linux-kernel - Slab out of bounds in setxattr

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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)