From: Shannon Nelson <snelson@pensando.io>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Luis Chamberlain <mcgrof@kernel.org>,
jeyu@kernel.org, akpm@linux-foundation.org, arnd@arndb.de,
rostedt@goodmis.org, mingo@redhat.com, aquini@redhat.com,
cai@lca.pw, dyoung@redhat.com, bhe@redhat.com,
peterz@infradead.org, tglx@linutronix.de, gpiccoli@canonical.com,
pmladek@suse.com, tiwai@suse.de, schlad@suse.de,
andriy.shevchenko@linux.intel.com, keescook@chromium.org,
daniel.vetter@ffwll.ch, will@kernel.org,
mchehab+samsung@kernel.org, kvalo@codeaurora.org,
davem@davemloft.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/15] net: taint when the device driver firmware crashes
Date: Sat, 9 May 2020 19:15:23 -0700 [thread overview]
Message-ID: <01831b19-5890-e7e0-3801-068dfab5c92a@pensando.io> (raw)
In-Reply-To: <20200510015814.GE362499@lunn.ch>
On 5/9/20 6:58 PM, Andrew Lunn wrote:
> On Sat, May 09, 2020 at 06:01:51PM -0700, Shannon Nelson wrote:
>> On 5/8/20 9:35 PM, Luis Chamberlain wrote:
>>> Device driver firmware can crash, and sometimes, this can leave your
>>> system in a state which makes the device or subsystem completely
>>> useless. Detecting this by inspecting /proc/sys/kernel/tainted instead
>>> of scraping some magical words from the kernel log, which is driver
>>> specific, is much easier. So instead this series provides a helper which
>>> lets drivers annotate this and shows how to use this on networking
>>> drivers.
>>>
>> If the driver is able to detect that the device firmware has come back
>> alive, through user intervention or whatever, should there be a way to
>> "untaint" the kernel? Or would you expect it to remain tainted?
> Hi Shannon
>
> In general, you don't want to be able to untained. Say a non-GPL
> licenced module is loaded, which taints the kernel. It might then try
> to untaint the kernel to hide its.
Yeah, obviously we don't want this to be abuseable. I was just
wondering about reversing this particular status if the broken device
could get itself fixed.
>
> As for firmware, how much damage can the firmware do as it crashed? If
> it is a DMA master, it could of splattered stuff through
> memory. Restarting the firmware is not going to reverse the damage it
> has done.
>
True, and tho' the driver might get the thing restarted, it wouldn't
necessarily know what kind of damage had ensued.
Carry on,
sln
next prev parent reply other threads:[~2020-05-10 2:20 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-09 4:35 [PATCH 00/15] net: taint when the device driver firmware crashes Luis Chamberlain
2020-05-09 4:35 ` [PATCH 01/15] taint: add module firmware crash taint support Luis Chamberlain
2020-05-09 15:18 ` Rafael Aquini
2020-05-09 16:46 ` Luis Chamberlain
2020-05-10 2:19 ` Randy Dunlap
2020-05-09 4:35 ` [PATCH 02/15] ethernet/839: use new module_firmware_crashed() Luis Chamberlain
2020-05-09 4:35 ` [PATCH 03/15] bnx2x: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 04/15] bnxt: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 05/15] bna: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 06/15] liquidio: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 07/15] cxgb4: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 08/15] ehea: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 09/15] qed: " Luis Chamberlain
2020-05-09 6:32 ` [EXT] " Igor Russkikh
2020-05-09 16:42 ` Luis Chamberlain
2020-05-12 16:23 ` Igor Russkikh
2020-05-12 17:34 ` Luis Chamberlain
2020-05-14 14:53 ` Igor Russkikh
2020-05-15 20:32 ` Luis Chamberlain
2020-05-15 20:37 ` Igor Russkikh
2020-05-09 4:35 ` [PATCH 10/15] soc: qcom: ipa: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 11/15] wimax/i2400m: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 12/15] ath10k: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 13/15] ath6kl: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 14/15] brcm80211: " Luis Chamberlain
2020-05-09 4:35 ` [PATCH 15/15] mwl8k: " Luis Chamberlain
2020-05-09 18:35 ` [PATCH 00/15] net: taint when the device driver firmware crashes Jakub Kicinski
2020-05-11 14:11 ` Luis Chamberlain
2020-05-10 1:01 ` Shannon Nelson
2020-05-10 1:58 ` Andrew Lunn
2020-05-10 2:15 ` Shannon Nelson [this message]
2020-05-11 14:13 ` Luis Chamberlain
2020-05-11 19:21 ` Steven Rostedt
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