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Date:   Wed, 11 Jan 2023 15:15:39 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Nathan Chancellor <nathan@kernel.org>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        Boqun Feng <boqun.feng@gmail.com>,
        "H . Peter Anvin" <hpa@zytor.com>, Paul Turner <pjt@google.com>,
        linux-api@vger.kernel.org, Christian Brauner <brauner@kernel.org>,
        Florian Weimer <fw@deneb.enyo.de>, David.Laight@aculab.com,
        carlos@redhat.com, Peter Oskolkov <posk@posk.io>,
        Alexander Mikhalitsyn <alexander@mihalicyn.com>,
        Chris Kennelly <ckennelly@google.com>
Subject: Re: [RFC PATCH tip] rseq: Fix: Increase AT_VECTOR_SIZE_BASE to match
 rseq auxvec entries
Message-ID: <Y77Ei4/WIT4ARQQj@hirez.programming.kicks-ass.net>
References: <20230104192054.34046-1-mathieu.desnoyers@efficios.com>
 <Y7XSWdLZqwEXWXml@dev-arch.thelio-3990X>
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On Wed, Jan 04, 2023 at 12:24:09PM -0700, Nathan Chancellor wrote:
> On Wed, Jan 04, 2023 at 02:20:54PM -0500, Mathieu Desnoyers wrote:
> > Two new auxiliary vector entries are introduced for rseq without
> > matching increment of the AT_VECTOR_SIZE_BASE, which causes failures
> > with CONFIG_HARDENED_USERCOPY=y.
> > 
> > Reported-by: Nathan Chancellor <nathan@kernel.org>
> > Link: https://lore.kernel.org/r/Y7XJKZhuU9VJZQ11@dev-arch.thelio-3990X
> > Fixes: 317c8194e6ae ("rseq: Introduce feature size and alignment ELF auxiliary vector entries")
> > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> 
> This resolves the boot failure with the configuration I tested:
> 
> Tested-by: Nathan Chancellor <nathan@kernel.org>

Thanks!