linux-kernel - Slab out of bounds in setxattr

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAB+yDaZAwFny2NdOZfymdpdR3Sf7pdkxahgQ6v2zBzUvSwBWTA@mail.gmail.com>
Date:   Fri, 1 Jun 2018 13:52:14 -0700
From:   shankarapailoor <shankarapailoor@...il.com>
To:     shaggy@...nel.org
Cc:     jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Slab out of bounds in setxattr

Hi Dave et al,

I have been fuzzing linux 4.17-rc4 with JFS using Syzkaller  KASAN:
slab-out-of-bounds in jfs_xattr.

Attached are my kernel configs and a C reproducer. In the first
setxattr call it appears that length is much larger than the name. In
__jfs_setxattr, I don't see where the length is checked against the
actual value length.

Regards,
Shankara Pailoor

Download attachment "jfskernelconfigs" of type "application/octet-stream" (123917 bytes)

View attachment "setxattrbug.c" of type "text/x-csrc" (1326 bytes)