Description

In the Linux kernel, the following vulnerability has been resolved: hfs: fix OOB Read in __hfs_brec_find Syzbot reported a OOB read bug: ================================================================== BUG: KASAN: slab-out-of-bounds in hfs_strcmp+0x117/0x190 fs/hfs/string.c:84 Read of size 1 at addr ffff88807eb62c4e by task kworker/u4:1/11 CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted 6.1.0-rc6-syzkaller-00308-g644e9524388a #0 Workqueue: writeback wb_workfn (flush-7:0) Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x1f0 mm/kasan/report.c:395 kasan_report+0xcd/0x100 mm/kasan/report.c:495 hfs_strcmp+0x117/0x190 fs/hfs/string.c:84 __hfs_brec_find+0x213/0x5c0 fs/hfs/bfind.c:75 hfs_brec_find+0x276/0x520 fs/hfs/bfind.c:138 hfs_write_inode+0x34c/0xb40 fs/hfs/inode.c:462 write_inode fs/fs-writeback.c:1440 [inline] If the input inode of hfs_write_inode() is incorrect: struct inode struct hfs_inode_info struct hfs_cat_key struct hfs_name u8 len # len is greater than HFS_NAMELEN(31) which is the maximum length of an HFS filename OOB read occurred: hfs_write_inode() hfs_brec_find() __hfs_brec_find() hfs_cat_keycmp() hfs_strcmp() # OOB read occurred due to len is too large Fix this by adding a Check on len in hfs_write_inode() before calling hfs_brec_find().

References 9

• git.kernel.org https://git.kernel.org/stable/c/2344f17c0a89c181ab1a9fef57fd8c3bddfd6e30
• git.kernel.org https://git.kernel.org/stable/c/367296925c7625c3969d2a78d7a3e1dee161beb5
• git.kernel.org https://git.kernel.org/stable/c/4fd3a11804c8877ff11fec59c5c53f1635331e3e
• git.kernel.org https://git.kernel.org/stable/c/8c40f2dbae603ef0bd21e87c63f54ec59fd88256
• git.kernel.org https://git.kernel.org/stable/c/8d824e69d9f3fa3121b2dda25053bae71e2460d2
• git.kernel.org https://git.kernel.org/stable/c/90103ccb6e60aa4efe48993d23d6a528472f2233
• git.kernel.org https://git.kernel.org/stable/c/bfc9d8f27f89717431a6aecce42ae230b437433f
• git.kernel.org https://git.kernel.org/stable/c/c886c10a6eddb99923b315f42bf63f448883ef9a
• git.kernel.org https://git.kernel.org/stable/c/e9e692917c6e10a7066c7a6d092dcdc3d4e329f3

Remediation