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BUG: unable to handle kernel paging request at drv.c#L58
Hi @vnik5287 ,
Thank you for the informative blog and the code. I am trying to test this on the kernel 4.15 and getting
this error "BUG: unable to handle kernel paging request at 00007ffcdfbfb5f0" at line drv.c#L58.
Any idea why? I should able to access that user space address (&req) from kernel, right?
Kernel throws this at this line (drv.c#L58.):
0xffffffffa013d0e8 <device_ioctl+43> mov (%rax),%rax
Crash log:
[ 478.990333] BUG: unable to handle kernel paging request at 00007fffe3542f90
[ 478.990338] IP: device_ioctl+0x2d/0x82 [drv]
[ 478.990339] PGD 8000000232ede067 P4D 8000000232ede067 PUD 232d60067 PMD 232f7c067 PTE 8000000203f12867
[ 478.990342] Oops: 0001 [#1] SMP PTI```
Thanks in advance.
assignment to ‘void (*)(void)’ from incompatible pointer type
When attempting to build via make, I am getting this error:
drv.c: In function ‘device_ioctl’:
drv.c:60:6: error: assignment to ‘void (*)(void)’ from incompatible pointer type ‘long unsigned int **’ [-Werror=incompatible-pointer-types]
60 | fn = &ops[req->offset];
| ^
cc1: some warnings being treated as errors
assignment to ‘void (*)(void)’ from incompatible pointer type
drv.c: In function ‘device_ioctl’:
drv.c:60:6: error: assignment to ‘void (*)(void)’ from incompatible pointer type ‘long unsigned int **’ [-Werror=incompatible-pointer-types]
60 | fn = &ops[req->offset];
| ^
cc1: some warnings being treated as errors
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