In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Fix overflow of jump offset in constant blinding<\/p>\n
bpf_jit_blind_insn() rewrites ‘if rX op imm goto off’ into:<\/p>\n
AX = imm ^ rnd
\n AX ^= rnd
\n if rX op AX goto off<\/p>\n
and subtracts 2 from off when the jump is backward. off is s16, so
\n-32767 and -32768 wrap and the jump goes 32767 insns forward, past the
\nend of the prog. The jump is inside the patch, hence bpf_adj_branches()
\ndoesn’t check it. The kernel crashes when such prog runs with
\nbpf_jit_harden=2.<\/p>\n
Return -ERANGE in such case. bpf_jit_blind_constants() fails the same
\nway when blinding of other insns moves a jump out of range.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Fix overflow of jump offset in constant blinding<\/p>\n
bpf_jit_blind_insn() rewrites ‘if rX op imm goto off’ into:<\/p>\n
AX = imm ^ rn<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41288","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41288","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=41288"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41288"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}