Description
In the Linux kernel, the following vulnerability has been resolved: ibmasm: fix heap over-read in ibmasm_send_i2o_message() The ibmasm_send_i2o_message() function uses get_dot_command_size() to compute the byte count for memcpy_toio(), but this value is derived from user-controlled fields in the dot_command_header (command_size: u8, data_size: u16) and is never validated against the actual allocation size. A root user can write a small buffer with inflated header fields, causing memcpy_toio() to read up to ~65 KB past the end of the allocation into adjacent kernel heap, which is then forwarded to the service processor over MMIO. Silently clamping the copy size is not sufficient: if the header fields claim a larger size than the buffer, the SP receives a dot command whose own header is inconsistent with the I2O message length, which can cause the SP to desynchronize. Reject such commands outright by returning failure. Validate command_size before calling get_mfa_inbound() to avoid leaking an I2O message frame: reading INBOUND_QUEUE_PORT dequeues a hardware frame from the controller's free pool, and returning without a corresponding set_mfa_inbound() call would permanently exhaust it. Additionally, clamp command_size to I2O_COMMAND_SIZE before the memcpy_toio() so the MMIO write stays within the I2O message frame, consistent with the clamping already performed by outgoing_message_size() for the header field.
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
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ca1c857e2bb74a9fc0606128334f85316d57067baffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b870f652877bfbe321bd0f4096fc37a93296f7b6affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ce57fa439bd1b5d664f334a0c3e3f0e42abb0153affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < fd19eb1c75047a4ed4e855f56cafd704dc3914e0affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < fe31722b0194ff76bf8b461e8bf97a2081147787affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c1c2417c60dbdca5ebb00462f21ee71c2d7f7083affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9e8f6c9d4ecddda2f28baa1678340286cff3969caffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9aad71144fa3682cca3837a06c8623016790e7ecaffected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.140 to ≤ 6.6.*unaffected6.12.86 to ≤ 6.12.*unaffected6.18.27 to ≤ 6.18.*unaffected7.0.4 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ca1c857e2bb74a9fc0606128334f85316d57067b ↗
- https://git.kernel.org/stable/c/b870f652877bfbe321bd0f4096fc37a93296f7b6 ↗
- https://git.kernel.org/stable/c/ce57fa439bd1b5d664f334a0c3e3f0e42abb0153 ↗
- https://git.kernel.org/stable/c/fd19eb1c75047a4ed4e855f56cafd704dc3914e0 ↗
- https://git.kernel.org/stable/c/fe31722b0194ff76bf8b461e8bf97a2081147787 ↗
- https://git.kernel.org/stable/c/c1c2417c60dbdca5ebb00462f21ee71c2d7f7083 ↗
- https://git.kernel.org/stable/c/9e8f6c9d4ecddda2f28baa1678340286cff3969c ↗
- https://git.kernel.org/stable/c/9aad71144fa3682cca3837a06c8623016790e7ec ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗