Commits · 6c32c9d5907e4e567bb989eb19000e18d40adc17 · Mirrors / git.kernel.org / pub_scm_linux_kernel_git_stable_linux

Apr 03, 2020

hsr: use rcu_read_lock() in hsr_get_node_{list/status}() · 6c32c9d5

Taehee Yoo authored Mar 13, 2020

[ Upstream commit 173756b8 ]

hsr_get_node_{list/status}() are not under rtnl_lock() because
they are callback functions of generic netlink.
But they use __dev_get_by_index() without rtnl_lock().
So, it would use unsafe data.
In order to fix it, rcu_read_lock() and dev_get_by_index_rcu()
are used instead of __dev_get_by_index().

Fixes: f421436a

 ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

6c32c9d5

vxlan: check return value of gro_cells_init() · 2451793d

Taehee Yoo authored Mar 18, 2020

[ Upstream commit 384d91c2 ]

gro_cells_init() returns error if memory allocation is failed.
But the vxlan module doesn't check the return value of gro_cells_init().

Fixes: 58ce31cc

 ("vxlan: GRO support at tunnel layer")`
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2451793d

slcan: not call free_netdev before rtnl_unlock in slcan_open · f59604a8

Oliver Hartkopp authored Mar 21, 2020

[ Upstream commit 2091a3d4 ]

As the description before netdev_run_todo, we cannot call free_netdev
before rtnl_unlock, fix it by reorder the code.

This patch is a 1:1 copy of upstream slip.c commit f596c870


("slip: not call free_netdev before rtnl_unlock in slip_open").

Reported-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

f59604a8

NFC: fdp: Fix a signedness bug in fdp_nci_send_patch() · 14de358f

Dan Carpenter authored Mar 20, 2020

[ Upstream commit 0dcdf9f6 ]

The nci_conn_max_data_pkt_payload_size() function sometimes returns
-EPROTO so "max_size" needs to be signed for the error handling to
work.  We can make "payload_size" an int as well.

Fixes: a06347c0

 ("NFC: Add Intel Fields Peak NFC solution driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

14de358f

net_sched: keep alloc_hash updated after hash allocation · d6cdc5bb

Cong Wang authored Mar 11, 2020

[ Upstream commit 0d1c3530 ]

In commit 599be01e

 ("net_sched: fix an OOB access in cls_tcindex")
I moved cp->hash calculation before the first
tcindex_alloc_perfect_hash(), but cp->alloc_hash is left untouched.
This difference could lead to another out of bound access.

cp->alloc_hash should always be the size allocated, we should
update it after this tcindex_alloc_perfect_hash().

Reported-and-tested-by:  <syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com>
Reported-and-tested-by:  <syzbot+c72da7b9ed57cde6fca2@syzkaller.appspotmail.com>
Fixes: 599be01e

 ("net_sched: fix an OOB access in cls_tcindex")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

d6cdc5bb

net_sched: cls_route: remove the right filter from hashtable · 7518af64

Cong Wang authored Mar 13, 2020

[ Upstream commit ef299cc3

 ]

route4_change() allocates a new filter and copies values from
the old one. After the new filter is inserted into the hash
table, the old filter should be removed and freed, as the final
step of the update.

However, the current code mistakenly removes the new one. This
looks apparently wrong to me, and it causes double "free" and
use-after-free too, as reported by syzbot.

Reported-and-tested-by:  <syzbot+f9b32aaacd60305d9687@syzkaller.appspotmail.com>
Reported-and-tested-by:  <syzbot+2f8c233f131943d6056d@syzkaller.appspotmail.com>
Reported-and-tested-by:  <syzbot+9c2df9fd5e9445b74e01@syzkaller.appspotmail.com>
Fixes: 1109c005

 ("net: sched: RCU cls_route")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

7518af64

net: dsa: Fix duplicate frames flooded by learning · dfddfa8c

Florian Fainelli authored Mar 22, 2020

[ Upstream commit 0e62f543 ]

When both the switch and the bridge are learning about new addresses,
switch ports attached to the bridge would see duplicate ARP frames
because both entities would attempt to send them.

Fixes: 5037d532

 ("net: dsa: add Broadcom tag RX/TX handler")
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

dfddfa8c

hsr: fix general protection fault in hsr_addr_is_self() · 81494b38

Taehee Yoo authored Mar 21, 2020

[ Upstream commit 3a303cfd

 ]

The port->hsr is used in the hsr_handle_frame(), which is a
callback of rx_handler.
hsr master and slaves are initialized in hsr_add_port().
This function initializes several pointers, which includes port->hsr after
registering rx_handler.
So, in the rx_handler routine, un-initialized pointer would be used.
In order to fix this, pointers should be initialized before
registering rx_handler.

Test commands:
    ip netns del left
    ip netns del right
    modprobe -rv veth
    modprobe -rv hsr
    killall ping
    modprobe hsr
    ip netns add left
    ip netns add right
    ip link add veth0 type veth peer name veth1
    ip link add veth2 type veth peer name veth3
    ip link add veth4 type veth peer name veth5
    ip link set veth1 netns left
    ip link set veth3 netns right
    ip link set veth4 netns left
    ip link set veth5 netns right
    ip link set veth0 up
    ip link set veth2 up
    ip link set veth0 address fc:00:00:00:00:01
    ip link set veth2 address fc:00:00:00:00:02
    ip netns exec left ip link set veth1 up
    ip netns exec left ip link set veth4 up
    ip netns exec right ip link set veth3 up
    ip netns exec right ip link set veth5 up
    ip link add hsr0 type hsr slave1 veth0 slave2 veth2
    ip a a 192.168.100.1/24 dev hsr0
    ip link set hsr0 up
    ip netns exec left ip link add hsr1 type hsr slave1 veth1 slave2 veth4
    ip netns exec left ip a a 192.168.100.2/24 dev hsr1
    ip netns exec left ip link set hsr1 up
    ip netns exec left ip n a 192.168.100.1 dev hsr1 lladdr \
	    fc:00:00:00:00:01 nud permanent
    ip netns exec left ip n r 192.168.100.1 dev hsr1 lladdr \
	    fc:00:00:00:00:01 nud permanent
    for i in {1..100}
    do
        ip netns exec left ping 192.168.100.1 &
    done
    ip netns exec left hping3 192.168.100.1 -2 --flood &
    ip netns exec right ip link add hsr2 type hsr slave1 veth3 slave2 veth5
    ip netns exec right ip a a 192.168.100.3/24 dev hsr2
    ip netns exec right ip link set hsr2 up
    ip netns exec right ip n a 192.168.100.1 dev hsr2 lladdr \
	    fc:00:00:00:00:02 nud permanent
    ip netns exec right ip n r 192.168.100.1 dev hsr2 lladdr \
	    fc:00:00:00:00:02 nud permanent
    for i in {1..100}
    do
        ip netns exec right ping 192.168.100.1 &
    done
    ip netns exec right hping3 192.168.100.1 -2 --flood &
    while :
    do
        ip link add hsr0 type hsr slave1 veth0 slave2 veth2
	ip a a 192.168.100.1/24 dev hsr0
	ip link set hsr0 up
	ip link del hsr0
    done

Splat looks like:
[  120.954938][    C0] general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1]I
[  120.957761][    C0] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[  120.959064][    C0] CPU: 0 PID: 1511 Comm: hping3 Not tainted 5.6.0-rc5+ #460
[  120.960054][    C0] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[  120.962261][    C0] RIP: 0010:hsr_addr_is_self+0x65/0x2a0 [hsr]
[  120.963149][    C0] Code: 44 24 18 70 73 2f c0 48 c1 eb 03 48 8d 04 13 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 4
[  120.966277][    C0] RSP: 0018:ffff8880d9c09af0 EFLAGS: 00010206
[  120.967293][    C0] RAX: 0000000000000006 RBX: 1ffff1101b38135f RCX: 0000000000000000
[  120.968516][    C0] RDX: dffffc0000000000 RSI: ffff8880d17cb208 RDI: 0000000000000000
[  120.969718][    C0] RBP: 0000000000000030 R08: ffffed101b3c0e3c R09: 0000000000000001
[  120.972203][    C0] R10: 0000000000000001 R11: ffffed101b3c0e3b R12: 0000000000000000
[  120.973379][    C0] R13: ffff8880aaf80100 R14: ffff8880aaf800f2 R15: ffff8880aaf80040
[  120.974410][    C0] FS:  00007f58e693f740(0000) GS:ffff8880d9c00000(0000) knlGS:0000000000000000
[  120.979794][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  120.980773][    C0] CR2: 00007ffcb8b38f29 CR3: 00000000afe8e001 CR4: 00000000000606f0
[  120.981945][    C0] Call Trace:
[  120.982411][    C0]  <IRQ>
[  120.982848][    C0]  ? hsr_add_node+0x8c0/0x8c0 [hsr]
[  120.983522][    C0]  ? rcu_read_lock_held+0x90/0xa0
[  120.984159][    C0]  ? rcu_read_lock_sched_held+0xc0/0xc0
[  120.984944][    C0]  hsr_handle_frame+0x1db/0x4e0 [hsr]
[  120.985597][    C0]  ? hsr_nl_nodedown+0x2b0/0x2b0 [hsr]
[  120.986289][    C0]  __netif_receive_skb_core+0x6bf/0x3170
[  120.992513][    C0]  ? check_chain_key+0x236/0x5d0
[  120.993223][    C0]  ? do_xdp_generic+0x1460/0x1460
[  120.993875][    C0]  ? register_lock_class+0x14d0/0x14d0
[  120.994609][    C0]  ? __netif_receive_skb_one_core+0x8d/0x160
[  120.995377][    C0]  __netif_receive_skb_one_core+0x8d/0x160
[  120.996204][    C0]  ? __netif_receive_skb_core+0x3170/0x3170
[ ... ]

Reported-by:  <syzbot+fcf5dd39282ceb27108d@syzkaller.appspotmail.com>
Fixes: c5a75911

 ("net/hsr: Use list_head (and rcu) instead of array for slave devices.")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

81494b38

Revert "drm/dp_mst: Skip validating ports during destruction, just ref" · 5778b9b2

Lyude Paul authored Nov 28, 2018

commit 9765635b upstream.

This reverts commit:

c54c7374

 ("drm/dp_mst: Skip validating ports during destruction, just ref")

ugh.

In drm_dp_destroy_connector_work(), we have a pretty good chance of
freeing the actual struct drm_dp_mst_port. However, after destroying
things we send a hotplug through (*mgr->cbs->hotplug)(mgr) which is
where the problems start.

For i915, this calls all the way down to the fbcon probing helpers,
which start trying to access the port in a modeset.

[   45.062001] ==================================================================
[   45.062112] BUG: KASAN: use-after-free in ex_handler_refcount+0x146/0x180
[   45.062196] Write of size 4 at addr ffff8882b4b70968 by task kworker/3:1/53

[   45.062325] CPU: 3 PID: 53 Comm: kworker/3:1 Kdump: loaded Tainted: G           O      4.20.0-rc4Lyude-Test+ #3
[   45.062442] Hardware name: LENOVO 20BWS1KY00/20BWS1KY00, BIOS JBET71WW (1.35 ) 09/14/2018
[   45.062554] Workqueue: events drm_dp_destroy_connector_work [drm_kms_helper]
[   45.062641] Call Trace:
[   45.062685]  dump_stack+0xbd/0x15a
[   45.062735]  ? dump_stack_print_info.cold.0+0x1b/0x1b
[   45.062801]  ? printk+0x9f/0xc5
[   45.062847]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
[   45.062909]  ? ex_handler_refcount+0x146/0x180
[   45.062970]  print_address_description+0x71/0x239
[   45.063036]  ? ex_handler_refcount+0x146/0x180
[   45.063095]  kasan_report.cold.5+0x242/0x30b
[   45.063155]  __asan_report_store4_noabort+0x1c/0x20
[   45.063313]  ex_handler_refcount+0x146/0x180
[   45.063371]  ? ex_handler_clear_fs+0xb0/0xb0
[   45.063428]  fixup_exception+0x98/0xd7
[   45.063484]  ? raw_notifier_call_chain+0x20/0x20
[   45.063548]  do_trap+0x6d/0x210
[   45.063605]  ? _GLOBAL__sub_I_65535_1_drm_dp_aux_unregister_devnode+0x2f/0x1c6 [drm_kms_helper]
[   45.063732]  do_error_trap+0xc0/0x170
[   45.063802]  ? _GLOBAL__sub_I_65535_1_drm_dp_aux_unregister_devnode+0x2f/0x1c6 [drm_kms_helper]
[   45.063929]  do_invalid_op+0x3b/0x50
[   45.063997]  ? _GLOBAL__sub_I_65535_1_drm_dp_aux_unregister_devnode+0x2f/0x1c6 [drm_kms_helper]
[   45.064103]  invalid_op+0x14/0x20
[   45.064162] RIP: 0010:_GLOBAL__sub_I_65535_1_drm_dp_aux_unregister_devnode+0x2f/0x1c6 [drm_kms_helper]
[   45.064274] Code: 00 48 c7 c7 80 fe 53 a0 48 89 e5 e8 5b 6f 26 e1 5d c3 48 8d 0e 0f 0b 48 8d 0b 0f 0b 48 8d 0f 0f 0b 48 8d 0f 0f 0b 49 8d 4d 00 <0f> 0b 49 8d 0e 0f 0b 48 8d 08 0f 0b 49 8d 4d 00 0f 0b 48 8d 0b 0f
[   45.064569] RSP: 0018:ffff8882b789ee10 EFLAGS: 00010282
[   45.064637] RAX: ffff8882af47ae70 RBX: ffff8882af47aa60 RCX: ffff8882b4b70968
[   45.064723] RDX: ffff8882af47ae70 RSI: 0000000000000008 RDI: ffff8882b788bdb8
[   45.064808] RBP: ffff8882b789ee28 R08: ffffed1056f13db4 R09: ffffed1056f13db3
[   45.064894] R10: ffffed1056f13db3 R11: ffff8882b789ed9f R12: ffff8882af47ad28
[   45.064980] R13: ffff8882b4b70968 R14: ffff8882acd86728 R15: ffff8882b4b75dc8
[   45.065084]  drm_dp_mst_reset_vcpi_slots+0x12/0x80 [drm_kms_helper]
[   45.065225]  intel_mst_disable_dp+0xda/0x180 [i915]
[   45.065361]  intel_encoders_disable.isra.107+0x197/0x310 [i915]
[   45.065498]  haswell_crtc_disable+0xbe/0x400 [i915]
[   45.065622]  ? i9xx_disable_plane+0x1c0/0x3e0 [i915]
[   45.065750]  intel_atomic_commit_tail+0x74e/0x3e60 [i915]
[   45.065884]  ? intel_pre_plane_update+0xbc0/0xbc0 [i915]
[   45.065968]  ? drm_atomic_helper_swap_state+0x88b/0x1d90 [drm_kms_helper]
[   45.066054]  ? kasan_check_write+0x14/0x20
[   45.066165]  ? i915_gem_track_fb+0x13a/0x330 [i915]
[   45.066277]  ? i915_sw_fence_complete+0xe9/0x140 [i915]
[   45.066406]  ? __i915_sw_fence_complete+0xc50/0xc50 [i915]
[   45.066540]  intel_atomic_commit+0x72e/0xef0 [i915]
[   45.066635]  ? drm_dev_dbg+0x200/0x200 [drm]
[   45.066764]  ? intel_atomic_commit_tail+0x3e60/0x3e60 [i915]
[   45.066898]  ? intel_atomic_commit_tail+0x3e60/0x3e60 [i915]
[   45.067001]  drm_atomic_commit+0xc4/0xf0 [drm]
[   45.067074]  restore_fbdev_mode_atomic+0x562/0x780 [drm_kms_helper]
[   45.067166]  ? drm_fb_helper_debug_leave+0x690/0x690 [drm_kms_helper]
[   45.067249]  ? kasan_check_read+0x11/0x20
[   45.067324]  restore_fbdev_mode+0x127/0x4b0 [drm_kms_helper]
[   45.067364]  ? kasan_check_read+0x11/0x20
[   45.067406]  drm_fb_helper_restore_fbdev_mode_unlocked+0x164/0x200 [drm_kms_helper]
[   45.067462]  ? drm_fb_helper_hotplug_event+0x30/0x30 [drm_kms_helper]
[   45.067508]  ? kasan_check_write+0x14/0x20
[   45.070360]  ? mutex_unlock+0x22/0x40
[   45.073748]  drm_fb_helper_set_par+0xb2/0xf0 [drm_kms_helper]
[   45.075846]  drm_fb_helper_hotplug_event.part.33+0x1cd/0x290 [drm_kms_helper]
[   45.078088]  drm_fb_helper_hotplug_event+0x1c/0x30 [drm_kms_helper]
[   45.082614]  intel_fbdev_output_poll_changed+0x9f/0x140 [i915]
[   45.087069]  drm_kms_helper_hotplug_event+0x67/0x90 [drm_kms_helper]
[   45.089319]  intel_dp_mst_hotplug+0x37/0x50 [i915]
[   45.091496]  drm_dp_destroy_connector_work+0x510/0x6f0 [drm_kms_helper]
[   45.093675]  ? drm_dp_update_payload_part1+0x1220/0x1220 [drm_kms_helper]
[   45.095851]  ? kasan_check_write+0x14/0x20
[   45.098473]  ? kasan_check_read+0x11/0x20
[   45.101155]  ? strscpy+0x17c/0x530
[   45.103808]  ? __switch_to_asm+0x34/0x70
[   45.106456]  ? syscall_return_via_sysret+0xf/0x7f
[   45.109711]  ? read_word_at_a_time+0x20/0x20
[   45.113138]  ? __switch_to_asm+0x40/0x70
[   45.116529]  ? __switch_to_asm+0x34/0x70
[   45.119891]  ? __switch_to_asm+0x40/0x70
[   45.123224]  ? __switch_to_asm+0x34/0x70
[   45.126540]  ? __switch_to_asm+0x34/0x70
[   45.129824]  process_one_work+0x88d/0x15d0
[   45.133172]  ? pool_mayday_timeout+0x850/0x850
[   45.136459]  ? pci_mmcfg_check_reserved+0x110/0x128
[   45.139739]  ? wake_q_add+0xb0/0xb0
[   45.143010]  ? check_preempt_wakeup+0x652/0x1050
[   45.146304]  ? worker_enter_idle+0x29e/0x740
[   45.149589]  ? __schedule+0x1ec0/0x1ec0
[   45.152937]  ? kasan_check_read+0x11/0x20
[   45.156179]  ? _raw_spin_lock_irq+0xa3/0x130
[   45.159382]  ? _raw_read_unlock_irqrestore+0x30/0x30
[   45.162542]  ? kasan_check_write+0x14/0x20
[   45.165657]  worker_thread+0x1a5/0x1470
[   45.168725]  ? set_load_weight+0x2e0/0x2e0
[   45.171755]  ? process_one_work+0x15d0/0x15d0
[   45.174806]  ? __switch_to_asm+0x34/0x70
[   45.177645]  ? __switch_to_asm+0x40/0x70
[   45.180323]  ? __switch_to_asm+0x34/0x70
[   45.182936]  ? __switch_to_asm+0x40/0x70
[   45.185539]  ? __switch_to_asm+0x34/0x70
[   45.188100]  ? __switch_to_asm+0x40/0x70
[   45.190628]  ? __schedule+0x7d4/0x1ec0
[   45.193143]  ? save_stack+0xa9/0xd0
[   45.195632]  ? kasan_check_write+0x10/0x20
[   45.198162]  ? kasan_kmalloc+0xc4/0xe0
[   45.200609]  ? kmem_cache_alloc_trace+0xdd/0x190
[   45.203046]  ? kthread+0x9f/0x3b0
[   45.205470]  ? ret_from_fork+0x35/0x40
[   45.207876]  ? unwind_next_frame+0x43/0x50
[   45.210273]  ? __save_stack_trace+0x82/0x100
[   45.212658]  ? deactivate_slab.isra.67+0x3d4/0x580
[   45.215026]  ? default_wake_function+0x35/0x50
[   45.217399]  ? kasan_check_read+0x11/0x20
[   45.219825]  ? _raw_spin_lock_irqsave+0xae/0x140
[   45.222174]  ? __lock_text_start+0x8/0x8
[   45.224521]  ? replenish_dl_entity.cold.62+0x4f/0x4f
[   45.226868]  ? __kthread_parkme+0x87/0xf0
[   45.229200]  kthread+0x2f7/0x3b0
[   45.231557]  ? process_one_work+0x15d0/0x15d0
[   45.233923]  ? kthread_park+0x120/0x120
[   45.236249]  ret_from_fork+0x35/0x40

[   45.240875] Allocated by task 242:
[   45.243136]  save_stack+0x43/0xd0
[   45.245385]  kasan_kmalloc+0xc4/0xe0
[   45.247597]  kmem_cache_alloc_trace+0xdd/0x190
[   45.249793]  drm_dp_add_port+0x1e0/0x2170 [drm_kms_helper]
[   45.252000]  drm_dp_send_link_address+0x4a7/0x740 [drm_kms_helper]
[   45.254389]  drm_dp_check_and_send_link_address+0x1a7/0x210 [drm_kms_helper]
[   45.256803]  drm_dp_mst_link_probe_work+0x6f/0xb0 [drm_kms_helper]
[   45.259200]  process_one_work+0x88d/0x15d0
[   45.261597]  worker_thread+0x1a5/0x1470
[   45.264038]  kthread+0x2f7/0x3b0
[   45.266371]  ret_from_fork+0x35/0x40

[   45.270937] Freed by task 53:
[   45.273170]  save_stack+0x43/0xd0
[   45.275382]  __kasan_slab_free+0x139/0x190
[   45.277604]  kasan_slab_free+0xe/0x10
[   45.279826]  kfree+0x99/0x1b0
[   45.282044]  drm_dp_free_mst_port+0x4a/0x60 [drm_kms_helper]
[   45.284330]  drm_dp_destroy_connector_work+0x43e/0x6f0 [drm_kms_helper]
[   45.286660]  process_one_work+0x88d/0x15d0
[   45.288934]  worker_thread+0x1a5/0x1470
[   45.291231]  kthread+0x2f7/0x3b0
[   45.293547]  ret_from_fork+0x35/0x40

[   45.298206] The buggy address belongs to the object at ffff8882b4b70968
                which belongs to the cache kmalloc-2k of size 2048
[   45.303047] The buggy address is located 0 bytes inside of
                2048-byte region [ffff8882b4b70968, ffff8882b4b71168)
[   45.308010] The buggy address belongs to the page:
[   45.310477] page:ffffea000ad2dc00 count:1 mapcount:0 mapping:ffff8882c080cf40 index:0x0 compound_mapcount: 0
[   45.313051] flags: 0x8000000000010200(slab|head)
[   45.315635] raw: 8000000000010200 ffffea000aac2808 ffffea000abe8608 ffff8882c080cf40
[   45.318300] raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000
[   45.320966] page dumped because: kasan: bad access detected

[   45.326312] Memory state around the buggy address:
[   45.329085]  ffff8882b4b70800: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   45.331845]  ffff8882b4b70880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   45.334584] >ffff8882b4b70900: fc fc fc fc fc fc fc fc fc fc fc fc fc fb fb fb
[   45.337302]                                                           ^
[   45.340061]  ffff8882b4b70980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   45.342910]  ffff8882b4b70a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   45.345748] ==================================================================

So, this definitely isn't a fix that we want. This being said; there's
no real easy fix for this problem because of some of the catch-22's of
the MST helpers current design. For starters; we always need to validate
a port with drm_dp_get_validated_port_ref(), but validation relies on
the lifetime of the port in the actual topology. So once the port is
gone, it can't be validated again.

If we were to try to make the payload helpers not use port validation,
then we'd cause another problem: if the port isn't validated, it could
be freed and we'd just start causing more KASAN issues. There are
already hacks that attempt to workaround this in
drm_dp_mst_destroy_connector_work() by re-initializing the kref so that
it can be used again and it's memory can be freed once the VCPI helpers
finish removing the port's respective payloads. But none of these really
do anything helpful since the port still can't be validated since it's
gone from the topology. Also, that workaround is immensely confusing to
read through.

What really needs to be done in order to fix this is to teach DRM how to
track the lifetime of the structs for MST ports and branch devices
separately from their lifetime in the actual topology. Simply put; this
means having two different krefs-one that removes the port/branch device
from the topology, and one that finally calls kfree(). This would let us
simplify things, since we'd now be able to keep ports around without
having to keep them in the topology at the same time, which is exactly
what we need in order to teach our VCPI helpers to only validate ports
when it's actually necessary without running the risk of trying to use
unallocated memory.

Such a fix is on it's way, but for now let's play it safe and just
revert this. If this bug has been around for well over a year, we can
wait a little while to get an actual proper fix here.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: c54c7374

 ("drm/dp_mst: Skip validating ports during destruction, just ref")
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Sean Paul <sean@poorly.run>
Cc: Jerry Zuo <Jerry.Zuo@amd.com>
Cc: Harry Wentland <Harry.Wentland@amd.com>
Cc: stable@vger.kernel.org # v4.6+
Acked-by: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20181128210005.24434-1-lyude@redhat.com
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

5778b9b2

arm64: smp: fix smp_send_stop() behaviour · 0ac191b4

Cristian Marussi authored Mar 11, 2020

commit d0bab0c3 upstream.

On a system with only one CPU online, when another one CPU panics while
starting-up, smp_send_stop() will fail to send any STOP message to the
other already online core, resulting in a system still responsive and
alive at the end of the panic procedure.

[  186.700083] CPU3: shutdown
[  187.075462] CPU2: shutdown
[  187.162869] CPU1: shutdown
[  188.689998] ------------[ cut here ]------------
[  188.691645] kernel BUG at arch/arm64/kernel/cpufeature.c:886!
[  188.692079] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[  188.692444] Modules linked in:
[  188.693031] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.6.0-rc4-00001-g338d25c35a98 #104
[  188.693175] Hardware name: Foundation-v8A (DT)
[  188.693492] pstate: 200001c5 (nzCv dAIF -PAN -UAO)
[  188.694183] pc : has_cpuid_feature+0xf0/0x348
[  188.694311] lr : verify_local_elf_hwcaps+0x84/0xe8
[  188.694410] sp : ffff800011b1bf60
[  188.694536] x29: ffff800011b1bf60 x28: 0000000000000000
[  188.694707] x27: 0000000000000000 x26: 0000000000000000
[  188.694801] x25: 0000000000000000 x24: ffff80001189a25c
[  188.694905] x23: 0000000000000000 x22: 0000000000000000
[  188.694996] x21: ffff8000114aa018 x20: ffff800011156a38
[  188.695089] x19: ffff800010c944a0 x18: 0000000000000004
[  188.695187] x17: 0000000000000000 x16: 0000000000000000
[  188.695280] x15: 0000249dbde5431e x14: 0262cbe497efa1fa
[  188.695371] x13: 0000000000000002 x12: 0000000000002592
[  188.695472] x11: 0000000000000080 x10: 00400032b5503510
[  188.695572] x9 : 0000000000000000 x8 : ffff800010c80204
[  188.695659] x7 : 00000000410fd0f0 x6 : 0000000000000001
[  188.695750] x5 : 00000000410fd0f0 x4 : 0000000000000000
[  188.695836] x3 : 0000000000000000 x2 : ffff8000100939d8
[  188.695919] x1 : 0000000000180420 x0 : 0000000000180480
[  188.696253] Call trace:
[  188.696410]  has_cpuid_feature+0xf0/0x348
[  188.696504]  verify_local_elf_hwcaps+0x84/0xe8
[  188.696591]  check_local_cpu_capabilities+0x44/0x128
[  188.696666]  secondary_start_kernel+0xf4/0x188
[  188.697150] Code: 52805001 72a00301 6b01001f 54000ec0 (d4210000)
[  188.698639] ---[ end trace 3f12ca47652f7b72 ]---
[  188.699160] Kernel panic - not syncing: Attempted to kill the idle task!
[  188.699546] Kernel Offset: disabled
[  188.699828] CPU features: 0x00004,20c02008
[  188.700012] Memory Limit: none
[  188.700538] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

[root@arch ~]# echo Helo
Helo
[root@arch ~]# cat /proc/cpuinfo | grep proce
processor	: 0

Make smp_send_stop() account also for the online status of the calling CPU
while evaluating how many CPUs are effectively online: this way, the right
number of STOPs is sent, so enforcing a proper freeze of the system at the
end of panic even under the above conditions.

Fixes: 08e875c1

 ("arm64: SMP support")
Reported-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0ac191b4

ALSA: hda/realtek: Fix pop noise on ALC225 · c6048afa

Kai-Heng Feng authored Mar 11, 2020

commit 3b36b13d upstream.

Commit 317d9313 ("ALSA: hda/realtek - Set default power save node to
0") makes the ALC225 have pop noise on S3 resume and cold boot.

So partially revert this commit for ALC225 to fix the regression.

Fixes: 317d9313

 ("ALSA: hda/realtek - Set default power save node to 0")
BugLink: https://bugs.launchpad.net/bugs/1866357
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20200311061328.17614-1-kai.heng.feng@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

c6048afa

futex: Unbreak futex hashing · 9679d496

Thomas Gleixner authored Mar 08, 2020

commit 8d677436 upstream.

The recent futex inode life time fix changed the ordering of the futex key
union struct members, but forgot to adjust the hash function accordingly,

As a result the hashing omits the leading 64bit and even hashes beyond the
futex key causing a bad hash distribution which led to a ~100% performance
regression.

Hand in the futex key pointer instead of a random struct member and make
the size calculation based of the struct offset.

Fixes: 8019ad13

 ("futex: Fix inode life-time issue")
Reported-by: Rong Chen <rong.a.chen@intel.com>
Decoded-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Rong Chen <rong.a.chen@intel.com>
Link: https://lkml.kernel.org/r/87h7yy90ve.fsf@nanos.tec.linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

9679d496

futex: Fix inode life-time issue · 24bbfe34

Peter Zijlstra authored Mar 04, 2020

commit 8019ad13

 upstream.

As reported by Jann, ihold() does not in fact guarantee inode
persistence. And instead of making it so, replace the usage of inode
pointers with a per boot, machine wide, unique inode identifier.

This sequence number is global, but shared (file backed) futexes are
rare enough that this should not become a performance issue.

Reported-by: Jann Horn <jannh@google.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

24bbfe34

kbuild: Disable -Wpointer-to-enum-cast · 69b28a54

Nathan Chancellor authored Mar 11, 2020

commit 82f2bc2f

 upstream.

Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when
casting to enums. The kernel does this in certain places, such as device
tree matches to set the version of the device being used, which allows
the kernel to avoid using a gigantic union.

https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428
https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402
https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264

To avoid a ton of false positive warnings, disable this particular part
of the warning, which has been split off into a separate diagnostic so
that the entire warning does not need to be turned off for clang. It
will be visible under W=1 in case people want to go about fixing these
easily and enabling the warning treewide.

Cc: stable@vger.kernel.org
Link: https://github.com/ClangBuiltLinux/linux/issues/887
Link: https://github.com/llvm/llvm-project/commit/2a41b31fcdfcb67ab7038fc2ffb606fd50b83a84
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

69b28a54

USB: cdc-acm: fix rounding error in TIOCSSERIAL · f256a348

Anthony Mallet authored Mar 12, 2020

[ Upstream commit b401f8c4 ]

By default, tty_port_init() initializes those parameters to a multiple
of HZ. For instance in line 69 of tty_port.c:
   port->close_delay = (50 * HZ) / 100;
https://github.com/torvalds/linux/blob/master/drivers/tty/tty_port.c#L69

With e.g. CONFIG_HZ = 250 (as this is the case for Ubuntu 18.04
linux-image-4.15.0-37-generic), the default setting for close_delay is
thus 125.

When ioctl(fd, TIOCGSERIAL, &s) is executed, the setting returned in
user space is '12' (125/10). When ioctl(fd, TIOCSSERIAL, &s) is then
executed with the same setting '12', the value is interpreted as '120'
which is different from the current setting and a EPERM error may be
raised by set_serial_info() if !CAP_SYS_ADMIN.
https://github.com/torvalds/linux/blob/master/drivers/usb/class/cdc-acm.c#L919

Fixes: ba2d8ce9

 ("cdc-acm: implement TIOCSSERIAL to avoid blocking close(2)")
Signed-off-by: Anthony Mallet <anthony.mallet@laas.fr>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200312133101.7096-2-anthony.mallet@laas.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

f256a348

USB: cdc-acm: fix close_delay and closing_wait units in TIOCSSERIAL · 873c82d3

Anthony Mallet authored Mar 12, 2020

[ Upstream commit 633e2b2d

 ]

close_delay and closing_wait are specified in hundredth of a second but stored
internally in jiffies. Use the jiffies_to_msecs() and msecs_to_jiffies()
functions to convert from each other.

Signed-off-by: Anthony Mallet <anthony.mallet@laas.fr>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200312133101.7096-1-anthony.mallet@laas.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

873c82d3

x86/mm: split vmalloc_sync_all() · b416d439

Joerg Roedel authored Mar 21, 2020

commit 763802b5 upstream.

Commit 3f8fd02b ("mm/vmalloc: Sync unmappings in
__purge_vmap_area_lazy()") introduced a call to vmalloc_sync_all() in
the vunmap() code-path.  While this change was necessary to maintain
correctness on x86-32-pae kernels, it also adds additional cycles for
architectures that don't need it.

Specifically on x86-64 with CONFIG_VMAP_STACK=y some people reported
severe performance regressions in micro-benchmarks because it now also
calls the x86-64 implementation of vmalloc_sync_all() on vunmap().  But
the vmalloc_sync_all() implementation on x86-64 is only needed for newly
created mappings.

To avoid the unnecessary work on x86-64 and to gain the performance
back, split up vmalloc_sync_all() into two functions:

	* vmalloc_sync_mappings(), and
	* vmalloc_sync_unmappings()

Most call-sites to vmalloc_sync_all() only care about new mappings being
synchronized.  The only exception is the new call-site added in the
above mentioned commit.

Shile Zhang directed us to a report of an 80% regression in reaim
throughput.

Fixes: 3f8fd02b

 ("mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy()")
Reported-by: kernel test robot <oliver.sang@intel.com>
Reported-by: Shile Zhang <shile.zhang@linux.alibaba.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Borislav Petkov <bp@suse.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>	[GHES]
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20191009124418.8286-1-joro@8bytes.org
Link: https://lists.01.org/hyperkitty/list/lkp@lists.01.org/thread/4D3JPPHBNOSPFK2KEPC6KGKS6J25AIDB/
Link: http://lkml.kernel.org/r/20191113095530.228959-1-shile.zhang@linux.alibaba.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

b416d439

mm, slub: prevent kmalloc_node crashes and memory leaks · c39e3022

Vlastimil Babka authored Mar 21, 2020

commit 0715e6c5 upstream.

Sachin reports [1] a crash in SLUB __slab_alloc():

  BUG: Kernel NULL pointer dereference on read at 0x000073b0
  Faulting instruction address: 0xc0000000003d55f4
  Oops: Kernel access of bad area, sig: 11 [#1]
  LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
  Modules linked in:
  CPU: 19 PID: 1 Comm: systemd Not tainted 5.6.0-rc2-next-20200218-autotest #1
  NIP:  c0000000003d55f4 LR: c0000000003d5b94 CTR: 0000000000000000
  REGS: c0000008b37836d0 TRAP: 0300   Not tainted  (5.6.0-rc2-next-20200218-autotest)
  MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24004844  XER: 00000000
  CFAR: c00000000000dec4 DAR: 00000000000073b0 DSISR: 40000000 IRQMASK: 1
  GPR00: c0000000003d5b94 c0000008b3783960 c00000000155d400 c0000008b301f500
  GPR04: 0000000000000dc0 0000000000000002 c0000000003443d8 c0000008bb398620
  GPR08: 00000008ba2f0000 0000000000000001 0000000000000000 0000000000000000
  GPR12: 0000000024004844 c00000001ec52a00 0000000000000000 0000000000000000
  GPR16: c0000008a1b20048 c000000001595898 c000000001750c18 0000000000000002
  GPR20: c000000001750c28 c000000001624470 0000000fffffffe0 5deadbeef0000122
  GPR24: 0000000000000001 0000000000000dc0 0000000000000002 c0000000003443d8
  GPR28: c0000008b301f500 c0000008bb398620 0000000000000000 c00c000002287180
  NIP ___slab_alloc+0x1f4/0x760
  LR __slab_alloc+0x34/0x60
  Call Trace:
    ___slab_alloc+0x334/0x760 (unreliable)
    __slab_alloc+0x34/0x60
    __kmalloc_node+0x110/0x490
    kvmalloc_node+0x58/0x110
    mem_cgroup_css_online+0x108/0x270
    online_css+0x48/0xd0
    cgroup_apply_control_enable+0x2ec/0x4d0
    cgroup_mkdir+0x228/0x5f0
    kernfs_iop_mkdir+0x90/0xf0
    vfs_mkdir+0x110/0x230
    do_mkdirat+0xb0/0x1a0
    system_call+0x5c/0x68

This is a PowerPC platform with following NUMA topology:

  available: 2 nodes (0-1)
  node 0 cpus:
  node 0 size: 0 MB
  node 0 free: 0 MB
  node 1 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
  node 1 size: 35247 MB
  node 1 free: 30907 MB
  node distances:
  node   0   1
    0:  10  40
    1:  40  10

  possible numa nodes: 0-31

This only happens with a mmotm patch "mm/memcontrol.c: allocate
shrinker_map on appropriate NUMA node" [2] which effectively calls
kmalloc_node for each possible node.  SLUB however only allocates
kmem_cache_node on online N_NORMAL_MEMORY nodes, and relies on
node_to_mem_node to return such valid node for other nodes since commit
a561ce00 ("slub: fall back to node_to_mem_node() node if allocating
on memoryless node").  This is however not true in this configuration
where the _node_numa_mem_ array is not initialized for nodes 0 and 2-31,
thus it contains zeroes and get_partial() ends up accessing
non-allocated kmem_cache_node.

A related issue was reported by Bharata (originally by Ramachandran) [3]
where a similar PowerPC configuration, but with mainline kernel without
patch [2] ends up allocating large amounts of pages by kmalloc-1k
kmalloc-512.  This seems to have the same underlying issue with
node_to_mem_node() not behaving as expected, and might probably also
lead to an infinite loop with CONFIG_SLUB_CPU_PARTIAL [4].

This patch should fix both issues by not relying on node_to_mem_node()
anymore and instead simply falling back to NUMA_NO_NODE, when
kmalloc_node(node) is attempted for a node that's not online, or has no
usable memory.  The "usable memory" condition is also changed from
node_present_pages() to N_NORMAL_MEMORY node state, as that is exactly
the condition that SLUB uses to allocate kmem_cache_node structures.
The check in get_partial() is removed completely, as the checks in
___slab_alloc() are now sufficient to prevent get_partial() being
reached with an invalid node.

[1] https://lore.kernel.org/linux-next/3381CD91-AB3D-4773-BA04-E7A072A63968@linux.vnet.ibm.com/
[2] https://lore.kernel.org/linux-mm/fff0e636-4c36-ed10-281c-8cdb0687c839@virtuozzo.com/
[3] https://lore.kernel.org/linux-mm/20200317092624.GB22538@in.ibm.com/
[4] https://lore.kernel.org/linux-mm/088b5996-faae-8a56-ef9c-5b567125ae54@suse.cz/

Fixes: a561ce00

 ("slub: fall back to node_to_mem_node() node if allocating on memoryless node")
Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Reported-by: PUVICHAKRAVARTHY RAMACHANDRAN <puvichakravarthy@in.ibm.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Christopher Lameter <cl@linux.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Nathan Lynch <nathanl@linux.ibm.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200320115533.9604-1-vbabka@suse.cz
Debugged-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

c39e3022

mm: slub: be more careful about the double cmpxchg of freelist · 928291dc

Linus Torvalds authored Mar 17, 2020

commit 5076190d upstream.

This is just a cleanup addition to Jann's fix to properly update the
transaction ID for the slub slowpath in commit fd4d9c7d

 ("mm: slub:
add missing TID bump..").

The transaction ID is what protects us against any concurrent accesses,
but we should really also make sure to make the 'freelist' comparison
itself always use the same freelist value that we then used as the new
next free pointer.

Jann points out that if we do all of this carefully, we could skip the
transaction ID update for all the paths that only remove entries from
the lists, and only update the TID when adding entries (to avoid the ABA
issue with cmpxchg and list handling re-adding a previously seen value).

But this patch just does the "make sure to cmpxchg the same value we
used" rather than then try to be clever.

Acked-by: Jann Horn <jannh@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

928291dc

memcg: fix NULL pointer dereference in __mem_cgroup_usage_unregister_event · 4ef3a0d9

Chunguang Xu authored Mar 21, 2020

commit 7d36665a upstream.

An eventfd monitors multiple memory thresholds of the cgroup, closes them,
the kernel deletes all events related to this eventfd.  Before all events
are deleted, another eventfd monitors the memory threshold of this cgroup,
leading to a crash:

  BUG: kernel NULL pointer dereference, address: 0000000000000004
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  PGD 800000033058e067 P4D 800000033058e067 PUD 3355ce067 PMD 0
  Oops: 0002 [#1] SMP PTI
  CPU: 2 PID: 14012 Comm: kworker/2:6 Kdump: loaded Not tainted 5.6.0-rc4 #3
  Hardware name: LENOVO 20AWS01K00/20AWS01K00, BIOS GLET70WW (2.24 ) 05/21/2014
  Workqueue: events memcg_event_remove
  RIP: 0010:__mem_cgroup_usage_unregister_event+0xb3/0x190
  RSP: 0018:ffffb47e01c4fe18 EFLAGS: 00010202
  RAX: 0000000000000001 RBX: ffff8bb223a8a000 RCX: 0000000000000001
  RDX: 0000000000000001 RSI: ffff8bb22fb83540 RDI: 0000000000000001
  RBP: ffffb47e01c4fe48 R08: 0000000000000000 R09: 0000000000000010
  R10: 000000000000000c R11: 071c71c71c71c71c R12: ffff8bb226aba880
  R13: ffff8bb223a8a480 R14: 0000000000000000 R15: 0000000000000000
  FS:  0000000000000000(0000) GS:ffff8bb242680000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000004 CR3: 000000032c29c003 CR4: 00000000001606e0
  Call Trace:
    memcg_event_remove+0x32/0x90
    process_one_work+0x172/0x380
    worker_thread+0x49/0x3f0
    kthread+0xf8/0x130
    ret_from_fork+0x35/0x40
  CR2: 0000000000000004

We can reproduce this problem in the following ways:

1. We create a new cgroup subdirectory and a new eventfd, and then we
   monitor multiple memory thresholds of the cgroup through this eventfd.

2.  closing this eventfd, and __mem_cgroup_usage_unregister_event ()
   will be called multiple times to delete all events related to this
   eventfd.

The first time __mem_cgroup_usage_unregister_event() is called, the
kernel will clear all items related to this eventfd in thresholds->
primary.

Since there is currently only one eventfd, thresholds-> primary becomes
empty, so the kernel will set thresholds-> primary and hresholds-> spare
to NULL.  If at this time, the user creates a new eventfd and monitor
the memory threshold of this cgroup, kernel will re-initialize
thresholds-> primary.

Then when __mem_cgroup_usage_unregister_event () is called for the
second time, because thresholds-> primary is not empty, the system will
access thresholds-> spare, but thresholds-> spare is NULL, which will
trigger a crash.

In general, the longer it takes to delete all events related to this
eventfd, the easier it is to trigger this problem.

The solution is to check whether the thresholds associated with the
eventfd has been cleared when deleting the event.  If so, we do nothing.

[akpm@linux-foundation.org: fix comment, per Kirill]
Fixes: 907860ed

 ("cgroups: make cftype.unregister_event() void-returning")
Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/077a6f67-aefa-4591-efec-f2f3af2b0b02@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4ef3a0d9

rtc: max8907: add missing select REGMAP_IRQ · 66478153

Corentin Labbe authored Mar 18, 2020

commit 5d892919 upstream.

I have hit the following build error:

  armv7a-hardfloat-linux-gnueabi-ld: drivers/rtc/rtc-max8907.o: in function `max8907_rtc_probe':
  rtc-max8907.c:(.text+0x400): undefined reference to `regmap_irq_get_virq'

max8907 should select REGMAP_IRQ

Fixes: 94c01ab6

 ("rtc: add MAX8907 RTC driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

66478153

intel_th: Fix user-visible error codes · 369dacc3

Alexander Shishkin authored Mar 17, 2020

commit ce666be8

 upstream.

There are a few places in the driver that end up returning ENOTSUPP to
the user, replace those with EINVAL.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Fixes: ba82664c

 ("intel_th: Add Memory Storage Unit driver")
Cc: stable@vger.kernel.org # v4.4+
Link: https://lore.kernel.org/r/20200317062215.15598-6-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

369dacc3

staging/speakup: fix get_word non-space look-ahead · 9ddb6c7b

Samuel Thibault authored Mar 06, 2020

commit 9d32c0cd

 upstream.

get_char was erroneously given the address of the pointer to the text
instead of the address of the text, thus leading to random crashes when
the user requests speaking a word while the current position is on a space
character and say_word_ctl is not enabled.

Reported-on: https://github.com/bytefire/speakup/issues/1
Reported-by: Kirk Reiser <kirk@reisers.ca>
Reported-by: Janina Sajka <janina@rednote.net>
Reported-by: Alexandr Epaneshnikov <aarnaarn2@gmail.com>
Reported-by: Gregory Nowak <greg@gregn.net>
Reported-by: deedra waters <deedra@the-brannons.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Tested-by: Alexandr Epaneshnikov <aarnaarn2@gmail.com>
Tested-by: Gregory Nowak <greg@gregn.net>
Tested-by: Michael Taboada <michael@michaels.world>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200306003047.thijtmqrnayd3dmw@function
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

9ddb6c7b

staging: rtl8188eu: Add device id for MERCUSYS MW150US v2 · 3ec88964

Michael Straube authored Mar 12, 2020

commit bb5786b9

 upstream.

This device was added to the stand-alone driver on github.
Add it to the staging driver as well.

Link: https://github.com/lwfinger/rtl8188eu/commit/2141f244c3e7
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200312093652.13918-1-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3ec88964

ALSA: pcm: oss: Remove WARNING from snd_pcm_plug_alloc() checks · 8b9c188a

Takashi Iwai authored Mar 12, 2020

commit 5461e053

 upstream.

The return value checks in snd_pcm_plug_alloc() are covered with
snd_BUG_ON() macro that may trigger a kernel WARNING depending on the
kconfig.  But since the error condition can be triggered by a weird
user space parameter passed to OSS layer, we shouldn't give the kernel
stack trace just for that.  As it's a normal error condition, let's
remove snd_BUG_ON() macro usage there.

Reported-by:  <syzbot+2a59ee7a9831b264f45e@syzkaller.appspotmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200312155730.7520-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

8b9c188a

ALSA: pcm: oss: Avoid plugin buffer overflow · 7968139b

Takashi Iwai authored Mar 09, 2020

commit f2ecf903

 upstream.

Each OSS PCM plugins allocate its internal buffer per pre-calculation
of the max buffer size through the chain of plugins (calling
src_frames and dst_frames callbacks).  This works for most plugins,
but the rate plugin might behave incorrectly.  The calculation in the
rate plugin involves with the fractional position, i.e. it may vary
depending on the input position.  Since the buffer size
pre-calculation is always done with the offset zero, it may return a
shorter size than it might be; this may result in the out-of-bound
access as spotted by fuzzer.

This patch addresses those possible buffer overflow accesses by simply
setting the upper limit per the given buffer size for each plugin
before src_frames() and after dst_frames() calls.

Reported-by:  <syzbot+e1fe9f44fb8ecf4fb5dd@syzkaller.appspotmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/000000000000b25ea005a02bcf21@google.com
Link: https://lore.kernel.org/r/20200309082148.19855-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

7968139b

ALSA: seq: oss: Fix running status after receiving sysex · 62347959

Takashi Iwai authored Mar 16, 2020

commit 6c3171ef

 upstream.

This is a similar bug like the previous case for virmidi: the invalid
running status is kept after receiving a sysex message.

Again the fix is to clear the running status after handling the sysex.

Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/3b4a4e0f232b7afbaf0a843f63d0e538e3029bfd.camel@domdv.de
Link: https://lore.kernel.org/r/20200316090506.23966-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

62347959

ALSA: seq: virmidi: Fix running status after receiving sysex · 201f079f

Takashi Iwai authored Mar 16, 2020

commit 4384f167

 upstream.

The virmidi driver handles sysex event exceptionally in a short-cut
snd_seq_dump_var_event() call, but this missed the reset of the
running status.  As a result, it may lead to an incomplete command
right after the sysex when an event with the same running status was
queued.

Fix it by clearing the running status properly via alling
snd_midi_event_reset_decode() for that code path.

Reported-by: Andreas Steinmetz <ast@domdv.de>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/3b4a4e0f232b7afbaf0a843f63d0e538e3029bfd.camel@domdv.de
Link: https://lore.kernel.org/r/20200316090506.23966-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

201f079f

ALSA: line6: Fix endless MIDI read loop · 9bf9e451

Takashi Iwai authored Mar 09, 2020

commit d683469b

 upstream.

The MIDI input event parser of the LINE6 driver may enter into an
endless loop when the unexpected data sequence is given, as it tries
to continue the secondary bytes without termination.  Also, when the
input data is too short, the parser returns a negative error, while
the caller doesn't handle it properly.  This would lead to the
unexpected behavior as well.

This patch addresses those issues by checking the return value
correctly and handling the one-byte event in the parser properly.

The bug was reported by syzkaller.

Reported-by:  <syzbot+cce32521ee0a824c21f7@syzkaller.appspotmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/000000000000033087059f8f8fa3@google.com
Link: https://lore.kernel.org/r/20200309095922.30269-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

9bf9e451

USB: serial: pl2303: add device-id for HP LD381 · 384874d0

Scott Chen authored Mar 11, 2020

commit cecc113c

 upstream.

Add a device id for HP LD381 Display
LD381:   03f0:0f7f

Signed-off-by: Scott Chen <scott@labau.com.tw>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

384874d0

usb: host: xhci-plat: add a shutdown · da117f84

Ran Wang authored Mar 06, 2020

commit b433e340

 upstream.

When loading new kernel via kexec, we need to shutdown host controller to
avoid any un-expected memory accessing during new kernel boot.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
Cc: stable <stable@vger.kernel.org>
Tested-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Peter Chen <peter.chen@nxp.com>
Link: https://lore.kernel.org/r/20200306092328.41253-1-ran.wang_1@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

da117f84

USB: serial: option: add ME910G1 ECM composition 0x110b · f1b59572

Daniele Palmas authored Mar 04, 2020

commit 8e852a79

 upstream.

Add ME910G1 ECM composition 0x110b: tty, tty, tty, ecm

Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Link: https://lore.kernel.org/r/20200304104310.2938-1-dnlplm@gmail.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

f1b59572

usb: quirks: add NO_LPM quirk for RTL8153 based ethernet adapters · dc4e351e

Hans de Goede authored Mar 13, 2020

commit 75d7676e

 upstream.

We have been receiving bug reports that ethernet connections over
RTL8153 based ethernet adapters stops working after a while with
errors like these showing up in dmesg when the ethernet stops working:

[12696.189484] r8152 6-1:1.0 enp10s0u1: Tx timeout
[12702.333456] r8152 6-1:1.0 enp10s0u1: Tx timeout
[12707.965422] r8152 6-1:1.0 enp10s0u1: Tx timeout

This has been reported on Dell WD15 docks, Belkin USB-C Express Dock 3.1
docks and with generic USB to ethernet dongles using the RTL8153
chipsets. Some users have tried adding usbcore.quirks=0bda:8153:k to
the kernel commandline and all users who have tried this report that
this fixes this.

Also note that we already have an existing NO_LPM quirk for the RTL8153
used in the Microsoft Surface Dock (where it uses a different usb-id).

This commit adds a NO_LPM quirk for the generic Realtek RTL8153
0bda:8153 usb-id, fixing the Tx timeout errors on these devices.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=198931
Cc: stable@vger.kernel.org
Cc: russianneuromancer@ya.ru
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200313120708.100339-1-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

dc4e351e

USB: Disable LPM on WD19's Realtek Hub · c478eabd

Kai-Heng Feng authored Feb 05, 2020

commit b63e48fb

 upstream.

Realtek Hub (0bda:0x0487) used in Dell Dock WD19 sometimes drops off the
bus when bringing underlying ports from U3 to U0.

Disabling LPM on the hub during setting link state is not enough, so
let's disable LPM completely for this hub.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200205112633.25995-3-kai.heng.feng@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

c478eabd

altera-stapl: altera_get_note: prevent write beyond end of 'key' · 63cb7373

Daniel Axtens authored Feb 25, 2020

[ Upstream commit 3745488e

 ]

altera_get_note is called from altera_init, where key is kzalloc(33).

When the allocation functions are annotated to allow the compiler to see
the sizes of objects, and with FORTIFY_SOURCE, we see:

In file included from drivers/misc/altera-stapl/altera.c:14:0:
In function ‘strlcpy’,
    inlined from ‘altera_init’ at drivers/misc/altera-stapl/altera.c:2189:5:
include/linux/string.h:378:4: error: call to ‘__write_overflow’ declared with attribute error: detected write beyond size of object passed as 1st parameter
    __write_overflow();
    ^~~~~~~~~~~~~~~~~~

That refers to this code in altera_get_note:

    if (key != NULL)
            strlcpy(key, &p[note_strings +
                            get_unaligned_be32(
                            &p[note_table + (8 * i)])],
                    length);

The error triggers because the length of 'key' is 33, but the copy
uses length supplied as the 'length' parameter, which is always
256. Split the size parameter into key_len and val_len, and use the
appropriate length depending on what is being copied.

Detected by compiler error, only compile-tested.

Cc: "Igor M. Liplianin" <liplianin@netup.ru>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Link: https://lore.kernel.org/r/20200120074344.504-2-dja@axtens.net
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/202002251042.D898E67AC@keescook
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

63cb7373

drm/exynos: dsi: fix workaround for the legacy clock name · c5cd6fe4

Marek Szyprowski authored Feb 20, 2020

[ Upstream commit c0fd99d6

 ]

Writing to the built-in strings arrays doesn't work if driver is loaded
as kernel module. This is also considered as a bad pattern. Fix this by
adding a call to clk_get() with legacy clock name. This fixes following
kernel oops if driver is loaded as module:

Unable to handle kernel paging request at virtual address bf047978
 pgd = (ptrval)
 [bf047978] *pgd=59344811, *pte=5903c6df, *ppte=5903c65f
 Internal error: Oops: 80f [#1] SMP ARM
 Modules linked in: mc exynosdrm(+) analogix_dp rtc_s3c exynos_ppmu i2c_gpio
 CPU: 1 PID: 212 Comm: systemd-udevd Not tainted 5.6.0-rc2-next-20200219 #326
 videodev: Linux video capture interface: v2.00
 Hardware name: Samsung Exynos (Flattened Device Tree)
 PC is at exynos_dsi_probe+0x1f0/0x384 [exynosdrm]
 LR is at exynos_dsi_probe+0x1dc/0x384 [exynosdrm]
 ...
 Process systemd-udevd (pid: 212, stack limit = 0x(ptrval))
 ...
 [<bf03cf14>] (exynos_dsi_probe [exynosdrm]) from [<c09b1ca0>] (platform_drv_probe+0x6c/0xa4)
 [<c09b1ca0>] (platform_drv_probe) from [<c09afcb8>] (really_probe+0x210/0x350)
 [<c09afcb8>] (really_probe) from [<c09aff74>] (driver_probe_device+0x60/0x1a0)
 [<c09aff74>] (driver_probe_device) from [<c09b0254>] (device_driver_attach+0x58/0x60)
 [<c09b0254>] (device_driver_attach) from [<c09b02dc>] (__driver_attach+0x80/0xbc)
 [<c09b02dc>] (__driver_attach) from [<c09ade00>] (bus_for_each_dev+0x68/0xb4)
 [<c09ade00>] (bus_for_each_dev) from [<c09aefd8>] (bus_add_driver+0x130/0x1e8)
 [<c09aefd8>] (bus_add_driver) from [<c09b0d64>] (driver_register+0x78/0x110)
 [<c09b0d64>] (driver_register) from [<bf038558>] (exynos_drm_init+0xe8/0x11c [exynosdrm])
 [<bf038558>] (exynos_drm_init [exynosdrm]) from [<c0302fa8>] (do_one_initcall+0x50/0x220)
 [<c0302fa8>] (do_one_initcall) from [<c03dd02c>] (do_init_module+0x60/0x210)
 [<c03dd02c>] (do_init_module) from [<c03dbf44>] (load_module+0x1c0c/0x2310)
 [<c03dbf44>] (load_module) from [<c03dc85c>] (sys_finit_module+0xac/0xbc)
 [<c03dc85c>] (sys_finit_module) from [<c0301000>] (ret_fast_syscall+0x0/0x54)
 Exception stack(0xd979bfa8 to 0xd979bff0)
 ...
 ---[ end trace db16efe05faab470 ]---

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

c5cd6fe4

drm/exynos: dsi: propagate error value and silence meaningless warning · e4651618

Marek Szyprowski authored Feb 27, 2020

[ Upstream commit 0a9d1e3f

 ]

Properly propagate error value from devm_regulator_bulk_get() and don't
confuse user with meaningless warning about failure in getting regulators
in case of deferred probe.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

e4651618

spi/zynqmp: remove entry that causes a cs glitch · b733af0d

Thommy Jakobsson authored Feb 24, 2020

[ Upstream commit 5dd83049

 ]

In the public interface for chipselect, there is always an entry
commented as "Dummy generic FIFO entry" pushed down to the fifo right
after the activate/deactivate command. The dummy entry is 0x0,
irregardless if the intention was to activate or deactive the cs. This
causes the cs line to glitch rather than beeing activated in the case
when there was an activate command.

This has been observed on oscilloscope, and have caused problems for at
least one specific flash device type connected to the qspi port. After
the change the glitch is gone and cs goes active when intended.

The reason why this worked before (except for the glitch) was because
when sending the actual data, the CS bits are once again set. Since
most flashes uses mode 0, there is always a half clk period anyway for
cs to clk active setup time. If someone would rely on timing from a
chip_select call to a transfer_one, it would fail though.

It is unknown why the dummy entry was there in the first place, git log
seems to be of no help in this case. The reference manual gives no
indication of the necessity of this. In fact the lower 8 bits are a
setup (or hold in case of deactivate) time expressed in cycles. So this
should not be needed to fulfill any setup/hold timings.

Signed-off-by: Thommy Jakobsson <thommyj@gmail.com>
Reviewed-by: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
Link: https://lore.kernel.org/r/20200224162643.29102-1-thommyj@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

b733af0d

ARM: dts: dra7: Add "dma-ranges" property to PCIe RC DT nodes · 2414e188

Kishon Vijay Abraham I authored Jan 28, 2020

[ Upstream commit 27f13774

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'dma-ranges' in a PCI bridge node does correctly set dma masks for PCI
devices not described in the DT. Certain DRA7 platforms (e.g., DRA76)
has RAM above 32-bit boundary (accessible with LPAE config) though the
PCIe bridge will be able to access only 32-bits. Add 'dma-ranges'
property in PCIe RC DT nodes to indicate the host bridge can access
only 32 bits.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2414e188

powerpc: Include .BTF section · 7061c4c0

Naveen N Rao authored Feb 20, 2020

[ Upstream commit cb0cc635

 ]

Selecting CONFIG_DEBUG_INFO_BTF results in the below warning from ld:
  ld: warning: orphan section `.BTF' from `.btf.vmlinux.bin.o' being placed in section `.BTF'

Include .BTF section in vmlinux explicitly to fix the same.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200220113132.857132-1-naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

7061c4c0