linux-kernel - Re: [PATCH] ubifs: Fix inode leak in xattr code

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 PHC
Open Source and information security mailing list archives

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

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

Date:   Wed, 17 May 2017 00:20:14 +0200
From:   Richard Weinberger <richard@....at>
To:     dedekind1@...il.com, linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
        stable@...r.kernel.org
Subject: Re: [PATCH] ubifs: Fix inode leak in xattr code

Artem,

Am 15.05.2017 um 18:05 schrieb Artem Bityutskiy:
> On Mon, 2017-05-15 at 17:22 +0200, Richard Weinberger wrote:
>> Alternatively we could add a iget_locked/drop_nlink/iput sequence to
>> ubifs_tnc_remove_ino(). But that will make unlink() much slower for
>> files
>> that contain xattrs.
> 
> At that level we'd need to do it for every xattr, even those that were
> never be accessed, which would be slow indeed.
> 
> But we really only need to check the inode cache: hey, icache, I am
> dying, and if you have any of my guys (xattrs), I want them to die with
> me. 

That turned out to be much easier than expected.
Patch ahead!

Thanks,
//richard