linux-kernel - Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti

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Message-ID: <20201006163943.GD5259@sirena.org.uk>
Date:   Tue, 6 Oct 2020 17:39:43 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jeremy Linton <jeremy.linton@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        ardb@...nel.org, will@...nel.org, catalin.marinas@....com,
        davem@...emloft.net, herbert@...dor.apana.org.au,
        linux-kernel@...r.kernel.org, dave.martin@....com
Subject: Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to
 bti_c

On Tue, Oct 06, 2020 at 11:33:26AM -0500, Jeremy Linton wrote:
> The AES code uses a 'br x7' as part of a function called by
> a macro. That branch needs a bti_j as a target. This results
> in a panic as seen below. Using x16 (or x17) with an indirect
> branch keeps the target bti_c.

Reviewed-by: Mark Brown <broonie@...nel.org>

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