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51 lines
2.3 KiB
51 lines
2.3 KiB
4 months ago
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// On x86_64, the kernel does not provide the faulting address for dereferences
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// of addresses greater than the 48-bit hardware addressable range, i.e.,
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// `siginfo.si_addr` is zero in ASan's SEGV signal handler. This test checks
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// that ASan does not misrepresent such cases as "NULL dereferences".
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// REQUIRES: x86_64-target-arch
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// RUN: %clang_asan %s -o %t
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// RUN: export %env_asan_opts=print_scariness=1
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// RUN: not %run %t 0x0000000000000000 2>&1 | FileCheck %s --check-prefixes=ZERO,HINT-PAGE0
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// RUN: not %run %t 0x0000000000000FFF 2>&1 | FileCheck %s --check-prefixes=LOW1,HINT-PAGE0
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// RUN: not %run %t 0x0000000000001000 2>&1 | FileCheck %s --check-prefixes=LOW2,HINT-NONE
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// RUN: not %run %t 0x4141414141414141 2>&1 | FileCheck %s --check-prefixes=HIGH,HINT-HIGHADDR
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// RUN: not %run %t 0xFFFFFFFFFFFFFFFF 2>&1 | FileCheck %s --check-prefixes=MAX,HINT-HIGHADDR
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#include <stdint.h>
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#include <stdlib.h>
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int main(int argc, const char *argv[]) {
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const char *hex = argv[1];
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uint64_t *addr = (uint64_t *)strtoull(hex, NULL, 16);
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uint64_t x = *addr; // segmentation fault
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return x;
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}
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// ZERO: SEGV on unknown address 0x000000000000 (pc
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// LOW1: SEGV on unknown address 0x000000000fff (pc
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// LOW2: SEGV on unknown address 0x000000001000 (pc
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// HIGH: {{BUS|SEGV}} on unknown address (pc
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// MAX: {{BUS|SEGV}} on unknown address (pc
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// HINT-PAGE0-NOT: Hint: this fault was caused by a dereference of a high value address
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// HINT-PAGE0: Hint: address points to the zero page.
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// HINT-NONE-NOT: Hint: this fault was caused by a dereference of a high value address
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// HINT-NONE-NOT: Hint: address points to the zero page.
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// HINT-HIGHADDR: Hint: this fault was caused by a dereference of a high value address
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// HINT-HIGHADDR-NOT: Hint: address points to the zero page.
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// ZERO: SCARINESS: 10 (null-deref)
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// LOW1: SCARINESS: 10 (null-deref)
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// LOW2: SCARINESS: 20 (wild-addr-read)
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// HIGH: SCARINESS: {{(20 \(wild-addr-read\))|(60 \(wild-jump\))}}
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// MAX: SCARINESS: {{(20 \(wild-addr-read\))|(60 \(wild-jump\))}}
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// TODO: Currently, register values are only printed on Mac. Once this changes,
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// remove the 'TODO_' prefix in the following lines.
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// TODO_HIGH,TODO_MAX: Register values:
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// TODO_HIGH: = 0x4141414141414141
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// TODO_MAX: = 0xffffffffffffffff
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