linux-kernel - Re: [PATCH v3 1/2] ACPI / tables: simplify acpi_parse

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Date:	Thu, 15 Oct 2015 23:37:18 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Al Stone <al.stone@...aro.org>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>
Subject: Re: [PATCH v3 1/2] ACPI / tables: simplify acpi_parse_entries

On Thursday, October 15, 2015 09:57:38 AM Al Stone wrote:
> On 10/15/2015 09:44 AM, Sudeep Holla wrote:
> > Hi Rafael,
> > 
> > On 01/10/15 16:11, Sudeep Holla wrote:
> >> acpi_parse_entries passes the table end pointer to the sub-table entry
> >> handler. acpi_parse_entries itself could validate the end of an entry
> >> against the table end using the length in the sub-table entry.
> >>
> >> This patch adds the validation of the sub-table entry end using the
> >> length field.This will help to eliminate the need to pass the table end
> >> to the handlers.
> >>
> >> It also moves the check for zero length entry early so that execution of
> >> the handler can be avoided.
> >>
> >> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> > 
> > Now that Al's MADT is queued, can you consider applying these ?
> > 
> 
> I think we have to remove my patches from the queue until I can make
> them arch-specific; doing these MADT checks breaks far too many existing
> x86 systems where the firmware does things it should not;

Right.  I've dropped the series already.

> re-reading some of the ia64 kernel code, there's a pathological case there
> where it could break (but shouldn't if iasl is being used to compile tables).

I wouldn't count on iasl being used.

> I'll be working on the new version today.

Thanks!

Rafael

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