linux-kernel - Re: [PATCH] powerpc/iommu: Fix the missing iommu_group

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <170800185788.599237.5797864611377163325.b4-ty@ellerman.id.au>
Date: Thu, 15 Feb 2024 23:57:37 +1100
From: Michael Ellerman <patch-notifications@...erman.id.au>
To: iommu@...ts.linux.dev, linuxppc-dev@...ts.ozlabs.org, Shivaprasad G Bhat <sbhat@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, npiggin@...il.com, christophe.leroy@...roup.eu, aneesh.kumar@...nel.org, naveen.n.rao@...ux.ibm.com, jgg@...pe.ca, jroedel@...e.de, tpearson@...torengineering.com, aik@....com, bgray@...ux.ibm.com, gregkh@...uxfoundation.org, gbatra@...ux.vnet.ibm.com, vaibhav@...ux.ibm.com, venkat88@...ux.vnet.ibm.com
Subject: Re: [PATCH] powerpc/iommu: Fix the missing iommu_group_put() during platform domain attach

On Tue, 13 Feb 2024 10:05:22 -0600, Shivaprasad G Bhat wrote:
> The function spapr_tce_platform_iommu_attach_dev() is missing to call
> iommu_group_put() when the domain is already set. This refcount leak
> shows up with BUG_ON() during DLPAR remove operation as,
> 
>   KernelBug: Kernel bug in state 'None': kernel BUG at arch/powerpc/platforms/pseries/iommu.c:100!
>   Oops: Exception in kernel mode, sig: 5 [#1]
>   LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=8192 NUMA pSeries
>   <snip>
>   Hardware name: IBM,9080-HEX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_016) hv:phyp pSeries
>   NIP:  c0000000000ff4d4 LR: c0000000000ff4cc CTR: 0000000000000000
>   REGS: c0000013aed5f840 TRAP: 0700   Tainted: G          I         (6.8.0-rc3-autotest-g99bd3cb0d12e)
>   MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 44002402  XER: 20040000
>   CFAR: c000000000a0d170 IRQMASK: 0
>   GPR00: c0000000000ff4cc c0000013aed5fae0 c000000001512700 c0000013aa362138
>   GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000119c8afd0
>   GPR08: 0000000000000000 c000001284442b00 0000000000000001 0000000000001003
>   GPR12: 0000000300000000 c0000018ffff2f00 0000000000000000 0000000000000000
>   GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>   GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>   GPR24: c0000013aed5fc40 0000000000000002 0000000000000000 c000000002757d90
>   GPR28: c0000000000ff440 c000000002757cb8 c00000183799c1a0 c0000013aa362b00
>   NIP [c0000000000ff4d4] iommu_reconfig_notifier+0x94/0x200
>   LR [c0000000000ff4cc] iommu_reconfig_notifier+0x8c/0x200
>   Call Trace:
>   [c0000013aed5fae0] [c0000000000ff4cc] iommu_reconfig_notifier+0x8c/0x200 (unreliable)
>   [c0000013aed5fb10] [c0000000001a27b0] notifier_call_chain+0xb8/0x19c
>   [c0000013aed5fb70] [c0000000001a2a78] blocking_notifier_call_chain+0x64/0x98
>   [c0000013aed5fbb0] [c000000000c4a898] of_reconfig_notify+0x44/0xdc
>   [c0000013aed5fc20] [c000000000c4add4] of_detach_node+0x78/0xb0
>   [c0000013aed5fc70] [c0000000000f96a8] ofdt_write.part.0+0x86c/0xbb8
>   [c0000013aed5fce0] [c00000000069b4bc] proc_reg_write+0xf4/0x150
>   [c0000013aed5fd10] [c0000000005bfeb4] vfs_write+0xf8/0x488
>   [c0000013aed5fdc0] [c0000000005c0570] ksys_write+0x84/0x140
>   [c0000013aed5fe10] [c000000000033358] system_call_exception+0x138/0x330
>   [c0000013aed5fe50] [c00000000000d05c] system_call_vectored_common+0x15c/0x2ec
>   --- interrupt: 3000 at 0x20000433acb4
>   <snip>
>   ---[ end trace 0000000000000000 ]---
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/iommu: Fix the missing iommu_group_put() during platform domain attach
      https://git.kernel.org/powerpc/c/0846dd77c8349ec92ca0079c9c71d130f34cb192

cheers