In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: skmsg: preserve sg.copy across SG transforms<\/p>\n
The sk_msg sg.copy bitmap is part of the scatterlist entry ownership
\nstate. A set bit tells sk_msg_compute_data_pointers() not to expose the
\nentry through writable BPF ctx->data. This protects entries backed by
\npages that are not private to the sk_msg, such as splice-backed file
\npage-cache pages.<\/p>\n
Several sk_msg transform paths move, copy, split, or compact
\nmsg->sg.data[] entries without moving the matching sg.copy bit. This can
\nmake an externally backed entry arrive at a new slot with a clear copy
\nbit. A later SK_MSG verdict can then expose sg_virt(sge) as writable
\nctx->data and BPF stores can modify the original page cache.<\/p>\n
Keep sg.copy synchronized with sg.data[] whenever entries are
\ntransferred, shifted, split, or copied into a new sk_msg. Clear the bit
\nwhen an entry is replaced by a newly allocated private page or freed.
\nThis covers the BPF pull\/push\/pop helpers, sk_msg_shift_left\/right(),
\nsk_msg_xfer(), and tls_split_open_record(), including the partial tail
\nentry created during TLS open-record splitting.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: skmsg: preserve sg.copy across SG transforms<\/p>\n
The sk_msg sg.copy bitmap is part of the scatterlist entry ownership
\nstate. A se<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14901","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14901","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=14901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}