linux-kernel - Re: [PATCH] powerpc/powermac: Fix low_sleep

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Date:   Fri, 11 Sep 2020 12:30:53 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/powermac: Fix low_sleep_handler with KUAP and
 KUEP



Le 11/09/2020 à 01:56, Michael Ellerman a écrit :
> Christophe Leroy <christophe.leroy@...roup.eu> writes:
>> low_sleep_handler() has an hardcoded restore of segment registers
>> that doesn't take KUAP and KUEP into account.
>>
>> Use head_32's load_segment_registers() routine instead.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
>> Fixes: a68c31fc01ef ("powerpc/32s: Implement Kernel Userspace Access Protection")
>> Fixes: 31ed2b13c48d ("powerpc/32s: Implement Kernel Userspace Execution Prevention.")
>> Cc: stable@...r.kernel.org
>> ---
>>   arch/powerpc/platforms/powermac/sleep.S | 9 +--------
>>   1 file changed, 1 insertion(+), 8 deletions(-)
> 
> Doesn't build? pmac32_defconfig, gcc 9.3.0:
> 
> ld: arch/powerpc/platforms/powermac/sleep.o: in function `core99_wake_up':
> (.text+0x25c): undefined reference to `load_segment_registers'
> 
> Missing _GLOBAL() presumably?

Oops .. :(

v2 sent out.

Thanks
Christophe