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From: Florian Weimer <fweimer@redhat.com>
To: Szabolcs Nagy <szabolcs.nagy@arm.com>
Cc: Adhemerval Zanella via Libc-alpha <libc-alpha@sourceware.org>
Subject: Re: [PATCH] aarch64: MTE compatible strchrnul
Date: Wed, 03 Jun 2020 17:24:21 +0200	[thread overview]
Message-ID: <871rmwuq8q.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <20200603151804.GG21536@arm.com> (Szabolcs Nagy's message of "Wed, 3 Jun 2020 16:18:05 +0100")

* Szabolcs Nagy:

> The 06/03/2020 17:04, Florian Weimer via Libc-alpha wrote:
>> * Adhemerval Zanella via Libc-alpha:
>> 
>> > Afaiu there is no need to add any marking for MTE, the main difference
>> > it enforce 16-byte granularity read. I think you are confusing with
>> > BTI, which does require the GNU note.
>> 
>> If there is no compatibility issue, then why are these changes to the
>> glibc string functions needed?
>> 
>> Clearly I'm confused.
>
> string functions have problem (2): they assume that
> if an address is accessible then everything on that
> page is accessible via the same pointer (which
> is no longer true with mte).

Ahh.

> i think we can add the mte-safe string functions and
> tackle the abi compatibility issues separately:

I agree that markup is a separate issue.

Thanks,
Florian


  reply	other threads:[~2020-06-03 15:24 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-03  9:43 Andrea Corallo
2020-06-03 11:27 ` Florian Weimer
2020-06-03 14:14   ` Andrea Corallo
2020-06-03 14:24     ` Florian Weimer
2020-06-03 14:33       ` Adhemerval Zanella
2020-06-03 14:53         ` Szabolcs Nagy
2020-06-03 15:03           ` Szabolcs Nagy
2020-06-03 15:04           ` Adhemerval Zanella
2020-06-03 15:04         ` Florian Weimer
2020-06-03 15:18           ` Szabolcs Nagy
2020-06-03 15:24             ` Florian Weimer [this message]
2020-06-03 14:40 ` Adhemerval Zanella
2020-06-03 16:01   ` Andrea Corallo
2020-06-04 12:04     ` H.J. Lu
2020-06-04 19:48       ` Szabolcs Nagy
2020-06-04 20:03         ` H.J. Lu
2020-06-05  7:38           ` Szabolcs Nagy
2020-06-05  8:45             ` Wilco Dijkstra
2020-06-05 16:25               ` Szabolcs Nagy

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