In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/vfio-ap: fix potential use of uninitialized apm_filtered bitmap<\/p>\n
The DECLARE_BITMAP(apm_filtered, AP_DEVICES) macro allocates the bitmap
\non the stack without zero-initializing it.<\/p>\n
In vfio_ap_mdev_hot_plug_cfg(), the vfio_ap_mdev_filter_matrix() function
\nis only called to initialize and populate apm_filtered if either
\nfilter_adapters or filter_domains is true. If the hot plug configuration
\nchange only adds control domains (meaning filter_cdoms is true, but
\nfilter_adapters and filter_domains are both false),
\nvfio_ap_mdev_filter_matrix() is bypassed.<\/p>\n
Consequently, apm_filtered is passed to reset_queues_for_apids() with
\nuninitialized stack garbage. This can cause reset_queues_for_apids() to
\ninterpret arbitrary stack garbage bits as valid APIDs to reset, potentially
\nperforming unintended guest hardware queue resets.<\/p>\n
Fix this by zero-initializing the apm_filtered bitmap at the beginning of
\nvfio_ap_mdev_hot_plug_cfg() using bitmap_zero().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/vfio-ap: fix potential use of uninitialized apm_filtered bitmap<\/p>\n
The DECLARE_BITMAP(apm_filtered, AP_DEVICES) macro allocates <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28502","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28502","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=28502"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28502"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28502"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}