In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
fs\/ntfs3: validate index entry key bounds<\/p>\n
[BUG]
\nA malformed NTFS directory index entry can advertise a key_size larger
\nthan the bytes actually present in its NTFS_DE payload. Directory lookup
\nthen passes that malformed key to cmp_fnames(), which can read past the
\nend of the kmalloc’ed index buffer.<\/p>\n
BUG: KASAN: slab-out-of-bounds in fname_full_size fs\/ntfs3\/ntfs.h:590 [inline]
\nBUG: KASAN: slab-out-of-bounds in cmp_fnames+0x1ea\/0x230 fs\/ntfs3\/index.c:46
\nRead of size 1 at addr ffff88801c313018 by task syz.6.3365\/9279<\/p>\n
Call Trace:
\n __dump_stack lib\/dump_stack.c:94 [inline]
\n dump_stack_lvl+0xbe\/0x130 lib\/dump_stack.c:120
\n print_address_description mm\/kasan\/report.c:378 [inline]
\n print_report+0xd1\/0x650 mm\/kasan\/report.c:482
\n kasan_report+0xfb\/0x140 mm\/kasan\/report.c:595
\n __asan_report_load1_noabort+0x14\/0x30 mm\/kasan\/report_generic.c:378
\n fname_full_size fs\/ntfs3\/ntfs.h:590 [inline]
\n cmp_fnames+0x1ea\/0x230 fs\/ntfs3\/index.c:46
\n hdr_find_e.isra.0+0x3ed\/0x670 fs\/ntfs3\/index.c:762
\n indx_find+0x4b5\/0x900 fs\/ntfs3\/index.c:1186
\n dir_search_u+0x2c0\/0x460 fs\/ntfs3\/dir.c:254
\n ntfs_lookup+0x1cc\/0x2a0 fs\/ntfs3\/namei.c:85
\n __lookup_slow+0x241\/0x450 fs\/namei.c:1816
\n lookup_slow fs\/namei.c:1833 [inline]
\n walk_component+0x31c\/0x570 fs\/namei.c:2151
\n link_path_walk+0x592\/0xd60 fs\/namei.c:2519
\n path_lookupat+0x138\/0x660 fs\/namei.c:2675
\n filename_lookup+0x1f3\/0x560 fs\/namei.c:2705
\n filename_setxattr+0xad\/0x1c0 fs\/xattr.c:660
\n path_setxattrat+0x1d8\/0x280 fs\/xattr.c:713
\n __do_sys_lsetxattr fs\/xattr.c:754 [inline]
\n __se_sys_lsetxattr fs\/xattr.c:750 [inline]
\n __x64_sys_lsetxattr+0xd0\/0x150 fs\/xattr.c:750
\n …<\/p>\n
Allocated by task 9279:
\n kasan_save_stack+0x39\/0x70 mm\/kasan\/common.c:56
\n kasan_save_track+0x14\/0x40 mm\/kasan\/common.c:77
\n kasan_save_alloc_info+0x37\/0x60 mm\/kasan\/generic.c:573
\n poison_kmalloc_redzone mm\/kasan\/common.c:400 [inline]
\n __kasan_kmalloc+0xc3\/0xd0 mm\/kasan\/common.c:417
\n kasan_kmalloc include\/linux\/kasan.h:262 [inline]
\n __do_kmalloc_node mm\/slub.c:5650 [inline]
\n __kmalloc_noprof+0x2bd\/0x900 mm\/slub.c:5662
\n kmalloc_noprof include\/linux\/slab.h:961 [inline]
\n indx_read+0x41d\/0xad0 fs\/ntfs3\/index.c:1059
\n indx_find+0x447\/0x900 fs\/ntfs3\/index.c:1179
\n dir_search_u+0x2c0\/0x460 fs\/ntfs3\/dir.c:254
\n ntfs_lookup+0x1cc\/0x2a0 fs\/ntfs3\/namei.c:85
\n __lookup_slow+0x241\/0x450 fs\/namei.c:1816
\n lookup_slow fs\/namei.c:1833 [inline]
\n walk_component+0x31c\/0x570 fs\/namei.c:2151
\n link_path_walk+0x592\/0xd60 fs\/namei.c:2519
\n path_lookupat+0x138\/0x660 fs\/namei.c:2675
\n filename_lookup+0x1f3\/0x560 fs\/namei.c:2705
\n filename_setxattr+0xad\/0x1c0 fs\/xattr.c:660
\n path_setxattrat+0x1d8\/0x280 fs\/xattr.c:713
\n __do_sys_lsetxattr fs\/xattr.c:754 [inline]
\n __se_sys_lsetxattr fs\/xattr.c:750 [inline]
\n __x64_sys_lsetxattr+0xd0\/0x150 fs\/xattr.c:750
\n …<\/p>\n
[CAUSE]
\nThe index-header validators only validated INDEX_HDR-level geometry.
\nThey did not walk each NTFS_DE to verify entry alignment, subnode
\nlayout, or that key_size fit inside the entry payload. They also
\nallowed a last sentinel entry to carry a non-zero key_size.<\/p>\n
[FIX]
\nWalk every NTFS_DE in ntfs3’s index-header validators and reject
\nentries with invalid layout, mismatched subnode state, oversized
\nkey_size, or non-zero sentinel keys before lookup or log replay can
\nconsume them.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
fs\/ntfs3: validate index entry key bounds<\/p>\n
[BUG]
\nA malformed NTFS directory index entry can advertise a key_size larger
\nthan the by<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28685","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28685","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=28685"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28685"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}