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Message-Id: <1484730707-29313-1-git-send-email-elena.reshetova@intel.com> Date: Wed, 18 Jan 2017 11:11:29 +0200 From: Elena Reshetova <elena.reshetova@...el.com> To: kernel-hardening@...ts.openwall.com Cc: keescook@...omium.org, arnd@...db.de, tglx@...utronix.de, mingo@...hat.com, h.peter.anvin@...el.com, peterz@...radead.org, will.deacon@....com, dwindsor@...il.com, gregkh@...uxfoundation.org, Elena Reshetova <elena.reshetova@...el.com> Subject: [RFCv2 PATCH 00/18] refcount_t API + usage Changes since v1: - kref INIT fixes are moved to a proper separate commit - Peter's commits are now properly integrated into series - various small fixes are incorporated based on testing results and feedback This patch series is build on top of Peter's Zijlstra patches that provide refcount_t type and API definition. The rest of patches convert various places of kernel subsystems where atomic_t was used for reference counting to new refcount_t type and API. By doing this, we make sure that underflows and overflows cannot occur in these places and therefore no use-after-free situation can be created and misused by an attacker. The patches still have a number of rough places, where we especially would need a feedback. The patches also do not cover absolutely all cases where atomic_t is used as refcounter. The more complex places are left for the future patch series and their occurences are documented in https://docs.google.com/document/d/1Gw-SQoxJ3RAofGrkEm7qEyTC48mst3svVjxnVKXyGPs/edit?usp=sharing The automatic finding of atomic_t variables used as refcounters was done using Coccinelle (http://coccinelle.lip6.fr/). We thank Julia Lawall for helping us to get started on this! Testing and compilation status: - Compiles on x86, boots to GUI, no warns in the log - Compiles for arm (defconfig, imx_v6_v7_defconfig), but cannot test The patches are on top of linux-4.10-rc2. Patches would greatly benefit from compile proof test and runtime tests on all arches because of extensive changes. Elena Reshetova (11): kernel, mm: convert from atomic_t to refcount_t net: convert from atomic_t to refcount_t fs: convert from atomic_t to refcount_t security: convert from atomic_t to refcount_t sound: convert from atomic_t to refcount_t ipc: covert from atomic_t to refcount_t tools: convert from atomic_t to refcount_t block: convert from atomic_t to refcount_t drivers: net convert from atomic_t to refcount_t drivers: misc drivers convert from atomic_t to refcount_t drivers: infiniband convert from atomic_t to refcount_t Peter Zijlstra (7): kref: Add KREF_INIT() kref: Add kref_read() kref: Kill kref_sub() kref: Use kref_get_unless_zero() more kref: Implement kref_put_lock() kref: Avoid more abuse kref: Implement using refcount_t arch/alpha/kernel/smp.c | 6 +- arch/arc/kernel/smp.c | 2 +- arch/arc/mm/tlb.c | 2 +- arch/arm/kernel/smp.c | 2 +- arch/arm64/kernel/smp.c | 2 +- arch/blackfin/mach-common/smp.c | 4 +- arch/frv/mm/mmu-context.c | 2 +- arch/ia64/include/asm/tlbflush.h | 2 +- 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+- include/linux/ceph/osd_client.h | 3 +- include/linux/ceph/pagelist.h | 6 +- include/linux/cgroup-defs.h | 3 +- include/linux/cgroup.h | 7 +- include/linux/connector.h | 4 +- include/linux/cred.h | 13 +- include/linux/filter.h | 3 +- include/linux/fs.h | 3 +- include/linux/fscache-cache.h | 7 +- include/linux/fsnotify_backend.h | 5 +- include/linux/igmp.h | 3 +- include/linux/inetdevice.h | 11 +- include/linux/init_task.h | 7 +- include/linux/iocontext.h | 7 +- include/linux/ipc_namespace.h | 5 +- include/linux/kernfs.h | 3 +- include/linux/key.h | 5 +- include/linux/kref.h | 73 +++--- include/linux/kvm_host.h | 3 +- include/linux/lockd/lockd.h | 9 +- include/linux/mbcache.h | 6 +- include/linux/mlx4/device.h | 8 +- include/linux/mlx5/cq.h | 4 +- include/linux/mlx5/driver.h | 5 +- include/linux/mm_types.h | 5 +- include/linux/netpoll.h | 3 +- include/linux/nfs_fs.h | 3 +- include/linux/nfs_fs_sb.h | 5 +- include/linux/nsproxy.h | 6 +- include/linux/perf_event.h | 3 +- include/linux/posix_acl.h | 7 +- include/linux/refcount.h | 262 +++++++++++++++++++++ include/linux/rmap.h | 7 +- include/linux/sched.h | 25 +- include/linux/skbuff.h | 23 +- include/linux/sunrpc/auth.h | 8 +- include/linux/sunrpc/auth_gss.h | 3 +- include/linux/sunrpc/cache.h | 2 +- include/media/videobuf2-memops.h | 3 +- include/net/addrconf.h | 14 +- include/net/af_unix.h | 3 +- include/net/arp.h | 2 +- include/net/ax25.h | 20 +- include/net/bluetooth/hci_core.h | 14 +- include/net/bluetooth/rfcomm.h | 8 +- include/net/calipso.h | 4 +- include/net/cipso_ipv4.h | 3 +- include/net/dn_fib.h | 5 +- include/net/fib_rules.h | 7 +- include/net/if_inet6.h | 9 +- include/net/inet_frag.h | 4 +- include/net/inet_hashtables.h | 4 +- include/net/inetpeer.h | 4 +- include/net/ip_fib.h | 7 +- include/net/ip_vs.h | 24 +- include/net/ipv6.h | 7 +- include/net/ipx.h | 13 +- include/net/lapb.h | 3 +- include/net/lib80211.h | 2 +- include/net/llc.h | 6 +- include/net/lwtunnel.h | 7 +- include/net/ndisc.h | 2 +- include/net/neighbour.h | 15 +- include/net/net_namespace.h | 3 +- include/net/netfilter/br_netfilter.h | 2 +- include/net/netfilter/nf_conntrack_expect.h | 4 +- include/net/netfilter/nf_conntrack_timeout.h | 3 +- include/net/netlabel.h | 8 +- include/net/netrom.h | 13 +- include/net/request_sock.h | 9 +- include/net/sch_generic.h | 3 +- include/net/sctp/auth.h | 5 +- include/net/sctp/structs.h | 8 +- include/net/sock.h | 25 +- include/net/vxlan.h | 2 +- include/net/x25.h | 15 +- include/net/xfrm.h | 21 +- include/rdma/ib_addr.h | 3 +- include/rdma/ib_verbs.h | 15 +- include/rdma/rdmavt_mr.h | 6 +- include/rdma/rdmavt_qp.h | 6 +- include/scsi/libfc.h | 5 +- include/scsi/libiscsi.h | 3 +- include/trace/events/bcache.h | 2 +- include/trace/events/btrfs.h | 6 +- init/version.c | 4 +- ipc/msgutil.c | 2 +- ipc/namespace.c | 4 +- ipc/sem.c | 8 +- ipc/util.c | 6 +- ipc/util.h | 3 +- kernel/audit_tree.c | 10 +- kernel/audit_watch.c | 8 +- kernel/cgroup.c | 23 +- kernel/cred.c | 46 ++-- kernel/events/core.c | 16 +- kernel/events/internal.h | 5 +- kernel/events/ring_buffer.c | 8 +- kernel/events/uprobes.c | 13 +- kernel/exit.c | 4 +- kernel/fork.c | 40 ++-- kernel/futex.c | 17 +- kernel/groups.c | 2 +- kernel/kcov.c | 9 +- kernel/nsproxy.c | 6 +- kernel/pid.c | 4 +- kernel/sched/core.c | 7 +- kernel/sched/fair.c | 8 +- kernel/user.c | 8 +- lib/is_single_threaded.c | 2 +- mm/backing-dev.c | 11 +- mm/debug.c | 4 +- mm/huge_memory.c | 16 +- mm/init-mm.c | 4 +- mm/khugepaged.c | 4 +- mm/kmemleak.c | 16 +- mm/ksm.c | 4 +- mm/memory.c | 2 +- mm/mmu_context.c | 2 +- mm/mmu_notifier.c | 12 +- mm/mprotect.c | 2 +- mm/oom_kill.c | 6 +- mm/rmap.c | 14 +- mm/swapfile.c | 14 +- mm/vmacache.c | 2 +- mm/zpool.c | 4 +- net/atm/br2684.c | 2 +- net/atm/clip.c | 8 +- net/atm/common.c | 10 +- net/atm/lec.c | 11 +- net/atm/lec_arpc.h | 2 +- net/atm/mpc.c | 4 +- net/atm/mpoa_caches.c | 26 +- net/atm/mpoa_caches.h | 5 +- net/atm/pppoatm.c | 2 +- net/atm/proc.c | 4 +- net/atm/raw.c | 2 +- net/atm/resources.c | 2 +- net/atm/signaling.c | 2 +- net/ax25/af_ax25.c | 2 +- net/ax25/ax25_route.c | 2 +- net/ax25/ax25_uid.c | 2 +- net/bluetooth/6lowpan.c | 2 +- net/bluetooth/a2mp.c | 4 +- net/bluetooth/af_bluetooth.c | 2 +- net/bluetooth/amp.c | 4 +- net/bluetooth/hci_conn.c | 4 +- net/bluetooth/l2cap_core.c | 4 +- net/bluetooth/rfcomm/core.c | 4 +- net/bluetooth/rfcomm/sock.c | 2 +- net/bridge/br_netfilter_hooks.c | 4 +- net/bridge/br_private.h | 3 +- net/bridge/br_vlan.c | 8 +- net/caif/caif_socket.c | 2 +- net/ceph/messenger.c | 4 +- net/ceph/osd_client.c | 26 +- net/ceph/pagelist.c | 2 +- net/ceph/snapshot.c | 6 +- net/core/datagram.c | 10 +- net/core/dev.c | 10 +- net/core/dst.c | 7 +- net/core/fib_rules.c | 4 +- net/core/filter.c | 6 +- net/core/neighbour.c | 22 +- net/core/net-sysfs.c | 2 +- net/core/net_namespace.c | 4 +- net/core/netpoll.c | 10 +- net/core/pktgen.c | 16 +- net/core/rtnetlink.c | 2 +- net/core/skbuff.c | 34 +-- net/core/sock.c | 30 +-- net/dccp/ipv6.c | 2 +- net/decnet/dn_fib.c | 6 +- net/decnet/dn_neigh.c | 2 +- net/ipv4/af_inet.c | 2 +- net/ipv4/cipso_ipv4.c | 16 +- net/ipv4/devinet.c | 2 +- net/ipv4/fib_semantics.c | 2 +- net/ipv4/fib_trie.c | 2 +- net/ipv4/igmp.c | 10 +- net/ipv4/inet_connection_sock.c | 2 +- net/ipv4/inet_fragment.c | 14 +- net/ipv4/inet_hashtables.c | 4 +- net/ipv4/inet_timewait_sock.c | 8 +- net/ipv4/inetpeer.c | 18 +- net/ipv4/ip_fragment.c | 2 +- net/ipv4/ip_output.c | 6 +- net/ipv4/netfilter/ipt_CLUSTERIP.c | 19 +- net/ipv4/ping.c | 4 +- net/ipv4/raw.c | 2 +- net/ipv4/syncookies.c | 2 +- net/ipv4/tcp.c | 4 +- net/ipv4/tcp_fastopen.c | 2 +- net/ipv4/tcp_ipv4.c | 4 +- net/ipv4/tcp_offload.c | 2 +- net/ipv4/tcp_output.c | 13 +- net/ipv4/udp.c | 6 +- net/ipv4/udp_diag.c | 4 +- net/ipv6/addrconf.c | 4 +- net/ipv6/addrlabel.c | 9 +- net/ipv6/anycast.c | 6 +- net/ipv6/calipso.c | 16 +- net/ipv6/datagram.c | 2 +- net/ipv6/exthdrs.c | 4 +- net/ipv6/inet6_hashtables.c | 4 +- net/ipv6/ip6_output.c | 4 +- net/ipv6/ipv6_sockglue.c | 2 +- net/ipv6/mcast.c | 18 +- net/ipv6/syncookies.c | 2 +- net/ipv6/tcp_ipv6.c | 6 +- net/ipv6/udp.c | 2 +- net/ipv6/xfrm6_input.c | 2 +- net/ipv6/xfrm6_tunnel.c | 8 +- net/ipx/af_ipx.c | 6 +- net/ipx/ipx_proc.c | 2 +- net/ipx/ipx_route.c | 2 +- net/kcm/kcmproc.c | 2 +- net/key/af_key.c | 10 +- net/l2tp/l2tp_core.c | 12 +- net/l2tp/l2tp_core.h | 13 +- net/l2tp/l2tp_debugfs.c | 6 +- net/l2tp/l2tp_ppp.c | 2 +- net/lapb/lapb_iface.c | 6 +- net/llc/llc_conn.c | 8 +- net/llc/llc_core.c | 2 +- net/llc/llc_sap.c | 2 +- net/netfilter/ipset/ip_set_hash_gen.h | 19 +- net/netfilter/ipvs/ip_vs_conn.c | 24 +- net/netfilter/ipvs/ip_vs_core.c | 4 +- net/netfilter/ipvs/ip_vs_ctl.c | 24 +- net/netfilter/ipvs/ip_vs_dh.c | 2 +- net/netfilter/ipvs/ip_vs_fo.c | 2 +- net/netfilter/ipvs/ip_vs_lblc.c | 4 +- net/netfilter/ipvs/ip_vs_lblcr.c | 8 +- net/netfilter/ipvs/ip_vs_lc.c | 2 +- net/netfilter/ipvs/ip_vs_nq.c | 4 +- net/netfilter/ipvs/ip_vs_ovf.c | 2 +- net/netfilter/ipvs/ip_vs_pe_sip.c | 2 +- net/netfilter/ipvs/ip_vs_proto_sctp.c | 2 +- net/netfilter/ipvs/ip_vs_proto_tcp.c | 2 +- net/netfilter/ipvs/ip_vs_rr.c | 4 +- net/netfilter/ipvs/ip_vs_sed.c | 4 +- net/netfilter/ipvs/ip_vs_sh.c | 2 +- net/netfilter/ipvs/ip_vs_wlc.c | 4 +- net/netfilter/ipvs/ip_vs_wrr.c | 4 +- net/netfilter/nf_conntrack_core.c | 26 +- net/netfilter/nf_conntrack_expect.c | 12 +- net/netfilter/nf_conntrack_netlink.c | 10 +- net/netfilter/nf_conntrack_standalone.c | 4 +- net/netfilter/nfnetlink_acct.c | 15 +- net/netfilter/nfnetlink_cttimeout.c | 12 +- net/netfilter/nfnetlink_log.c | 14 +- net/netfilter/nft_ct.c | 2 +- net/netfilter/xt_CT.c | 2 +- net/netfilter/xt_TPROXY.c | 4 +- net/netlink/af_netlink.c | 14 +- net/netrom/nr_route.c | 6 +- net/packet/af_packet.c | 14 +- net/packet/internal.h | 4 +- net/phonet/socket.c | 4 +- net/rds/ib.c | 12 +- net/rds/ib.h | 2 +- net/rds/ib_rdma.c | 4 +- net/rds/message.c | 12 +- net/rds/rdma.c | 10 +- net/rds/rds.h | 9 +- net/rds/recv.c | 12 +- net/rds/tcp_send.c | 2 +- net/rxrpc/af_rxrpc.c | 6 +- net/rxrpc/skbuff.c | 12 +- net/sched/em_meta.c | 2 +- net/sched/sch_api.c | 8 +- net/sched/sch_atm.c | 2 +- net/sched/sch_generic.c | 8 +- net/sctp/associola.c | 6 +- net/sctp/auth.c | 4 +- net/sctp/chunk.c | 6 +- net/sctp/endpointola.c | 6 +- net/sctp/output.c | 2 +- net/sctp/outqueue.c | 2 +- net/sctp/proc.c | 2 +- net/sctp/sm_make_chunk.c | 6 +- net/sctp/socket.c | 6 +- net/sctp/transport.c | 8 +- net/sunrpc/auth.c | 12 +- net/sunrpc/auth_gss/auth_gss.c | 29 +-- net/sunrpc/auth_null.c | 2 +- net/sunrpc/cache.c | 2 +- net/sunrpc/svc_xprt.c | 6 +- net/sunrpc/svcauth.c | 15 +- net/sunrpc/xprtrdma/svc_rdma_transport.c | 4 +- net/tipc/socket.c | 2 +- net/unix/af_unix.c | 16 +- net/wireless/lib80211.c | 2 +- net/x25/x25_link.c | 2 +- net/x25/x25_route.c | 2 +- net/xfrm/xfrm_input.c | 4 +- net/xfrm/xfrm_policy.c | 4 +- net/xfrm/xfrm_state.c | 4 +- security/apparmor/include/apparmor.h | 6 - security/apparmor/include/policy.h | 4 +- security/keys/gc.c | 2 +- security/keys/internal.h | 3 +- security/keys/key.c | 12 +- security/keys/keyring.c | 8 +- security/keys/proc.c | 4 +- security/keys/process_keys.c | 2 +- security/keys/request_key_auth.c | 2 +- security/selinux/hooks.c | 9 +- security/selinux/include/xfrm.h | 5 +- security/selinux/xfrm.c | 11 +- security/tomoyo/common.c | 11 +- sound/core/seq/seq_clientmgr.c | 2 +- sound/core/seq/seq_ports.c | 8 +- sound/core/seq/seq_ports.h | 3 +- sound/usb/card.c | 10 +- sound/usb/usbaudio.h | 4 +- tools/perf/util/cgroup.c | 6 +- tools/perf/util/cgroup.h | 4 +- tools/perf/util/comm.c | 10 +- tools/perf/util/cpumap.c | 16 +- tools/perf/util/cpumap.h | 4 +- tools/perf/util/dso.c | 6 +- tools/perf/util/dso.h | 4 +- tools/perf/util/evlist.c | 18 +- tools/perf/util/evlist.h | 4 +- tools/perf/util/map.c | 10 +- tools/perf/util/map.h | 10 +- tools/perf/util/thread.c | 6 +- tools/perf/util/thread.h | 4 +- tools/perf/util/thread_map.c | 20 +- tools/perf/util/thread_map.h | 4 +- virt/kvm/async_pf.c | 2 +- virt/kvm/kvm_main.c | 10 +- 709 files changed, 3279 insertions(+), 2898 deletions(-) create mode 100644 include/linux/refcount.h -- 2.7.4
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