linux-kernel - Re: [PATCH] keyring: Incorrect permissions checking in __keyring_search

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] [day] [month] [year] [list]

Date:	Mon, 10 Mar 2008 12:25:21 +0000
From:	David Howells <dhowells@...hat.com>
To:	Arun Raghavan <arunsr@....iitk.ac.in>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	satyam@...radead.org
Subject: Re: [PATCH] keyring: Incorrect permissions checking in __keyring_search_one()

Arun Raghavan <arunsr@....iitk.ac.in> wrote:

> The __keyring_search_one() function currently has 2 issues with regards
> to permissions:
> 
>  1. It does not check for KEY_SEARCH on the keyring before performing a
>     search

That is correct.  This is used by key_create_or_update() to check to see
whether there's a key in the current keyring that it can update rather than
adding a new key entirely.  key_create_or_update() mustn't be bound by
KEY_SEARCH permission, and similarly the target key doesn't require KEY_SEARCH
permission either; the control here is whether or not the target key has
KEY_WRITE permission.

>  2. It accepts a "perm" parameter to check whether a given key in the
>     keyring may be returned.

The "perm" parameter is superfluous given that nothing else now calls this
function.

David
--
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/