In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
btrfs: lzo: reject inline extents without valid headers<\/p>\n
[BUG]
\nFor a crafted btrfs image, the following KASAN can be triggered when
\nreading an inline lzo compressed file extent:<\/p>\n
BUG: KASAN: slab-out-of-bounds in lzo_decompress+0x57d\/0x700
\n Read of size 4 at addr ffff888006f2e644 by task btrfs_lzo_inlin\/77<\/p>\n
Call Trace:<\/p>\n
dump_stack_lvl+0x5b\/0x70
\n print_report+0xd1\/0x610
\n kasan_report+0xe0\/0x110
\n __asan_report_load_n_noabort+0x13\/0x20
\n lzo_decompress+0x57d\/0x700
\n btrfs_decompress+0x140\/0x1c0
\n uncompress_inline+0x147\/0x1b0
\n btrfs_get_extent+0xb23\/0x10a0
\n btrfs_do_readpage.constprop.0+0x538\/0x1ac0
\n btrfs_readahead+0x32f\/0x5f0
\n read_pages+0x16f\/0x850
\n page_cache_ra_unbounded+0x296\/0x490
\n do_page_cache_ra+0xd9\/0x130
\n page_cache_sync_ra+0x3ee\/0x6f0
\n filemap_get_pages+0x306\/0x15c0
\n filemap_read+0x329\/0xd00
\n btrfs_file_read_iter+0x1f8\/0x2b0
\n vfs_read+0x4ef\/0x720
\n ksys_read+0xf8\/0x1d0
\n __x64_sys_read+0x71\/0xb0
\n x64_sys_call+0x1ab0\/0x1b70
\n do_syscall_64+0x61\/0x470
\n entry_SYSCALL_64_after_hwframe+0x4b\/0x53<\/p>\n
[CAUSE]
\nFor an inline lzo compressed file extent, there should always be one lzo
\nheader, recording the total length of the compressed data, followed by
\none segment header, recording the compressed lzo payload.<\/p>\n
But if a crafted inline lzo compressed file extent contains only an lzo
\nheader, without the segment header or payload, lzo_decompress() will
\nstill try to read the segment header, causing a read beyond the item
\nboundary.<\/p>\n
Furthermore if the inline lzo compressed file extent is the first item
\nof the leaf, it will be at the extent buffer boundary. The above
\nout-of-boundary read will go beyond the extent buffer boundary,
\ntriggering the above KASAN report.<\/p>\n
[FIX]
\nValidate the total length of the inlined lzo compressed file extent, to
\nmake sure there is at least one LZO header and one segment header, and a
\nnon-zero payload.<\/p>\n
[ Rework the commit message to remove slop ]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
btrfs: lzo: reject inline extents without valid headers<\/p>\n
[BUG]
\nFor a crafted btrfs image, the following KASAN can be triggered when<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11287","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11287","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=11287"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11287"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11287"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}