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Chris Wilson 25ffaa6745 drm/i915: Pass the right flags to i915_vma_move_to_active() 
i915_vma_move_to_active() takes the execobject flags and not a boolean!
Instead of passing EXEC_OBJECT_WRITE we passed true [i.e.
EXEC_OBJECT_NEEDS_FENCE] causing us to start tracking the
vma->last_fence access and since we forgot to clear that on unbinding,
we caused a use-after-free.

[  321.263854] BUG: KASAN: use-after-free in i915_gem_request_retire+0x1728/0x1740 [i915]
[  321.264001] Read of size 8 at addr ffff880100fc67d8 by task gem_exec_reloc/2868

[  321.264181] CPU: 0 PID: 2868 Comm: gem_exec_reloc Not tainted 4.12.0-rc6-CI-Custom_2759+ #1
[  321.264195] Hardware name: GIGABYTE GB-BXBT-1900/MZBAYAB-00, BIOS F6 02/17/2015
[  321.264208] Call Trace:
[  321.264234]  dump_stack+0x67/0x99
[  321.264260]  print_address_description+0x77/0x290
[  321.264437]  ? i915_gem_request_retire+0x1728/0x1740 [i915]
[  321.264459]  kasan_report+0x269/0x350
[  321.264487]  __asan_report_load8_noabort+0x14/0x20
[  321.264660]  i915_gem_request_retire+0x1728/0x1740 [i915]
[  321.264841]  ? intel_ring_context_pin+0x131/0x690 [i915]
[  321.265021]  i915_gem_request_alloc+0x2c6/0x1220 [i915]
[  321.265044]  ? _raw_spin_unlock_irqrestore+0x3d/0x60
[  321.265226]  i915_gem_do_execbuffer+0xac0/0x2a20 [i915]
[  321.265250]  ? __lock_acquire+0xceb/0x5450
[  321.265269]  ? entry_SYSCALL_64_fastpath+0x1c/0xb1
[  321.265291]  ? kvmalloc_node+0x6b/0x80
[  321.265310]  ? kvmalloc_node+0x6b/0x80
[  321.265489]  ? eb_relocate_slow+0xbe0/0xbe0 [i915]
[  321.265520]  ? ___slab_alloc.constprop.28+0x2ab/0x3d0
[  321.265549]  ? debug_check_no_locks_freed+0x280/0x280
[  321.265591]  ? __might_fault+0xc6/0x1b0
[  321.265782]  i915_gem_execbuffer2+0x14a/0x3f0 [i915]
[  321.265815]  drm_ioctl+0x4ba/0xaa0
[  321.265986]  ? i915_gem_execbuffer+0xde0/0xde0 [i915]
[  321.266017]  ? drm_getunique+0x270/0x270
[  321.266068]  do_vfs_ioctl+0x17f/0xfa0
[  321.266091]  ? __fget+0x1ba/0x330
[  321.266112]  ? lock_acquire+0x390/0x390
[  321.266133]  ? ioctl_preallocate+0x1d0/0x1d0
[  321.266164]  ? __fget+0x1db/0x330
[  321.266194]  ? __fget_light+0x79/0x1f0
[  321.266219]  SyS_ioctl+0x3c/0x70
[  321.266247]  entry_SYSCALL_64_fastpath+0x1c/0xb1
[  321.266265] RIP: 0033:0x7fcede207357
[  321.266279] RSP: 002b:00007ffef0effe58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  321.266307] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcede207357
[  321.266321] RDX: 00007ffef0effef0 RSI: 0000000040406469 RDI: 0000000000000004
[  321.266335] RBP: ffffffff812097c6 R08: 0000000000000008 R09: 0000000000000000
[  321.266349] R10: 0000000000000008 R11: 0000000000000246 R12: ffff880116bcff98
[  321.266363] R13: ffffffff81cb7cb3 R14: ffff880116bcff70 R15: 0000000000000000
[  321.266385]  ? __this_cpu_preempt_check+0x13/0x20
[  321.266406]  ? trace_hardirqs_off_caller+0x1d6/0x2c0

[  321.266487] Allocated by task 2868:
[  321.266568]  save_stack_trace+0x16/0x20
[  321.266586]  kasan_kmalloc+0xee/0x180
[  321.266602]  kasan_slab_alloc+0x12/0x20
[  321.266620]  kmem_cache_alloc+0xc7/0x2e0
[  321.266795]  i915_vma_instance+0x28c/0x1540 [i915]
[  321.266964]  eb_lookup_vmas+0x5a7/0x2250 [i915]
[  321.267130]  i915_gem_do_execbuffer+0x69a/0x2a20 [i915]
[  321.267296]  i915_gem_execbuffer2+0x14a/0x3f0 [i915]
[  321.267315]  drm_ioctl+0x4ba/0xaa0
[  321.267333]  do_vfs_ioctl+0x17f/0xfa0
[  321.267350]  SyS_ioctl+0x3c/0x70
[  321.267369]  entry_SYSCALL_64_fastpath+0x1c/0xb1

[  321.267428] Freed by task 177:
[  321.267502]  save_stack_trace+0x16/0x20
[  321.267521]  kasan_slab_free+0xad/0x180
[  321.267539]  kmem_cache_free+0xc5/0x340
[  321.267710]  i915_vma_unbind+0x666/0x10a0 [i915]
[  321.267880]  i915_vma_close+0x23a/0x2f0 [i915]
[  321.268048]  __i915_gem_free_objects+0x17d/0xc70 [i915]
[  321.268215]  __i915_gem_free_work+0x49/0x70 [i915]
[  321.268234]  process_one_work+0x66f/0x1410
[  321.268252]  worker_thread+0xe1/0xe90
[  321.268269]  kthread+0x304/0x410
[  321.268285]  ret_from_fork+0x27/0x40

[  321.268346] The buggy address belongs to the object at ffff880100fc6640
                which belongs to the cache i915_vma of size 656
[  321.268550] The buggy address is located 408 bytes inside of
                656-byte region [ffff880100fc6640, ffff880100fc68d0)
[  321.268741] The buggy address belongs to the page:
[  321.268837] page:ffffea000403f000 count:1 mapcount:0 mapping:          (null) index:0xffff880100fc5980 compound_mapcount: 0
[  321.269045] flags: 0x8000000000008100(slab|head)
[  321.269147] raw: 8000000000008100 0000000000000000 ffff880100fc5980 00000001001e001d
[  321.269312] raw: ffffea0004038e20 ffff880116b46240 ffff88011646c640 0000000000000000
[  321.269484] page dumped because: kasan: bad access detected

[  321.269665] Memory state around the buggy address:
[  321.269778]  ffff880100fc6680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  321.269949]  ffff880100fc6700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  321.270115] >ffff880100fc6780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  321.270279]                                                     ^
[  321.270410]  ffff880100fc6800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  321.270576]  ffff880100fc6880: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
[  321.270740] ==================================================================
[  321.270903] Disabling lock debugging due to kernel taint

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101511
Fixes: 7dd4f6729f ("drm/i915: Async GPU relocation processing")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170620124321.1108-2-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
2017-06-20 21:10:30 +01:00
arch powerpc fixes for 4.12 #4 2017-05-27 09:28:34 -07:00
block Merge branch 'nvme-4.12' of git://git.infradead.org/nvme into for-linus 2017-05-26 09:11:19 -06:00
certs scripts/spelling.txt: add "intialise(d)" pattern and fix typo instances 2017-05-08 17:15:13 -07:00
crypto crypto: skcipher - Add missing API setkey checks 2017-05-18 13:04:05 +08:00
Documentation Linux 4.12-rc3 2017-05-30 15:54:15 +10:00
drivers drm/i915: Pass the right flags to i915_vma_move_to_active() 2017-06-20 21:10:30 +01:00
firmware firmware/Makefile: force recompilation if makefile changes 2017-05-08 17:15:10 -07:00
fs Changed since last update: 2017-05-26 12:13:08 -07:00
include drm/i915: Allow execbuffer to use the first object as the batch 2017-06-16 16:54:05 +01:00
init Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-10 10:30:46 -07:00
ipc mm: introduce kv[mz]alloc helpers 2017-05-08 17:15:12 -07:00
kernel Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-27 09:14:24 -07:00
lib test_bpf: Add a couple of tests for BPF_JSGE. 2017-05-25 14:37:56 -04:00
mm mm: vmscan: scan until it finds eligible pages 2017-05-12 15:57:16 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-05-26 13:51:01 -07:00
samples samples/bpf: run cleanup routines when receiving SIGTERM 2017-05-11 21:43:30 -04:00
scripts DeviceTree fixes for 4.12-rc: 2017-05-19 15:03:24 -07:00
security Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-05-09 09:12:53 -07:00
sound Linux 4.12-rc3 2017-05-30 15:54:15 +10:00
tools powerpc fixes for 4.12 #4 2017-05-27 09:28:34 -07:00
usr initramfs: provide a way to ignore image provided by bootloader 2017-05-08 17:15:12 -07:00
virt KVM: arm/arm64: Hold slots_lock when unregistering kvm io bus devices 2017-05-18 11:18:16 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore kbuild: Add support to generate LLVM assembly files 2017-04-25 08:13:52 +09:00
.mailmap power supply and reset changes for the v4.12 series (part 2) 2017-05-12 12:02:21 -07:00
COPYING
CREDITS avr32: remove support for AVR32 architecture 2017-05-01 09:27:15 +02:00
Kbuild kbuild: Consolidate header generation from ASM offset information 2017-04-13 05:43:37 +09:00
Kconfig
MAINTAINERS Linux 4.12-rc3 2017-05-30 15:54:15 +10:00
Makefile Linux 4.12-rc3 2017-05-28 17:20:53 -07:00
README

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.