In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/msm: RCU-free the scheduler-containing ring and VM objects<\/p>\n
Both struct msm_ringbuffer and struct msm_gem_vm embed a struct
\ndrm_gpu_scheduler. msm_ringbuffer_destroy() and the VM free callback
\nmsm_gem_vm_free() call drm_sched_fini() on the embedded scheduler and then
\nfree the containing object with plain kfree().<\/p>\n
drm_sched_fence_get_timeline_name() returns fence->sched->name, and the
\nscheduler fence keeps a .release callback so it is not ops-detached on
\nsignalling. A finished fence exported to userspace (the submit out-fence, or
\na VM_BIND fence, via sync_file \/ drm_syncobj) keeps pointing at the embedded
\nscheduler after the ring\/VM is freed, so a later get_timeline_name() —
\nreachable unprivileged through SYNC_IOC_FILE_INFO — dereferences freed slab
\nmemory (KASAN slab-use-after-free read).<\/p>\n
Per the dma-fence lifetime contract the exporter must keep the data backing a
\nsignalled fence alive for an RCU grace period. Free the scheduler-containing
\nobjects with kfree_rcu() instead of kfree().<\/p>\n
Patchwork: https:\/\/patchwork.freedesktop.org\/patch\/750234\/<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/msm: RCU-free the scheduler-containing ring and VM objects<\/p>\n
Both struct msm_ringbuffer and struct msm_gem_vm embed a struct
\ndrm<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33249","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33249","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=33249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}