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The above statement is evaluated at runtime allocating storage for {{s{}} }characters in stack memory. If a size argument supplied to VLAs is not a positive integer value of reasonable size, then the program may behave in an unexpected way. An attacker may be able to leverage this behavior to overwrite critical program data \[[Griffiths 06|http://felinemenace.org/papers/p63-0x0e_Shifting_the_Stack_Pointer.txt]\]. The programmer must ensure that size arguments to VLAs are valid and have not been corrupted as the result of an exceptional integer condition. |
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#define MAX_ARRAY 1024
void func(size_t s) {
vla[s];
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}
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if (sizes < MAX_ARRAY && size s!= 0) {
func(sizes);
} else {
/* Handle Error */
}
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