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Gaurav Batra 5539216f73 powerpc/pseries/iommu: Fix kmemleak in TCE table userspace view 
[ Upstream commit d36e3f11fe ]

When a device is opened by a userspace driver, via VFIO interface, DMA
window is created. This DMA window has TCE Table and a corresponding
data for userview of TCE table.

When the userspace driver closes the device, all the above infrastructure
is free'ed and the device control given back to kernel. Both DMA window
and TCE table is getting free'ed. But due to a code bug, userview of the
TCE table is not getting free'ed. This is resulting in a memory leak.

Befow is the information from KMEMLEAK

unreferenced object 0xc008000022af0000 (size 16777216):
  comm "senlib_unit_tes", pid 9346, jiffies 4294983174
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 0):
    kmemleak_vmalloc+0xc8/0x1a0
    __vmalloc_node_range+0x284/0x340
    vzalloc+0x58/0x70
    spapr_tce_create_table+0x4b0/0x8d0
    tce_iommu_create_table+0xcc/0x170 [vfio_iommu_spapr_tce]
    tce_iommu_create_window+0x144/0x2f0 [vfio_iommu_spapr_tce]
    tce_iommu_ioctl.part.0+0x59c/0xc90 [vfio_iommu_spapr_tce]
    vfio_fops_unl_ioctl+0x88/0x280 [vfio]
    sys_ioctl+0xf4/0x160
    system_call_exception+0x164/0x310
    system_call_vectored_common+0xe8/0x278
unreferenced object 0xc008000023b00000 (size 4194304):
  comm "senlib_unit_tes", pid 9351, jiffies 4294984116
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 0):
    kmemleak_vmalloc+0xc8/0x1a0
    __vmalloc_node_range+0x284/0x340
    vzalloc+0x58/0x70
    spapr_tce_create_table+0x4b0/0x8d0
    tce_iommu_create_table+0xcc/0x170 [vfio_iommu_spapr_tce]
    tce_iommu_create_window+0x144/0x2f0 [vfio_iommu_spapr_tce]
    tce_iommu_create_default_window+0x88/0x120 [vfio_iommu_spapr_tce]
    tce_iommu_ioctl.part.0+0x57c/0xc90 [vfio_iommu_spapr_tce]
    vfio_fops_unl_ioctl+0x88/0x280 [vfio]
    sys_ioctl+0xf4/0x160
    system_call_exception+0x164/0x310
    system_call_vectored_common+0xe8/0x278

Fixes: f431a8cde7 ("powerpc/iommu: Reimplement the iommu_table_group_ops for pSeries")
Signed-off-by: Gaurav Batra <gbatra@linux.ibm.com>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250512224653.35697-1-gbatra@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-06-19 15:31:29 +02:00
arch powerpc/pseries/iommu: Fix kmemleak in TCE table userspace view 2025-06-19 15:31:29 +02:00
block block: fix adding folio to bio 2025-06-10 07:12:59 -04:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: algif_hash - fix double free in hash_accept 2025-05-29 11:03:18 +02:00
Documentation dt-bindings: phy: imx8mq-usb: fix fsl,phy-tx-vboost-level-microvolt property 2025-06-10 07:13:00 -04:00
drivers crypto: marvell/cesa - Avoid empty transfer descriptor 2025-06-19 15:31:29 +02:00
fs erofs: avoid using multiple devices with different type 2025-06-19 15:31:29 +02:00
include NFS: Avoid flushing data while holding directory locks in nfs_rename() 2025-06-04 14:43:53 +02:00
init rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
io_uring io_uring: fix overflow resched cqe reordering 2025-05-29 11:03:17 +02:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel sched/core: Tweak wait_task_inactive() to force dequeue sched_delayed tasks 2025-06-19 15:31:27 +02:00
lib crypto: lzo - Fix compression buffer overrun 2025-05-29 11:02:25 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm: vmalloc: only zero-init on vrealloc shrink 2025-05-29 11:03:23 +02:00
net net_sched: hfsc: Address reentrant enqueue adding class to eltree twice 2025-06-04 14:43:51 +02:00
rust rust: clean Rust 1.88.0's clippy::uninlined_format_args lint 2025-05-18 08:24:57 +02:00
samples samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora 2025-05-29 11:02:01 +02:00
scripts kbuild: Properly disable -Wunterminated-string-initialization for clang 2025-05-29 11:03:25 +02:00
security smack: Revert "smackfs: Added check catlen" 2025-05-29 11:02:48 +02:00
sound ALSA: hda/realtek - restore auto-mute mode for Dell Chrome platform 2025-06-04 14:43:53 +02:00
tools kselftest: cpufreq: Get rid of double suspend in rtcwake case 2025-06-19 15:31:28 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Add member to struct kvm_gfn_range to indicate private/shared 2025-05-22 14:29:36 +02:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-18 08:24:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.33 2025-06-10 07:13:00 -04:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.