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Date: Thu, 20 Oct 2016 16:13:50 +0300
From: Hans Liljestrand <ishkamiel@...il.com>
To: kernel-hardening@...ts.openwall.com
Cc: keescook@...omium.org, Elena Reshetova <elena.reshetova@...el.com>
Subject: Re: [RFC v2 PATCH 00/13] HARDENED_ATOMIC
On Thu, Oct 20, 2016 at 01:25:18PM +0300, Elena Reshetova wrote:
> Changes since RFC v1:
>
> - documentation added: Documentation/security/hardened-atomic.txt
> - percpu-refcount diversion from PaX/Grsecurity explained better
> - arch. independent base has full functional coverage for atomic,
> atomic-long and atomic64 types.
> - arch. independent base is better structured and organized
> - lkdtm: tests are now defined using macros
> - x86 implementation added for missing functions
> - fixed trap handling on x86 and overall reporting
> - many small polishing and fixes
>
> Open items:
>
> - performance measurements: we are still waiting for numbers
> - arch. independent implementation doesn't have coverage for
> local_wrap_t type in cases when include/asm-generic/local.h
> is not used (meaning architecture does provide its implementation
> but does not yet provide *_wrap functions). We haven't yet
> find a nice way of doing it in arch. independent definitions,
> since some kernel code includes asm/local.h directly and we
> are not sure where to place new definitions (new file under
> inlcude/linux/local_wrap.h (to be inline with include/linux/
> atomic.h) + definition of local_wrap_t to include/linux/types.h?)
> Ideas and suggestions on this are very warlmy welcomed!
>
> Compilation and testing results:
>
> - CONFIG_HARDENED_ATOMIC=y, arch=x86_64 or x86_32, full x86 coverage implementation: compiles, lkdtm atomic tests PASS
> - CONFIG_HARDENED_ATOMIC=n, arch=x86_64 or x86_32, full x86 coverage implementation: compiles, feature not enabled, so tests not run
> - CONFIG_HARDENED_ATOMIC=n, arch=x86_64 or x86_32, with x86 hardening implementation removed
> (simulate not implemented for arch. case): compile does not yet pass due to issues with local_wrap_t decribed above
As noted our current implementation fails on local_t without arch support (at
least in kernel/trace/ring_buffer.c where local_wrap_t is used). It seems that
local_t is almost never used, which is also what the related documentation
recommends (at Documentation/local_ops.txt). I would be inclined to drop local_t
support and switch the generic implementation to use atomic_long_wrap_t instead
of atomic_long_t.
So my question is then, do we actually want to provide a protected version of
local_t, or can we just drop this support?
>
> This series brings the PaX/Grsecurity PAX_REFCOUNT
> feature support to the upstream kernel. All credit for the
> feature goes to the feature authors.
>
> The name of the upstream feature is HARDENED_ATOMIC
> and it is configured using CONFIG_HARDENED_ATOMIC and
> HAVE_ARCH_HARDENED_ATOMIC.
>
> This series only adds x86 support; other architectures are expected
> to add similar support gradually.
I have some worries on the generic arch independent implementation of
atomic64_t/atomic64_wrap_t (include/asm-generic/atomic64.h). We provide _wrap
versions for atomic64, but protection is dependant on arch implementation and
config. That is, one could possibly implement HARDENED_ATOMIC support while
leaving atomic64_t unprotected depending on specific configs, for instance by
then defaulting to CONFIG_GENERIC_ATOMIC64 (in linuc/hardened/atomic.h:676). Or
maybe I'm just under-/overthinking this?
My concern is that this is a very easy place to include errors and
inconsistencies. We've been trying to cleanly fix this, but haven't really found
a satisfactory solution (e.g. one that actually works on different configs/arcs
and isn't a horrible mess). I recall that the hardened_atomic ARM implementation
already faced issues with atomic64, so this seems to be a real cause for
problems. Any suggestions on how to do this more cleanly?
In contrast to local_t issue, atomic64_t is in fact directly used in several
places, including some that we patch to use atomic64_wrap_t. The atomic_(long)_t
implementation is also possibly intertwined with atomic64_t, so I doubt just
dropping bare atomic64_t protections is a viable solution.
On that note, our lkdtm test are still lacking atomic64 tests, which would
probably be good idea to add.
Best Regards,
-hans
>
> More information about the feature can be found in the following
> commit messages.
>
> Special thank you goes to Kees Cook for pre-reviwing this feature
> and all the valuable feedback he provided to us.
>
> David Windsor (7):
> kernel: identify wrapping atomic usage
> mm: identify wrapping atomic usage
> fs: identify wrapping atomic usage
> net: identify wrapping atomic usage
> security: identify wrapping atomic usage
> drivers: identify wrapping atomic usage (part 1/2)
> drivers: identify wrapping atomic usage (part 2/2)
>
> Elena Reshetova (2):
> Add architecture independent hardened atomic base
> x86: implementation for HARDENED_ATOMIC
>
> Hans Liljestrand (4):
> percpu-refcount: leave atomic counter unprotected
> net: atm: identify wrapping atomic usage
> x86: identify wrapping atomic usage
> lkdtm: add tests for atomic over-/underflow
>
> Documentation/security/hardened-atomic.txt | 141 +++++++++
> arch/x86/Kconfig | 1 +
> arch/x86/include/asm/atomic.h | 323 ++++++++++++++++++++-
> arch/x86/include/asm/atomic64_32.h | 201 ++++++++++++-
> arch/x86/include/asm/atomic64_64.h | 228 ++++++++++++++-
> arch/x86/include/asm/bitops.h | 8 +-
> arch/x86/include/asm/cmpxchg.h | 39 +++
> arch/x86/include/asm/hw_irq.h | 4 +-
> arch/x86/include/asm/local.h | 89 +++++-
> arch/x86/include/asm/preempt.h | 2 +-
> arch/x86/include/asm/rmwcc.h | 82 +++++-
> arch/x86/include/asm/rwsem.h | 50 ++++
> arch/x86/kernel/apic/apic.c | 2 +-
> arch/x86/kernel/apic/io_apic.c | 4 +-
> arch/x86/kernel/cpu/mcheck/mce.c | 12 +-
> arch/x86/kernel/i8259.c | 2 +-
> arch/x86/kernel/irq.c | 8 +-
> arch/x86/kernel/kgdb.c | 6 +-
> arch/x86/kernel/pvclock.c | 8 +-
> arch/x86/kernel/tboot.c | 8 +-
> arch/x86/kernel/traps.c | 4 +
> arch/x86/lib/atomic64_386_32.S | 135 +++++++++
> arch/x86/lib/atomic64_cx8_32.S | 78 ++++-
> arch/x86/mm/mmio-mod.c | 4 +-
> drivers/acpi/apei/ghes.c | 4 +-
> drivers/ata/libata-core.c | 5 +-
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> drivers/gpu/drm/qxl/qxl_irq.c | 16 +-
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> drivers/gpu/drm/r128/r128_irq.c | 4 +-
> drivers/gpu/drm/r128/r128_state.c | 4 +-
> drivers/gpu/drm/via/via_drv.h | 4 +-
> drivers/gpu/drm/via/via_irq.c | 18 +-
> drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 2 +-
> drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c | 6 +-
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> drivers/infiniband/hw/cxgb4/mem.c | 4 +-
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> drivers/infiniband/hw/nes/nes_cm.c | 62 ++--
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> drivers/infiniband/hw/nes/nes_verbs.c | 10 +-
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> drivers/md/dm-raid1.c | 18 +-
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> drivers/media/pci/ivtv/ivtv-driver.c | 2 +-
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> drivers/media/pci/solo6x10/solo6x10.h | 2 +-
> drivers/media/pci/tw68/tw68-core.c | 2 +-
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> drivers/misc/lis3lv02d/lis3lv02d.c | 8 +-
> drivers/misc/lis3lv02d/lis3lv02d.h | 2 +-
> drivers/misc/lkdtm.h | 17 ++
> drivers/misc/lkdtm_bugs.c | 122 ++++++--
> drivers/misc/lkdtm_core.c | 17 ++
> drivers/misc/sgi-gru/gruhandles.c | 4 +-
> drivers/misc/sgi-gru/gruprocfs.c | 8 +-
> drivers/misc/sgi-gru/grutables.h | 158 +++++-----
> drivers/net/hyperv/hyperv_net.h | 2 +-
> drivers/net/hyperv/rndis_filter.c | 4 +-
> drivers/net/ipvlan/ipvlan_core.c | 2 +-
> drivers/net/macvlan.c | 2 +-
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> drivers/usb/wusbcore/wa-xfer.c | 2 +-
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> drivers/video/fbdev/udlfb.c | 32 +--
> fs/afs/inode.c | 4 +-
> fs/btrfs/delayed-inode.c | 6 +-
> fs/btrfs/delayed-inode.h | 4 +-
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> fs/cifs/cifsfs.c | 4 +-
> fs/cifs/cifsglob.h | 55 ++--
> fs/cifs/misc.c | 4 +-
> fs/cifs/smb1ops.c | 80 +++---
> fs/cifs/smb2ops.c | 84 +++---
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> fs/coredump.c | 6 +-
> fs/ext4/ext4.h | 20 +-
> fs/ext4/mballoc.c | 44 +--
> fs/fscache/cookie.c | 40 +--
> fs/fscache/internal.h | 202 ++++++-------
> fs/fscache/object.c | 26 +-
> fs/fscache/operation.c | 38 +--
> fs/fscache/page.c | 110 +++----
> fs/fscache/stats.c | 348 +++++++++++------------
> fs/inode.c | 5 +-
> fs/kernfs/file.c | 12 +-
> fs/lockd/clntproc.c | 4 +-
> fs/namespace.c | 4 +-
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> fs/reiserfs/do_balan.c | 2 +-
> fs/reiserfs/procfs.c | 2 +-
> fs/reiserfs/reiserfs.h | 4 +-
> include/asm-generic/atomic-long.h | 264 ++++++++++++++---
> include/asm-generic/atomic.h | 56 ++++
> include/asm-generic/atomic64.h | 13 +
> include/asm-generic/bug.h | 7 +
> include/asm-generic/local.h | 15 +
> include/linux/atmdev.h | 2 +-
> include/linux/atomic.h | 114 ++++++++
> include/linux/blktrace_api.h | 2 +-
> include/linux/fscache-cache.h | 2 +-
> include/linux/genhd.h | 2 +-
> include/linux/irqdesc.h | 2 +-
> include/linux/kgdb.h | 2 +-
> include/linux/mm.h | 2 +-
> include/linux/mmzone.h | 4 +-
> include/linux/netdevice.h | 8 +-
> include/linux/oprofile.h | 2 +-
> include/linux/padata.h | 2 +-
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> include/linux/perf_event.h | 10 +-
> include/linux/sched.h | 2 +-
> include/linux/slab_def.h | 8 +-
> include/linux/sonet.h | 2 +-
> include/linux/sunrpc/svc_rdma.h | 18 +-
> include/linux/swapops.h | 10 +-
> include/linux/types.h | 17 ++
> include/linux/uio_driver.h | 2 +-
> include/linux/usb.h | 2 +-
> include/linux/vmstat.h | 38 +--
> include/media/v4l2-device.h | 2 +-
> include/net/bonding.h | 2 +-
> include/net/caif/cfctrl.h | 4 +-
> include/net/flow.h | 2 +-
> include/net/gro_cells.h | 2 +-
> include/net/inetpeer.h | 3 +-
> include/net/ip_fib.h | 2 +-
> include/net/ip_vs.h | 4 +-
> include/net/iucv/af_iucv.h | 2 +-
> include/net/net_namespace.h | 12 +-
> include/net/netns/ipv4.h | 4 +-
> include/net/netns/ipv6.h | 4 +-
> include/net/netns/xfrm.h | 2 +-
> include/net/sock.h | 8 +-
> include/net/tcp.h | 2 +-
> include/net/xfrm.h | 2 +-
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> kernel/trace/ring_buffer.c | 98 +++----
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> net/batman-adv/bat_iv_ogm.c | 8 +-
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> net/ceph/messenger.c | 4 +-
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> net/ipv4/inet_timewait_sock.c | 3 +-
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> net/ipv4/raw.c | 5 +-
> net/ipv4/route.c | 12 +-
> net/ipv4/tcp_input.c | 2 +-
> net/ipv4/udp.c | 10 +-
> net/ipv6/addrconf.c | 7 +-
> net/ipv6/af_inet6.c | 2 +-
> net/ipv6/datagram.c | 2 +-
> net/ipv6/ip6_fib.c | 4 +-
> net/ipv6/raw.c | 6 +-
> net/ipv6/udp.c | 6 +-
> net/iucv/af_iucv.c | 5 +-
> net/key/af_key.c | 4 +-
> net/l2tp/l2tp_eth.c | 38 +--
> net/netfilter/ipvs/ip_vs_conn.c | 6 +-
> net/netfilter/ipvs/ip_vs_core.c | 8 +-
> net/netfilter/ipvs/ip_vs_ctl.c | 12 +-
> net/netfilter/ipvs/ip_vs_sync.c | 6 +-
> net/netfilter/ipvs/ip_vs_xmit.c | 4 +-
> net/netfilter/nfnetlink_log.c | 4 +-
> net/netfilter/xt_statistic.c | 9 +-
> net/netlink/af_netlink.c | 4 +-
> net/packet/af_packet.c | 4 +-
> net/phonet/pep.c | 6 +-
> net/phonet/socket.c | 2 +-
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> net/rds/ib_cm.c | 2 +-
> net/rds/ib_recv.c | 4 +-
> net/rxrpc/af_rxrpc.c | 2 +-
> net/rxrpc/ar-internal.h | 4 +-
> net/rxrpc/call_object.c | 2 +-
> net/rxrpc/conn_event.c | 4 +-
> net/rxrpc/conn_object.c | 2 +-
> net/rxrpc/local_object.c | 2 +-
> net/rxrpc/output.c | 4 +-
> net/rxrpc/peer_object.c | 2 +-
> net/rxrpc/proc.c | 2 +-
> net/rxrpc/rxkad.c | 4 +-
> net/sched/sch_generic.c | 4 +-
> net/sctp/sctp_diag.c | 2 +-
> net/sunrpc/auth_gss/svcauth_gss.c | 4 +-
> net/sunrpc/sched.c | 4 +-
> net/sunrpc/xprtrdma/svc_rdma.c | 36 +--
> net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 8 +-
> net/sunrpc/xprtrdma/svc_rdma_sendto.c | 2 +-
> net/sunrpc/xprtrdma/svc_rdma_transport.c | 2 +-
> net/xfrm/xfrm_policy.c | 11 +-
> net/xfrm/xfrm_state.c | 4 +-
> security/Kconfig | 19 ++
> security/integrity/ima/ima.h | 4 +-
> security/integrity/ima/ima_api.c | 2 +-
> security/integrity/ima/ima_fs.c | 4 +-
> security/integrity/ima/ima_queue.c | 2 +-
> security/selinux/avc.c | 7 +-
> security/selinux/include/xfrm.h | 2 +-
> 373 files changed, 3964 insertions(+), 2035 deletions(-)
> create mode 100644 Documentation/security/hardened-atomic.txt
>
> --
> 2.7.4
>
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