linux-kernel - Re: [RFT PATCH] ieee1394: ohci1394: serialize reset requests and irq handler

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]

Message-ID: <45BA4AFA.1080106@s5r6.in-berlin.de>
Date:	Fri, 26 Jan 2007 19:39:54 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux-kernel@...r.kernel.org
CC:	linux1394-devel@...ts.sourceforge.net,
	Robert Crocombe <rcrocomb@...e.org>
Subject: Re: [RFT PATCH] ieee1394: ohci1394: serialize reset requests and
 irq handler

I wrote:
>   - Use the ohci->event_lock to serialize the trigger for software-
>     enforced bus resets against a large portion of the IRQ handler.
...
> Todo:
>   - Test.
>   - Audit *all* of ohci1394's register accesses for the need of
>     serialization by spinlocks + mmiowb.
...

PS: AFAIU what I'm doing here, it affects

  - bus resets triggered by local software (the bug report was also
    about externally triggered bus resets),

  - and potentially bus resets (even externally triggered ones) on SMP
    systems with (PCI) bridges if the IRQ handler migrates to a another
    CPU between two interrupt events in quick succession.

Can the latter happen in Linux or/and with -rt kernels?
-- 
Stefan Richter
-=====-=-=== ---= ==-=-
http://arcgraph.de/sr/
-
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/