From: Mark Brown <broonie@kernel.org>
To: "dalias@libc.org" <dalias@libc.org>,
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Subject: Re: [musl] Re: [PATCH v8 00/38] arm64/gcs: Provide support for GCS in userspace
Date: Thu, 14 Mar 2024 14:03:30 +0000 [thread overview]
Message-ID: <d334e9b9-659c-476f-b28d-42d3ac3dc591@sirena.org.uk> (raw)
In-Reply-To: <20240302145702.GD1884416@port70.net>
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On Sat, Mar 02, 2024 at 03:57:02PM +0100, Szabolcs Nagy wrote:
> * Mark Brown <broonie@kernel.org> [2024-02-21 17:36:12 +0000]:
> > > I said NOP but there's no reason it strictly needs to be a NOP. It
> > > could instead do something reasonable to convey the state of racing
> > > with shadow stack being disabled.
> > This feels like it's getting complicated and I fear it may be an uphill
> > struggle to get such code merged, at least for arm64. My instinct is
> the aarch64 behaviour is already nop
> for gcs instructions when gcs is disabled.
> the isa was designed so async disable is
> possible.
Yeah, we'd need to handle GCSPR_EL0 somehow (currently it's inaccessible
when GCS is disabled) and userspace would need to take care it's not
doing something that could get stuck if for example a pop didn't
actually *do* anything.
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next prev parent reply other threads:[~2024-03-14 14:07 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org>
2024-02-20 16:36 ` Stefan O'Rear
2024-02-20 18:41 ` Edgecombe, Rick P
2024-02-20 18:57 ` Rich Felker
2024-02-20 23:30 ` Edgecombe, Rick P
2024-02-20 23:54 ` dalias
2024-02-21 0:35 ` Edgecombe, Rick P
2024-02-21 0:44 ` Mark Brown
2024-02-21 1:27 ` dalias
2024-02-21 2:11 ` Edgecombe, Rick P
2024-02-21 4:18 ` Edgecombe, Rick P
2024-02-21 13:53 ` Mark Brown
2024-02-21 14:58 ` dalias
2024-02-21 17:36 ` Mark Brown
2024-02-21 17:57 ` dalias
2024-02-21 18:12 ` Edgecombe, Rick P
2024-02-21 18:30 ` dalias
2024-02-21 18:53 ` Edgecombe, Rick P
2024-02-21 19:06 ` dalias
2024-02-21 19:22 ` Edgecombe, Rick P
2024-02-21 20:18 ` H.J. Lu
2024-02-21 20:25 ` H.J. Lu
2024-02-21 21:12 ` H.J. Lu
2024-02-21 20:18 ` dalias
2024-02-22 13:57 ` Mark Brown
2024-02-21 18:32 ` Mark Brown
2024-02-21 19:10 ` dalias
2024-03-02 14:57 ` Szabolcs Nagy
2024-03-02 15:05 ` H.J. Lu
2024-03-14 14:03 ` Mark Brown [this message]
2024-02-20 23:59 ` Stefan O'Rear
2024-02-21 0:40 ` Mark Brown
2024-02-21 4:30 ` Edgecombe, Rick P
2024-02-20 20:14 ` Mark Brown
2024-02-20 23:30 ` Edgecombe, Rick P
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