This patch is to add debugfs support for ptp_qoriq. Current debugfs
supports to control fiper1/fiper2 loopback mode. If the loopback mode
is enabled, the fiper1/fiper2 pulse is looped back into trigger1/
trigger2 input. This is very useful for validating hardware and driver
without external hardware. Below is an example to enable fiper1 loopback.
echo 1 > /sys/kernel/debug/2d10e00.ptp_clock/fiper1-loopback
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch is to add external trigger stamp fifo support
for 1588 timer.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Documented "fsl,extts-fifo" property.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
The external trigger stamp FIFO was introduced as a new feature
for QorIQ 1588 timer IP block. This patch is to support it by
adding a new dts property "fsl,extts-fifo". Any QorIQ 1588 timer
supporting this feature is required to add this property in its
dts node.
In addition, the FIFO should be cleaned up before enabling external
trigger interrupts. Otherwise, there will be interrupts immediately
just after enabling external trigger interrupts.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The tmr_tevent register would update event bits
no matter tmr_temask bits were set or not. So we
should get interrupts by tmr_tevent & tmr_temask,
and clean up interrupts in tmr_tevent before
enabling them.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
nlmsg_put may fail, this fix add a check of its return value.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Vinod Koul says:
====================
net: Add support for Qualcomm ethqos
Some Qualcomm SoCs sport a ethqos controller which use DW ip, so add
the glue driver which uses stmmac driver along with DT bindings for
this device.
This controller supports rgmii mode and doesn't work with existing
phy drivers as they do not remove the phy delay delay in this mode,
so fix the two phy drivers tested with this.
Changes in v3:
- Add description in DT and rename the file and compatible as suggested by
Rob
- Update changelog for QCA8K driver
- Update AT803x phy disable delay for all RGMxx modes
Changes in v2:
- Fix the example in dt-binding
- Remove DT property for disable the delay and disable delay for RGMII mode
in AT803x and QCA8K PHY drivers
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
In RGMII mode we should not have any delay in port MAC, so disable
the delay.
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
For RGMII mode, phy delay should be disabled. Add this case along
with disable delay routines.
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add myself and Niklas as maintainers for this driver
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add glue driver to support Qualcomm ETHQOS using stmmac driver.
This is based on downstream driver written by Siddarth Gupta, Sunil
Kumar Paidimarri, Rahul Ankushrao Kawadgave, Nisha Menon, Jagadeesh
Babu Challagundla, Chaitanya Pratapa, Lakshit Tyagi, Suraj Jaiswal,
Sneh Shah and Ventrapragada Ravi Kanth
Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add support for Qualcomm ethqos found in some SoCs like QCS404.
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch adds support for the SIOCGHWTSTAMP ioctl which enables user
processes to read the current hwtstamp_config settings
non-destructively.
Signed-off-by: Artem Panfilov <panfilov.artyom@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Linus Lüssing says:
====================
bridge: implement Multicast Router Discovery (RFC4286)
This patchset adds initial Multicast Router Discovery support to
the Linux bridge (RFC4286). With MRD it is possible to detect multicast
routers and mark bridge ports and forward multicast packets to such routers
accordingly.
So far, multicast routers are detected via IGMP/MLD queries and PIM
messages in the Linux bridge. As there is only one active, selected
querier at a time RFC4541 ("Considerations for Internet Group Management
Protocol (IGMP) and Multicast Listener Discovery (MLD) Snooping
Switches") section 2.1.1.a) recommends snooping Multicast Router
Advertisements as provided by MRD (RFC4286).
The first two patches are refactoring some existing code which is reused
for parsing the Multicast Router Advertisements later in the fourth
patch. The third patch lets the bridge join the all-snoopers multicast
address to be able to reliably receive the Multicast Router
Advertisements.
What is not implemented yet from RFC4286 yet:
* Sending Multicast Router Solicitations:
-> RFC4286: "[...] may be sent when [...] an interface is
(re-)initialized [or] MRD is enabled"
* Snooping Multicast Router Terminations:
-> currently this only relies on our own timeouts
* Adjusting timeouts with the values provided in the announcements
Changes in v2:
* rebased to current net-next/master (no conflicts/changes)
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
When multiple multicast routers are present in a broadcast domain then
only one of them will be detectable via IGMP/MLD query snooping. The
multicast router with the lowest IP address will become the selected and
active querier while all other multicast routers will then refrain from
sending queries.
To detect such rather silent multicast routers, too, RFC4286
("Multicast Router Discovery") provides a standardized protocol to
detect multicast routers for multicast snooping switches.
This patch implements the necessary MRD Advertisement message parsing
and after successful processing adds such routers to the internal
multicast router list.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
Next to snooping IGMP/MLD queries RFC4541, section 2.1.1.a) recommends
to snoop multicast router advertisements to detect multicast routers.
Multicast router advertisements are sent to an "all-snoopers"
multicast address. To be able to receive them reliably, we need to
join this group.
Otherwise other snooping switches might refrain from forwarding these
advertisements to us.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
With this patch the internal use of the skb_trimmed is reduced to
the ICMPv6/IGMP checksum verification. And for the length checks
the newly introduced helper functions are used instead of calculating
and checking with skb->len directly.
These changes should hopefully make it easier to verify that length
checks are performed properly.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch refactors ip_mc_check_igmp(), ipv6_mc_check_mld() and
their callers (more precisely, the Linux bridge) to not rely on
the skb_trimmed parameter anymore.
An skb with its tail trimmed to the IP packet length was initially
introduced for the following three reasons:
1) To be able to verify the ICMPv6 checksum.
2) To be able to distinguish the version of an IGMP or MLD query.
They are distinguishable only by their size.
3) To avoid parsing data for an IGMPv3 or MLDv2 report that is
beyond the IP packet but still within the skb.
The first case still uses a cloned and potentially trimmed skb to
verfiy. However, there is no need to propagate it to the caller.
For the second and third case explicit IP packet length checks were
added.
This hopefully makes ip_mc_check_igmp() and ipv6_mc_check_mld() easier
to read and verfiy, as well as easier to use.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch adds PCI device IDs to support following cards:
1. Add device id 0x0205 for HINIC 100GE dual port mezz card.
2. Add device id 0x0210 for HINIC 25GE quad port mezz card.
3. Delete device id 0x0201 for HINIC 100GE dual port card, because
this is used by other product.
4. Macro of device id 0x200 is modified for HINIC 100GE dual port card.
Signed-off-by: Xue Chaojing <xuechaojing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The old non-PCIe chip versions support PCI DAC, however this feature
seems to be fragile, see comment in the PCI error handler. Therefore
it's disabled per default. I think meanwhile it's time remove support
for this legacy feature. This helps to reduce complexity of the driver.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years ago, as part of 6f0333b8fd ("r8169: use 50% less ram for RX
ring"), the alignment requirement for rx buffers was silently changed
from 8 bytes to 16 bytes. I found nothing explaining this, also the
chip specs I have only mention an 8 byte requirement.
AFAICS kmalloc_node() guarantees allocated memory to be at least
"long long" aligned, what is 8 bytes on a 32 bit machine.
So we can take this memory as-is and avoid some overhead by changing
the alignment requirement back to 8 bytes.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Currently the soft reset (if defined) is done only if the driver also
implements the config_init callback. I think this dependency is a
mistake, so let's remove it.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
It was reported that on a system with nfsboot and w/o initramfs network
fails because trying to load the PHY driver returns -ENOENT. Reason was
that due to missing initramfs the modprobe binary isn't available.
So we have to ignore error code -ENOENT.
Fixes: 13d0ab6750 ("net: phy: check return code when requesting PHY driver module")
Reported-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jeff Kirsher says:
====================
40GbE Intel Wired LAN Driver Updates 2019-01-22
This series contains updates to i40e and xsk.
Jan exports xdp_get_umem_from_qid() for other drivers/modules to use.
Refactored the code use the netdev provided umems, instead of containing
them inside our i40e_vsi.
Aleksandr fixes an issue where RSS queues were misconfigured, so limit
the RSS queue number to the online CPU number.
Damian adds support for ethtool's setting and getting the FEC
configuration.
Grzegorz fixes a type mismatch, where the return value was not matching
the function declaration.
Sergey adds checks in the queue configuration handler to ensure the
number of queue pairs requested by the VF is less than maximum possible.
Lihong cleans up code left around from earlier silicon validation in the
i40e debugfs code.
Julia Lawall and Colin Ian King clean up white space indentation issues
found.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Nikolay Aleksandrov says:
====================
bonding: add 3ad stats and export them via xstats
This set adds support for counting some 3ad-specific packet types and
exports the new stats via the xstats API. atomic64 counters are used
since these are not fastpaths and we can avoid the per-cpu allocations.
Each 3ad counter is exported as a separate attribute to be easily
extensible since we plan to add more later. The stats are per-slave and
when the master stats are requested the slaves' stats are summed up.
Patches 01 and 02 do minor cleanups in preparation for the new stats
API. Patch 03 adds the new stats and patch 04 adds xstats support to
export them.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch adds support for extended statistics (xstats) call to the
bonding. The first user would be the 3ad code which counts the following
events:
- LACPDU Rx/Tx
- LACPDU unknown type Rx
- LACPDU illegal Rx
- Marker Rx/Tx
- Marker response Rx/Tx
- Marker unknown type Rx
All of these are exported via netlink as separate attributes to be
easily extensible as we plan to add more in the future.
Similar to how the bridge and other xstats exports, the structure
inside is:
[ IFLA_STATS_LINK_XSTATS ]
-> [ LINK_XSTATS_TYPE_BOND ]
-> [ BOND_XSTATS_3AD ]
-> [ 3ad stats attributes ]
With this structure it's easy to add more stat types later.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Count the following types of 3ad packets per slave:
- rx/tx lacpdu
- rx/tx marker
- rx/tx marker response
- rx illegal lacpdus (right now counted on wrong length)
- rx unknown lacpdu type
- rx unknown marker type
The counters are using atomic64 since this is not fast path.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Since the received lacpdu is accessed via skb_header_pointer() in
bond_3ad_lacpdu_recv() we no longer need to check for skb->len's length.
If the returned lacpdu pointer is not null that should be enough.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
No functional changes, adjust the style of bond_3ad_rx_indication to
prepare it for the stats changes:
- reduce indentation by returning early on wrong length
- remove extra new lines between switch cases
- add marker local variable and use it to reduce line length
- rearrange local variables in reverse xmas tree
- separate final return
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
build protos is required for tls_hw_prot also hence moved to
'tls_build_proto' and called as required from tls_init
and tls_hw_proto. This is required since build_protos
for v4 is moved from tls_register to tls_init in
commit <28cb6f1eaffdc5a6a9707cac55f4a43aa3fd7895>
Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
There have been many people complaining about the inconsistent
behaviors of IPv4 and IPv6 devconf when creating new network
namespaces. Currently, for IPv4, we inherit all current settings
from init_net, but for IPv6 we reset all setting to default.
This patch introduces a new /proc file
/proc/sys/net/core/devconf_inherit_init_net to control the
behavior of whether to inhert sysctl current settings from init_net.
This file itself is only available in init_net.
As demonstrated below:
Initial setup in init_net:
# cat /proc/sys/net/ipv4/conf/all/rp_filter
2
# cat /proc/sys/net/ipv6/conf/all/accept_dad
1
Default value 0 (current behavior):
# ip netns del test
# ip netns add test
# ip netns exec test cat /proc/sys/net/ipv4/conf/all/rp_filter
2
# ip netns exec test cat /proc/sys/net/ipv6/conf/all/accept_dad
0
Set to 1 (inherit from init_net):
# echo 1 > /proc/sys/net/core/devconf_inherit_init_net
# ip netns del test
# ip netns add test
# ip netns exec test cat /proc/sys/net/ipv4/conf/all/rp_filter
2
# ip netns exec test cat /proc/sys/net/ipv6/conf/all/accept_dad
1
Set to 2 (reset to default):
# echo 2 > /proc/sys/net/core/devconf_inherit_init_net
# ip netns del test
# ip netns add test
# ip netns exec test cat /proc/sys/net/ipv4/conf/all/rp_filter
0
# ip netns exec test cat /proc/sys/net/ipv6/conf/all/accept_dad
0
Set to a value out of range (invalid):
# echo 3 > /proc/sys/net/core/devconf_inherit_init_net
-bash: echo: write error: Invalid argument
# echo -1 > /proc/sys/net/core/devconf_inherit_init_net
-bash: echo: write error: Invalid argument
Reported-by: Zhu Yanjun <Yanjun.Zhu@windriver.com>
Reported-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
There are several statements that have incorrect levels of indentation,
fix these.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Convert spaces to tabs to get correct alignment.
Found with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Alice Michael <alice.michael@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
The tx_timeout command from debugfs was originally intended to support
early silicon validation efforts. It is no longer needed. Thus remove it to
avoid misuse of triggering tx_timeout through debugfs.
Signed-off-by: Lihong Yang <lihong.yang@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Check if num_queue_pairs number requested by VF is less than
maximum possible value in VIRTCHNL_OP_CONFIG_VSI_QUEUES handler.
Also check if local_vf_id >= 0 in common handler since it is of
int type and can potentially be negative.
Signed-off-by: Sergey Nemov <sergey.nemov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Change of function declaration from int to u64 due to
return type mismatch (u64).
Signed-off-by: Grzegorz Siwik <grzegorz.siwik@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This patch adds support for setting/getting FEC configuration
using ethtool options:
set/show-priv-flags rs-fec/base-r-fec
set/show-fec off/rs/baser/auto for kernels version >= 4.14
Signed-off-by: Damian Dybek <damian.dybek@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Limiting RSS queues number to online CPUs number in order to
avoid issues with creating misconfigured RSS queues.
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
As current implementation of netdev already contains and provides
umems for us, we no longer have the need to contain these
structures in i40e_vsi.
Refactor the code to operate on netdev-provided umems.
Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Export xdp_get_umem_from_qid for other modules to use.
Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
- Fix console ramoops to show the previous boot logs (Sai Prakash Ranjan)
- Avoid allocation and leak of platform data
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Merge tag 'pstore-v5.0-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull pstore fixes from Kees Cook:
- Fix console ramoops to show the previous boot logs (Sai Prakash
Ranjan)
- Avoid allocation and leak of platform data
* tag 'pstore-v5.0-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
pstore/ram: Avoid allocation and leak of platform data
pstore/ram: Fix console ramoops to show the previous boot logs
Pull networking fixes from David Miller:
1) Fix endless loop in nf_tables, from Phil Sutter.
2) Fix cross namespace ip6_gre tunnel hash list corruption, from
Olivier Matz.
3) Don't be too strict in phy_start_aneg() otherwise we might not allow
restarting auto negotiation. From Heiner Kallweit.
4) Fix various KMSAN uninitialized value cases in tipc, from Ying Xue.
5) Memory leak in act_tunnel_key, from Davide Caratti.
6) Handle chip errata of mv88e6390 PHY, from Andrew Lunn.
7) Remove linear SKB assumption in fou/fou6, from Eric Dumazet.
8) Missing udplite rehash callbacks, from Alexey Kodanev.
9) Log dirty pages properly in vhost, from Jason Wang.
10) Use consume_skb() in neigh_probe() as this is a normal free not a
drop, from Yang Wei. Likewise in macvlan_process_broadcast().
11) Missing device_del() in mdiobus_register() error paths, from Thomas
Petazzoni.
12) Fix checksum handling of short packets in mlx5, from Cong Wang.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (96 commits)
bpf: in __bpf_redirect_no_mac pull mac only if present
virtio_net: bulk free tx skbs
net: phy: phy driver features are mandatory
isdn: avm: Fix string plus integer warning from Clang
net/mlx5e: Fix cb_ident duplicate in indirect block register
net/mlx5e: Fix wrong (zero) TX drop counter indication for representor
net/mlx5e: Fix wrong error code return on FEC query failure
net/mlx5e: Force CHECKSUM_UNNECESSARY for short ethernet frames
tools: bpftool: Cleanup license mess
bpf: fix inner map masking to prevent oob under speculation
bpf: pull in pkt_sched.h header for tooling to fix bpftool build
selftests: forwarding: Add a test case for externally learned FDB entries
selftests: mlxsw: Test FDB offload indication
mlxsw: spectrum_switchdev: Do not treat static FDB entries as sticky
net: bridge: Mark FDB entries that were added by user as such
mlxsw: spectrum_fid: Update dummy FID index
mlxsw: pci: Return error on PCI reset timeout
mlxsw: pci: Increase PCI SW reset timeout
mlxsw: pci: Ring CQ's doorbell before RDQ's
MAINTAINERS: update email addresses of liquidio driver maintainers
...
Yue Hu noticed that when parsing device tree the allocated platform data
was never freed. Since it's not used beyond the function scope, this
switches to using a stack variable instead.
Reported-by: Yue Hu <huyue2@yulong.com>
Fixes: 35da60941e ("pstore/ram: add Device Tree bindings")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
GCC 9 reworks the way the references to the stack canary are
emitted, to prevent the value from being spilled to the stack
before the final comparison in the epilogue, defeating the
purpose, given that the spill slot is under control of the
attacker that we are protecting ourselves from.
Since our canary value address is obtained without accessing
memory (as opposed to pre-v7 code that will obtain it from a
literal pool), it is unlikely (although not guaranteed) that
the compiler will spill the canary value in the same way, so
let's just disable this improvement when building with GCC9+.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
