Re: [PATCH v6 02/21] arm64: Allow mismatched 32-bit EL0 support
From: Will Deacon <will@kernel.org>
Date: 2021-05-24 20:21:56
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On Fri, May 21, 2021 at 04:22:55PM +0100, Qais Yousef wrote:
On 05/18/21 10:47, Will Deacon wrote:quoted
When confronted with a mixture of CPUs, some of which support 32-bit applications and others which don't, we quite sensibly treat the system as 64-bit only for userspace and prevent execve() of 32-bit binaries. Unfortunately, some crazy folks have decided to build systems like this with the intention of running 32-bit applications, so relax our sanitisation logic to continue to advertise 32-bit support to userspace on these systems and track the real 32-bit capable cores in a cpumask instead. For now, the default behaviour remains but will be tied to a command-line option in a later patch. Signed-off-by: Will Deacon <will@kernel.org> --- arch/arm64/include/asm/cpucaps.h | 3 +-Heads up. I just tried to apply this on 5.13-rc2 and it failed because cpucaps. was removed; it's autogenerated now. See commit 0c6c2d3615ef: ()"arm64: Generate cpucaps.h")
Yup, cheers. I'll sort that out once we're at the stage where we're merging patches. Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel