Date: Wed, 26 Feb 2003 08:01:01 -0300 From: "Daniel C. Sobral" <dcs@tcoip.com.br> To: Robert Watson <rwatson@freebsd.org> Cc: current@freebsd.org Subject: Re: mac_mls still panics Message-ID: <3E5C9E6D.5040309@tcoip.com.br> In-Reply-To: <Pine.NEB.3.96L.1030225140317.88812B-100000@fledge.watson.org> References: <Pine.NEB.3.96L.1030225140317.88812B-100000@fledge.watson.org>
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Robert Watson wrote:
> Question on both of these: could you inspect the struct ifnet pointer o=
n
> the mbuf and see what interface they originated from? Also, the dumps =
are
> still showing NULL local variables where it should not be possible -- =
does
> manual inspection of the variables in the debugger reveal different=20
values
> (ifnetlabel, mbuflabel, etc). You might want to see if compiling=20
with -O0
Doesn't make much sense to me. Mmmmm. Well, have a peek:
(kgdb) up 10
#10 0xc0278d16 in mac_mls_check_ifnet_transmit (ifnet=3D0xc25ebc00,=20
ifnetlabel=3D0x0, m=3D0xc0ee1800, mbuflabel=3D0x0)
at /usr/src/sys/security/mac_mls/mac_mls.c:1462
1462 return (mac_mls_single_in_range(p, i) ? 0 : EACCES);
(kgdb) p/x *ifnet
$1 =3D {if_softc =3D 0xc25ebc00, if_name =3D 0xc031d9bb, if_link =3D {tqe=
_next =3D=20
0xc25cde00, tqe_prev =3D 0xc0362f94},
if_addrhead =3D {tqh_first =3D 0xc2608400, tqh_last =3D 0xc2608e60},=20
if_klist =3D {slh_first =3D 0x0},
if_pcount =3D 0x0, if_bpf =3D 0x0, if_index =3D 0x1, if_unit =3D 0x0, =
if_timer =3D 0x0, if_nvlans =3D 0x0,
if_flags =3D 0x8843, if_capabilities =3D 0x8, if_capenable =3D 0x0,=20
if_ipending =3D 0x0, if_linkmib =3D 0x0,
if_linkmiblen =3D 0x0, if_data =3D {ifi_type =3D 0x6, ifi_physical =3D=
0x0,=20
ifi_addrlen =3D 0x6, ifi_hdrlen =3D 0x12,
ifi_recvquota =3D 0x0, ifi_xmitquota =3D 0x0, ifi_mtu =3D 0x5dc,=20
ifi_metric =3D 0x0, ifi_baudrate =3D 0x5f5e100,
ifi_ipackets =3D 0x10b22, ifi_ierrors =3D 0x0, ifi_opackets =3D 0x66=
3,=20
ifi_oerrors =3D 0x0, ifi_collisions =3D 0x0,
ifi_ibytes =3D 0x9ef12c, ifi_obytes =3D 0x1be94, ifi_imcasts =3D 0x1=
0201,=20
ifi_omcasts =3D 0x0, ifi_iqdrops =3D 0x0,
ifi_noproto =3D 0x0, ifi_hwassist =3D 0x0, ifi_unused =3D 0x0,=20
ifi_lastchange =3D {tv_sec =3D 0x0, tv_usec =3D 0x0}},
if_multiaddrs =3D {tqh_first =3D 0xc25c8640, tqh_last =3D 0xc25c8620},=
=20
if_amcount =3D 0x0, if_output =3D 0xc02527e0,
if_input =3D 0xc0252fb0, if_start =3D 0xc014b430, if_done =3D 0x0, if_=
ioctl=20
=3D 0xc014d570,
if_watchdog =3D 0xc014c140, if_poll_recv =3D 0x0, if_poll_xmit =3D 0x0=
,=20
if_poll_intren =3D 0x0,
if_poll_slowinput =3D 0x0, if_init =3D 0xc014c180, if_resolvemulti =3D=
=20
0xc02537e0, if_snd =3D {ifq_head =3D 0x0,
ifq_tail =3D 0x0, ifq_len =3D 0x0, ifq_maxlen =3D 0x7f, ifq_drops =3D=
0x0,=20
ifq_mtx =3D {mtx_object =3D {
lo_class =3D 0xc035ab00, lo_name =3D 0xc031d9bb, lo_type =3D=20
0xc03339a6, lo_flags =3D 0x30000, lo_list =3D {
tqe_next =3D 0xc260847c, tqe_prev =3D 0xc25d7274}, lo_witness =
=3D=20
0xc038c700}, mtx_lock =3D 0x4,
mtx_recurse =3D 0x0, mtx_blocked =3D {tqh_first =3D 0x0, tqh_last =
=3D=20
0xc25ebd08}, mtx_contested =3D {
le_next =3D 0x0, le_prev =3D 0x0}}}, if_poll_slowq =3D 0x0,=20
if_prefixhead =3D {tqh_first =3D 0x0,
tqh_last =3D 0xc25ebd1c}, if_broadcastaddr =3D 0xc0362fc0, if_label =
=3D=20
{l_flags =3D 0x1, l_perpolicy =3D {{
l_ptr =3D 0xc218b120, l_long =3D 0xc218b120}, {l_ptr =3D 0xc2605=
e80,=20
l_long =3D 0xc2605e80}, {
l_ptr =3D 0xc2605f00, l_long =3D 0xc2605f00}, {l_ptr =3D 0x0, l_=
long=20
=3D 0x0}}}}
(kgdb) p ifnetlabel
$2 =3D (struct label *) 0x0
(kgdb) p mbuflabel
$3 =3D (struct label *) 0x0
(kgdb) up
#11 0xc01dad8a in mac_check_ifnet_transmit (ifnet=3D0xc25ebc00,=20
mbuf=3D0xc0ee1800)
at /usr/src/sys/kern/kern_mac.c:2269
2269 &mbuf->m_pkthdr.label);
(kgdb) p/x *ifnet
$4 =3D {if_softc =3D 0xc25ebc00, if_name =3D 0xc031d9bb, if_link =3D {tqe=
_next =3D=20
0xc25cde00, tqe_prev =3D 0xc0362f94},
if_addrhead =3D {tqh_first =3D 0xc2608400, tqh_last =3D 0xc2608e60},=20
if_klist =3D {slh_first =3D 0x0},
if_pcount =3D 0x0, if_bpf =3D 0x0, if_index =3D 0x1, if_unit =3D 0x0, =
if_timer =3D 0x0, if_nvlans =3D 0x0,
if_flags =3D 0x8843, if_capabilities =3D 0x8, if_capenable =3D 0x0,=20
if_ipending =3D 0x0, if_linkmib =3D 0x0,
if_linkmiblen =3D 0x0, if_data =3D {ifi_type =3D 0x6, ifi_physical =3D=
0x0,=20
ifi_addrlen =3D 0x6, ifi_hdrlen =3D 0x12,
ifi_recvquota =3D 0x0, ifi_xmitquota =3D 0x0, ifi_mtu =3D 0x5dc,=20
ifi_metric =3D 0x0, ifi_baudrate =3D 0x5f5e100,
ifi_ipackets =3D 0x10b22, ifi_ierrors =3D 0x0, ifi_opackets =3D 0x66=
3,=20
ifi_oerrors =3D 0x0, ifi_collisions =3D 0x0,
ifi_ibytes =3D 0x9ef12c, ifi_obytes =3D 0x1be94, ifi_imcasts =3D 0x1=
0201,=20
ifi_omcasts =3D 0x0, ifi_iqdrops =3D 0x0,
ifi_noproto =3D 0x0, ifi_hwassist =3D 0x0, ifi_unused =3D 0x0,=20
ifi_lastchange =3D {tv_sec =3D 0x0, tv_usec =3D 0x0}},
if_multiaddrs =3D {tqh_first =3D 0xc25c8640, tqh_last =3D 0xc25c8620},=
=20
if_amcount =3D 0x0, if_output =3D 0xc02527e0,
if_input =3D 0xc0252fb0, if_start =3D 0xc014b430, if_done =3D 0x0, if_=
ioctl=20
=3D 0xc014d570,
if_watchdog =3D 0xc014c140, if_poll_recv =3D 0x0, if_poll_xmit =3D 0x0=
,=20
if_poll_intren =3D 0x0,
if_poll_slowinput =3D 0x0, if_init =3D 0xc014c180, if_resolvemulti =3D=
=20
0xc02537e0, if_snd =3D {ifq_head =3D 0x0,
ifq_tail =3D 0x0, ifq_len =3D 0x0, ifq_maxlen =3D 0x7f, ifq_drops =3D=
0x0,=20
ifq_mtx =3D {mtx_object =3D {
lo_class =3D 0xc035ab00, lo_name =3D 0xc031d9bb, lo_type =3D=20
0xc03339a6, lo_flags =3D 0x30000, lo_list =3D {
tqe_next =3D 0xc260847c, tqe_prev =3D 0xc25d7274}, lo_witness =
=3D=20
0xc038c700}, mtx_lock =3D 0x4,
mtx_recurse =3D 0x0, mtx_blocked =3D {tqh_first =3D 0x0, tqh_last =
=3D=20
0xc25ebd08}, mtx_contested =3D {
le_next =3D 0x0, le_prev =3D 0x0}}}, if_poll_slowq =3D 0x0,=20
if_prefixhead =3D {tqh_first =3D 0x0,
tqh_last =3D 0xc25ebd1c}, if_broadcastaddr =3D 0xc0362fc0, if_label =
=3D=20
{l_flags =3D 0x1, l_perpolicy =3D {{
l_ptr =3D 0xc218b120, l_long =3D 0xc218b120}, {l_ptr =3D 0xc2605=
e80,=20
l_long =3D 0xc2605e80}, {
l_ptr =3D 0xc2605f00, l_long =3D 0xc2605f00}, {l_ptr =3D 0x0, l_=
long=20
=3D 0x0}}}}
(kgdb) p/x *mbuf
$5 =3D {m_hdr =3D {mh_next =3D 0x0, mh_nextpkt =3D 0x0, mh_data =3D 0xc0e=
e1854,=20
mh_len =3D 0x34, mh_flags =3D 0x2,
mh_type =3D 0x2}, M_dat =3D {MH =3D {MH_pkthdr =3D {rcvif =3D 0x0, l=
en =3D=20
0x34, header =3D 0x0, csum_flags =3D 0x0,
csum_data =3D 0x10, tags =3D {slh_first =3D 0x0}, label =3D {l_f=
lags =3D=20
0x1, l_perpolicy =3D {{
l_ptr =3D 0xbbefa5bb, l_long =3D 0xbbefa5bb}, {l_ptr =3D=20
0xc2e5c000, l_long =3D 0xc2e5c000}, {
l_ptr =3D 0xc3410580, l_long =3D 0xc3410580}, {l_ptr =3D 0=
x0,=20
l_long =3D 0x0}}}}, MH_dat =3D {MH_ext =3D {
ext_buf =3D 0xc138c000, ext_free =3D 0x0, ext_args =3D 0x0,=20
ext_size =3D 0x800, ref_cnt =3D 0x34001045,
ext_type =3D 0x6606}, MH_databuf =3D {0x0, 0xc0, 0x38, 0xc1, 0=
x0,=20
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x8, 0x0, 0x0, 0x45, 0x10, 0x0, 0x34, 0x6, 0x66, 0x0,=20
0x0, 0x40, 0x6, 0xa1, 0x93, 0xa, 0x0,
0x2, 0x6, 0xc0, 0xa8, 0x6, 0xd, 0xc0, 0x3, 0x0, 0x16, 0xd1,=20
0x2b, 0x3, 0xdc, 0xa0, 0x42, 0xca, 0xfe,
0x80, 0x10, 0x82, 0x17, 0x20, 0x46, 0x0, 0x0, 0x1, 0x1, 0x8,=20
0xa, 0x0, 0x36, 0xf9, 0x6f, 0x0, 0x95,
0x7, 0x7, 0x1, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x3c, 0x83, =
0xe, 0x29, 0xc, 0x0, 0x0, 0x0, 0x0,
0x8, 0x0, 0x0, 0x48, 0xf2, 0xbf, 0xbf, 0xa1, 0x92, 0xd, 0x29, =
0x4, 0x0, 0xe0, 0x1, 0x62, 0x1, 0x0,
0x0, 0x3c, 0x32, 0x39, 0x3e, 0x46, 0x65, 0x62, 0x20, 0x32,=20
0x35, 0x20, 0x31, 0x34, 0x3a, 0x31, 0x31,
0x3a, 0x33, 0x37, 0x20, 0x72, 0x6f, 0x6f, 0x74, 0x3a, 0x20,=20
0x2f, 0x64, 0x65, 0x76, 0x2f, 0x61,
0x64, 0x30, 0x73, 0x32, 0x67, 0x3a, 0x20, 0x55, 0x4e, 0x52,=20
0x45, 0x46, 0x20, 0x46, 0x49, 0x4c,
0x45, 0x20, 0x49, 0x3d, 0x31, 0x36, 0x35, 0x35, 0x34, 0x36,=20
0x20, 0x20, 0x4f, 0x57, 0x4e, 0x45,
0x52, 0x3d, 0x64, 0x63, 0x73, 0x20, 0x4d, 0x4f, 0x44, 0x45,=20
0x3d, 0x31, 0x30, 0x30, 0x36, 0x30,
0x30, 0xa, 0x0, 0x0}}}, M_databuf =3D {0x0, 0x0, 0x0, 0x0,=20
0x34, 0x0 <repeats 11 times>, 0x10, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0xbb, 0xa5,=20
0xef, 0xbb, 0x0, 0xc0, 0xe5, 0xc2, 0x80,
0x5, 0x41, 0xc3, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0, 0x38, 0xc1, 0x0,=20
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x8, 0x0, 0x0, 0x45, 0x10, 0x0, 0x34,obol.
Please modify your programs accordingly.
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