Description

In the Linux kernel, the following vulnerability has been resolved: RDMA: During rereg_mr ensure that REREG_ACCESS is compatible If IB_MR_REREG_ACCESS changes from RO to RW then the umem has to be re-evaluated to ensure it is properly pinned as RW. Since the umem is hidden inside each driver's mr struct add a ib_umem_check_rereg() function that each driver has to call before processing IB_MR_REREG_ACCESS. mlx4 has to retain its duplicate ib_access_writable check because it implements IB_MR_REREG_ACCESS | IB_MR_REREG_TRANS by changing both items in place sequentially while the MR is live, so it will continue to not support this combination.

References 5

• git.kernel.org https://git.kernel.org/stable/c/09dc18894148381d3bfc550083b1236043870dce
• git.kernel.org https://git.kernel.org/stable/c/2904e985a2917b5dac65df82733065e78a65fc9d
• git.kernel.org https://git.kernel.org/stable/c/50334a05a950840b39a1ce3d2a173b4183db9b3e
• git.kernel.org https://git.kernel.org/stable/c/badad6fad60def1b9805559dd81dbab3d97b82aa
• git.kernel.org https://git.kernel.org/stable/c/eba5df21eda0fe7418efbea2f799f8ea1b8ca94c

Remediation