Description

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix slab-out-of-bounds read in hdr_delete_de() Here is a BUG report from syzbot: BUG: KASAN: slab-out-of-bounds in hdr_delete_de+0xe0/0x150 fs/ntfs3/index.c:806 Read of size 16842960 at addr ffff888079cc0600 by task syz-executor934/3631 Call Trace: memmove+0x25/0x60 mm/kasan/shadow.c:54 hdr_delete_de+0xe0/0x150 fs/ntfs3/index.c:806 indx_delete_entry+0x74f/0x3670 fs/ntfs3/index.c:2193 ni_remove_name+0x27a/0x980 fs/ntfs3/frecord.c:2910 ntfs_unlink_inode+0x3d4/0x720 fs/ntfs3/inode.c:1712 ntfs_rename+0x41a/0xcb0 fs/ntfs3/namei.c:276 Before using the meta-data in struct INDEX_HDR, we need to check index header valid or not. Otherwise, the corruptedi (or malicious) fs image can cause out-of-bounds access which could make kernel panic.

References 5

• git.kernel.org https://git.kernel.org/stable/c/114204d25e1dffdd3a0c1cfbba219afd344f4b4f
• git.kernel.org https://git.kernel.org/stable/c/4a034ece7e2877673d9085d6e7ed45e6ee40b761
• git.kernel.org https://git.kernel.org/stable/c/9163a5b4ed290da4a7d23fa92533e0e81fd0166e
• git.kernel.org https://git.kernel.org/stable/c/ab84eee4c7ab929996602eda7832854c35a6dda2
• git.kernel.org https://git.kernel.org/stable/c/c58ea97aa94f033ee64a8cb6587d84a9849b6216

Remediation