linux-kernel - Re: [RFC PATCH tip] rseq: Fix: Increase AT_VECTOR_SIZE

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Message-ID: <Y77Ei4/WIT4ARQQj@hirez.programming.kicks-ass.net>
Date:   Wed, 11 Jan 2023 15:15:39 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        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 <brauner@...nel.org>,
        Florian Weimer <fw@...eb.enyo.de>, David.Laight@...lab.com,
        carlos@...hat.com, Peter Oskolkov <posk@...k.io>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>,
        Chris Kennelly <ckennelly@...gle.com>
Subject: Re: [RFC PATCH tip] rseq: Fix: Increase AT_VECTOR_SIZE_BASE to match
 rseq auxvec entries

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@...nel.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@...icios.com>
> 
> This resolves the boot failure with the configuration I tested:
> 
> Tested-by: Nathan Chancellor <nathan@...nel.org>

Thanks!