In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
lib\/scatterlist: fix length calculations in extract_kvec_to_sg<\/p>\n
Patch series “Fix bugs in extract_iter_to_sg()”, v3.<\/p>\n
Fix bugs in the kvec and user variants of extract_iter_to_sg. This series
\nis growing due to useful remarks made by sashiko.dev.<\/p>\n
The main bugs are:
\n– The length for an sglist entry when extracting from
\n a kvec can exceed the number of bytes in the page. This
\n is obviously not intended.
\n– When extracting a user buffer the sglist is temporarily
\n used as a scratch buffer for extracted page pointers.
\n If the sglist already contains some elements this scratch
\n buffer could overlap with existing entries in the sglist.<\/p>\n
The series adds test cases to the kunit_iov_iter test that demonstrate all
\nof these bugs. Additionally, there is a memory leak fix for the test
\nitself.<\/p>\n
The bugs were orignally introduced into kernel v6.3 where the function
\nlived in fs\/netfs\/iterator.c. It was later moved to lib\/scatterlist.c in
\nv6.5. Thus the actual fix is only marked for backports to v6.5+.<\/p>\n
This patch (of 5):<\/p>\n
When extracting from a kvec to a scatterlist, do not cross page
\nboundaries. The required length was already calculated but not used as
\nintended.<\/p>\n
Adjust the copied length if the loop runs out of sglist entries without
\nextracting everything.<\/p>\n
While there, return immediately from extract_iter_to_sg if there are no
\nsglist entries at all.<\/p>\n
A subsequent commit will add kunit test cases that demonstrate that the
\npatch is necessary.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
lib\/scatterlist: fix length calculations in extract_kvec_to_sg<\/p>\n
Patch series “Fix bugs in extract_iter_to_sg()”, v3.<\/p>\n
Fix bugs in t<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15993","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15993","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=15993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}