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Mastan Katragadda 661412e301 drm/i915/gem: add missing boundary check in vm_access 
A missing bounds check in vm_access() can lead to an out-of-bounds read
or write in the adjacent memory area, since the len attribute is not
validated before the memcpy later in the function, potentially hitting:

[  183.637831] BUG: unable to handle page fault for address: ffffc90000c86000
[  183.637934] #PF: supervisor read access in kernel mode
[  183.637997] #PF: error_code(0x0000) - not-present page
[  183.638059] PGD 100000067 P4D 100000067 PUD 100258067 PMD 106341067 PTE 0
[  183.638144] Oops: 0000 [#2] PREEMPT SMP NOPTI
[  183.638201] CPU: 3 PID: 1790 Comm: poc Tainted: G      D           5.17.0-rc6-ci-drm-11296+ #1
[  183.638298] Hardware name: Intel Corporation CoffeeLake Client Platform/CoffeeLake H DDR4 RVP, BIOS CNLSFWR1.R00.X208.B00.1905301319 05/30/2019
[  183.638430] RIP: 0010:memcpy_erms+0x6/0x10
[  183.640213] RSP: 0018:ffffc90001763d48 EFLAGS: 00010246
[  183.641117] RAX: ffff888109c14000 RBX: ffff888111bece40 RCX: 0000000000000ffc
[  183.642029] RDX: 0000000000001000 RSI: ffffc90000c86000 RDI: ffff888109c14004
[  183.642946] RBP: 0000000000000ffc R08: 800000000000016b R09: 0000000000000000
[  183.643848] R10: ffffc90000c85000 R11: 0000000000000048 R12: 0000000000001000
[  183.644742] R13: ffff888111bed190 R14: ffff888109c14000 R15: 0000000000001000
[  183.645653] FS:  00007fe5ef807540(0000) GS:ffff88845b380000(0000) knlGS:0000000000000000
[  183.646570] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.647481] CR2: ffffc90000c86000 CR3: 000000010ff02006 CR4: 00000000003706e0
[  183.648384] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  183.649271] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  183.650142] Call Trace:
[  183.650988]  <TASK>
[  183.651793]  vm_access+0x1f0/0x2a0 [i915]
[  183.652726]  __access_remote_vm+0x224/0x380
[  183.653561]  mem_rw.isra.0+0xf9/0x190
[  183.654402]  vfs_read+0x9d/0x1b0
[  183.655238]  ksys_read+0x63/0xe0
[  183.656065]  do_syscall_64+0x38/0xc0
[  183.656882]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[  183.657663] RIP: 0033:0x7fe5ef725142
[  183.659351] RSP: 002b:00007ffe1e81c7e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[  183.660227] RAX: ffffffffffffffda RBX: 0000557055dfb780 RCX: 00007fe5ef725142
[  183.661104] RDX: 0000000000001000 RSI: 00007ffe1e81d880 RDI: 0000000000000005
[  183.661972] RBP: 00007ffe1e81e890 R08: 0000000000000030 R09: 0000000000000046
[  183.662832] R10: 0000557055dfc2e0 R11: 0000000000000246 R12: 0000557055dfb1c0
[  183.663691] R13: 00007ffe1e81e980 R14: 0000000000000000 R15: 0000000000000000

Changes since v1:
     - Updated if condition with range_overflows_t [Chris Wilson]

Fixes: 9f909e215f ("drm/i915: Implement vm_ops->access for gdb access into mmaps")
Signed-off-by: Mastan Katragadda <mastanx.katragadda@intel.com>
Suggested-by: Adam Zabrocki <adamza@microsoft.com>
Reported-by: Jackson Cody <cody.jackson@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Sudeep Dutt <sudeep.dutt@intel.com>
Cc: <stable@vger.kernel.org> # v5.8+
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
[mauld: tidy up the commit message and add Cc: stable]
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220303060428.1668844-1-mastanx.katragadda@intel.com
2022-03-11 10:28:20 +00:00
arch Linux 5.17-rc4 2022-02-14 10:52:27 +10:00
block block: bio-integrity: Advance seed correctly for larger interval sizes 2022-02-03 21:09:24 -07:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2022-02-09 09:53:56 -08:00
Documentation drm-misc-next for v5.18: 2022-02-25 05:50:18 +10:00
drivers drm/i915/gem: add missing boundary check in vm_access 2022-03-11 10:28:20 +00:00
fs 3 small smb3 reconnect fixes and an error log clarification 2022-02-13 09:16:45 -08:00
include Merge drm/drm-next into drm-intel-gt-next 2022-02-25 13:44:44 +00:00
init lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() 2022-01-22 08:33:37 +02:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel - Fix a NULL-ptr dereference when recalculating a sched entity's weight 2022-02-13 09:27:26 -08:00
lib lib/crypto: blake2s: avoid indirect calls to compression function for Clang CFI 2022-02-04 19:22:32 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm kfence: make test case compatible with run time set sample interval 2022-02-11 17:55:00 -08:00
net Networking fixes for 5.17-rc4, including fixes from netfilter and can. 2022-02-10 16:01:22 -08:00
samples samples/seccomp: Adjust sample to also provide kill option 2022-02-10 19:09:12 -08:00
scripts kconfig: fix failing to generate auto.conf 2022-02-12 23:24:19 +09:00
security drm-misc-next for v5.18: 2022-02-25 05:50:18 +10:00
sound ASoC: Fixes for v5.17 2022-02-01 16:52:54 +01:00
tools Tracing fixes: 2022-02-11 10:22:48 -08:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt Two larger x86 series: 2022-01-28 19:00:26 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update Christian Brauner's email address 2022-02-01 11:21:31 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Removing Ohad from remoteproc/rpmsg maintenance 2021-12-08 10:09:40 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS drm-misc-next for v5.18: 2022-02-25 05:50:18 +10:00
Makefile Linux 5.17-rc4 2022-02-13 12:13:30 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 Restructured Text 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.