In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
accel\/rocket: fix UAF via dangling GEM handle in create_bo<\/p>\n
rocket_ioctl_create_bo() inserts a GEM handle into the file’s IDR via
\ndrm_gem_handle_create() early on, then performs several operations that
\ncan fail (sgt allocation, drm_mm insert, iommu_map). If any fail after
\nthe handle is live, the error path calls drm_gem_shmem_object_free()
\nwhich kfree’s the object without removing the handle from the IDR.<\/p>\n
This leaves a dangling handle pointing to freed slab memory. Any
\nsubsequent ioctl using that handle (PREP_BO, FINI_BO, SUBMIT) calls
\ndrm_gem_object_lookup() and dereferences freed memory (UAF).<\/p>\n
Fix by moving drm_gem_handle_create() to after all fallible operations
\nsucceed, matching the pattern used by panfrost, lima, and etnaviv.<\/p>\n
Also fix drm_mm_insert_node_generic() whose return value was silently
\noverwritten by iommu_map_sgtable() on the next line. Add the missing
\nerror check.<\/p>\n
[tomeu: Move handle creation to the very end]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
accel\/rocket: fix UAF via dangling GEM handle in create_bo<\/p>\n
rocket_ioctl_create_bo() inserts a GEM handle into the file’s IDR via
\nd<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15007","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15007","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=15007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}