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35 lines
937 B
35 lines
937 B
4 months ago
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// Test strchr for strict_string_checks=false does not look beyond necessary
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// char.
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// RUN: %clang_asan %s -o %t
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// RUN: %env_asan_opts=strict_string_checks=false %run %t 2>&1
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// RUN: %env_asan_opts=strict_string_checks=true not %run %t 2>&1 | FileCheck %s
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#include <assert.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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int main(int argc, char **argv) {
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size_t page_size = sysconf(_SC_PAGE_SIZE);
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size_t size = 2 * page_size;
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char *s = (char *)mmap(0, size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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assert(s);
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assert(((uintptr_t)s & (page_size - 1)) == 0);
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memset(s, 'o', size);
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s[size - 1] = 0;
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char *p = s + page_size - 1;
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*p = 'x';
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if (mprotect(p + 1, 1, PROT_NONE))
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return 1;
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char *r = strchr(s, 'x');
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// CHECK: AddressSanitizer: {{SEGV|BUS}} on unknown address
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assert(r == p);
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return 0;
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}
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