On 3/2/21 8:49 PM, Jens Axboe wrote:
> On 3/2/21 11:34 AM, Coelho, Luciano wrote:
>> On Tue, 2021-03-02 at 11:20 -0700, Jens Axboe wrote:
>>> My laptop crashes at boot, and I ran the same kernel with KASAN enabled.
>>> Turns out the DMI addition for iwlwifi is broken (and untested?), since
>>> it doesn't properly terminate the scan table. Ensure that we do so.
>>>
>>> ==================================================================
>>> BUG: KASAN: global-out-of-bounds in dmi_check_system+0x5a/0x70
>>> Read of size 1 at addr ffffffffc16af750 by task NetworkManager/1913
>>>
>>> CPU: 4 PID: 1913 Comm: NetworkManager Not tainted 5.12.0-rc1+ #10057
>>> Hardware name: LENOVO 20THCTO1WW/20THCTO1WW, BIOS N2VET27W (1.12 ) 12/21/2020
>>> Call Trace:
>>> dump_stack+0x90/0xbe
>>> print_address_description.constprop.0+0x1d/0x140
>>> ? dmi_check_system+0x5a/0x70
>>> ? dmi_check_system+0x5a/0x70
>>> kasan_report.cold+0x7b/0xd4
>>> ? dmi_check_system+0x5a/0x70
>>> __asan_load1+0x4d/0x50
>>> dmi_check_system+0x5a/0x70
>>> iwl_mvm_up+0x1360/0x1690 [iwlmvm]
>>> ? iwl_mvm_send_recovery_cmd+0x270/0x270 [iwlmvm]
>>> ? setup_object.isra.0+0x27/0xd0
>>> ? kasan_poison+0x20/0x50
>>> ? ___slab_alloc.constprop.0+0x483/0x5b0
>>> ? mempool_kmalloc+0x17/0x20
>>> ? ftrace_graph_ret_addr+0x2a/0xb0
>>> ? kasan_poison+0x3c/0x50
>>> ? cfg80211_iftype_allowed+0x2e/0x90 [cfg80211]
>>> ? __kasan_check_write+0x14/0x20
>>> ? mutex_lock+0x86/0xe0
>>> ? __mutex_lock_slowpath+0x20/0x20
>>> __iwl_mvm_mac_start+0x49/0x290 [iwlmvm]
>>> iwl_mvm_mac_start+0x37/0x50 [iwlmvm]
>>> drv_start+0x73/0x1b0 [mac80211]
>>> ieee80211_do_open+0x53e/0xf10 [mac80211]
>>> ? ieee80211_check_concurrent_iface+0x266/0x2e0 [mac80211]
>>> ieee80211_open+0xb9/0x100 [mac80211]
>>> __dev_open+0x1b8/0x280
>>> ? dev_set_rx_mode+0x40/0x40
>>> __dev_change_flags+0x32f/0x3a0
>>> ? dev_set_allmulti+0x20/0x20
>>> ? is_bpf_text_address+0x24/0x30
>>> ? kernel_text_address+0xbb/0xd0
>>> dev_change_flags+0x63/0xc0
>>> do_setlink+0xb59/0x18c0
>>> ? rtnetlink_put_metrics+0x2e0/0x2e0
>>> ? stack_trace_consume_entry+0x90/0x90
>>> ? if6_seq_show+0xb0/0xb0
>>> ? kasan_save_stack+0x42/0x50
>>> ? kasan_save_stack+0x23/0x50
>>> ? kasan_set_track+0x20/0x30
>>> ? kasan_set_free_info+0x24/0x40
>>> ? __kasan_slab_free+0xea/0x120
>>> ? kfree+0x94/0x250
>>> ? memset+0x3c/0x50
>>> ? __nla_validate_parse+0xc1/0x12d0
>>> ? ____sys_sendmsg+0x430/0x450
>>> ? ___sys_sendmsg+0xf2/0x160
>>> ? __sys_sendmsg+0xc8/0x150
>>> ? __x64_sys_sendmsg+0x48/0x50
>>> ? do_syscall_64+0x32/0x80
>>> ? entry_SYSCALL_64_after_hwframe+0x44/0xae
>>> ? nla_get_range_signed+0x1c0/0x1c0
>>> ? nla_put_ifalias+0x86/0xf0
>>> ? __cgroup_bpf_run_filter_skb+0xc1/0x6f0
>>> ? memcpy+0x4e/0x60
>>> ? __kasan_check_read+0x11/0x20
>>> __rtnl_newlink+0x905/0xde0
>>> ? ipv6_dev_get_saddr+0x4c0/0x4c0
>>> ? rtnl_setlink+0x250/0x250
>>> ? ftrace_graph_ret_addr+0x2a/0xb0
>>> ? entry_SYSCALL_64_after_hwframe+0x44/0xae
>>> ? bpf_ksym_find+0x94/0xe0
>>> ? __rcu_read_unlock+0x39/0x60
>>> ? is_bpf_text_address+0x24/0x30
>>> ? kernel_text_address+0xbb/0xd0
>>> ? __kernel_text_address+0x12/0x40
>>> ? unwind_get_return_address+0x36/0x50
>>> ? create_prof_cpu_mask+0x30/0x30
>>> ? arch_stack_walk+0x98/0xf0
>>> ? stack_trace_save+0x94/0xc0
>>> ? stack_trace_consume_entry+0x90/0x90
>>> ? arch_stack_walk+0x98/0xf0
>>> ? __kasan_kmalloc+0x81/0xa0
>>> ? kmem_cache_alloc_trace+0xf4/0x220
>>> rtnl_newlink+0x55/0x80
>>> rtnetlink_rcv_msg+0x22f/0x560
>>> ? __kasan_slab_alloc+0x5f/0x80
>>> ? rtnl_calcit.isra.0+0x1e0/0x1e0
>>> ? __x64_sys_sendmsg+0x48/0x50
>>> ? do_syscall_64+0x32/0x80
>>> ? entry_SYSCALL_64_after_hwframe+0x44/0xae
>>> ? kernel_text_address+0xbb/0xd0
>>> ? __kernel_text_address+0x12/0x40
>>> ? unwind_get_return_address+0x36/0x50
>>> netlink_rcv_skb+0xe7/0x210
>>> ? rtnl_calcit.isra.0+0x1e0/0x1e0
>>> ? netlink_ack+0x580/0x580
>>> ? netlink_deliver_tap+0x68/0x3d0
>>> rtnetlink_rcv+0x15/0x20
>>> netlink_unicast+0x3a8/0x4f0
>>> ? netlink_attachskb+0x430/0x430
>>> ? __alloc_skb+0xd7/0x1e0
>>> netlink_sendmsg+0x3ff/0x710
>>> ? __rcu_read_unlock+0x39/0x60
>>> ? netlink_unicast+0x4f0/0x4f0
>>> ? iovec_from_user+0x6c/0x170
>>> ? __import_iovec+0x137/0x1c0
>>> ? netlink_unicast+0x4f0/0x4f0
>>> sock_sendmsg+0x74/0x80
>>> ____sys_sendmsg+0x430/0x450
>>> ? kernel_sendmsg+0x40/0x40
>>> ? do_recvmmsg+0x440/0x440
>>> ? kasan_save_stack+0x42/0x50
>>> ? kasan_save_stack+0x23/0x50
>>> ? kasan_record_aux_stack+0xac/0xc0
>>> ? call_rcu+0x5a/0x450
>>> ? __fput+0x1d7/0x3d0
>>> ? ____fput+0xe/0x10
>>> ___sys_sendmsg+0xf2/0x160
>>> ? sendmsg_copy_msghdr+0x120/0x120
>>> ? __kasan_check_write+0x14/0x20
>>> ? _raw_spin_lock+0x82/0xd0
>>> ? _raw_read_lock_irq+0x50/0x50
>>> ? __fget_files+0xce/0x110
>>> ? __fget_light+0x72/0x100
>>> ? __fdget+0x13/0x20
>>> __sys_sendmsg+0xc8/0x150
>>> ? __sys_sendmsg_sock+0x20/0x20
>>> ? __kasan_check_read+0x11/0x20
>>> ? fpregs_assert_state_consistent+0x5a/0x70
>>> __x64_sys_sendmsg+0x48/0x50
>>> do_syscall_64+0x32/0x80
>>> entry_SYSCALL_64_after_hwframe+0x44/0xae
>>> RIP: 0033:0x7f752cc7312d
>>> Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 ca ee ff ff 8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 2f 44 89 c7 48 89 44 24 08 e8 fe ee ff ff 48
>>> RSP: 002b:00007ffd1962bc70 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
>>> RAX: ffffffffffffffda RBX: 000055e6574ba880 RCX: 00007f752cc7312d
>>> RDX: 0000000000000000 RSI: 00007ffd1962bcc0 RDI: 000000000000000c
>>> RBP: 00007ffd1962bcc0 R08: 0000000000000000 R09: 0000000000000000
>>> R10: 0000000000000001 R11: 0000000000000293 R12: 000055e6574ba880
>>> R13: 00007ffd1962be78 R14: 00007ffd1962be6c R15: 0000000000000000
>>>
>>> The buggy address belongs to the variable:
>>> dmi_ppag_approved_list+0x570/0xffffffffffffde20 [iwlmvm]
>>>
>>> Memory state around the buggy address:
>>> ffffffffc16af600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> ffffffffc16af680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>>> ffffffffc16af700: 00 00 00 00 00 00 00 00 f9 f9 f9 f9 00 00 00 01
>>> ^
>>> ffffffffc16af780: f9 f9 f9 f9 00 00 00 00 00 00 02 f9 f9 f9 f9 f9
>>> ffffffffc16af800: 00 00 00 07 f9 f9 f9 f9 00 00 00 00 00 00 00 01
>>> ==================================================================
>>>
>>> Fixes: a2ac0f48a07c ("iwlwifi: mvm: implement approved list for the PPAG feature")
>>> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
>>>
>>> ---
>>>
>>> diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
>>> index 15e2773ce7e7..71e5306bd695 100644
>>> --- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
>>> +++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
>>> @@ -1083,6 +1083,7 @@ static const struct dmi_system_id dmi_ppag_approved_list[] = {
>>> DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek COMPUTER INC."),
>>> },
>>> },
>>> + { },
>>> };
>>>
>>>
>>> static int iwl_mvm_ppag_init(struct iwl_mvm *mvm)
>>>
>>
>> Hi Jens,
>>
>> Thanks for the report and patch! And I'm sorry that we broke your
>> laptop's boot...
>>
>> We already have a patch to fix this:
>>
>> https://patchwork.kernel.org/project/linux-wireless/patch/20210223140039.1708534-1-weiyongjun1@xxxxxxxxxx/
>>
>> I thought I had already acked it for Kalle to take it directly to
>> wireless-drivers, but apparently I hadn't.
>>
>> I acked now and assigned it to him.
>
> All good thanks, as long as it gets fixed and goes upstream I don't care
> where it's from :-)
I looked at the link, and feel free to steal my commit trace/message it
you want.
--
Jens Axboe
