84dc97e51e
Supplement to PR #144073 Previously, _msan_check_mem_is_initialized.cpp_ initialized a 32-byte stack array, but checked the shadow for the offset range [12, 42), exceeding the stack array size. MSan does not guarantee that the shadow corresponding to the overflow part is 0, so it is undefined to require the overflow part to be unpoisoned.
29 lines
1018 B
C++
29 lines
1018 B
C++
// RUN: %clangxx_msan -O0 -g -DPOSITIVE %s -o %t
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// RUN: not %run %t 2>&1 | FileCheck %s
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// RUN: env MSAN_OPTIONS=verbosity=1 not %run %t 2>&1 | \
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// RUN: FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-VERBOSE
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// RUN: %clangxx_msan -O0 -g %s -o %t && %run %t
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#include <sanitizer/msan_interface.h>
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int main(void) {
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char p[32] = {};
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__msan_poison(p + 10, 2);
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__msan_check_mem_is_initialized(p, 10);
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__msan_check_mem_is_initialized(p + 12, 20);
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#ifdef POSITIVE
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__msan_check_mem_is_initialized(p + 5, 20);
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// CHECK: Uninitialized bytes in __msan_check_mem_is_initialized at offset 5 inside [0x{{.*}}, 20)
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// CHECK-VERBOSE: Shadow map [0x{{.*}}, 0x{{.*}}) of [0x{{.*}}, 0x{{.*}}), 20 bytes:
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// CHECK-VERBOSE: 0x{{.*}}: ..000000 0000ffff 00000000 00000000
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// CHECK-VERBOSE: 0x{{.*}}: 00000000 00...... ........ ........
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// CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
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// CHECK: #0 0x{{.*}}in main{{.*}}msan_check_mem_is_initialized.cpp:[[@LINE-7]]
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#endif
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return 0;
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}
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