In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
LoongArch: BPF: Move arena register slot below TCC context<\/p>\n
Currently, the stack layout places the optional arena register slot
\nabove the tail call counter context. When arena_vm_start is dynamically
\nenabled, it shifts the relative offset of the tcc_ptr slot within the
\nstack frame, causing hardcoded tracking macros to mismatch and leading
\nto memory misalignment or corruption potentially.<\/p>\n
To fix this, move the arena register save and restore sequences below
\nthe tail call counter context slots in both build_prologue() and the
\nepilogue.<\/p>\n
Update __build_epilogue() to insert a proper offset decrement to safely
\nskip the unneeded tcc_ptr reading block while accurately aligning with
\nthe relocated arena slot at the very bottom.<\/p>\n
With this patch, the tcc_ptr slot is always positioned at a fixed
\ndistance directly underneath the base callee-saved registers that is
\nindependent of whether the arena features are on.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
LoongArch: BPF: Move arena register slot below TCC context<\/p>\n
Currently, the stack layout places the optional arena register slot
\nabo<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24592","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24592","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=24592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}