On Wed, Apr 14, 2010 at 11:35 PM, Kostik Belousov <[email protected]> wrote: > 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.
Ugh, sorry. Copy-paste error. Yes, that should be UIO_SYSSPACE. > _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
