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// Test for ASAN_OPTIONS=start_deactivated=1 mode.
// Main executable is uninstrumented, but linked to ASan runtime. The shared
// library is instrumented. Memory errors before dlopen are not detected.
// RUN: %clangxx_asan -O0 -DSHARED_LIB %s -std=c++11 -fPIC -shared -o %t-so.so
// RUN: %clangxx -O0 %s -std=c++11 -c -o %t.o
// RUN: %clangxx_asan -O0 %t.o %libdl -o %t
// RUN: %env_asan_opts=start_deactivated=1,allocator_may_return_null=0 \
// RUN: ASAN_ACTIVATION_OPTIONS=allocator_may_return_null=1 not %run %t 2>&1 | FileCheck %s
// RUN: %env_asan_opts=start_deactivated=1 \
// RUN: ASAN_ACTIVATION_OPTIONS=help=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-HELP
// RUN: %env_asan_opts=start_deactivated=1,verbosity=1 \
// RUN: ASAN_ACTIVATION_OPTIONS=help=1,handle_segv=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-UNSUPPORTED
// RUN: %env_asan_opts=start_deactivated=1 \
// RUN: ASAN_ACTIVATION_OPTIONS=help=1,handle_segv=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-UNSUPPORTED-V0
// Check that verbosity=1 in activation flags affects reporting of unrecognized activation flags.
// RUN: %env_asan_opts=start_deactivated=1 \
// RUN: ASAN_ACTIVATION_OPTIONS=help=1,handle_segv=0,verbosity=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-UNSUPPORTED
// XFAIL: arm-linux-gnueabi
// UNSUPPORTED: ios
// END.
#if !defined(SHARED_LIB)
#include <assert.h>
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <string>
#include "sanitizer/asan_interface.h"
void test_malloc_shadow(char *p, size_t sz, bool expect_redzones) {
// Last byte of the left redzone, if present.
assert((char *)__asan_region_is_poisoned(p - 1, sz + 1) ==
(expect_redzones ? p - 1 : nullptr));
// The user memory.
assert((char *)__asan_region_is_poisoned(p, sz) == nullptr);
// First byte of the right redzone, if present.
assert((char *)__asan_region_is_poisoned(p, sz + 1) ==
(expect_redzones ? p + sz : nullptr));
}
typedef void (*Fn)();
int main(int argc, char *argv[]) {
constexpr unsigned nPtrs = 200;
char *ptrs[nPtrs];
// Before activation: no redzones.
for (size_t sz = 1; sz < nPtrs; ++sz) {
ptrs[sz] = (char *)malloc(sz);
test_malloc_shadow(ptrs[sz], sz, false);
}
// Create a honey pot for the future, instrumented, allocations. Since the
// quarantine is disabled, chunks are going to be recycled right away and
// reused for the new allocations. New allocations must get the proper
// redzones anyway, whether it's a fresh or reused allocation.
constexpr size_t HoneyPotBlockSize = 4096;
constexpr int HoneyPotSize = 200;
char *honeyPot[HoneyPotSize];
for (int i = 1; i < HoneyPotSize; ++i) {
honeyPot[i] = (char *)malloc(HoneyPotBlockSize);
test_malloc_shadow(honeyPot[i], HoneyPotBlockSize, false);
}
for (int i = 1; i < HoneyPotSize; ++i)
free(honeyPot[i]);
std::string path = std::string(argv[0]) + "-so.so";
void *dso = dlopen(path.c_str(), RTLD_NOW);
if (!dso) {
fprintf(stderr, "dlopen failed: %s\n", dlerror());
return 1;
}
// After this line ASan is activated and starts detecting errors.
void *fn = dlsym(dso, "do_another_bad_thing");
if (!fn) {
fprintf(stderr, "dlsym failed: %s\n", dlerror());
return 1;
}
// After activation: redzones.
for (int i = 1; i < HoneyPotSize; ++i) {
honeyPot[i] = (char *)malloc(HoneyPotBlockSize);
test_malloc_shadow(honeyPot[i], HoneyPotBlockSize, true);
}
{
char *p = (char *)malloc(HoneyPotBlockSize);
test_malloc_shadow(p, HoneyPotBlockSize, true);
free(p);
}
for (int i = 1; i < HoneyPotSize; ++i)
free(honeyPot[i]);
// Pre-existing allocations got redzones, too.
for (size_t sz = 1; sz < nPtrs; ++sz) {
test_malloc_shadow(ptrs[sz], sz, true);
free(ptrs[sz]);
}
// Test that ASAN_ACTIVATION_OPTIONS=allocator_may_return_null=1 has effect.
void *p = malloc((unsigned long)-2);
assert(!p);
// CHECK: WARNING: AddressSanitizer failed to allocate 0xfff{{.*}} bytes
((Fn)fn)();
// CHECK: AddressSanitizer: heap-buffer-overflow
// CHECK: READ of size 1
// CHECK: {{#0 .* in do_another_bad_thing}}
// CHECK: is located 5 bytes to the right of 100-byte region
// CHECK: in do_another_bad_thing
return 0;
}
#else // SHARED_LIB
#include <stdio.h>
#include <stdlib.h>
extern "C" void do_another_bad_thing() {
char *volatile p = (char *)malloc(100);
printf("%hhx\n", p[105]);
}
#endif // SHARED_LIB
// help=1 in activation flags lists only flags are are supported at activation
// CHECK-HELP: Available flags for {{.*}}Sanitizer:
// CHECK-HELP-NOT: handle_segv
// CHECK-HELP: max_redzone
// CHECK-HELP-NOT: handle_segv
// unsupported activation flags produce a warning ...
// CHECK-UNSUPPORTED: WARNING: found 1 unrecognized
// CHECK-UNSUPPORTED: handle_segv
// ... but not at verbosity=0
// CHECK-UNSUPPORTED-V0-NOT: WARNING: found {{.*}} unrecognized
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