In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
iommu\/amd: Fix ineffective error check in nested domain allocation<\/p>\n
amd_iommu_pdom_id_alloc() returns an int: a domain ID on success, or the
\nnegative errno from ida_alloc_range() when the ID space is exhausted or
\nmemory is short. amd_iommu_alloc_domain_nested() stores that return value
\nin gdom_info->hdom_id, which is a u32, and only then tests it:<\/p>\n
\tgdom_info->hdom_id = amd_iommu_pdom_id_alloc();
\n\tif (gdom_info->hdom_id <= 0) {<\/p>\n
The assignment discards the sign, so -ENOSPC becomes 0xffffffe4 and the
\ntest never fires. The nested domain is then set up with a host domain ID
\nthat was never allocated, instead of the allocation failing with -ENOSPC.<\/p>\n
Keep the value in an int, test it there, and store it only once it is
\nknown to be valid, which is what the other amd_iommu_pdom_id_alloc()
\ncallers already do.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
iommu\/amd: Fix ineffective error check in nested domain allocation<\/p>\n
amd_iommu_pdom_id_alloc() returns an int: a domain ID on succes<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29157","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29157","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=29157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}