Le 18/12/2018 à 15:07, Jonathan Neuschäfer a écrit :
On Tue, Dec 18, 2018 at 09:18:42AM +0000, Christophe Leroy wrote:
The only difference I see then are the flags. Everything else is seems
identical.
I know you tried already, but would you mind trying once more with the
following change ?
[...]
- setbat(idx, PAGE_OFFSET + base, base, size, PAGE_KERNEL_TEXT);
+ setbat(idx, PAGE_OFFSET + base, base, size, PAGE_KERNEL_X);
Good call, with this workaround on top of patches 1-3, it boots again:
# mount -t debugfs d /sys/kernel/debug
# cat /sys/kernel/debug/powerpc/block_address_translation
---[ Instruction Block Address Translation ]---
0: 0xc0000000-0xc0ffffff 0x00000000 Kernel EXEC
1: -
2: 0xc1000000-0xc17fffff 0x01000000 Kernel EXEC
3: -
4: 0xd0000000-0xd1ffffff 0x10000000 Kernel EXEC
5: -
6: -
7: -
---[ Data Block Address Translation ]---
0: 0xc0000000-0xc0ffffff 0x00000000 Kernel RW
1: 0xfffe0000-0xffffffff 0x0d000000 Kernel RW no cache guarded
2: 0xc1000000-0xc17fffff 0x01000000 Kernel RW
3: -
4: 0xd0000000-0xd1ffffff 0x10000000 Kernel RW
5: -
6: -
7: -
I think we may have some code trying to modify the kernel text without using
code patching functions.
Is there any faster way than to sprinkle some printks in setup_kernel
and try to find the guilty piece of code this way?
Can you start with the serie
https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=75072 ?
Christophe
Jonathan
