| 1 | // On x86_64, the kernel does not provide the faulting address for dereferences |
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| 2 | // of addresses greater than the 48-bit hardware addressable range, i.e., |
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| 3 | // `siginfo.si_addr` is zero in ASan's SEGV signal handler. This test checks |
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| 4 | // that ASan does not misrepresent such cases as "NULL dereferences". |
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| 5 | |
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| 6 | // REQUIRES: x86_64-target-arch |
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| 7 | // RUN: %clang_asan %s -o %t |
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| 8 | // RUN: export %env_asan_opts=print_scariness=1 |
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| 9 | // RUN: not %run %t 0x0000000000000000 2>&1 | FileCheck %s --check-prefixes=ZERO,HINT-PAGE0 |
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| 10 | // RUN: not %run %t 0x0000000000000FFF 2>&1 | FileCheck %s --check-prefixes=LOW1,HINT-PAGE0 |
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| 11 | // RUN: not %run %t 0x0000000000001000 2>&1 | FileCheck %s --check-prefixes=LOW2,HINT-NONE |
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| 12 | // RUN: not %run %t 0x4141414141414141 2>&1 | FileCheck %s --check-prefixes=HIGH,HINT-HIGHADDR |
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| 13 | // RUN: not %run %t 0xFFFFFFFFFFFFFFFF 2>&1 | FileCheck %s --check-prefixes=MAX,HINT-HIGHADDR |
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| 14 | |
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| 15 | #include <stdint.h> |
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| 16 | #include <stdlib.h> |
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| 17 | |
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| 18 | int main(int argc, const char *argv[]) { |
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| 19 | const char *hex = argv[1]; |
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| 20 | uint64_t *addr = (uint64_t *)strtoull(nptr: hex, NULL, base: 16); |
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| 21 | uint64_t x = *addr; // segmentation fault |
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| 22 | return x; |
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| 23 | } |
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| 24 | |
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| 25 | // ZERO: SEGV on unknown address 0x000000000000 (pc |
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| 26 | // LOW1: SEGV on unknown address 0x000000000fff (pc |
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| 27 | // LOW2: SEGV on unknown address 0x000000001000 (pc |
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| 28 | // HIGH: {{BUS|SEGV}} on unknown address (pc |
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| 29 | // MAX: {{BUS|SEGV}} on unknown address (pc |
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| 30 | |
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| 31 | // HINT-PAGE0-NOT: Hint: this fault was caused by a dereference of a high value address |
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| 32 | // HINT-PAGE0: Hint: address points to the zero page. |
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| 33 | |
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| 34 | // HINT-NONE-NOT: Hint: this fault was caused by a dereference of a high value address |
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| 35 | // HINT-NONE-NOT: Hint: address points to the zero page. |
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| 36 | |
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| 37 | // HINT-HIGHADDR: Hint: this fault was caused by a dereference of a high value address |
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| 38 | // HINT-HIGHADDR-NOT: Hint: address points to the zero page. |
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| 39 | |
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| 40 | // ZERO: SCARINESS: 10 (null-deref) |
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| 41 | // LOW1: SCARINESS: 10 (null-deref) |
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| 42 | // LOW2: SCARINESS: 20 (wild-addr-read) |
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| 43 | // HIGH: SCARINESS: {{(20 \(wild-addr-read\))|(60 \(wild-jump\))}} |
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| 44 | // MAX: SCARINESS: {{(20 \(wild-addr-read\))|(60 \(wild-jump\))}} |
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| 45 | |
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| 46 | // TODO: Currently, register values are only printed on Mac. Once this changes, |
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| 47 | // remove the 'TODO_' prefix in the following lines. |
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| 48 | // TODO_HIGH,TODO_MAX: Register values: |
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| 49 | // TODO_HIGH: = 0x4141414141414141 |
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| 50 | // TODO_MAX: = 0xffffffffffffffff |
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| 51 | |
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