Ah, that function is not exported, which means you should look for some other function or you can implement something similar by yourself (or you can illegally use it with a direct address to access_process_vm().)
I don't know about any exported function for similar purpose, but probably others would know.
On Wed, Apr 28, 2010 at 7:38 PM, Yang Fangkai <wolfgang.yang@xxxxxxxxx> wrote:
Hi, Sangman,
Thanks for your reply! I have tried this access_process_vm().
It reports error when I include <../mm/memory.c>, saying redefinition
of __init_module and __init_module...
Fangkai
On Wed, Apr 28, 2010 at 7:35 PM, Sangman Kim <nemonemo@xxxxxxxxxxxxx> wrote:
> Hi,
>
> You might want to look at access_process_vm() in mm/memory.c.
> If you know the pid of the target process, you can use it to search the
> corresponding task_struct using find_task_by_pid_ns() with init_pid_ns.
>
> Good luck :)
>
> Sangman
>
> On Wed, Apr 28, 2010 at 7:21 PM, Yang Fangkai <wolfgang.yang@xxxxxxxxx>
> wrote:
>>
>> Dear List,
>>
>> I am developing a virtual device driver such that the user can
>> write to the driver a process' pid and a virtual address, and the
>> module will use these two values to get the memory contents of the
>> target process. I am wondering if there is any easy functions that can
>> fetch user page's data at this virtual address. Thank you!
>>
>> I have tried get_user but this is not possible because the
>> modules executing get_user at another process's context. I also tried
>> to use ptrace_readdata, however, it seems that the file at
>> /kernel/ptrace.c leaves a function access_process_vm undefined and
>> also I don't know how to compile the source code of my module with
>> this file (the linker seaches file in /linux/include by default). I am
>> wondering if there are any other solutions...
>>
>> Best,
>>
>> Fangkai
>>
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>
>
