On 01/04/2016 06:46 AM, Will Deacon wrote:
> On Sun, Jan 03, 2016 at 05:05:57PM +0100, Ard Biesheuvel wrote:
>> Instead of using absolute addresses for both the exception location
>> and the fixup, use offsets relative to the exception table entry values.
>> Not only does this cut the size of the exception table in half, it is
>> also a prerequisite for KASLR, since absolute exception table entries
>> are subject to dynamic relocation, which is incompatible with the sorting
>> of the exception table that occurs at build time.
>>
>> Cc: Catalin Marinas <[email protected]>
>> Cc: Will Deacon <[email protected]>
>> Signed-off-by: Ard Biesheuvel <[email protected]>
>> ---
>>
>> Note that this patch supersedes the version I sent as part of the series that
>> implements KASLR for arm64:
>> http://thread.gmane.org/gmane.linux.kernel/2116531
>>
>> arch/arm64/include/asm/assembler.h | 2 +-
>> arch/arm64/include/asm/futex.h | 4 ++--
>> arch/arm64/include/asm/uaccess.h | 18 ++++++++++--------
>> arch/arm64/kernel/armv8_deprecated.c | 4 ++--
>> arch/arm64/mm/extable.c | 2 +-
>> scripts/sortextable.c | 2 +-
>> 6 files changed, 17 insertions(+), 15 deletions(-)
>
> This looks good to me, so for the arm64 part (i.e. this patch):
>
> Acked-by: Will Deacon <[email protected]>
May I humbly ask why the [Finnish] you don't use the equivalent of the
x86 _ASM_EXTABLE() macro? In fact, why don't we make that one generic, too?
-hpa
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