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Thomas Zimmermann 0149a4cacc drm/gma500: Fix out-of-bounds access to struct drm_device.vblank[] 
commit 06ad8d3395 upstream.

The gma500 driver expects 3 pipelines in several it's IRQ functions.
Accessing struct drm_device.vblank[], this fails with devices that only
have 2 pipelines. An example KASAN report is shown below.

  [   62.267688] ==================================================================
  [   62.268856] BUG: KASAN: slab-out-of-bounds in psb_irq_postinstall+0x250/0x3c0 [gma500_gfx]
  [   62.269450] Read of size 1 at addr ffff8880012bc6d0 by task systemd-udevd/285
  [   62.269949]
  [   62.270192] CPU: 0 PID: 285 Comm: systemd-udevd Tainted: G            E     5.10.0-rc1-1-default+ #572
  [   62.270807] Hardware name:  /DN2800MT, BIOS MTCDT10N.86A.0164.2012.1213.1024 12/13/2012
  [   62.271366] Call Trace:
  [   62.271705]  dump_stack+0xae/0xe5
  [   62.272180]  print_address_description.constprop.0+0x17/0xf0
  [   62.272987]  ? psb_irq_postinstall+0x250/0x3c0 [gma500_gfx]
  [   62.273474]  __kasan_report.cold+0x20/0x38
  [   62.273989]  ? psb_irq_postinstall+0x250/0x3c0 [gma500_gfx]
  [   62.274460]  kasan_report+0x3a/0x50
  [   62.274891]  psb_irq_postinstall+0x250/0x3c0 [gma500_gfx]
  [   62.275380]  drm_irq_install+0x131/0x1f0
  <...>
  [   62.300751] Allocated by task 285:
  [   62.301223]  kasan_save_stack+0x1b/0x40
  [   62.301731]  __kasan_kmalloc.constprop.0+0xbf/0xd0
  [   62.302293]  drmm_kmalloc+0x55/0x100
  [   62.302773]  drm_vblank_init+0x77/0x210

Resolve the issue by only handling vblank entries up to the number of
CRTCs.

I'm adding a Fixes tag for reference, although the bug has been present
since the driver's initial commit.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Fixes: 5c49fd3aa0 ("gma500: Add the core DRM files and headers")
Cc: Alan Cox <alan@linux.intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: dri-devel@lists.freedesktop.org
Cc: stable@vger.kernel.org#v3.3+
Link: https://patchwork.freedesktop.org/patch/msgid/20201105190256.3893-1-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-18 19:18:50 +01:00
arch ARM: 9019/1: kprobes: Avoid fortify_panic() when copying optprobe template 2020-11-18 19:18:46 +01:00
block blk-cgroup: Pre-allocate tree node on blkg_conf_prep 2020-11-10 12:35:59 +01:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto crypto: algif_skcipher - EBUSY on aio should be an error 2020-10-29 09:55:01 +01:00
Documentation media: videodev2.h: RGB BT2020 and HSV are always full range 2020-11-05 11:08:40 +01:00
drivers drm/gma500: Fix out-of-bounds access to struct drm_device.vblank[] 2020-11-18 19:18:50 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs btrfs: fix potential overflow in cluster_pages_for_defrag on 32bit arch 2020-11-18 19:18:49 +01:00
include netfilter: use actual socket sk rather than skb sk when routing harder 2020-11-18 19:18:44 +01:00
init printk: reduce LOG_BUF_SHIFT range for H8300 2020-11-05 11:08:41 +01:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:18:40 +02:00
kernel don't dump the threads that had been already exiting when zapped. 2020-11-18 19:18:50 +01:00
lib lib/crc32test: remove extra local_irq_disable/enable 2020-11-10 12:35:57 +01:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm mm: mempolicy: fix potential pte_unmap_unlock pte error 2020-11-10 12:35:57 +01:00
net cfg80211: regulatory: Fix inconsistent format argument 2020-11-18 19:18:45 +01:00
samples misc: vop: add round_up(x,4) for vring_size to avoid kernel panic 2020-10-30 10:38:29 +01:00
scripts scripts/setlocalversion: make git describe output more reliable 2020-11-05 11:08:31 +01:00
security selinux: Fix error return code in sel_ib_pkey_sid_slow() 2020-11-18 19:18:50 +01:00
sound ALSA: hda: prevent undefined shift in snd_hdac_ext_bus_get_link() 2020-11-18 19:18:42 +01:00
tools selftests: proc: fix warning: _GNU_SOURCE redefined 2020-11-18 19:18:46 +01:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch 2020-10-01 13:14:54 +02:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS Documentation/llvm: add documentation on building w/ Clang/LLVM 2020-09-26 18:01:31 +02:00
Makefile Linux 4.19.157 2020-11-10 21:11:27 +01:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.