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  1. 15 May, 2014 1 commit
  3. 14 May, 2014 6 commits
    • Heiko Carstens's avatar
      net: filter: s390: fix JIT address randomization · e84d2f8d
      Heiko Carstens authored 
      This is the s390 variant of Alexei's JIT bug fix.
(patch description below stolen from Alexei's patch)

bpf_alloc_binary() adds 128 bytes of room to JITed program image
and rounds it up to the nearest page size. If image size is close
to page size (like 4000), it is rounded to two pages:
round_up(4000 + 4 + 128) == 8192
then 'hole' is computed as 8192 - (4000 + 4) = 4188
If prandom_u32() % hole selects a number >= PAGE_SIZE - sizeof(*header)
then kernel will crash during bpf_jit_free():

kernel BUG at arch/x86/mm/pageattr.c:887!
Call Trace:
 [<ffffffff81037285>] change_page_attr_set_clr+0x135/0x460
 [<ffffffff81694cc0>] ? _raw_spin_unlock_irq+0x30/0x50
 [<ffffffff810378ff>] set_memory_rw+0x2f/0x40
 [<ffffffffa01a0d8d>] bpf_jit_free_deferred+0x2d/0x60
 [<ffffffff8106bf98>] process_one_work+0x1d8/0x6a0
 [<ffffffff8106bf38>] ? process_one_work+0x178/0x6a0
 [<ffffffff8106c90c>] worker_thread+0x11c/0x370

since bpf_jit_free() does:
  unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK;
  struct bpf_binary_header *header = (void *)addr;
to compute start address of 'bpf_binary_header'
and header->pages will pass junk to:
  set_memory_rw(addr, header->pages);

Fix it by making sure that &header->image[prandom_u32() % hole] and &header
are in the same page.

Fixes: aa2d2c73 ("s390/bpf,jit: address randomize and write protect jit code")
Reported-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
Cc: <stable@vger.kernel.org> # v3.11+
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e84d2f8d
    • Ursula Braun's avatar
      af_iucv: wrong mapping of sent and confirmed skbs · f5738e2e
      Ursula Braun authored 
      When sending data through IUCV a MESSAGE COMPLETE interrupt
signals that sent data memory can be freed or reused again.
With commit f9c41a62
"af_iucv: fix recvmsg by replacing skb_pull() function" the
MESSAGE COMPLETE callback iucv_callback_txdone() identifies
the wrong skb as being confirmed, which leads to data corruption.
This patch fixes the skb mapping logic in iucv_callback_txdone().
Signed-off-by: default avatarUrsula Braun <ursula.braun@de.ibm.com>
Signed-off-by: default avatarFrank Blaschka <frank.blaschka@de.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f5738e2e
    • Kalesh AP's avatar
      be2net: enable interrupts in EEH resume · 03a58baa
      Kalesh AP authored 
      On some BE3 FW versions, after a HW reset, interrupts will remain disabled
for each function. So, explicitly enable the interrupts in the eeh_resume
handler, else after an eeh recovery interrupts wouldn't work.
Signed-off-by: default avatarKalesh AP <kalesh.purayil@emulex.com>
Signed-off-by: default avatarSathya Perla <sathya.perla@emulex.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      03a58baa
    • Neil Horman's avatar
      jme: Fix unmap loop counting error: · c4b16068
      Neil Horman authored 
      In my recent fix (76a691d0: fix dma unmap warning), Ben Hutchings noted that my
loop count was incorrect.  Where j started at startidx, it should have started
at zero, and gone on for count entries, not to endidx.  Additionally, a DMA
resource exhaustion should drop the frame and (for now), return
NETDEV_TX_OK, not NETEV_TX_BUSY.  This patch fixes both of those issues:
Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
CC: Ben Hutchings <ben@decadent.org.uk>
CC: "David S. Miller" <davem@davemloft.net>
CC: Guo-Fu Tseng <cooldavid@cooldavid.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c4b16068
    • Hannes Frederic Sowa's avatar
      ipv6: fix calculation of option len in ip6_append_data · 3a1cebe7
      Hannes Frederic Sowa authored 
      tot_len does specify the size of struct ipv6_txoptions. We need opt_flen +
opt_nflen to calculate the overall length of additional ipv6 extensions.

I found this while auditing the ipv6 output path for a memory corruption
reported by Alexey Preobrazhensky while he fuzzed an instrumented
AddressSanitizer kernel with trinity. This may or may not be the cause
of the original bug.

Fixes: 4df98e76 ("ipv6: pmtudisc setting not respected with UFO/CORK")
Reported-by: default avatarAlexey Preobrazhensky <preobr@google.com>
Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3a1cebe7
    • Hannes Frederic Sowa's avatar
      net: avoid dependency of net_get_random_once on nop patching · 3d440522
      Hannes Frederic Sowa authored 
      net_get_random_once depends on the static keys infrastructure to patch up
the branch to the slow path during boot. This was realized by abusing the
static keys api and defining a new initializer to not enable the call
site while still indicating that the branch point should get patched
up. This was needed to have the fast path considered likely by gcc.

The static key initialization during boot up normally walks through all
the registered keys and either patches in ideal nops or enables the jump
site but omitted that step on x86 if ideal nops where already placed at
static_key branch points. Thus net_get_random_once branches not always
became active.

This patch switches net_get_random_once to the ordinary static_key
api and thus places the kernel fast path in the - by gcc considered -
unlikely path.  Microbenchmarks on Intel and AMD x86-64 showed that
the unlikely path actually beats the likely path in terms of cycle cost
and that different nop patterns did not make much difference, thus this
switch should not be noticeable.

Fixes: a48e4292 ("net: introduce new macro net_get_random_once")
Reported-by: default avatarTuomas Räsänen <tuomasjjrasanen@tjjr.fi>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3d440522
  5. 13 May, 2014 4 commits
    • Alexei Starovoitov's avatar
      net: filter: x86: fix JIT address randomization · 773cd38f
      Alexei Starovoitov authored 
      bpf_alloc_binary() adds 128 bytes of room to JITed program image
and rounds it up to the nearest page size. If image size is close
to page size (like 4000), it is rounded to two pages:
round_up(4000 + 4 + 128) == 8192
then 'hole' is computed as 8192 - (4000 + 4) = 4188
If prandom_u32() % hole selects a number >= PAGE_SIZE - sizeof(*header)
then kernel will crash during bpf_jit_free():

kernel BUG at arch/x86/mm/pageattr.c:887!
Call Trace:
 [<ffffffff81037285>] change_page_attr_set_clr+0x135/0x460
 [<ffffffff81694cc0>] ? _raw_spin_unlock_irq+0x30/0x50
 [<ffffffff810378ff>] set_memory_rw+0x2f/0x40
 [<ffffffffa01a0d8d>] bpf_jit_free_deferred+0x2d/0x60
 [<ffffffff8106bf98>] process_one_work+0x1d8/0x6a0
 [<ffffffff8106bf38>] ? process_one_work+0x178/0x6a0
 [<ffffffff8106c90c>] worker_thread+0x11c/0x370

since bpf_jit_free() does:
  unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK;
  struct bpf_binary_header *header = (void *)addr;
to compute start address of 'bpf_binary_header'
and header->pages will pass junk to:
  set_memory_rw(addr, header->pages);

Fix it by making sure that &header->image[prandom_u32() % hole] and &header
are in the same page

Fixes: 314beb9b ("x86: bpf_jit_comp: secure bpf jit against spraying attacks")
Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      773cd38f
    • David S. Miller's avatar
      Merge tag 'batman-adv-fix-for-davem' of git://git.open-mesh.org/linux-merge · 6262971a
      David S. Miller authored 
      Included changes:
- properly release neigh_ifinfo in batadv_iv_ogm_process_per_outif()
- properly release orig_ifinfo->router when freeing orig_ifinfo
- properly release neigh_node objects during periodic check
- properly release neigh_info objects when the related hard_iface
  is free'd

These changes are all very important because they fix some
reference counting imbalances that lead to the
impossibility of releasing the netdev object used by
batman-adv on shutdown.
The consequence is that such object cannot be destroyed by
the networking stack (the refcounter does not reach zero)
thus bringing the system in hanging state during a normal
reboot operation or a network reconfiguration.
      6262971a
    • Duan Jiong's avatar
      neigh: set nud_state to NUD_INCOMPLETE when probing router reachability · 2176d5d4
      Duan Jiong authored 
      Since commit 7e980569("ipv6: router reachability probing"), a router falls
into NUD_FAILED will be probed.

Now if function rt6_select() selects a router which neighbour state is NUD_FAILED,
and at the same time function rt6_probe() changes the neighbour state to NUD_PROBE,
then function dst_neigh_output() can directly send packets, but actually the
neighbour still is unreachable. If we set nud_state to NUD_INCOMPLETE instead
NUD_PROBE, packets will not be sent out until the neihbour is reachable.

In addition, because the route should be probes with a single NS, so we must
set neigh->probes to neigh_max_probes(), then the neigh timer timeout and function
neigh_timer_handler() will not send other NS Messages.
Signed-off-by: default avatarDuan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2176d5d4
    • Susant Sahani's avatar
      ip6_tunnel: fix potential NULL pointer dereference · c8965932
      Susant Sahani authored 
      The function ip6_tnl_validate assumes that the rtnl
attribute IFLA_IPTUN_PROTO always be filled . If this
attribute is not filled by  the userspace application
kernel get crashed with NULL pointer dereference. This
patch fixes the potential kernel crash when
IFLA_IPTUN_PROTO is missing .
Signed-off-by: default avatarSusant Sahani <susant@redhat.com>
Acked-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c8965932
  7. 12 May, 2014 3 commits
  9. 11 May, 2014 1 commit
  11. 10 May, 2014 3 commits
  13. 09 May, 2014 15 commits
  15. 08 May, 2014 1 commit
  17. 07 May, 2014 6 commits
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