linux-kernel - Re: [PATCH 09/10] VFS: Remove read-only checks from dentry

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:	Tue, 07 Sep 2010 08:58:34 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	NeilBrown <neilb@...e.de>
Cc:	Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org,
	Dave Hansen <haveblue@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] VFS: Remove read-only checks from
 dentry_permission

On Mon, 2010-09-06 at 10:50 +1000, NeilBrown wrote:
> It is not sufficient to depend on the the "filesystem is readonly"
> tests in dentry_permission as it does not check if the vfsmnt is
> readonly.
> All call sites already call mnt_want_write or __mnt_is_readonly which
> includes the test on MS_RDONLY.
> 
> So remove this test from dentry_permission as it simply duplicates
> tests done elsewhere.

Yeah, I remember auditing all of the dentry_permission() callers and
moving them over to mnt_want_write() and friends as well.  I don't quite
remember why we didn't take this step back then, but it looks sane to
me.

-- Dave

--
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/