netdev - Re: Fw: [Bug 8013] New: select for write hangs on a socket after write returned ECONNRESET

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, 16 Feb 2007 18:39:58 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	netdev@...r.kernel.org
Subject: Re: Fw: [Bug 8013] New: select for write hangs on a socket after write returned ECONNRESET

On Fri, Feb 16, 2007 at 06:28:58PM +0300, Evgeniy Polyakov (johnpol@....mipt.ru) wrote:
> On Fri, Feb 16, 2007 at 06:25:57PM +0300, Evgeniy Polyakov (johnpol@....mipt.ru) wrote:
> > On Thu, Feb 15, 2007 at 04:04:05PM -0800, Stephen Hemminger (shemminger@...ux-foundation.org) wrote:
> > > Someone want to take a stab at fixing this??

Ok, I've fund a reason - select() only checks if valid output condition
is 
#define POLLOUT_SET (POLLWRBAND | POLLWRNORM | POLLOUT | POLLERR)

Linux never sets POLLERR on shutdown - only on socket error, on shutdown
POLLHUP is setup instead, so reading always shows that:

#define POLLIN_SET (POLLRDNORM | POLLRDBAND | POLLIN | POLLHUP |
POLLERR)

A 'fix' can be to add POLLHUP into POLLOUT_SET or workaround that in
application to check both input and output events in select() or use
poll and explicitly check returned mask.

-- 
	Evgeniy Polyakov
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html