π Fix integer overflow in calloc#33
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Adds a check in `kernel/libc.in` for the `calloc` function to ensure that integer overflow does not happen during the multiplication of `n` and `size`. If `n != 0` and `total / n != size`, the check will trigger an `assert`, halting execution and preventing a smaller buffer allocation than expected, avoiding potential memory corruption. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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π― What: The vulnerability fixed is an integer overflow in
callocwithinkernel/libc.in. The productn * sizecould overflow when the arguments are large, resulting in a buffer allocation that is smaller than the requested size.π‘οΈ Solution: Modified
callocto verify thatn != 0and then assert that(total / n) == size. If an integer overflow occurs during the multiplication, this check catches it andassertprevents further execution, effectively mitigating the vulnerability.PR created automatically by Jules for task 663093201888592636 started by @undivisible