[ARM64][GCC10] Kernel can't load any module due to RWX check
Qu Wenruo
quwenruo.btrfs at gmx.com
Sat Aug 29 03:44:37 EDT 2020
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?
Thanks,
Qu
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