linux-kernel - Re: [BUG][PATCH] crypto: arm64: Avoid indirect branch to bti

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Message-ID: <20201006103508.GA5259@sirena.org.uk>
Date:   Tue, 6 Oct 2020 11:35:08 +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
Subject: Re: [BUG][PATCH] crypto: arm64: Avoid indirect branch to bti_c

On Mon, Oct 05, 2020 at 10:48:54PM -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. Instead of trying to replace the branch
> target with a bti_jc, lets replace the indirect branch with a
> bl/ret, bl sequence that can target the existing bti_c.

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

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