On 05/18/21 10:47, Will Deacon wrote: > 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@xxxxxxxxxx> > --- > 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") Cheers -- Qais Youesf
