 1);
>> \
>> + }
>> \
>> + COMMON_INTERCEPTOR_COPY_STRING(ctx, new_mem, s, copy_length);
>> \
>> + internal_memcpy(new_mem, s, copy_length);
>> \
>> + new_mem[copy_length] = '\0';
>> \
>> + return new_mem;
>> +#endif
>> +
>> struct FileMetadata {
>> // For open_memstream().
>> char **addr;
>> @@ -300,6 +321,26 @@ INTERCEPTOR(SIZE_T, strnlen, const char
>> #define INIT_STRNLEN
>> #endif
>>
>> +#if SANITIZER_INTERCEPT_STRNDUP
>> +INTERCEPTOR(char*, strndup, const char *s, uptr size) {
>> + void *ctx;
>> + COMMON_INTERCEPTOR_STRNDUP_IMPL(ctx, s, size);
>> +}
>> +#define INIT_STRNDUP COMMON_INTERCEPT_FUNCTION(strndup)
>> +#else
>> +#define INIT_STRNDUP
>> +#endif // SANITIZER_INTERCEPT_STRNDUP
>> +
>> +#if SANITIZER_INTERCEPT___STRNDUP
>> +INTERCEPTOR(char*, __strndup, const char *s, uptr size) {
>> + void *ctx;
>> + COMMON_INTERCEPTOR_STRNDUP_IMPL(ctx, s, size);
>> +}
>> +#define INIT___STRNDUP COMMON_INTERCEPT_FUNCTION(__strndup)
>> +#else
>> +#define INIT___STRNDUP
>> +#endif // SANITIZER_INTERCEPT___STRNDUP
>> +
>> #if SANITIZER_INTERCEPT_TEXTDOMAIN
>> INTERCEPTOR(char*, textdomain, const char *domainname) {
>> void *ctx;
>> @@ -6163,6 +6204,8 @@ static void InitializeCommonInterceptors
>> INIT_TEXTDOMAIN;
>> INIT_STRLEN;
>> INIT_STRNLEN;
>> + INIT_STRNDUP;
>> + INIT___STRNDUP;
>> INIT_STRCMP;
>> INIT_STRNCMP;
>> INIT_STRCASECMP;
>>
>> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sa
>> nitizer_common/sanitizer_flags.inc?rev=302781&r1=302780&r2=
>> 302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc (original)
>> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc Thu May
>> 11 03:53:24 2017
>> @@ -195,6 +195,9 @@ COMMON_FLAG(bool, intercept_strpbrk, tru
>> COMMON_FLAG(bool, intercept_strlen, true,
>> "If set, uses custom wrappers for strlen and strnlen
>> functions "
>> "to find more errors.")
>> +COMMON_FLAG(bool, intercept_strndup, true,
>> + "If set, uses custom wrappers for strndup functions "
>> + "to find more errors.")
>> COMMON_FLAG(bool, intercept_strchr, true,
>> "If set, uses custom wrappers for strchr, strchrnul, and
>> strrchr "
>> "functions to find more errors.")
>>
>> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_
>> interceptors.h
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sa
>> nitizer_common/sanitizer_platform_interceptors.h?rev=302781&
>> r1=302780&r2=302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_interceptors.h
>> (original)
>> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_interceptors.h
>> Thu May 11 03:53:24 2017
>> @@ -25,6 +25,12 @@
>> # define SI_NOT_WINDOWS 0
>> #endif
>>
>> +#if SANITIZER_POSIX
>> +# define SI_POSIX 1
>> +#else
>> +# define SI_POSIX 0
>> +#endif
>> +
>> #if SANITIZER_LINUX && !SANITIZER_ANDROID
>> # define SI_LINUX_NOT_ANDROID 1
>> #else
>> @@ -69,6 +75,12 @@
>> # define SI_UNIX_NOT_MAC 0
>> #endif
>>
>> +#if SANITIZER_LINUX && !SANITIZER_FREEBSD
>> +# define SI_LINUX_NOT_FREEBSD 1
>> +# else
>> +# define SI_LINUX_NOT_FREEBSD 0
>> +#endif
>> +
>> #define SANITIZER_INTERCEPT_STRLEN 1
>> #define SANITIZER_INTERCEPT_STRNLEN SI_NOT_MAC
>> #define SANITIZER_INTERCEPT_STRCMP 1
>> @@ -86,6 +98,8 @@
>> #define SANITIZER_INTERCEPT_MEMMOVE 1
>> #define SANITIZER_INTERCEPT_MEMCPY 1
>> #define SANITIZER_INTERCEPT_MEMCMP 1
>> +#define SANITIZER_INTERCEPT_STRNDUP SI_POSIX
>> +#define SANITIZER_INTERCEPT___STRNDUP SI_LINUX_NOT_FREEBSD
>> #if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \
>> __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070
>> # define SI_MAC_DEPLOYMENT_BELOW_10_7 1
>>
>> Modified: compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_test_
>> utils.h
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sa
>> nitizer_common/tests/sanitizer_test_utils.h?rev=302781&r1=
>> 302780&r2=302781&view=diff
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_test_utils.h
>> (original)
>> +++ compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_test_utils.h
>> Thu May 11 03:53:24 2017
>> @@ -124,4 +124,10 @@ static inline uint32_t my_rand() {
>> # define SANITIZER_TEST_HAS_PRINTF_L 0
>> #endif
>>
>> +#if !defined(_MSC_VER)
>> +# define SANITIZER_TEST_HAS_STRNDUP 1
>> +#else
>> +# define SANITIZER_TEST_HAS_STRNDUP 0
>> +#endif
>> +
>> #endif // SANITIZER_TEST_UTILS_H
>>
>> Added: compiler-rt/trunk/test/asan/TestCases/Posix/strndup_oob_test.cc
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/
>> asan/TestCases/Posix/strndup_oob_test.cc?rev=302781&view=auto
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/test/asan/TestCases/Posix/strndup_oob_test.cc
>> (added)
>> +++ compiler-rt/trunk/test/asan/TestCases/Posix/strndup_oob_test.cc Thu
>> May 11 03:53:24 2017
>> @@ -0,0 +1,26 @@
>> +// RUN: %clangxx_asan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
>> +// RUN: %clangxx_asan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s
>> +// RUN: %clangxx_asan -O2 %s -o %t && not %run %t 2>&1 | FileCheck %s
>> +// RUN: %clangxx_asan -O3 %s -o %t && not %run %t 2>&1 | FileCheck %s
>> +
>> +// When built as C on Linux, strndup is transformed to __strndup.
>> +// RUN: %clangxx_asan -O3 -xc %s -o %t && not %run %t 2>&1 | FileCheck %s
>> +
>> +// UNSUPPORTED: win32
>> +
>> +#include <string.h>
>> +
>> +char kString[] = "foo";
>> +
>> +int main(int argc, char **argv) {
>> + char *copy = strndup(kString, 2);
>> + int x = copy[2 + argc]; // BOOM
>> + // CHECK: AddressSanitizer: heap-buffer-overflow
>> + // CHECK: #0 {{.*}}main {{.*}}strndup_oob_test.cc:[[@LINE-2]]
>> + // CHECK-LABEL: allocated by thread T{{.*}} here:
>> + // CHECK: #{{[01]}} {{.*}}strndup
>> + // CHECK: #{{.*}}main {{.*}}strndup_oob_test.cc:[[@LINE-6]]
>> + // CHECK-LABEL: SUMMARY
>> + // CHECK: strndup_oob_test.cc:[[@LINE-7]]
>> + return x;
>> +}
>>
>> Added: compiler-rt/trunk/test/msan/strndup.cc
>> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/
>> msan/strndup.cc?rev=302781&view=auto
>> ============================================================
>> ==================
>> --- compiler-rt/trunk/test/msan/strndup.cc (added)
>> +++ compiler-rt/trunk/test/msan/strndup.cc Thu May 11 03:53:24 2017
>> @@ -0,0 +1,28 @@
>> +// RUN: %clangxx_msan %s -o %t && not %run %t 2>&1 | FileCheck
>> --check-prefix=ON %s
>> +// RUN: %clangxx_msan %s -o %t && MSAN_OPTIONS=intercept_strndup=0 %run
>> %t 2>&1 | FileCheck --check-prefix=OFF --allow-empty %s
>> +
>> +// When built as C on Linux, strndup is transformed to __strndup.
>> +// RUN: %clangxx_msan -O3 -xc %s -o %t && not %run %t 2>&1 | FileCheck
>> --check-prefix=ON %s
>> +
>> +// UNSUPPORTED: win32
>> +
>> +#include <assert.h>
>> +#include <stdlib.h>
>> +#include <string.h>
>> +#include <sanitizer/msan_interface.h>
>> +
>> +int main(int argc, char **argv) {
>> + char kString[4] = "abc";
>> + __msan_poison(kString + 2, 1);
>> + char *copy = strndup(kString, 4); // BOOM
>> + assert(__msan_test_shadow(copy, 4) == 2); // Poisoning is preserved.
>> + free(copy);
>> + return 0;
>> + // ON: Uninitialized bytes in __interceptor_{{(__)?}}strndup at offset
>> 2 inside [{{.*}}, 4)
>> + // ON: MemorySanitizer: use-of-uninitialized-value
>> + // ON: #0 {{.*}}main {{.*}}strndup.cc:[[@LINE-6]]
>> + // ON-LABEL: SUMMARY
>> + // ON: {{.*}}strndup.cc:[[@LINE-8]]
>> + // OFF-NOT: MemorySanitizer
>> +}
>> +
>>
>>
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