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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Joerg Reuter , Ralf Baechle , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , Roopa Prabhu , Nikolay Aleksandrov , Alexander Aring , Stefan Schmidt , Miquel Raynal , Steffen Klassert , Herbert Xu , Matthieu Baerts , Mat Martineau , Simon Horman , Julian Anastasov , Remi Denis-Courmont , Santosh Shilimkar , David Howells , Marc Dionne , Neil Horman , Marcelo Ricardo Leitner , Xin Long , Karsten Graul , Wenjia Zhang , Jan Karcher , Jon Maloy , Ying Xue , Martin Schiller , , , , , , , , , , , , , , , , , Subject: Re: [PATCH 06/11] sysctl: Add size to register_net_sysctl function Message-ID: <20230621120324.cl2admxrku7ilecm@localhost> MIME-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="je5dyz423x2mm343" Content-Disposition: inline In-Reply-To: <5aba7eee-7a6e-4f3b-9921-e4220d479346@kadam.mountain> X-Originating-IP: [106.210.248.248] X-ClientProxiedBy: CAMSVWEXC01.scsc.local (2002:6a01:e347::6a01:e347) To CAMSVWEXC02.scsc.local (2002:6a01:e348::6a01:e348) X-Brightmail-Tracker: H4sIAAAAAAAAA2WTaVBTZxSG+917kxuwkUu05RuX1qJoq6h1rPV0rFtHO7dl2tH+YNpilwi3 LtWgiViXsYKJpZKCkbQgIWAEgSARZEtVEDGUEJZJqKJgxC2CKAJSQ6zYBku42DrTf895z3m/ c94fn4iUdNMTRBtk2zi5TLopWOhPma2D9tkBXclRb+arACyxC8FmukqD93Q8Ce5bXQLoz9xP g96hosDbqhZC376/KCg8s5+ATquLBnNiAQJ19yRQlnsQdBx0CaAlt18IaYdtCG54XBQMJo2B tAQlAQ9S0gloNicJ4OcnOSRoGubB5V+vEXDxjF4IdyyJFGiOKknoNNwXQLs2l4Lqs0cQuIoe EKA88pAEpfs2CU+MdQKwJz4lwdh0h4A2TSeCmvgqATQV7aPhUaaNBKvhZdAUNlDgVNYL4VFj D4LUnkskXKicBg0DTwmwl7oF4Na/Drc0Dgq0xjICKg48pqHMsRHimsw03G5tJZctZJ0uD8n2 2esRm2nazT4ZnMmW5V8hWPVv3SR7WneNZs3VIayhJIYtOX5AyLZfrhSytfknCFaTVY3Y0mN7 WW1bHmLvlqahVVM+9383itu0YTsnn7vka//1Kqub3nJk9Y7s2Ho6FsUtT0B+Isy8hc+rYwUJ yF8kYYwI/16nJvhiAGF7ZS3JF26Ej9sOoWeWoqsFlI8lTB7CKaqX/h1SF3eNOsoRbjdeEvqm KCYE601e2sdCJhQ7etpJH48f5iGvlvIZSKY4AN8/c2VkxTgmDPfHpoyYxcxCnG1sFPAciOvT OkZWk8wO3Nh8YfhR0TBPxHlDIp/sx7yHE4ayCP7Sqbi1KlvI8x7cUOYcyYYZ3Yu4XTNE8o0V 2K7sFPA8DnfXldE8T8KN2p8o3qBF+NxQP80XBQjnxnlGVyzCqpaOUcdyvM+bRfouwsxY3NYb yB86FiebU0dlMf7xBwk/PR0XXO+hNGiq7rlouuei6f6Lxsuh2FDxUPg/eRbOPXqf5HkxLix8 QBkQfRwFcTGKzes4xXwZ990chXSzIka2bk5k9OYSNPwFG4fqPKeQsfuPORZEiJAFTRs2u04W NKMJlCxaxgWPF08uSY6SiKOkO3dx8uiv5DGbOIUFTRRRwUHiWYvrIyXMOuk27luO28LJn3UJ kd+EWCLx2Pf3OgTfOHsLBg/XPXbsX/H++RBJQMj4Mdu5+erUyvCNq0gP+vK1vKXpb9huNC/I vElFBIW/Y33bzzT3lx4mSFpVQ1BFM0pnqD/1ZohyFzSHHhLB3SUZe3qXJZ0YU6vbNXtStr0p 4UPB0shTN4tDZVktyRfvXepqNk936Hp2hjNma4S+RdgX1rvyujh76w5sy4lImRxhyKqm1u6O 11cqukrDzmUEWNJj2hb5l7yyrOKDor6cm+VfrHKbIj6KVn/y5/y/nWFxU/KDxY3Fe1VnSzYc vHtwwaPa8hdUa67nmOrDHLUfO+NXnFzz2daBwJWei8k1Jqv3ctrSzNy1leGvam2rAyXBlGK9 dN5MUq6Q/gOuFxqq/QQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA2WTeUxUVxTGc997s0ClTgHbF4qpGbW1iCPDesANG6vPNI3FNqmlWhzlCbQw 4AwQlFqRgbDrAFOEYRUKDjAFWZVFi4DsBWMrIAMah60sZSk7MtCBaVOT/ve73/nOd05ucti4 YRjLhO0h9KVFQoEnl6lPtK429u3ZPBznahGTbgS1QXbQpFSxQFMRhsPMy2EGTKWFsiClI4QA TVcUEyaCXxFQUBmKwWCDmgXlMfkIokZNQVI2h2DghpoBv+dMMSEpsQnBizk1AUvX34CkSAkG kwnJGDwuv84A2XI2DtIWPnTe7cPgt8oUJgzVxhAgvSXBYTBjjAG98TkE1NxPR6AunMRAkv4X DpKZfhyWFY0MaI9Zw0HRNoRBt3QQQV3YAwa0FQazYD6tCYeGjLdBWtBCQI+kmQnzreMIbo4/ xeFJ9Q5omV3DoL1khgEzKbvgpbSDgHhFKQZVEYssKO34Fq61lbOgv6sLd7SjetRzODXR3oyo NGUgtbxkRpXmPsOoqPpRnKqQ97Go8pqdVEaxH1WcF8GkejurmdSj3J8xSppZg6iSn65S8d23 EfVHSRL6bJszb7/I28+X3ubuLfY9wP2aD5Y8vj3wLK3teXwruzMOljbcvQf3u9KeHv60aO/B szz3lepUlk+qU8DzRSUjCK05RiI9NsmxJgtV+UQk0mcbcrIR2Vq0ROgKpmTR7FOGjo3Ilc5I ps40jcjE+rv/PMoQmdyYjq+7CM5OMkWpYa0zk2NOdoz3bujGWl7VxG+MwDlFm8nxaOXGCCPO J+RUUAJznQ04dmSWopWhSy3ByMX2PzFd4S2yOWlgowHn+JMrqVKtia3ld8nbq+x1WY/zERm5 monpVt1Odj3IYur4CjmjGUJSZCR/LUn+WpL8vySdbEZ2r45g/5N3kzm3xnAdHyALCiaJDMTK Q8a0n9jLzUvM54kFXmI/oRvvvLdXMdJeQXnDUsk9lDY6zatFGBvVoh3aTvWd/MfIhBB6C2mu scHW4jhXQwNXwaXLtMjbReTnSYtrkY32G2Nxky3nvbUnJfR14dta2PCtbe0tbOxtrbjvGBz3 CRcYctwEvvR3NO1Di/7tw9h6JkGYUraWWcbJjksWygOvvbiYbXa00HxZ7xzuiG0VfPl8/ljZ p0myYYPhNx1ORs9dPb1wwZl2jp1wSntSdXSfbKwo49QHoydufv+DwoXKyx25f655pX5gu9Px qdGkaNmNTd8kmF+qyBP0q6ot3VxPvwe4/i7VRQ+72KIFh4Ue4S+D4QGWuUt1XAV3LtFlpdP4 w/DA5ODiKy3dASGiQ1Uhn0ccqfQ/+/6zrPm+6cVDNWcO3/tY9jBo/thD10R986k9s6FfjJLW r0Ymuo3Zl+f8fy3TUFamyqKUlFM/suvrdnes7ev8KmfyxCOZ15GIDlOJmTJDvoW609TeoqIa GIc3yS+UqU8KVJNcQuwu4JvhIrHgb+hkHU2aBAAA X-CMS-MailID: 20230621120327eucas1p1c148cfc468823fbd592e0f24992d7b74 X-Msg-Generator: CA X-RootMTR: 20230621091022eucas1p1c097da50842b23e902e1a674e117e1aa X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20230621091022eucas1p1c097da50842b23e902e1a674e117e1aa References: <20230621091000.424843-1-j.granados@samsung.com> <20230621091000.424843-7-j.granados@samsung.com> <5aba7eee-7a6e-4f3b-9921-e4220d479346@kadam.mountain> Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org --je5dyz423x2mm343 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hey Dan On Wed, Jun 21, 2023 at 01:23:52PM +0300, Dan Carpenter wrote: > On Wed, Jun 21, 2023 at 12:47:30PM +0300, Dan Carpenter wrote: > > The patchset doesn't include the actual interesting changes, just a > > bunch of mechanical prep work. > >=20 > > On Wed, Jun 21, 2023 at 11:09:55AM +0200, Joel Granados wrote: > > > diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lo= wpan/reassembly.c > > > index a91283d1e5bf..7b717434368c 100644 > > > --- a/net/ieee802154/6lowpan/reassembly.c > > > +++ b/net/ieee802154/6lowpan/reassembly.c > > > @@ -379,7 +379,8 @@ static int __net_init lowpan_frags_ns_sysctl_regi= ster(struct net *net) > > > table[1].extra2 =3D &ieee802154_lowpan->fqdir->high_thresh; > > > table[2].data =3D &ieee802154_lowpan->fqdir->timeout; > > > =20 > > > - hdr =3D register_net_sysctl(net, "net/ieee802154/6lowpan", table); > > > + hdr =3D register_net_sysctl(net, "net/ieee802154/6lowpan", table, > > > + ARRAY_SIZE(lowpan_frags_ns_ctl_table)); > >=20 > > For example, in lowpan_frags_ns_sysctl_register() the sentinel is > > sometimes element zero if the user doesn't have enough permissions. I > > would want to ensure that was handled correctly, but that's going to be > > done later in a completely different patchset. I'm definitely not going > > to remember to check. >=20 > On reflecting the patch is obviously wrong. It should be pass zero as > table_size in that case. See diff at the end. yes >=20 > There is a similar bug in neigh_sysctl_register() where we use memset to > zero out the whole table. And another in __ip_vs_lblc_init(). I used > the smatch cross function database > `smdb.py where ctl_table procname | grep '(null)' | grep min-max` > to make a list of functions which set procname to zero. Awesome. That is homework on my part for V2. It gives me a way forward. Thx!!! >=20 > Probably we should add a WARN_ON() if procname is zero in the new code > which doesn't use sentinels. Yes >=20 > regards, > dan carpenter >=20 > drivers/char/random.c | proc_do_uuid | (struct= ctl_table)->procname | 0 > fs/proc/proc_sysctl.c | new_dir | (struct= ctl_table)->procname | 48,3906148897379000352 > fs/proc/proc_sysctl.c | new_links | (struct= ctl_table)->procname | 4096-ptr_max > arch/arm64/kernel/fpsimd.c | vec_proc_do_default_vl | (struct= ctl_table)->procname | 0 > arch/arm64/kernel/armv8_deprecated.c | register_insn_emulation | (= struct ctl_table)->procname | 0-u64max > kernel/sysctl-test.c | sysctl_test_api_dointvec_null_tbl_data |= (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_api_dointvec_table_maxlen_un= set | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_api_dointvec_table_len_is_ze= ro | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_api_dointvec_table_read_but_= position_set | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_dointvec_read_happy_single_p= ositive | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_dointvec_read_happy_single_n= egative | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_dointvec_write_happy_single_= positive | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_dointvec_write_happy_single_= negative | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_api_dointvec_write_single_le= ss_int_min | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl-test.c | sysctl_test_api_dointvec_write_single_gr= eater_int_max | (struct ctl_table)->procname | 7612622206476333056 > kernel/sysctl.c | proc_do_static_key | (struct= ctl_table)->procname | 0 > kernel/kexec_core.c | kexec_limit_handler | (struct= ctl_table)->procname | 0 > kernel/bpf/syscall.c | bpf_stats_handler | (struct= ctl_table)->procname | 0 > net/core/sysctl_net_core.c | rps_sock_flow_sysctl | (struct= ctl_table)->procname | 0 > net/core/sysctl_net_core.c | set_default_qdisc | (struct= ctl_table)->procname | 0 > net/core/neighbour.c | neigh_sysctl_register | (struct= ctl_table)->procname | 0 > net/netfilter/ipvs/ip_vs_lblc.c | __ip_vs_lblc_init | (struc= t ctl_table)->procname | 0-u64max > net/netfilter/ipvs/ip_vs_lblcr.c | __ip_vs_lblcr_init | (stru= ct ctl_table)->procname | 0-u64max > net/netfilter/ipvs/ip_vs_ctl.c | proc_do_defense_mode | (struct= ctl_table)->procname | 0 > net/netfilter/ipvs/ip_vs_ctl.c | proc_do_sync_threshold | (struct= ctl_table)->procname | 0 > net/netfilter/ipvs/ip_vs_ctl.c | proc_do_sync_ports | (struct= ctl_table)->procname | 0 > net/netfilter/ipvs/ip_vs_ctl.c | ipvs_proc_est_nice | (struct= ctl_table)->procname | 0 > net/netfilter/ipvs/ip_vs_ctl.c | ipvs_proc_run_estimation | (struct= ctl_table)->procname | 0 > net/netfilter/ipvs/ip_vs_ctl.c | ip_vs_control_net_init_sysctl | (struct= ctl_table)->procname | 0-u64max > net/netfilter/nf_log.c | netfilter_log_sysctl_init | (struct= ctl_table)->procname | 0-u64max > net/sctp/sysctl.c | proc_sctp_do_hmac_alg | (struct= ctl_table)->procname | 0 > net/sctp/sysctl.c | proc_sctp_do_rto_min | (struct= ctl_table)->procname | 0 > net/sctp/sysctl.c | proc_sctp_do_rto_max | (struct= ctl_table)->procname | 0 > net/sctp/sysctl.c | proc_sctp_do_auth | (struct= ctl_table)->procname | 0 > net/sctp/sysctl.c | proc_sctp_do_udp_port | (struct= ctl_table)->procname | 0 > net/sctp/sysctl.c | proc_sctp_do_probe_interval | (struct= ctl_table)->procname | 0 > net/ipv6/route.c | ipv6_route_sysctl_init | (struct= ctl_table)->procname | 0-u64max > net/ipv6/addrconf.c | addrconf_sysctl_addr_gen_mode | (struct= ctl_table)->procname | 0 > net/ieee802154/6lowpan/reassembly.c | lowpan_frags_ns_sysctl_register | (= struct ctl_table)->procname | 0-u64max > net/xfrm/xfrm_sysctl.c | xfrm_sysctl_init | (struct= ctl_table)->procname | 0-u64max > net/phonet/sysctl.c | proc_local_port_range | (struct= ctl_table)->procname | 0 > net/ipv4/route.c | sysctl_route_net_init | (struct= ctl_table)->procname | 0-u64max > net/ipv4/sysctl_net_ipv4.c | ipv4_local_port_range | (struct= ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | ipv4_privileged_ports | (struct= ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | ipv4_ping_group_range | (struct= ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | proc_tcp_congestion_control | (struct= ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | proc_tcp_available_congestion_control | = (struct ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | proc_allowed_congestion_control | (struc= t ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | proc_tcp_fastopen_key | (struct= ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | proc_tcp_available_ulp | (struct= ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | proc_tcp_ehash_entries | (struct= ctl_table)->procname | 0 > net/ipv4/sysctl_net_ipv4.c | proc_udp_hash_entries | (struct= ctl_table)->procname | 0 >=20 > diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan= /reassembly.c > index a91283d1e5bf..749238d38014 100644 > --- a/net/ieee802154/6lowpan/reassembly.c > +++ b/net/ieee802154/6lowpan/reassembly.c > @@ -360,6 +360,7 @@ static int __net_init lowpan_frags_ns_sysctl_register= (struct net *net) > struct ctl_table_header *hdr; > struct netns_ieee802154_lowpan *ieee802154_lowpan =3D > net_ieee802154_lowpan(net); > + size_t table_size =3D ARRAY_SIZE(lowpan_frags_ns_ctl_table); > =20 > table =3D lowpan_frags_ns_ctl_table; > if (!net_eq(net, &init_net)) { > @@ -369,8 +370,10 @@ static int __net_init lowpan_frags_ns_sysctl_registe= r(struct net *net) > goto err_alloc; > =20 > /* Don't export sysctls to unprivileged users */ > - if (net->user_ns !=3D &init_user_ns) > + if (net->user_ns !=3D &init_user_ns) { > table[0].procname =3D NULL; > + table_size =3D 0; > + } > } > =20 > table[0].data =3D &ieee802154_lowpan->fqdir->high_thresh; > @@ -379,7 +382,7 @@ static int __net_init lowpan_frags_ns_sysctl_register= (struct net *net) > table[1].extra2 =3D &ieee802154_lowpan->fqdir->high_thresh; > table[2].data =3D &ieee802154_lowpan->fqdir->timeout; > =20 > - hdr =3D register_net_sysctl(net, "net/ieee802154/6lowpan", table); > + hdr =3D register_net_sysctl(net, "net/ieee802154/6lowpan", table, table= _size); > if (hdr =3D=3D NULL) > goto err_reg; > =20 --=20 Joel Granados --je5dyz423x2mm343 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGzBAABCgAdFiEErkcJVyXmMSXOyyeQupfNUreWQU8FAmSS5wsACgkQupfNUreW QU9ERQwAgEMy70wE4h18ynQTGRx76Q41zwefjWXFjEGR0K3NIsFmJQ0zHEbUM4QJ IAZlo1uMboPLnI3bAsabEclKxOWcFy09FHUrVxLBEA2W6++zEHwohyoCKbOTxX47 T8PRYwwPkowWc4cF1iRrHsJlBU9xPYDzNpwFIM/hx/OFxPgcs4jpLZPN9i49q0Lx ikkO54H2IHbPeRQb65JbXwFqG4KwDDJw3Y4pdmItfiqSuRqTmAS+9yLSOqnMn6Nc 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