In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
futex\/pi: Reject cross-mm private futex owners<\/p>\n
A private futex key borrows the waiter’s mm without taking an mm_users
\nreference. Nevertheless, attach_to_pi_owner() currently accepts an owner
\nfrom a different address space and copies the private key into the owner’s
\nPI state.<\/p>\n
When that owner exits, exit_pi_state_list() uses the saved key to find the
\nhash bucket and acquires a reference to the waiter’s private hash. If the
\nlast user of the waiter’s mm exits concurrently, futex_hash_free() frees
\nthe hash while the owner still uses its bucket and reference.<\/p>\n
Prevent this by validating in attach_to_pi_owner() that, for private
\nfutexes, the owner mm and waiter mm are the same. Perform the check with
\nthe owner’s pi_lock held and after validating owner::futex::state to
\nserialize against a concurrent PI-state exit cleanup.<\/p>\n
[ tglx: Amended comment ]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
futex\/pi: Reject cross-mm private futex owners<\/p>\n
A private futex key borrows the waiter’s mm without taking an mm_users
\nreference. N<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17282","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17282","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=17282"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17282"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}