Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp rxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the IB_QP_STATE path, so it holds no state_lock and runs while the responder task rxe_receiver() (recv_task on rxe_wq) is live. A modify_qp() setting only that attribute calls free_rd_atomic_resources() then alloc_rd_atomic_resources(), swapping qp->resp.resources[] while rxe_prepare_res()/find_resource() walk it; free_rd_atomic_resources() also leaves the cached pointer qp->resp.res dangling. A local unprivileged user can race the free/realloc into a use-after-free in rxe_receiver() (local DoS). Drain recv_task around the swap with rxe_disable_task()/rxe_enable_task(), as rxe_qp_reset() already does when tearing this array down, re-enabling only after alloc_rd_atomic_resources() succeeds so the responder never resumes against a NULL qp->resp.resources on the ENOMEM path. Also clear qp->resp.res in free_rd_atomic_resources(), like the rxe_resp.c completion paths. Reproduced under KASAN; the slab-use-after-free in rxe_receiver() is gone.
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
8700e3e7c4857d28ebaa824509934556da0b3e76 to < 82257379061c0a7aba6c77081d988339982af115affected8700e3e7c4857d28ebaa824509934556da0b3e76 to < 0136b528b753c5a56e4d997ef20b86bb6750b8fbaffected8700e3e7c4857d28ebaa824509934556da0b3e76 to < ffa4f0be69656be1755090f02db38d49816585c6affected8700e3e7c4857d28ebaa824509934556da0b3e76 to < d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844affected8700e3e7c4857d28ebaa824509934556da0b3e76 to < 60dfd47929cd1e7070daa810d40ce538d888410daffected8700e3e7c4857d28ebaa824509934556da0b3e76 to < 6f7014237405e7f032b5c53a82d9eccf6161c291affected
Linux Linux
Default version status: affected
4.8affected0 to < 4.8unaffected6.6.160 to ≤ 6.6.*unaffected6.12.108 to ≤ 6.12.*unaffected6.18.49 to ≤ 6.18.*unaffected7.1.13 to ≤ 7.1.*unaffected7.2.3 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/82257379061c0a7aba6c77081d988339982af115 ↗
- https://git.kernel.org/stable/c/0136b528b753c5a56e4d997ef20b86bb6750b8fb ↗
- https://git.kernel.org/stable/c/ffa4f0be69656be1755090f02db38d49816585c6 ↗
- https://git.kernel.org/stable/c/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844 ↗
- https://git.kernel.org/stable/c/60dfd47929cd1e7070daa810d40ce538d888410d ↗
- https://git.kernel.org/stable/c/6f7014237405e7f032b5c53a82d9eccf6161c291 ↗