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io_async_cancel_prep() reads the opcode selector from sqe->len and stores it in cancel->opcode, which is an 8-bit field. Since sqe->len is a 32-bit value, values larger than U8_MAX are implicitly truncated. This can cause unintended opcode matches when the truncated value corresponds to a valid io_uring opcode. For example, submitting a value such as 0x10b will be truncated to 0x0b (IORING_OP_TIMEOUT), allowing a cancel request to match operations it did not intend to target. Validate the opcode value before assigning it to the 8-bit field and reject values outside the valid io_uring opcode range. Signed-off-by: Amir Mohammad Jahangirzad <a.jahangirzad@gmail.com> Link: https://patch.msgid.link/20260331232113.615972-1-a.jahangirzad@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
667 lines
16 KiB
667 lines
16 KiB