In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf, riscv: Fix extable handling for arena load_acquire<\/p>\n
emit_atomic_ld_st() returns 1 to have build_body() skip the zext after
\na sub-word load_acquire. The caller does “ret = ret ?:
\nadd_exception_handler(…)”, which skips add_exception_handler() on any
\nnon-zero ret, so the extable entry is missing and a faulting
\nPROBE_ATOMIC load_acquire oopses.<\/p>\n
REG_DONT_CLEAR_MARKER leaves rd stale on fault, and the verifier still
\nthinks the load overwrote it, so a program can leak it through a map.<\/p>\n
Check ret >= 0 before calling add_exception_handler(), and pass rd for
\nLOAD_ACQ so the fault zeroes rd like a PROBE_MEM load. Return ret
\nunchanged for the zext skip.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf, riscv: Fix extable handling for arena load_acquire<\/p>\n
emit_atomic_ld_st() returns 1 to have build_body() skip the zext after
\na s<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25886","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25886","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=25886"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25886"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25886"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}