On 2020/8/29 下午3:49, Qu Wenruo wrote:
>
>
> On 2020/8/29 下午3:44, Qu Wenruo wrote:
>> Hi,
>>
>> Recently built a v5.9-rc2 kernel, it boots fine, but unable to load any
>> kernel module.
>>
>> After some debugging, it shows that it's due to RWX check failure:
>>
>> load_module: start
>> module_enforce_rwx_sections: index=22 sh_flags=0x7 shf_wx=0x5
>> layout_and_allocate: module enforce rwx sections
>> load_module: failed to alloc layout and allocate
>> load_module: end
>>
>> Futhermore, it's unable to disable the RWX check through "make
>> menuconfig", since the ARCH_OPTIONAL_KERNEL_RWX is no for arm64.
>>
>> The offending section 22 looks like this: (the kernel reports 38
>> sectors, while we only have 37, thus near-by sections are also shown here).
>>
>> 20 .data 00000aa0 0000000000000000 0000000000000000 00086d08
>> 2**3
>> CONTENTS, ALLOC, LOAD, RELOC, DATA
>> 21 __bug_table 000000cc 0000000000000000 0000000000000000 000877a8
>> 2**2
>> CONTENTS, ALLOC, LOAD, RELOC, DATA
>> 22 __dyndbg 0000b9b8 0000000000000000 0000000000000000 00087878
>> 2**3
>> CONTENTS, ALLOC, LOAD, RELOC, DATA
>> 23 .data.unlikely 00000012 0000000000000000 0000000000000000
>> 00093230 2**0
>> CONTENTS, ALLOC, LOAD, DATA
>>
>> I'm using GCC 10.2.0, could this be the cause?
>
> I should check the git log, the module_enforce_rwx_sections() is just
> recently added by commit 5c3a7db0c7ec ("module: Harden STRICT_MODULE_RWX").
>
> Hi Peter, any idea how could this commit causing a regression on arm64
> but not on x86_64?
And obviously, reverting it solves the problem of mine.
(Now happy working 4K sector size btrfs support on 64K page size system)
Thanks,
Qu
>
> Thanks,
> Qu
>
>>
>> Thanks,
>> Qu
>>
>>
>>
>
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