In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs: bound $AttrDef table walk to the loaded table size<\/p>\n
ntfs_attr_find_in_attrdef() walks the in-memory $AttrDef table, but the
\nloop condition bounds only the start of each entry, not the whole entry:<\/p>\n
\tfor (ad = vol->attrdef; (u8 *)ad – (u8 *)vol->attrdef attrdef_size && ad->type; ++ad)<\/p>\n
struct attr_def is 160 bytes; the guard reads ad->type at offset 128 and
\nthe loop body reads further fields. vol->attrdef is kvzalloc(i_size),
\nwhere i_size is the on-disk $AttrDef data size, checked in
\nload_and_init_attrdef() only as 0 < i_size type run past the allocation. Creating a file reaches this
\nthrough ntfs_attr_size_bounds_check() and reads out of bounds:<\/p>\n
BUG: KASAN: slab-out-of-bounds in ntfs_attr_find_in_attrdef+0x66\/0xa0
\n Read of size 4 at addr ffff888005833280 by task init\/1
\n ntfs_attr_find_in_attrdef
\n ntfs_attr_size_bounds_check
\n ntfs_attr_can_be_non_resident
\n ntfs_attr_add<\/p>\n
Require the whole entry to lie within attrdef_size in the loop guard, and
\nreject at mount a $AttrDef too small to hold one attr_def entry.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs: bound $AttrDef table walk to the loaded table size<\/p>\n
ntfs_attr_find_in_attrdef() walks the in-memory $AttrDef table, but the
\nl<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29290","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29290","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=29290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}