In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: devmem: reject dma-buf bind with non-page-aligned size or SG length<\/p>\n
net_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_len() to be
\nPAGE_SIZE multiples without checking:<\/p>\n
– tx_vec is sized dmabuf->size \/ PAGE_SIZE, and
\n net_devmem_get_niov_at() only bounds-checks virt_addr size
\n before indexing tx_vec[virt_addr \/ PAGE_SIZE]. With size =
\n N*PAGE_SIZE + r (1 <= r area.num_niovs = len \/ PAGE_SIZE while gen_pool_add_owner()
\n covers the full byte len, so a non-page-multiple non-final sg
\n desyncs num_niovs from the gen_pool region for every later sg, on
\n both RX and TX.<\/p>\n
dma-buf does not require page-aligned sizes, so the bind path has to
\nenforce what its own indexing assumes. Reject both with -EINVAL.<\/p>\n
The size check is TX-only (only tx_vec is sized off dmabuf->size); the
\nSG-length check covers both directions.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: devmem: reject dma-buf bind with non-page-aligned size or SG length<\/p>\n
net_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_l<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15091","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15091","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=15091"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15091"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}