derek.holloway
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50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
// Test mmap behavior when map address is below shadow range.
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// With MAP_FIXED, we return EINVAL.
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// Without MAP_FIXED, we ignore the address hint and map somewhere in
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// application range.
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// RUN: %clangxx_msan -O0 -DFIXED=0 %s -o %t && %run %t
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// RUN: %clangxx_msan -O0 -DFIXED=1 %s -o %t && %run %t
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// RUN: %clangxx_msan -O0 -DFIXED=0 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t
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// RUN: %clangxx_msan -O0 -DFIXED=1 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t
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#include <assert.h>
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#include <errno.h>
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#include <stdint.h>
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#include <sys/mman.h>
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int main(void) {
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// Hint address just below shadow.
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#if defined(__FreeBSD__) && defined(__x86_64__)
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uintptr_t hint = 0x0f0000000000ULL;
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const uintptr_t app_start = 0x000000000000ULL;
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#elif defined(__x86_64__)
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uintptr_t hint = 0x4f0000000000ULL;
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const uintptr_t app_start = 0x600000000000ULL;
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#elif defined(__loongarch_lp64)
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uintptr_t hint = 0x4f0000000000ULL;
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const uintptr_t app_start = 0x600000000000ULL;
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#elif defined (__mips64)
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uintptr_t hint = 0x4f00000000ULL;
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const uintptr_t app_start = 0x6000000000ULL;
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#elif defined (__powerpc64__)
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uintptr_t hint = 0x2f0000000000ULL;
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const uintptr_t app_start = 0x300000000000ULL;
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#elif defined(__s390x__)
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uintptr_t hint = 0x07f000000000ULL;
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const uintptr_t app_start = 0x020000000000ULL;
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#elif defined (__aarch64__)
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uintptr_t hint = 0X0110000000000;
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// Unfortunately we don't have a stronger condition for this
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const uintptr_t app_start = 0x0ULL;
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#endif
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uintptr_t p = (uintptr_t)mmap(
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(void *)hint, 4096, PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | (FIXED ? MAP_FIXED : 0), -1, 0);
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if (FIXED)
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assert(p == (uintptr_t)-1 && errno == EINVAL);
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else
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assert(p >= app_start);
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return 0;
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}
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