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Message-ID: <87h7i6u70m.wl-maz@kernel.org>
Date: Wed, 09 Jun 2021 21:18:01 +0100
From: Marc Zyngier <maz@...nel.org>
To: John Garry <john.garry@...wei.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [report] use-after-free in __irq_resolve_mapping()
Hi John,
On Wed, 09 Jun 2021 12:59:26 +0100,
John Garry <john.garry@...wei.com> wrote:
>
> JFYI, on -next 20210608, I find this on my arm64 D06 and D05:
>
> root@(none)$ echo 0000:74:02.0 > /sys/bus/pci/drivers/hisi_sas_v3_hw/unbind
> [ 33.623607] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> [ 33.667127] sd 0:0:1:0: [sdb] Synchronizing SCSI cache
> [ 33.703457] sd 0:0:2:0: [sdc] Synchronizing SCSI cache
> [ 33.708770] sd 0:0:2:0: [sdc] Stopping disk
> [ 36.399020] sd 0:0:3:0: [sdd] Synchronizing SCSI cache
> [ 36.450432] sas: ex 500e004aaaaaaa1f phys DID NOT change
> [ 36.457808] sas: ex 500e004aaaaaaa1f phys DID NOT change
> [ 36.465169] sas: ex 500e004aaaaaaa1f phys DID NOT change
> [ 36.472545] sas: ex 500e004aaaaaaa1f phys DID NOT change
> [ 36.480007] sas: ex 500e004aaaaaaa1f phys DID NOT change
> [ 36.487355] sas: ex 500e004aaaaaaa1f phys DID NOT change
> [ 36.494676] sas: ex 500e004aaaaaaa1f phys DID NOT change
> [ 36.512742] hisi_sas_v3_hw 0000:74:02.0: dev[6:1] is gone
> [ 36.605821] hisi_sas_v3_hw 0000:74:02.0: dev[5:1] is gone
> [ 36.697987] hisi_sas_v3_hw 0000:74:02.0: dev[4:5] is gone
> [ 36.803796] hisi_sas_v3_hw 0000:74:02.0: dev[3:1] is gone
> [ 36.880908] hisi_sas_v3_hw 0000:74:02.0: dev[2:1] is gone
> [ 36.898881] hisi_sas_v3_hw 0000:74:02.0: dev[1:2] is gone
> root@(none)$ echo 0000:74:02.0 > /sys/bus/pci/drivers/hisi_sas_v3_hw/bind
> [ 41.189833]
> ==================================================================
> [ 41.197058] BUG: KASAN: use-after-free in
> __irq_resolve_mapping+0x58/0xd8
> [ 41.203846] Read of size 8 at addr ffff002097048470 by task
> kworker/0:1/25
> [ 41.210713]
> [ 41.212195] CPU: 0 PID: 25 Comm: kworker/0:1 Not tainted
> 5.13.0-rc5-next-20210608 #80
> [ 41.220019] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI
> RC0 - V1.16.01 03/15/2019
> [ 41.228535] Workqueue: events work_for_cpu_fn
> [ 41.232893] Call trace:
> [ 41.235330] dump_backtrace+0x0/0x2d0
> [ 41.238989] show_stack+0x18/0x28
> [ 41.242299] dump_stack_lvl+0xfc/0x138
> [ 41.246042] print_address_description.constprop.13+0x78/0x314
> [ 41.251870] kasan_report+0x1e0/0x248
> [ 41.255527] __asan_load8+0x9c/0xd8
> [ 41.259010] __irq_resolve_mapping+0x58/0xd8
> [ 41.263274] msi_domain_alloc+0xd8/0x218
> [ 41.267191] __irq_domain_alloc_irqs+0x188/0x458
> [ 41.271801] __msi_domain_alloc_irqs+0x164/0x5b8
> [ 41.276413] msi_domain_alloc_irqs+0x54/0x68
> [ 41.280677] pci_msi_setup_msi_irqs.isra.18+0x4c/0x70
> [ 41.285725] __pci_enable_msi_range+0x30c/0x4e0
> [ 41.290250] pci_alloc_irq_vectors_affinity+0x144/0x1a8
> [ 41.295470] hisi_sas_v3_probe+0x564/0x11c0
> [ 41.299648] local_pci_probe+0x78/0xf8
> [ 41.303392] work_for_cpu_fn+0x30/0x50
> [ 41.307136] process_one_work+0x424/0x698
> [ 41.311139] worker_thread+0x438/0x6d0
> [ 41.314881] kthread+0x204/0x218
> [ 41.318104] ret_from_fork+0x10/0x18
> [ 41.321673]
> [ 41.323155] Allocated by task 593:
> [ 41.326548] kasan_save_stack+0x28/0x58
> [ 41.330378] __kasan_kmalloc+0x8c/0xb0
> [ 41.334121] alloc_desc+0x68/0x2f0
> [ 41.337516] __irq_alloc_descs+0x1a4/0x2d0
> [ 41.341607] irq_domain_alloc_descs+0x64/0xd8
> [ 41.345957] __irq_domain_alloc_irqs+0x1fc/0x458
> [ 41.350567] __msi_domain_alloc_irqs+0x164/0x5b8
> [ 41.355178] msi_domain_alloc_irqs+0x54/0x68
> [ 41.359442] pci_msi_setup_msi_irqs.isra.18+0x4c/0x70
> [ 41.364488] __pci_enable_msi_range+0x30c/0x4e0
> [ 41.369012] pci_alloc_irq_vectors_affinity+0x144/0x1a8
> [ 41.374232] hisi_sas_v3_probe+0x564/0x11c0
> [ 41.378409] local_pci_probe+0x78/0xf8
> [ 41.382152] work_for_cpu_fn+0x30/0x50
> [ 41.385894] process_one_work+0x424/0x698
> [ 41.389896] worker_thread+0x438/0x6d0
> [ 41.393638] kthread+0x204/0x218
> [ 41.396859] ret_from_fork+0x10/0x18
> [ 41.400427]
> [ 41.401908] Freed by task 0:
> [ 41.404780] kasan_save_stack+0x28/0x58
> [ 41.408609] kasan_set_track+0x28/0x40
> [ 41.412352] kasan_set_free_info+0x28/0x50
> [ 41.416442] __kasan_slab_free+0xd8/0x138
> [ 41.420446] kfree+0xb4/0x478
> [ 41.423406] irq_kobj_release+0x30/0x40
> [ 41.427235] kobject_put+0xa8/0x180
> [ 41.430716] delayed_free_desc+0x14/0x20
> [ 41.434632] rcu_core+0x4a8/0x840
> [ 41.437939] rcu_core_si+0x10/0x20
> [ 41.441333] __do_softirq+0x1ac/0x3d0
> [ 41.444987]
> [ 41.446468] Last potentially related work creation:
> [ 41.451336] kasan_save_stack+0x28/0x58
> [ 41.455166] kasan_record_aux_stack+0xc0/0xd8
> [ 41.459517] call_rcu+0x64/0x2e8
> [ 41.462736] free_desc+0x6c/0x80
> [ 41.465957] irq_free_descs+0x74/0xb8
> [ 41.469612] irq_domain_free_irqs+0x170/0x1d8
> [ 41.473962] __msi_domain_free_irqs+0x70/0xa8
> [ 41.478312] msi_domain_free_irqs+0x4c/0x60
> [ 41.482488] free_msi_irqs+0x2a8/0x2b0
> [ 41.486231] pci_disable_msi+0x104/0x138
> [ 41.490147] pci_free_irq_vectors+0x20/0x30
> [ 41.494324] hisi_sas_v3_remove+0x194/0x1f0
> [ 41.498501] pci_device_remove+0x6c/0x138
> [ 41.502502] device_release_driver_internal+0x158/0x280
> [ 41.507722] device_driver_detach+0x2c/0x40
> [ 41.511899] unbind_store+0xc8/0x160
> [ 41.515466] drv_attr_store+0x4c/0x68
> [ 41.519123] sysfs_kf_write+0x90/0xa8
> [ 41.522781] kernfs_fop_write_iter+0x198/0x260
> [ 41.527219] new_sync_write+0x1ec/0x2d8
> [ 41.531050] vfs_write+0x3d4/0x548
> [ 41.534446] ksys_write+0xc8/0x178
> [ 41.537839] __arm64_sys_write+0x44/0x58
> [ 41.541754] invoke_syscall+0x5c/0x178
> [ 41.545497] el0_svc_common+0xc4/0x130
> [ 41.549240] do_el0_svc+0x90/0xa0
> [ 41.552548] el0_svc+0x24/0x38
> [ 41.555596] el0t_64_sync_handler+0x90/0xb8
> [ 41.559773] el0t_64_sync+0x178/0x17c
> [ 41.563428]
> [ 41.564908] The buggy address belongs to the object at ffff002097048400
> [ 41.564908] which belongs to the cache kmalloc-512 of size 512
> [ 41.577418] The buggy address is located 112 bytes inside of
> [ 41.577418] 512-byte region [ffff002097048400, ffff002097048600)
> [ 41.589146] The buggy address belongs to the page:
> [ 41.593928] page:(____ptrval____) refcount:1 mapcount:0
> mapping:0000000000000000 index:0x0 pfn:0x2097048
> [ 41.603400] head:(____ptrval____) order:3 compound_mapcount:0
> compound_pincount:0
> [ 41.610873] flags:
> 0xbfffc0000010200(slab|head|node=0|zone=2|lastcpupid=0xffff)
> [ 41.618180] raw: 0bfffc0000010200 dead000000000100 dead000000000122
> ffff00208000c780
> [ 41.625916] raw: 00000000 41.639211]
> [ 41.640692] Memory state around the buggy address:
> [ 41.645474] ffff002097048300: fc fc fc fc fc fc fc fc fc fc fc fc
> fc fc fc fc
> [ 41.652687] ffff002097048380: fc fc fc fc fc fc fc fc fc fc fc fc
> fc fc fc fc
> [ 41.659900] >ffff002097048400: fa fb fb fb fb fb fb fb fb fb fb fb
> fb fb fb fb
> [ 41.667112] ^
> [ 41.673977] ffff002097048480: fb fb fb fb fb fb fb fb fb fb fb fb
> fb fb fb fb
> [ 41.681190] ffff002097048500: fb fb fb fb fb fb fb fb fb fb fb fb
> fb fb fb fb
> [ 41.688403]
> ==================================================================
> [ 41.695614] Disabling lock debugging due to kernel taint
> [ 41.822545] hisi_sas_v3_hw: probe of 0000:74:02.0 failed with error -2
> sh: echo: write error: No such device
> root@(none)$
>
> I didn't see a report elsewhere.
Just reproduced it. I'll chase it tomorrow...
Thanks for the heads up!
M.
--
Without deviation from the norm, progress is not possible.
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