From: Dave Martin <Dave.Martin@arm.com>
To: Boyan Karatotev <boian4o1@gmail.com>
Cc: Boyan Karatotev <boyan.karatotev@arm.com>,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
amit.kachhap@arm.com, vincenzo.frascino@arm.com,
Shuah Khan <shuah@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/4] kselftests/arm64: add PAuth test for whether exec() changes keys
Date: Wed, 16 Sep 2020 16:38:12 +0100 [thread overview]
Message-ID: <20200916153809.GZ6642@arm.com> (raw)
In-Reply-To: <4f38a974-d5a0-87e6-3db3-647e3cc32c0e@gmail.com>
On Tue, Sep 15, 2020 at 04:18:28PM +0100, Boyan Karatotev wrote:
> On 07/09/2020 11:27 am, Dave Martin wrote:
> > On Thu, Sep 03, 2020 at 11:20:25AM +0100, Boyan Karatotev wrote:
> >> On 02/09/2020 18:00, Dave Martin wrote:
> >>> On Fri, Aug 28, 2020 at 02:16:05PM +0100, Boyan Karatotev wrote:
> >>>> +int exec_sign_all(struct signatures *signed_vals, size_t val)
> >>>> +{
> >>>
> >>> Could popen(3) be used here?
> >>>
> >>> Fork-and-exec is notoriously fiddly, so it's preferable to use a library
> >>> function to do it where applicable.I would love to, but the worker needs a bidirectional channel and popen
> >> only gives a unidirectional stream.
> >
> > Ah, fair point.
> >
> > Would it help if you created an additional pipe before calling popen()?
> >
> > May not be worth it, though. For one thing, wiring that extra pipe to
> > stdin or stdout in the child process would require some extra work...
> Well, I probably could, but I doubt the result would be any better. I
> agree that I'm not sure the effort is worth it and would rather keep it
> the same.
Sure, fair enough.
Ideally kselftest would provide some common code for this sort of thing,
but I guess that's a separate discussion.
Cheers
---Dave
next prev parent reply other threads:[~2020-09-16 18:02 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-28 13:16 [PATCH 0/4] kselftests/arm64: add PAuth tests Boyan Karatotev
2020-08-28 13:16 ` [PATCH 1/4] kselftests/arm64: add a basic Pointer Authentication test Boyan Karatotev
2020-08-28 14:28 ` Vincenzo Frascino
2020-08-31 8:05 ` Amit Kachhap
2020-09-02 16:49 ` Dave Martin
2020-09-03 10:12 ` Boyan Karatotev
2020-09-07 10:23 ` Dave Martin
2020-08-28 13:16 ` [PATCH 2/4] kselftests/arm64: add nop checks for PAuth tests Boyan Karatotev
2020-08-28 14:30 ` Vincenzo Frascino
2020-08-31 8:09 ` Amit Kachhap
2020-08-28 13:16 ` [PATCH 3/4] kselftests/arm64: add PAuth test for whether exec() changes keys Boyan Karatotev
2020-08-28 14:33 ` Vincenzo Frascino
2020-08-31 8:13 ` Amit Kachhap
2020-09-02 17:00 ` Dave Martin
2020-09-03 10:20 ` Boyan Karatotev
2020-09-07 10:27 ` Dave Martin
2020-09-15 15:18 ` Boyan Karatotev
2020-09-16 15:38 ` Dave Martin [this message]
2020-08-28 13:16 ` [PATCH 4/4] kselftests/arm64: add PAuth tests for single threaded consistency and key uniqueness Boyan Karatotev
2020-08-28 14:36 ` Vincenzo Frascino
2020-08-31 8:20 ` Amit Kachhap
2020-09-02 16:48 ` [PATCH 0/4] kselftests/arm64: add PAuth tests Dave Martin
2020-09-03 9:46 ` Boyan Karatotev
2020-09-07 10:29 ` Dave Martin
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