In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
f2fs: avoid NULL checkpoint thread access in sysfs<\/p>\n
checkpoint_merge can be enabled even when no checkpoint merge thread is
\nrunning. A read-only mount is one case: f2fs does not start
\nf2fs_issue_ckpt there, but ckpt_thread_ioprio is still writable through
\nsysfs.<\/p>\n
The ckpt_thread_ioprio store path updates the saved ioprio value and,
\nwhen checkpoint_merge is enabled, calls set_task_ioprio() for the
\ncheckpoint thread. If cprc->f2fs_issue_ckpt is NULL, that dereferences a
\nNULL task pointer.<\/p>\n
Protect ckpt_thread_ioprio sysfs writes with s_umount as well, so the
\ncheckpoint thread cannot disappear under the store path while updating
\nits ioprio.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
f2fs: avoid NULL checkpoint thread access in sysfs<\/p>\n
checkpoint_merge can be enabled even when no checkpoint merge thread is
\nrunning<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24522","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24522","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=24522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}