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6097df457a
linux/drivers/iommu
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Lu Baolu 6097df457a iommu/vt-d: Fix kernel NULL pointer dereference in find_domain() 
If calling find_domain() for a device which hasn't been probed by the
iommu core, below kernel NULL pointer dereference issue happens.

[  362.736947] BUG: kernel NULL pointer dereference, address: 0000000000000038
[  362.743953] #PF: supervisor read access in kernel mode
[  362.749115] #PF: error_code(0x0000) - not-present page
[  362.754278] PGD 0 P4D 0
[  362.756843] Oops: 0000 [#1] SMP NOPTI
[  362.760528] CPU: 0 PID: 844 Comm: cat Not tainted 5.9.0-rc4-intel-next+ #1
[  362.767428] Hardware name: Intel Corporation Ice Lake Client Platform/IceLake
               U DDR4 SODIMM PD RVP TLC, BIOS ICLSFWR1.R00.3384.A02.1909200816
               09/20/2019
[  362.781109] RIP: 0010:find_domain+0xd/0x40
[  362.785234] Code: 48 81 fb 60 28 d9 b2 75 de 5b 41 5c 41 5d 5d c3 0f 1f 00 66
                     2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 87 e0 02 00
                     00 55 <48> 8b 40 38 48 89 e5 48 83 f8 fe 0f 94 c1 48 85 ff
                     0f 94 c2 08 d1
[  362.804041] RSP: 0018:ffffb09cc1f0bd38 EFLAGS: 00010046
[  362.809292] RAX: 0000000000000000 RBX: ffff905b98e4fac8 RCX: 0000000000000000
[  362.816452] RDX: 0000000000000001 RSI: ffff905b98e4fac8 RDI: ffff905b9ccd40d0
[  362.823617] RBP: ffffb09cc1f0bda0 R08: ffffb09cc1f0bd48 R09: 000000000000000f
[  362.830778] R10: ffffffffb266c080 R11: ffff905b9042602d R12: ffff905b98e4fac8
[  362.837944] R13: ffffb09cc1f0bd48 R14: ffff905b9ccd40d0 R15: ffff905b98e4fac8
[  362.845108] FS:  00007f8485460740(0000) GS:ffff905b9fc00000(0000)
               knlGS:0000000000000000
[  362.853227] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  362.858996] CR2: 0000000000000038 CR3: 00000004627a6003 CR4: 0000000000770ef0
[  362.866161] PKRU: fffffffc
[  362.868890] Call Trace:
[  362.871363]  ? show_device_domain_translation+0x32/0x100
[  362.876700]  ? bind_store+0x110/0x110
[  362.880387]  ? klist_next+0x91/0x120
[  362.883987]  ? domain_translation_struct_show+0x50/0x50
[  362.889237]  bus_for_each_dev+0x79/0xc0
[  362.893121]  domain_translation_struct_show+0x36/0x50
[  362.898204]  seq_read+0x135/0x410
[  362.901545]  ? handle_mm_fault+0xeb8/0x1750
[  362.905755]  full_proxy_read+0x5c/0x90
[  362.909526]  vfs_read+0xa6/0x190
[  362.912782]  ksys_read+0x61/0xe0
[  362.916037]  __x64_sys_read+0x1a/0x20
[  362.919725]  do_syscall_64+0x37/0x80
[  362.923329]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  362.928405] RIP: 0033:0x7f84855c5e95

Filter out those devices to avoid such error.

Fixes: e2726daea5 ("iommu/vt-d: debugfs: Add support to show page table internals")
Reported-and-tested-by: Xu Pengfei <pengfei.xu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: stable@vger.kernel.org#v5.6+
Link: https://lore.kernel.org/r/20201028070725.24979-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2020-11-03 14:30:10 +01:00
..
amd iommu/amd: Increase interrupt remapping table limit to 512 entries 2020-11-03 14:21:10 +01:00
arm Merge branches 'arm/allwinner', 'arm/mediatek', 'arm/renesas', 'arm/tegra', 'arm/qcom', 'arm/smmu', 'ppc/pamu', 'x86/amd', 'x86/vt-d' and 'core' into next 2020-10-07 11:51:59 +02:00
intel iommu/vt-d: Fix kernel NULL pointer dereference in find_domain() 2020-11-03 14:30:10 +01:00
dma-iommu.c dma-mapping updates for 5.10 2020-10-15 14:43:29 -07:00
exynos-iommu.c iommu/exynos: add missing put_device() call in exynos_iommu_of_xlate() 2020-09-24 10:48:29 +02:00
fsl_pamu_domain.c iommu/pamu: Use dev_iommu_priv_get/set() 2020-06-30 11:59:48 +02:00
fsl_pamu_domain.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
fsl_pamu.c iommu/pamu: Replace use of kzfree with kfree_sensitive 2020-09-18 10:59:04 +02:00
fsl_pamu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
hyperv-iommu.c x86_ioapic_Consolidate_IOAPIC_allocation 2020-09-16 16:52:32 +02:00
io-pgtable-arm-v7s.c iommu: Add gfp parameter to io_pgtable_ops->map() 2020-07-24 14:29:47 +02:00
io-pgtable-arm.c dma-mapping updates for 5.10 2020-10-15 14:43:29 -07:00
io-pgtable-arm.h iommu/io-pgtable-arm: Move some definitions to a header 2020-09-28 23:48:06 +01:00
io-pgtable.c iommu/io-pgtable-arm: Rationalise TCR handling 2020-01-10 15:52:24 +00:00
ioasid.c iommu/ioasid: Add custom allocators 2019-10-15 13:34:25 +02:00
iommu-debugfs.c iommu: Fix IOMMU debugfs fallout 2019-02-26 11:15:58 +01:00
iommu-sysfs.c drivers/iommu: Export core IOMMU API symbols to permit modular drivers 2019-12-23 14:06:05 +01:00
iommu-traces.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
iommu.c IOMMU Updates for Linux v5.10 2020-10-14 12:08:34 -07:00
iova.c iommu/iova: Replace cmpxchg with xchg in queue_iova 2020-09-04 12:11:06 +02:00
ipmmu-vmsa.c IOMMU Updates for Linux v5.9 2020-08-11 14:13:24 -07:00
irq_remapping.c iommu/irq_remapping: Consolidate irq domain lookup 2020-09-16 16:52:30 +02:00
irq_remapping.h iommu/irq_remapping: Consolidate irq domain lookup 2020-09-16 16:52:30 +02:00
Kconfig Merge branches 'arm/allwinner', 'arm/mediatek', 'arm/renesas', 'arm/tegra', 'arm/qcom', 'arm/smmu', 'ppc/pamu', 'x86/amd', 'x86/vt-d' and 'core' into next 2020-10-07 11:51:59 +02:00
Makefile More Arm SMMU updates for 5.9 2020-07-29 14:47:37 +02:00
msm_iommu_hw-8xxx.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 267 2019-06-05 17:30:29 +02:00
msm_iommu.c iommu: Add gfp parameter to io_pgtable_ops->map() 2020-07-24 14:29:47 +02:00
msm_iommu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 267 2019-06-05 17:30:29 +02:00
mtk_iommu_v1.c iommu/mediatek: Do no use dev->archdata.iommu 2020-06-30 11:59:48 +02:00
mtk_iommu.c iommu/mediatek: Add support for MT8167 2020-09-18 10:29:12 +02:00
mtk_iommu.h iommu/mediatek: Add support for MT8167 2020-09-18 10:29:12 +02:00
of_iommu.c of/device: Add input id to of_dma_configure() 2020-07-28 15:51:32 +01:00
omap-iommu-debug.c iommu/omap: Check for failure of a call to omap_iommu_dump_ctx 2020-07-22 15:02:33 +02:00
omap-iommu.c Merge branches 'arm/renesas', 'arm/qcom', 'arm/mediatek', 'arm/omap', 'arm/exynos', 'arm/smmu', 'ppc/pamu', 'x86/vt-d', 'x86/amd' and 'core' into next 2020-07-29 14:42:00 +02:00
omap-iommu.h iommu/omap: add support for late attachment of iommu devices 2019-08-09 17:37:10 +02:00
omap-iopgtable.h iommu/omap: Fix -Woverflow warnings when compiling on 64-bit architectures 2020-03-04 16:24:46 +01:00
rockchip-iommu.c iommu/rockchip: Use dev_iommu_priv_get/set() 2020-06-30 11:59:48 +02:00
s390-iommu.c s390 updates for the 5.8 merge window 2020-06-08 12:05:31 -07:00
sun50i-iommu.c iommu/sun50i: Fix set-but-not-used variable warning 2020-09-04 13:39:45 +02:00
tegra-gart.c iommu/tegra: Use dev_iommu_priv_get/set() 2020-06-30 11:59:48 +02:00
tegra-smmu.c iommu/tegra-smmu: Allow to group clients in same swgroup 2020-09-24 12:32:32 +02:00
virtio-iommu.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00