In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
fs\/ntfs3: bound attr_off in UpdateResidentValue against data_off<\/p>\n
In do_action()’s UpdateResidentValue case (fslog.c:3307),
\nlrh->attr_off and lrh->redo_len come from the on-disk LRH.
\nWhen they satisfy aoff + dlen res.data_off, the
\nassignment<\/p>\n
\tattr->res.data_size = cpu_to_le32(aoff + dlen – data_off);<\/p>\n
underflows to ~4 GiB (e.g. 0xFFFFFFF9 when aoff=0x10, dlen=1,
\ndata_off=0x18). Subsequent code that reads attr->res.data_size
\nto walk the resident attribute payload would then read up to
\n4 GiB past the 1024-byte MFT record allocation.<\/p>\n
The existing mi_enum_attr() defense in fs\/ntfs3\/record.c:287
\ncatches the corrupted data_size on the next attribute walk
\nand fails the mount, but only on the path that walks all
\nattributes. A read site that picks an attribute by name and
\nreads its data_size without re-validating is not covered.
\nValidate aoff against data_off and asize at the source.<\/p>\n
Reproduced under UML+KASAN on mainline 8d90b09e6741 via
\npr_warn-only probe: with aoff=0x10 and data_off=0x18, the
\npost-assignment data_size is 0xfffffff9 (mount then fails
\nat -22 from mi_enum_attr).<\/p>\n
[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
fs\/ntfs3: bound attr_off in UpdateResidentValue against data_off<\/p>\n
In do_action()’s UpdateResidentValue case (fslog.c:3307),
\nlrh->at<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-6826","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/6826","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=6826"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6826"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}