Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ca1c857e2bb74a9fc0606128334f85316d57067b; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b870f652877bfbe321bd0f4096fc37a93296f7b6; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ce57fa439bd1b5d664f334a0c3e3f0e42abb0153; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fd19eb1c75047a4ed4e855f56cafd704dc3914e0; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fe31722b0194ff76bf8b461e8bf97a2081147787; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c1c2417c60dbdca5ebb00462f21ee71c2d7f7083; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9e8f6c9d4ecddda2f28baa1678340286cff3969c; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9aad71144fa3682cca3837a06c8623016790e7ec |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.86 through 6.12.*; unaffected 6.18.27 through 6.18.*; unaffected 7.0.4 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.