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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