diff options
Diffstat (limited to 'test')
-rw-r--r-- | test/asan/TestCases/Posix/high-address-dereference.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/test/asan/TestCases/Posix/high-address-dereference.c b/test/asan/TestCases/Posix/high-address-dereference.c new file mode 100644 index 000000000..785033028 --- /dev/null +++ b/test/asan/TestCases/Posix/high-address-dereference.c @@ -0,0 +1,50 @@ +// On x86_64, the kernel does not provide the faulting address for dereferences +// of addresses greater than the 48-bit hardware addressable range, i.e., +// `siginfo.si_addr` is zero in ASan's SEGV signal handler. This test checks +// that ASan does not misrepresent such cases as "NULL dereferences". + +// REQUIRES: x86_64-target-arch +// RUN: %clang_asan %s -o %t +// RUN: export %env_asan_opts=print_scariness=1 +// RUN: not %run %t 0x0000000000000000 2>&1 | FileCheck %s --check-prefixes=ZERO,HINT-PAGE0 +// RUN: not %run %t 0x0000000000000FFF 2>&1 | FileCheck %s --check-prefixes=LOW1,HINT-PAGE0 +// RUN: not %run %t 0x0000000000001000 2>&1 | FileCheck %s --check-prefixes=LOW2,HINT-NONE +// RUN: not %run %t 0x4141414141414141 2>&1 | FileCheck %s --check-prefixes=HIGH,HINT-HIGHADDR +// RUN: not %run %t 0xFFFFFFFFFFFFFFFF 2>&1 | FileCheck %s --check-prefixes=MAX,HINT-HIGHADDR + +#include <stdint.h> +#include <stdlib.h> + +int main(int argc, const char *argv[]) { + const char *hex = argv[1]; + uint64_t *addr = (uint64_t *)strtoull(hex, NULL, 16); + uint64_t x = *addr; // segmentation fault + return x; +} + +// ZERO: SEGV on unknown address 0x000000000000 (pc +// LOW1: SEGV on unknown address 0x000000000fff (pc +// LOW2: SEGV on unknown address 0x000000001000 (pc +// HIGH: SEGV on unknown address (pc +// MAX: SEGV on unknown address (pc + +// HINT-PAGE0-NOT: Hint: this fault was caused by a dereference of a high value address +// HINT-PAGE0: Hint: address points to the zero page. + +// HINT-NONE-NOT: Hint: this fault was caused by a dereference of a high value address +// HINT-NONE-NOT: Hint: address points to the zero page. + +// HINT-HIGHADDR: Hint: this fault was caused by a dereference of a high value address +// HINT-HIGHADDR-NOT: Hint: address points to the zero page. + +// ZERO: SCARINESS: 10 (null-deref) +// LOW1: SCARINESS: 10 (null-deref) +// LOW2: SCARINESS: 20 (wild-addr-read) +// HIGH: SCARINESS: 20 (wild-addr-read) +// MAX: SCARINESS: 20 (wild-addr-read) + +// TODO: Currently, register values are only printed on Mac. Once this changes, +// remove the 'TODO_' prefix in the following lines. +// TODO_HIGH,TODO_MAX: Register values: +// TODO_HIGH: = 0x4141414141414141 +// TODO_MAX: = 0xffffffffffffffff |