From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
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: Wed, 21 Feb 2024 04:18:02 +0000 [thread overview]
Message-ID: <41b401d59b3846f44cee33f1d680b2534b7c0dea.camel@intel.com> (raw)
In-Reply-To: <6332963a828d247ef935b7d3352fa1fbd83b11b0.camel@intel.com>
On Tue, 2024-02-20 at 18:11 -0800, Rick Edgecombe wrote:
> Some specific cases that were still open were longjmp()ing off of a
> custom userspace threading library stack, which may not have left a
> token behind when it jumped to a new stack. And also, potentially off
> of an alt shadow stack in the future, depending on whether it leaves
> a
> restore token when handling a signal. (the problem there, is if there
> is no room to leave it).
Ah, I remember the other one. If the token on the target shadow stack
is at the end of the shadow stack, it may not be able to handle pushing
a shadow stack signal frame if a signal hits while is unwinding through
the token. As in, where normal longjmp() is direct transition, in this
case the longjmp() operation can be temporarily in a place where a
signal cannot be handled.
next prev parent reply other threads:[~2024-02-21 15:25 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 [this message]
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
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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