In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
firmware_loader: do not queue completed sysfs fallback requests<\/p>\n
fw_load_sysfs_fallback() calls device_add() before adding the fw_priv to
\npending_fw_head. device_add() publishes the fallback loading interface, so
\na userspace helper which discovers the device by scanning sysfs can write 0
\nto the loading attribute and complete the request before it is queued as
\npending.<\/p>\n
In that interleaving firmware_loading_store() calls fw_state_done() while
\npending_list still points to itself, so it cannot remove an entry from
\npending_fw_head. The subsequent unconditional list_add() then queues an
\nalready-completed fw_priv. Once the request is released, pending_fw_head
\ncan retain a pointer to freed memory and the next fallback request can
\nfault while validating the list.<\/p>\n
Only in-flight fallback requests need suspend or reboot abort handling. If
\nthe request is already DONE after device_add(), return success from the
\nfallback path without sending another uevent, waiting again, or queueing it
\nas pending. This preserves the invariant that pending_fw_head contains only
\nactive fallback requests.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
firmware_loader: do not queue completed sysfs fallback requests<\/p>\n
fw_load_sysfs_fallback() calls device_add() before adding the fw_p<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25693","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25693","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=25693"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25693"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25693"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}