On Wed, Apr 14, 2010 at 05:21:00PM -0400, John Baldwin wrote: > On Wednesday 14 April 2010 4:22:56 pm Fernando Apestegu?a wrote: > > Hi all, > > > > I'm trying to read process memory other than the current process in > > kernel. I was told to use the proc_rwmem function, however I can't get > > it working properly. At first, I'm trying to read how many elements > > the environment variables vector has. To do this I tried this from a > > linprocfs filler function: > > > > > > struct iovec iov; > > struct uio tmp_uio; > > struct ps_strings *pss; > > int ret_code; > > > > buff = malloc(sizeof(struct ps_strings), M_TEMP, M_WAITOK); > > memset(buff, 0, sizeof(struct ps_strings)); > > > > PROC_LOCK_ASSERT(td->td_proc, MA_NOTOWNED); > > iov.iov_base = (caddr_t) buff; > > iov.iov_len = sizeof(struct ps_strings); > > tmp_uio.uio_iov = &iov; > > tmp_uio.uio_iovcnt = 1; > > tmp_uio.uio_offset = (off_t)(p->p_sysent->sv_psstrings); > > tmp_uio.uio_resid = sizeof(struct ps_strings); > > tmp_uio.uio_segflg = UIO_USERSPACE; > > tmp_uio.uio_rw = UIO_READ; > > tmp_uio.uio_td = td; > > ret_code = proc_rwmem(td->td_proc, &tmp_uio); > > I think you want to use 'p' instead of 'td->td_proc' here. As it is you are > reading from the current process instead of the target process I believe.
And UIO_USERSPACE sound suspicious. Note that segment flag is for the requestor address space.
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