linux-kernel - Re: security_path hooks for xattr

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

Date:	Thu, 26 Jan 2012 08:04:28 -0800
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Miklos Szeredi <miklos@...redi.hu>
CC:	john.johansen@...onical.com, apparmor@...ts.ubuntu.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	draht@...e.com, LSM <linux-security-module@...r.kernel.org>
Subject: Re: security_path hooks for xattr

On 1/26/2012 4:45 AM, Miklos Szeredi wrote:
> Forwarding from an internal bug report:
>
>     "AppArmor does not mediate the xattr system calls for confined processes.
>
>     As a consequence, a confined process can cross the confinement privilege
>     boundary by reading or writing to extended attributes that the confined
>     task should not have access to. The restrictions for security and user
>     attributes read and write still apply according to DAC; however, this
>     does not comply with the claim of AppArmor to mediate fipe
>     operations. The use of extended attributes is very flexible, so that the
>     effect of a missing mediation can lead to false assumptions in
>     subsequent policy decisions (eCryptfs)."
>
> AFAIU this boils down to missing security hooks in *xattr().
>
> Would it be possible to add these hooks?

Please post proposed patches to linux-security-module@...r.kernel.org


>
> Thanks,
> Miklos
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/