Thank you, Sangman. Reimplement access_process_vm() or get_user_pages seems to be impractical... What I am thinking is to use system call like ptrace, but can a module call ptrace?? That also sounds strange... Fangkai On Wed, Apr 28, 2010 at 7:47 PM, Sangman Kim <nemonemo@xxxxxxxxxxxxx> wrote: > Hi Fangkai, > > 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 >> >> >> >> -- >> >> To unsubscribe from this list: send an email with >> >> "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx >> >> Please read the FAQ at http://kernelnewbies.org/FAQ >> >> >> > >> > > > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
