In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Don’t resurrect a scalar id dropped by collect_linked_regs()<\/p>\n
check_cond_jmp_op() copies the compared registers into
\nenv->{false,true}_reg{1,2} before collect_linked_regs() runs and copies
\nthose snapshots back into both branch states afterwards.<\/p>\n
collect_linked_regs() records at most LINKED_REGS_MAX members of a
\nlinked registers group in the jump history and calls clear_scalar_id()
\nfor every member that does not fit. The compared register is not exempt
\nfrom that.<\/p>\n
As a consequence, sync_linked_regs() might adjust ranges for more
\nregisters than bpf_bt_sync_linked_regs() can propagate precision to.<\/p>\n
Collect the linked registers before the snapshots are taken instead.
\nThis might lead to some unnecessary clear_scalar_id’s, but from
\nprevious testing situations with many linked registers are
\nextremely rare.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Don’t resurrect a scalar id dropped by collect_linked_regs()<\/p>\n
check_cond_jmp_op() copies the compared registers into
\nenv->{fal<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29197","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29197","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=29197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}