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| Code Block |
|---|
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size_t size = 16;
size_t alignment = 1<<12;
float *ptr;
double *ptr1;
ptr = aligned_alloc(align , size);
if(align == alignof(ptr1)) {
ptr1 = realloc(ptr, size);
}
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Implementation details
| Wiki Markup |
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This program produces the following (unexpected) output on the x86_64-redhat-linux platform that was compiled with gcc version 4.1.2. |
(ptr\[0\] is initialized to 12.5 and ptr\[1\] is initialized to 25.5) |
| Wiki Markup |
|---|
ptr\[0\] (0x2b7000000000) = 12.500000 |
ptr\[1\] (0x2b7000000004) = 25.500000 |
ptr1\[0\] (0x2b7000000000) = 12.500000 |
ptr1\[1\] (0x2b7000000008) = 0.000000 |
Risk Assessment
Improper alignment could lead to accessing arbitrary memory locations and write into it.
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