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From: "Alex G." <>
To: Bjorn Helgaas <>
Subject: Re: [PATCH RESEND] PCI/AER: Use a common function to print AER error bits
Date: Mon, 30 Apr 2018 12:41:26 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 04/30/2018 12:15 PM, Bjorn Helgaas wrote:
> On Sat, Apr 28, 2018 at 12:07:48PM -0500, Alex G. wrote:

>> I could update the offending line to say:
>>  +	info.first_error = PCI_ERR_CAP_FEP(aer->cap_control);
> That's what I would have expected.  So I'd say either do this, or add
> a comment about why it's not the right thing to do.


>> Though I still have the concerns with validating CPER data:
>>> I can see a way to use even more common printk code, but that requires
>>> validating the PCI regs we get from firmware. That means we need to make
>>> a guarantee about CPER that is beyond the scope of this patch.
> Sounds like this is material for another patch, but if/when you do
> that, I'd like to understand your concern about validating the
> registers we get from firmware.  Are you worried about getting
> incorrect register contents, then printing the wrong info, making
> the wrong decision about how to recover, something else?

I don't trust firmware, and I have daymares about firmware leaving these
fields uninitialized. In jargon, I'd like to treat it as external
untrusted serialized data.


  reply	other threads:[~2018-04-30 17:41 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-17 17:09 Alexandru Gagniuc
2018-04-26 17:27 ` Tyler Baicar
2018-04-27 22:43 ` Bjorn Helgaas
2018-04-28 16:46   ` Alex G.
2018-04-28 17:07     ` Alex G.
2018-04-30 17:15       ` Bjorn Helgaas
2018-04-30 17:41         ` Alex G. [this message]
2018-05-07 22:06           ` Bjorn Helgaas
2018-04-30 19:52 ` [PATCH v2] " Alexandru Gagniuc
2018-05-07 22:13   ` Bjorn Helgaas

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