In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
dax\/fsdev: use __va(phys) for kaddr in direct_access<\/p>\n
Use __va(phys) instead of virt_addr + linear_offset for the kaddr
\nreturn in __fsdev_dax_direct_access(). The previous code added a
\ndevice-linear byte offset to virt_addr (which is __va of ranges[0]),
\nbut for multi-range devices with physical gaps between ranges, this
\nlinear arithmetic crosses the gap and produces a wrong kernel virtual
\naddress. Using __va(phys) where phys comes from dax_pgoff_to_phys()
\nis correct for any range layout because the direct map translates
\neach physical address independently.<\/p>\n
This leaves dev_dax->virt_addr write-only, so remove the field
\n(suggested by Dave Jiang).<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
dax\/fsdev: use __va(phys) for kaddr in direct_access<\/p>\n
Use __va(phys) instead of virt_addr + linear_offset for the kaddr
\nreturn in _<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25933","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25933","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=25933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25933"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}