Re: [PATCH] MIPS: kernel: Clear FPU states when setting up kernel threads

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On Thu, Nov 30, 2023 at 05:36:01PM +0100, Thomas Bogendoerfer wrote:
> io_uring sets up the io worker kernel thread via a syscall out of an
> user space prrocess. This process might have used FPU and since
> copy_thread() didn't clear FPU states for kernel threads a BUG()
> is triggered for using FPU inside kernel. Move code around
> to always clear FPU state for user and kernel threads.
> Cc: stable@xxxxxxxxxxxxxxx
> Reported-by: Aurelien Jarno <aurel32@xxxxxxxxxx>
> Closes:
> Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
> ---
>  arch/mips/kernel/process.c | 25 +++++++++++++------------
>  1 file changed, 13 insertions(+), 12 deletions(-)

applied to mips-fixes.


Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

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