9ab590e3eb
Similar to qsort, bsearch can be called from non-instrumented code of glibc. When it happends tls for arguments can be in uninitialized state. Unlike to qsort, bsearch does not move data, so we don't need to check or initialize searched memory or key. Intrumented comparator will do that on it's own. Differential Revision: https://reviews.llvm.org/D107387
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// __NO_INLINE__ is defined so bsearch needs interceptor.
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// RUN: %clangxx_msan -O0 -g %s -o %t && %run %t
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// RUN: %clangxx_msan -DPOISON_DATA -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
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// RUN: %clangxx_msan -DPOISON_KEY -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
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// __NO_INLINE__ is undefined so bsearch should be inlined and instrumented and still work as expected.
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// RUN: %clangxx_msan -O2 -g %s -o %t && %run %t
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// RUN: %clangxx_msan -DPOISON_DATA -O2 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
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// RUN: %clangxx_msan -DPOISON_KEY -O2 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
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#include <assert.h>
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#include <stdlib.h>
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#include <sanitizer/msan_interface.h>
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long z;
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__attribute__((noinline, optnone)) void
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poison_msan_param_tls(long a, long b, long c, long d, long e, long f) {
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z = a + b + c + d + e + f;
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}
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static int compar(const void *a, const void *b) {
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int r = *(const long *)a - *(const long *)b;
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long x;
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__msan_poison(&x, sizeof(x));
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poison_msan_param_tls(x, x, x, x, x, x);
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return r;
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}
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int main(int argc, char *argv[]) {
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constexpr size_t SZ = 27;
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long p[SZ + 1];
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for (int i = 0; i < SZ + 1; ++i)
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p[i] = i;
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p[SZ] = SZ / 3;
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#if defined(POISON_DATA)
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__msan_poison(p, sizeof(long) * SZ / 2);
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#elif defined(POISON_KEY)
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__msan_poison(p + SZ, sizeof(long));
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#endif
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const long *r = (const long *)bsearch(p + SZ, p, SZ, sizeof(long), compar);
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// CHECK: MemorySanitizer: use-of-uninitialized-value
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assert(r == p + SZ / 3);
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return 0;
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}
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