Re: Using System Calls from kernel space

[Elad Lahav <elad_lahav@xxxxxxxxxxxxxxxxxxxxx>]

I believe the only problem with that is that sys_sched_setscheduler() 
expects the struct sched_param pointer to reside in user-space memory. 
Therefore, when do_sched_setscheduler calls copy_from_user() to trasnfer 
the contents to a kernel-space structure, it will fail.

Elad

endeavor john wrote:
> Hi All ,
>              I wanted to use a system call from kernel module to change 
> the priority of the process using sys_sched_setscheduler from kernel 
> space  after using get_fs by modifying the |addr_limit| of the task to 
> KERNEL_DS using set_fs and get_fs  apis.
>  
> I wanted to what will be the disadvantage in using the System Calls from 
> kernel space if  it not any file system call.
> Thanks and Regards,
> John Endeavour


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