From: Al Viro <viro@zeniv.linux.org.uk>
To: Walt Drummond <walt@drummond.us>
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
x86@kernel.org, hpa@zytor.com, brgerst@gmail.com,
linux@dominikbrodowski.net, gustavoars@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86/signals: Fix save/restore signal stack to correctly support sigset_t
Date: Sun, 29 Nov 2020 03:28:23 +0000 [thread overview]
Message-ID: <20201129032823.GA3579531@ZenIV.linux.org.uk> (raw)
In-Reply-To: <CADCN6nyGW0=QS=J+704n-mtAqTxgVrKZC=P8d01NZ_pjssptew@mail.gmail.com>
On Sat, Nov 28, 2020 at 06:19:31PM -0800, Walt Drummond wrote:
> Thanks Al. I want to understand the nuance, so please bear with me as I
> reason this out. The cast in stone nature of this is due to both the need
> to keep userspace and kernel space in sync (ie, you'd have to coordinate
> libc and kernel changes super tightly to pull this off), and any change in
> the size of struct rt_sigframe would break backwards compatibility with
> older binaries, is that correct?
Pretty much so. I would expect gdb and friends to be very unhappy about
that, for starters, along with a bunch of fun stuff like JVM, etc.
Ask the userland folks (libc, gdb, etc.) how would they feel about such
changes. I'm fairly sure that it's _not_ going to be a matter of
changing _NSIG, rebuilding the kernel and living happily ever after.
next prev parent reply other threads:[~2020-11-29 3:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-19 22:11 [PATCH] x86/signals: Fix save/restore signal stack to correctly support sigset_t Walt Drummond
2020-11-28 5:23 ` Al Viro
[not found] ` <CADCN6nyGW0=QS=J+704n-mtAqTxgVrKZC=P8d01NZ_pjssptew@mail.gmail.com>
2020-11-29 2:52 ` Walt Drummond
2020-11-29 3:28 ` Al Viro [this message]
2020-11-29 16:27 ` Walt Drummond
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