Date: Tue, 28 Feb 2006 13:33:47 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org, John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: Tanmay <tanmayinamdar@gmail.com> Subject: Re: Accessing address space of a process through kld!! Message-ID: <200602281333.49277.jhb@freebsd.org> In-Reply-To: <20060227183142.GJ840@funkthat.com> References: <cdc1d1310602270026o6b17101et14ddf301269edc37@mail.gmail.com> <20060227183142.GJ840@funkthat.com>
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On Monday 27 February 2006 13:31, John-Mark Gurney wrote: > Tanmay wrote this message on Mon, Feb 27, 2006 at 13:56 +0530: > > How do I access the address space ie text,data and stack of a (user > > level)process whose pid I know from my kld. for eg: Suppose 'vi' is running > > and I want to access its address space through my kld, then how do I do it? > > You look up the process with pfind(9), and then you can use uio(9) to > transfer data into kernel space... Don't forget to PROC_UNLOCK the > struct once you are done referencing it. You can use the proc_rwmem() function (it takes a uio and a struct proc) to do the actual I/O portion. You can see example use in the ptrace() syscall. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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