In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
RDMA\/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp<\/p>\n
rxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the
\nIB_QP_STATE path, so it holds no state_lock and runs while the responder
\ntask rxe_receiver() (recv_task on rxe_wq) is live. A modify_qp() setting
\nonly that attribute calls free_rd_atomic_resources() then
\nalloc_rd_atomic_resources(), swapping qp->resp.resources[] while
\nrxe_prepare_res()\/find_resource() walk it; free_rd_atomic_resources()
\nalso leaves the cached pointer qp->resp.res dangling. A local
\nunprivileged user can race the free\/realloc into a use-after-free in
\nrxe_receiver() (local DoS).<\/p>\n
Drain recv_task around the swap with rxe_disable_task()\/rxe_enable_task(),
\nas rxe_qp_reset() already does when tearing this array down, re-enabling
\nonly after alloc_rd_atomic_resources() succeeds so the responder never
\nresumes against a NULL qp->resp.resources on the ENOMEM path. Also clear
\nqp->resp.res in free_rd_atomic_resources(), like the rxe_resp.c
\ncompletion paths.<\/p>\n
Reproduced under KASAN; the slab-use-after-free in rxe_receiver() is gone.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
RDMA\/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp<\/p>\n
rxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17368","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17368","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}