Description
In the Linux kernel, the following vulnerability has been resolved: i3c: master: svc: bound IBI payload to the requested max_payload_len svc_i3c_master_handle_ibi() reads the IBI payload from the RX FIFO into the IBI slot. The loop is bounded by the hardware FIFO size (SVC_I3C_FIFO_SIZE), not by the slot size. slot->data points into the IBI pool, which i3c_generic_ibi_alloc_pool() sizes at max_payload_len per slot. svc_i3c_master_request_ibi() only rejects a max_payload_len larger than SVC_I3C_FIFO_SIZE, so a driver can request a smaller one. mctp-i3c requests 1. Each readsb() then copies the controller RXCOUNT bytes (up to 31) with no check against the slot size. A device that sends more bytes than the slot holds writes past slot->data, an out-of-bounds write into the IBI pool. Bound the loop by dev->ibi->max_payload_len and clamp each read to the space left in the slot, the same way dw-i3c does. A device can still send more than the requested payload. Flush the leftover bytes from the RX FIFO so they do not leak into the next transfer.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
dd3c52846d5954acd43f0e771689302f27dadc28 to < 7c099b0b292a68d0ef558527945dbfb756fbf893affecteddd3c52846d5954acd43f0e771689302f27dadc28 to < 7cc5ba756bc1cfffab9cb2695742f9f479dc73f7affecteddd3c52846d5954acd43f0e771689302f27dadc28 to < 35aa6730b8c5626b879a4e893fe664f59bf07d7faffecteddd3c52846d5954acd43f0e771689302f27dadc28 to < f296a0d5907bf88314dfda67245f7f69d1552470affecteddd3c52846d5954acd43f0e771689302f27dadc28 to < 5697d779577e2786ff3348ae9b77020ac0cf0aabaffecteddd3c52846d5954acd43f0e771689302f27dadc28 to < aac3c5aababc7fb69d5bf5b0cc52d308574e3a8caffecteddd3c52846d5954acd43f0e771689302f27dadc28 to < e2bda39d7f9f285ec803e200b5c1f17143d0b483affected
Linux Linux
Default version status: affected
5.12affected0 to < 5.12unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/7c099b0b292a68d0ef558527945dbfb756fbf893 ↗
- https://git.kernel.org/stable/c/7cc5ba756bc1cfffab9cb2695742f9f479dc73f7 ↗
- https://git.kernel.org/stable/c/35aa6730b8c5626b879a4e893fe664f59bf07d7f ↗
- https://git.kernel.org/stable/c/f296a0d5907bf88314dfda67245f7f69d1552470 ↗
- https://git.kernel.org/stable/c/5697d779577e2786ff3348ae9b77020ac0cf0aab ↗
- https://git.kernel.org/stable/c/aac3c5aababc7fb69d5bf5b0cc52d308574e3a8c ↗
- https://git.kernel.org/stable/c/e2bda39d7f9f285ec803e200b5c1f17143d0b483 ↗