Date: Mon, 16 Jun 2003 12:49:35 -0700 From: John-Mark Gurney <gurney_j@efn.org> To: Robert Watson <rwatson@freebsd.org> Cc: arch@freebsd.org Subject: Re: make /dev/pci really readable Message-ID: <20030616194935.GR73854@funkthat.com> In-Reply-To: <Pine.NEB.3.96L.1030616135002.8726B-100000@fledge.watson.org> References: <20030616074122.GF73854@funkthat.com> <Pine.NEB.3.96L.1030616135002.8726B-100000@fledge.watson.org>
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Robert Watson wrote this message on Mon, Jun 16, 2003 at 13:54 -0400:
> On Mon, 16 Jun 2003, John-Mark Gurney wrote:
> will affect all users in the system). Could you do that cleanup in the
> first pass, then revisit the permissions change?
ok, I've taken a look at it, and I don't see any major problems with it
besides what I mentioned earlier. I've attached a patch that only lets
you do pciconf -l (query pci devices we know about), but it also enforces
the register to be in valid bounds and also makes sure it's aligned. I
think it's safest to do it here. Should I copy the restrictions on
read into the write block (actually, take them out of the case so they
can be shared)?
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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Index: pci_user.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/pci/pci_user.c,v
retrieving revision 1.9
diff -u -r1.9 pci_user.c
--- pci_user.c 2003/03/03 12:15:44 1.9
+++ pci_user.c 2003/06/16 19:44:39
@@ -176,7 +176,7 @@
const char *name;
int error;
- if (!(flag & FWRITE))
+ if (!(flag & FWRITE) && cmd != PCIOCGETCONF)
return EPERM;
@@ -342,7 +342,7 @@
for (cio->num_matches = 0, error = 0, i = 0,
dinfo = STAILQ_FIRST(devlist_head);
(dinfo != NULL) && (cio->num_matches < ionum)
- && (error == 0) && (i < pci_numdevs);
+ && (error == 0) && (i < pci_numdevs) && (dinfo != NULL);
dinfo = STAILQ_NEXT(dinfo, pci_links), i++) {
if (i < cio->offset)
@@ -412,7 +412,10 @@
}
case PCIOCREAD:
io = (struct pci_io *)data;
- switch(io->pi_width) {
+ if (io->pi_reg < 0 || io->pi_reg + io_pi_width > PCI_REGMAX ||
+ io->pi_reg & (io->pi_width - 1))
+ error = EINVAL;
+ else switch(io->pi_width) {
case 4:
case 2:
case 1:
@@ -439,7 +442,7 @@
}
break;
default:
- error = ENODEV;
+ error = EINVAL;
break;
}
break;
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