956bab0381
Once part of PR #144648, follow the reviewer's advice and split into this separate PR. `unmap` works at page granularity, but supports an arbitrary non-zero size as an argument, which results in possible shadow undercleaning in the existing TSan implementation when `size % kShadowCell != 0`. This change introduces two test cases to verify the shadow cleaning effect in `unmap`. - java_heap_init2.cpp: Imitating java_heap_init cpp, verify the incomplete cleaning of meta - munmap_clear_shadow.c: verify the incomplete cleaning of shadow
35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// XFAIL: *
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#include "java.h"
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#include <errno.h>
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#include <sys/mman.h>
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int main() {
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// Test a non-regular kHeapSize
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// Previously __tsan_java_init failed because it encountered non-zero meta
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// shadow for the destination.
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size_t const kPageSize = sysconf(_SC_PAGESIZE);
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int const kSize = kPageSize - 1;
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jptr jheap2 = (jptr)mmap(0, kSize, PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_PRIVATE, -1, 0);
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if (jheap2 == (jptr)MAP_FAILED)
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return printf("mmap failed with %d\n", errno);
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__atomic_store_n((int *)(jheap2 + kSize - 3), 1, __ATOMIC_RELEASE);
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// Due to the previous incorrect meta-end calculation, the following munmap
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// did not clear the tail meta shadow.
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munmap((void *)jheap2, kSize);
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int const kHeapSize2 = kSize + 1;
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jheap2 = (jptr)mmap((void *)jheap2, kHeapSize2, PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_PRIVATE, -1, 0);
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if (jheap2 == (jptr)MAP_FAILED)
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return printf("second mmap failed with %d\n", errno);
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__tsan_java_init(jheap2, kHeapSize2);
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__tsan_java_move(jheap2, jheap2 + kHeapSize2 - 8, 8);
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fprintf(stderr, "DONE\n");
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return __tsan_java_fini();
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}
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// CHECK-NOT: WARNING: ThreadSanitizer: data race
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// CHECK: DONE
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