Re: [PATCH stable 4.19] arm64: errata: Remove AES hwcap for COMPAT tasks

[Greg Kroah-Hartman]

On Thu, Oct 20, 2022 at 04:01:07PM -0700, Florian Fainelli wrote:
> From: James Morse <james.morse@xxxxxxx>
> 
> commit 44b3834b2eed595af07021b1c64e6f9bc396398b upstream
> 
> Cortex-A57 and Cortex-A72 have an erratum where an interrupt that
> occurs between a pair of AES instructions in aarch32 mode may corrupt
> the ELR. The task will subsequently produce the wrong AES result.
> 
> The AES instructions are part of the cryptographic extensions, which are
> optional. User-space software will detect the support for these
> instructions from the hwcaps. If the platform doesn't support these
> instructions a software implementation should be used.
> 
> Remove the hwcap bits on affected parts to indicate user-space should
> not use the AES instructions.
> 
> Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
> Signed-off-by: James Morse <james.morse@xxxxxxx>
> Link: https://lore.kernel.org/r/20220714161523.279570-3-james.morse@xxxxxxx
> Signed-off-by: Will Deacon <will@xxxxxxxxxx>
> [florian: resolved conflicts in arch/arm64/tools/cpucaps and cpu_errata.c]
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> Change-Id: I651a0db2e9d2f304d210ae979ae586e7dcc9744d

No need for Change-Id: in upstream patches :)