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Message-ID: <YgBCdExhei7VmfHd@hirez.programming.kicks-ass.net>
Date: Sun, 6 Feb 2022 22:49:40 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
"Paul E . McKenney" <paulmck@...nel.org>,
Boqun Feng <boqun.feng@...il.com>,
"H . Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
linux-api@...r.kernel.org,
Christian Brauner <christian.brauner@...ntu.com>,
Florian Weimer <fw@...eb.enyo.de>, David.Laight@...lab.com,
carlos@...hat.com, Peter Oskolkov <posk@...k.io>,
libc-coord@...ts.openwall.com
Subject: Re: [RFC PATCH 1/3] rseq: Introduce feature size and alignment ELF
auxiliary vector entries
On Thu, Feb 03, 2022 at 02:38:51PM -0500, Mathieu Desnoyers wrote:
> @@ -286,6 +287,10 @@ create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec,
> if (bprm->have_execfd) {
> NEW_AUX_ENT(AT_EXECFD, bprm->execfd);
> }
> +#ifdef CONFIG_RSEQ
> + NEW_AUX_ENT(AT_RSEQ_FEATURE_SIZE, offsetof(struct rseq, end));
I've gotta ask, what's up with offsetof(, end) vs sizeof() ?
> + NEW_AUX_ENT(AT_RSEQ_ALIGN, __alignof__(struct rseq));
> +#endif
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