| Age | Commit message (Collapse) | Author |
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In nsim_fib_init(), if register_fib_notifier failed, nsim_fib_net_ops
should be unregistered before return.
In nsim_fib_exit(), unregister_fib_notifier should be called before
nsim_fib_net_ops be unregistered, otherwise may cause use-after-free:
BUG: KASAN: use-after-free in nsim_fib_event_nb+0x342/0x570 [netdevsim]
Read of size 8 at addr ffff8881daaf4388 by task kworker/0:3/3499
CPU: 0 PID: 3499 Comm: kworker/0:3 Not tainted 5.3.0-rc7+ #30
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
Workqueue: ipv6_addrconf addrconf_dad_work [ipv6]
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xa9/0x10e lib/dump_stack.c:113
print_address_description+0x65/0x380 mm/kasan/report.c:351
__kasan_report+0x149/0x18d mm/kasan/report.c:482
kasan_report+0xe/0x20 mm/kasan/common.c:618
nsim_fib_event_nb+0x342/0x570 [netdevsim]
notifier_call_chain+0x52/0xf0 kernel/notifier.c:95
__atomic_notifier_call_chain+0x78/0x140 kernel/notifier.c:185
call_fib_notifiers+0x30/0x60 net/core/fib_notifier.c:30
call_fib6_entry_notifiers+0xc1/0x100 [ipv6]
fib6_add+0x92e/0x1b10 [ipv6]
__ip6_ins_rt+0x40/0x60 [ipv6]
ip6_ins_rt+0x84/0xb0 [ipv6]
__ipv6_ifa_notify+0x4b6/0x550 [ipv6]
ipv6_ifa_notify+0xa5/0x180 [ipv6]
addrconf_dad_completed+0xca/0x640 [ipv6]
addrconf_dad_work+0x296/0x960 [ipv6]
process_one_work+0x5c0/0xc00 kernel/workqueue.c:2269
worker_thread+0x5c/0x670 kernel/workqueue.c:2415
kthread+0x1d7/0x200 kernel/kthread.c:255
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Allocated by task 3388:
save_stack+0x19/0x80 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_kmalloc.constprop.3+0xa0/0xd0 mm/kasan/common.c:493
kmalloc include/linux/slab.h:557 [inline]
kzalloc include/linux/slab.h:748 [inline]
ops_init+0xa9/0x220 net/core/net_namespace.c:127
__register_pernet_operations net/core/net_namespace.c:1135 [inline]
register_pernet_operations+0x1d4/0x420 net/core/net_namespace.c:1212
register_pernet_subsys+0x24/0x40 net/core/net_namespace.c:1253
nsim_fib_init+0x12/0x70 [netdevsim]
veth_get_link_ksettings+0x2b/0x50 [veth]
do_one_initcall+0xd4/0x454 init/main.c:939
do_init_module+0xe0/0x330 kernel/module.c:3490
load_module+0x3c2f/0x4620 kernel/module.c:3841
__do_sys_finit_module+0x163/0x190 kernel/module.c:3931
do_syscall_64+0x72/0x2e0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 3534:
save_stack+0x19/0x80 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x130/0x180 mm/kasan/common.c:455
slab_free_hook mm/slub.c:1423 [inline]
slab_free_freelist_hook mm/slub.c:1474 [inline]
slab_free mm/slub.c:3016 [inline]
kfree+0xe9/0x2d0 mm/slub.c:3957
ops_free net/core/net_namespace.c:151 [inline]
ops_free_list.part.7+0x156/0x220 net/core/net_namespace.c:184
ops_free_list net/core/net_namespace.c:182 [inline]
__unregister_pernet_operations net/core/net_namespace.c:1165 [inline]
unregister_pernet_operations+0x221/0x2a0 net/core/net_namespace.c:1224
unregister_pernet_subsys+0x1d/0x30 net/core/net_namespace.c:1271
nsim_fib_exit+0x11/0x20 [netdevsim]
nsim_module_exit+0x16/0x21 [netdevsim]
__do_sys_delete_module kernel/module.c:1015 [inline]
__se_sys_delete_module kernel/module.c:958 [inline]
__x64_sys_delete_module+0x244/0x330 kernel/module.c:958
do_syscall_64+0x72/0x2e0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 59c84b9fcf42 ("netdevsim: Restore per-network namespace accounting for fib entries")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Prior to the commit in the fixes tag, the resource controller in netdevsim
tracked fib entries and rules per network namespace. Restore that behavior.
Fixes: 5fc494225c1e ("netdevsim: create devlink instance per netdevsim instance")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Currently there is one devlink instance created per network namespace.
That is quite odd considering the fact that devlink instance should
represent an ASIC. The following patches are going to move the devlink
instance even more down to a bus device, but until then, have one
devlink instance per netdevsim instance. Struct nsim_devlink is
introduced to hold fib setting.
The changes in the fib code are only related to holding the
configuration per devlink instance instead of network namespace.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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devlink reset command can fail if a FIB resource limit is set to a value
lower than the current occupancy. Return a proper message indicating the
reason for the failure.
$ devlink resource sh netdevsim/netdevsim0
netdevsim/netdevsim0:
name IPv4 size unlimited unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
resources:
name fib size unlimited occ 43 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
name fib-rules size unlimited occ 4 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
name IPv6 size unlimited unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
resources:
name fib size unlimited occ 54 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
name fib-rules size unlimited occ 3 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
$ devlink resource set netdevsim/netdevsim0 path /IPv4/fib size 40
$ devlink dev reload netdevsim/netdevsim0
Error: netdevsim: New size is less than current occupancy.
devlink answers: Invalid argument
Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The __net_initdata section cannot currently be used for structures that
get cleaned up in an exitcall using unregister_pernet_operations:
WARNING: vmlinux.o(.text+0x868c34): Section mismatch in reference from the function nsim_devlink_exit() to the (unknown reference) .init.data:(unknown)
The function nsim_devlink_exit() references
the (unknown reference) __initdata (unknown).
This is often because nsim_devlink_exit lacks a __initdata
annotation or the annotation of (unknown) is wrong.
WARNING: vmlinux.o(.text+0x868c64): Section mismatch in reference from the function nsim_devlink_init() to the (unknown reference) .init.data:(unknown)
WARNING: vmlinux.o(.text+0x8692bc): Section mismatch in reference from the function nsim_fib_exit() to the (unknown reference) .init.data:(unknown)
WARNING: vmlinux.o(.text+0x869300): Section mismatch in reference from the function nsim_fib_init() to the (unknown reference) .init.data:(unknown)
As that warning tells us, discarding the structure after a module is
loaded would lead to a undefined behavior when that module is removed.
It might be possible to change that annotation so it has no effect for
loadable modules, but I have not figured out exactly how to do that, and
we want this to be fixed in -rc1.
This just removes the annotations, just like we do for all other such
modules.
Fixes: 37923ed6b8ce ("netdevsim: Add simple FIB resource controller via devlink")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add devlink support to netdevsim and use it to implement a simple,
profile based resource controller. Only one controller is needed
per namespace, so the first netdevsim netdevice in a namespace
registers with devlink. If that device is deleted, the resource
settings are deleted.
The resource controller allows a user to limit the number of IPv4 and
IPv6 FIB entries and FIB rules. The resource paths are:
/IPv4
/IPv4/fib
/IPv4/fib-rules
/IPv6
/IPv6/fib
/IPv6/fib-rules
The IPv4 and IPv6 top level resources are unlimited in size and can not
be changed. From there, the number of FIB entries and FIB rule entries
are unlimited by default. A user can specify a limit for the fib and
fib-rules resources:
$ devlink resource set netdevsim/netdevsim0 path /IPv4/fib size 96
$ devlink resource set netdevsim/netdevsim0 path /IPv4/fib-rules size 16
$ devlink resource set netdevsim/netdevsim0 path /IPv6/fib size 64
$ devlink resource set netdevsim/netdevsim0 path /IPv6/fib-rules size 16
$ devlink dev reload netdevsim/netdevsim0
such that the number of rules or routes is limited (96 ipv4 routes in the
example above):
$ for n in $(seq 1 32); do ip ro add 10.99.$n.0/24 dev eth1; done
Error: netdevsim: Exceeded number of supported fib entries.
$ devlink resource show netdevsim/netdevsim0
netdevsim/netdevsim0:
name IPv4 size unlimited unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables non
resources:
name fib size 96 occ 96 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables
...
With this template in place for resource management, it is fairly trivial
to extend and shows one way to implement a simple counter based resource
controller typical of network profiles.
Currently, devlink only supports initial namespace. Code is in place to
adapt netdevsim to a per namespace controller once the network namespace
issues are resolved.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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