netdev - Re: [PATCH net 3/3] r8169: increase the lifespan of the hardware counters dump area.

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]

Message-ID: <20150907215251.GA4897@electric-eye.fr.zoreil.com>
Date:	Mon, 7 Sep 2015 23:52:51 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Corinna Vinschen <vinschen@...hat.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	pomidorabelisima@...il.com
Subject: Re: [PATCH net 3/3] r8169: increase the lifespan of the hardware
 counters dump area.

Corinna Vinschen <vinschen@...hat.com> :
[...]
> I have a bit of a problem with this patch.  It crashes when loading the
> driver manually w/ modprobe.  For some reason dev_get_stats is called
> during rtl_init_one and at that time the counters pointer is NULL, so
> the kernel gets a SEGV.
>
>  After I worked around that I got a SEGV in
> rtl_remove_one, which I still have to find out why.  I didn't test with
> the latest kernel, though, so I still have to check if that's the reason
> for the crashes.  That takes a bit longer, I just wanted to let you
> know.

Call me stupid: I forgot that it's perfectly fine to request the stats
of a down interface. :o/

Updated patch is on the way.

> There's also a problem with rtl8169_cmd_counters:  It always calls
> rtl_udelay_loop_wait_low w/ rtl_reset_counters_cond, even when called
> from rtl8169_update_counters, where it should call
> rtl_udelay_loop_wait_low w/ rtl_counters_cond to check for the
> CounterDump flag, rather than for the CounterReset flag.
> 
> For now I applied the below patch, but I think it's a bit ugly to
> conditionalize the rtl_cond struct by the incoming flag value.

<captain obvious>

Let's check both at once:

	return RTL_R32(CounterAddrLow) & (CounterDump | CounterReset);

</captain obvious>

Thanks for reviewing.

-- 
Ueimor
--
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