linux-kernel - RE: [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware

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:	Fri, 24 Apr 2015 02:14:47 +0000
From:	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Peter Jones <pjones@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Ming Lei <ming.lei@...onical.com>,
	"Ong, Boon Leong" <boon.leong.ong@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Sam Protsenko <semen.protsenko@...aro.org>,
	Roy Franz <roy.franz@...aro.org>,
	"Borislav Petkov" <bp@...en8.de>
Subject: RE: [PATCH v4 2/2] efi: an sysfs interface for user to update efi
 firmware

> -----Original Message-----
> From: James Bottomley [mailto:James.Bottomley@...senPartnership.com]
> Sent: Thursday, April 23, 2015 10:10 PM
> 
> On Thu, 2015-04-23 at 08:30 +0000, Kweh, Hock Leong wrote:
> > > -----Original Message-----
> > > From: James Bottomley
> [mailto:James.Bottomley@...senPartnership.com]
> > > Sent: Wednesday, April 22, 2015 11:19 PM
> > >
> > >
> > > Yes, I think we've all agreed we can do it ... it's now a question of whether
> we
> > > can stomach the ick factor of actually initiating a transaction in close ... I'm
> still
> > > feeling queasy.
> >
> > The file "close" here can I understand that the file system will call the
> "release"
> > function at the file_operations struct?
> > http://lxr.free-electrons.com/source/include/linux/fs.h#L1538
> >
> > So, James you are meaning that we could initiating the update transaction
> > inside the f_ops->release() and return the error code if update failed in this
> > function?
> 
> Well, that's what I was thinking.  However the return value of ->release
> doesn't get propagated in sys_close (or indeed anywhere ... no idea why
> it returns an int) thanks to the task work additions, so we'd actually
> have to use the operation whose value is propagated in sys_close() which
> turns out to be flush.
> 
> James
> 

Okay, I think I got you. Just to double check for in case: you are meaning
to implement it at f_ops->flush() instead of f_ops->release().


Thanks & Regards,
Wilson