In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Take mmap_lock in zap_pages()<\/p>\n
zap_vma_range() requires the owning mm’s mmap_lock to be held.<\/p>\n
Taking mmap_read_lock under arena->lock would AB-BA against
\narena_vm_close() and arena_map_mmap(), both of which run with
\nmmap_write_lock held and then acquire arena->lock. Instead drop
\narena->lock, mmget_not_zero() the vma’s mm, take mmap_read_lock, and
\nre-resolve the vma via find_vma() since it may have been unmapped or
\nreplaced while waiting.<\/p>\n
Track processed vmls with a per-call generation in vml->zap_gen and
\nserialize zap_pages() callers with a new arena->zap_mutex so
\nconcurrent callers on different uaddr ranges do not mark each other’s
\nvmls processed before the zap is done.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Take mmap_lock in zap_pages()<\/p>\n
zap_vma_range() requires the owning mm’s mmap_lock to be held.<\/p>\n
Taking mmap_read_lock under are<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7302","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7302","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=7302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}