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Shivaprasad G Bhat b853ff0b51 powerpc/pseries/iommu: Don't unset window if it was never set 
commit 17391cb261 upstream.

On pSeries, when user attempts to use the same vfio container used by
different iommu group, the spapr_tce_set_window() returns -EPERM
and the subsequent cleanup leads to the below crash.

   Kernel attempted to read user page (308) - exploit attempt?
   BUG: Kernel NULL pointer dereference on read at 0x00000308
   Faulting instruction address: 0xc0000000001ce358
   Oops: Kernel access of bad area, sig: 11 [#1]
   NIP:  c0000000001ce358 LR: c0000000001ce05c CTR: c00000000005add0
   <snip>
   NIP [c0000000001ce358] spapr_tce_unset_window+0x3b8/0x510
   LR [c0000000001ce05c] spapr_tce_unset_window+0xbc/0x510
   Call Trace:
     spapr_tce_unset_window+0xbc/0x510 (unreliable)
     tce_iommu_attach_group+0x24c/0x340 [vfio_iommu_spapr_tce]
     vfio_container_attach_group+0xec/0x240 [vfio]
     vfio_group_fops_unl_ioctl+0x548/0xb00 [vfio]
     sys_ioctl+0x754/0x1580
     system_call_exception+0x13c/0x330
     system_call_vectored_common+0x15c/0x2ec
   <snip>
   --- interrupt: 3000

Fix this by having null check for the tbl passed to the
spapr_tce_unset_window().

Fixes: f431a8cde7 ("powerpc/iommu: Reimplement the iommu_table_group_ops for pSeries")
Cc: stable@vger.kernel.org
Reported-by: Vaishnavi Bhat <vaish123@in.ibm.com>
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/173674009556.1559.12487885286848752833.stgit@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-02-08 09:58:17 +01:00
arch powerpc/pseries/iommu: Don't unset window if it was never set 2025-02-08 09:58:17 +01:00
block partitions: ldm: remove the initial kernel-doc notation 2025-02-08 09:56:52 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: api - Fix boot-up self-test race 2025-02-08 09:57:28 +01:00
Documentation crypto: iaa - Fix IAA disabling that occurs when sync_mode is set to 'async' 2025-02-08 09:57:30 +01:00
drivers media: imx-jpeg: Fix potential error pointer dereference in detach_pm() 2025-02-08 09:58:17 +01:00
fs xfs: don't shut down the filesystem for media failures beyond end of log 2025-02-08 09:58:13 +01:00
include pps: Fix a use-after-free 2025-02-08 09:58:16 +01:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-05 14:02:45 +01:00
io_uring io_uring/uring_cmd: use cached cmd_op in io_uring_cmd_sock() 2025-02-08 09:58:10 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel PM: hibernate: Add error handling for syscore_suspend() 2025-02-08 09:58:03 +01:00
lib rhashtable: Fix rhashtable_try_insert test 2025-02-08 09:57:35 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm cachestat: fix page cache statistics permission checking 2025-02-01 18:39:38 +01:00
net mptcp: blackhole only if 1st SYN retrans w/o MPC is accepted 2025-02-08 09:58:16 +01:00
rust rust: kbuild: set bindgen's Rust target version 2024-12-19 18:13:22 +01:00
samples samples/landlock: Fix possible NULL dereference in parse_path() 2025-02-08 09:57:11 +01:00
scripts kbuild: switch from lz4c to lz4 for compression 2025-02-08 09:58:12 +01:00
security landlock: Handle weird files 2025-02-08 09:57:16 +01:00
sound ALSA: usb-audio: Add delay quirk for iBasso DC07 Pro 2025-02-08 09:58:13 +01:00
tools ktest.pl: Check kernelrelease return in get_version 2025-02-08 09:58:13 +01:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM: x86: switch hugepage recovery thread to vhost_task 2024-12-05 14:02:43 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +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 Kbuild updates for v6.12 2024-09-24 13:02:06 -07:00
.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 location of media main tree 2024-12-05 14:02:42 +01:00
Makefile kbuild: switch from lz4c to lz4 for compression 2025-02-08 09:58:12 +01:00
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.