In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ext4: fix out-of-bounds read in ext4_read_inline_dir()<\/p>\n
ext4_read_inline_dir() can read a dirent header past the end of its inline
\nbuffer, triggering a slab-out-of-bounds read during getdents64():<\/p>\n
BUG: KASAN: slab-out-of-bounds in __ext4_check_dir_entry
\n Read of size 2 at addr ffff88800f3dd23c by task exploit\/148
\n …
\n __ext4_check_dir_entry
\n ext4_read_inline_dir
\n iterate_dir<\/p>\n
The dirent payload lives in a buffer of exactly inline_size bytes:<\/p>\n
\tdir_buf = kmalloc(inline_size, GFP_NOFS);<\/p>\n
but iteration runs in a position space extra_offset bytes larger
\n(extra_size = extra_offset + inline_size) so the synthetic “.” and “..”
\nland at their block-dir offsets. A dirent is formed at “dir_buf + pos –
\nextra_offset”, yet the ext4_check_dir_entry() length argument uses the
\nlarger extra_size. A position whose dirent header would extend past
\nextra_size is therefore accepted, and the rescan loop’s rec_len probe and
\next4_check_dir_entry() dereference de->rec_len before the entry is rejected.<\/p>\n
Reject a position whose minimum-size dirent header would not fit within
\nextra_size before forming de, in both the rescan and main loops, and pass
\ninline_size rather than extra_size to ext4_check_dir_entry() so the length
\ncheck matches the physical buffer.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ext4: fix out-of-bounds read in ext4_read_inline_dir()<\/p>\n
ext4_read_inline_dir() can read a dirent header past the end of its inline<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24443","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24443","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=24443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24443"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}