linux-kernel - Re: KASAN: null-ptr-deref Read in xattr

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Message-Id: <201804110600.CCF73450.FFOOQtSFOLHMVJ@I-love.SAKURA.ne.jp>
Date:   Wed, 11 Apr 2018 06:00:44 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     ebiederm@...ssion.com
Cc:     syzbot+9369930ca44f29e60e2d@...kaller.appspotmail.com,
        serge@...lyn.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk, linux-security-module@...r.kernel.org
Subject: Re: KASAN: null-ptr-deref Read in xattr_getsecurity

Eric W. Biederman wrote:
> Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> writes:
> 
> > From 904d07a6eb014f3df0c5a1ebfcfd4323276a9a76 Mon Sep 17 00:00:00 2001
> > From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> > Date: Tue, 10 Apr 2018 15:15:16 +0900
> > Subject: [PATCH] commoncap: Handle memory allocation failure.
> >
> > syzbot is reporting NULL pointer dereference at xattr_getsecurity() [1],
> > for cap_inode_getsecurity() is returning sizeof(struct vfs_cap_data) when
> > memory allocation failed. Return -ENOMEM if memory allocation failed.
> >
> > [1] https://syzkaller.appspot.com/bug?id=a55ba438506fe68649a5f50d2d82d56b365e0107
> 
> Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> 
> Tetsuo I can pick this up, or do you have preferred path for getting
> this change merged?

I don't have preferred path. You can pick this up. Thanks.