Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: reject a command chain that carries no commands A chain whose command_count is zero passes the payload length check, because struct_size(payload, data, 0) is just the header. The fill loop then does not run, so offset stays zero and the request is submitted with a zero-length buffer. On firmware without AIE2_NPU_COMMAND that ends at the opcode check, since op is still ERT_INVALID_CMD and aie2_get_chain_msg_op() answers MSG_OP_MAX_OPCODE. aie2_get_npu_chain_msg_op() answers MSG_OP_CHAIN_EXEC_NPU whatever it is given, so there the submission continues to drm_clflush_virt_range(cmd_buf, 0), which reads the byte before the buffer and faults on the vmap guard page. EXEC_CMD is reachable by any process that can open the render node. Reject the request instead.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf before ed74e8d603df457bfcf16ed4f8f1660a1525759e; affected 8ed8b02396172b137ca8c78c3cb999ddf4fb0bbf before ef6d27af71e1dc43181ec797a6aaa77c27c36786 |
| Linux / Linux | affected 7.1; unaffected 0 before 7.1; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.