In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/vfio_ccw: Fix out of bounds check on CCW array<\/p>\n
The routine ccwchain_calc_length() counts the number of channel
\ncommand words (CCWs) that are chained together in a single channel
\nprogram, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs.<\/p>\n
The loop itself is “do..while (count < 257)", and while the logic in
\nis_cpa_within_range() correctly adjusts between the 0-index array of
\nCCWs and the count of CCWs starting at 1, this means it would look
\nat a possible 257th CCW before ending the loop and (correctly)
\nreturning an error.<\/p>\n
Fix this by restructuring the loop to break as soon as 256 CCWs
\n(thus indexes 0-255) are examined, without looking at memory
\noutside the range.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/vfio_ccw: Fix out of bounds check on CCW array<\/p>\n
The routine ccwchain_calc_length() counts the number of channel
\ncommand words <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11955","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11955","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=11955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}