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Zhanjun Dong 59a1c9c7e1 drm/xe: Prevent null pointer access in xe_migrate_copy 
xe_migrate_copy designed to copy content of TTM resources. When source
resource is null, it will trigger a NULL pointer dereference in
xe_migrate_copy. To avoid this situation, update lacks source flag to
true for this case, the flag will trigger xe_migrate_clear rather than
xe_migrate_copy.

Issue trace:
<7> [317.089847] xe 0000:00:02.0: [drm:xe_migrate_copy [xe]] Pass 14,
 sizes: 4194304 & 4194304
<7> [317.089945] xe 0000:00:02.0: [drm:xe_migrate_copy [xe]] Pass 15,
 sizes: 4194304 & 4194304
<1> [317.128055] BUG: kernel NULL pointer dereference, address:
 0000000000000010
<1> [317.128064] #PF: supervisor read access in kernel mode
<1> [317.128066] #PF: error_code(0x0000) - not-present page
<6> [317.128069] PGD 0 P4D 0
<4> [317.128071] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
<4> [317.128074] CPU: 1 UID: 0 PID: 1440 Comm: kunit_try_catch Tainted:
 G     U           N 6.11.0-rc7-xe #1
<4> [317.128078] Tainted: [U]=USER, [N]=TEST
<4> [317.128080] Hardware name: Intel Corporation Lunar Lake Client
 Platform/LNL-M LP5 RVP1, BIOS LNLMFWI1.R00.3221.D80.2407291239 07/29/2024
<4> [317.128082] RIP: 0010:xe_migrate_copy+0x66/0x13e0 [xe]
<4> [317.128158] Code: 00 00 48 89 8d e0 fe ff ff 48 8b 40 10 4c 89 85 c8
 fe ff ff 44 88 8d bd fe ff ff 65 48 8b 3c 25 28 00 00 00 48 89 7d d0 31
 ff <8b> 79 10 48 89 85 a0 fe ff ff 48 8b 00 48 89 b5 d8 fe ff ff 83 ff
<4> [317.128162] RSP: 0018:ffffc9000167f9f0 EFLAGS: 00010246
<4> [317.128164] RAX: ffff8881120d8028 RBX: ffff88814d070428 RCX:
 0000000000000000
<4> [317.128166] RDX: ffff88813cb99c00 RSI: 0000000004000000 RDI:
 0000000000000000
<4> [317.128168] RBP: ffffc9000167fbb8 R08: ffff88814e7b1f08 R09:
 0000000000000001
<4> [317.128170] R10: 0000000000000001 R11: 0000000000000001 R12:
 ffff88814e7b1f08
<4> [317.128172] R13: ffff88814e7b1f08 R14: ffff88813cb99c00 R15:
 0000000000000001
<4> [317.128174] FS:  0000000000000000(0000) GS:ffff88846f280000(0000)
 knlGS:0000000000000000
<4> [317.128176] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [317.128178] CR2: 0000000000000010 CR3: 000000011f676004 CR4:
 0000000000770ef0
<4> [317.128180] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
 0000000000000000
<4> [317.128182] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7:
 0000000000000400
<4> [317.128184] PKRU: 55555554
<4> [317.128185] Call Trace:
<4> [317.128187]  <TASK>
<4> [317.128189]  ? show_regs+0x67/0x70
<4> [317.128194]  ? __die_body+0x20/0x70
<4> [317.128196]  ? __die+0x2b/0x40
<4> [317.128198]  ? page_fault_oops+0x15f/0x4e0
<4> [317.128203]  ? do_user_addr_fault+0x3fb/0x970
<4> [317.128205]  ? lock_acquire+0xc7/0x2e0
<4> [317.128209]  ? exc_page_fault+0x87/0x2b0
<4> [317.128212]  ? asm_exc_page_fault+0x27/0x30
<4> [317.128216]  ? xe_migrate_copy+0x66/0x13e0 [xe]
<4> [317.128263]  ? __lock_acquire+0xb9d/0x26f0
<4> [317.128265]  ? __lock_acquire+0xb9d/0x26f0
<4> [317.128267]  ? sg_free_append_table+0x20/0x80
<4> [317.128271]  ? lock_acquire+0xc7/0x2e0
<4> [317.128273]  ? mark_held_locks+0x4d/0x80
<4> [317.128275]  ? trace_hardirqs_on+0x1e/0xd0
<4> [317.128278]  ? _raw_spin_unlock_irqrestore+0x31/0x60
<4> [317.128281]  ? __pm_runtime_resume+0x60/0xa0
<4> [317.128284]  xe_bo_move+0x682/0xc50 [xe]
<4> [317.128315]  ? lock_is_held_type+0xaa/0x120
<4> [317.128318]  ttm_bo_handle_move_mem+0xe5/0x1a0 [ttm]
<4> [317.128324]  ttm_bo_validate+0xd1/0x1a0 [ttm]
<4> [317.128328]  shrink_test_run_device+0x721/0xc10 [xe]
<4> [317.128360]  ? find_held_lock+0x31/0x90
<4> [317.128363]  ? lock_release+0xd1/0x2a0
<4> [317.128365]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
 [kunit]
<4> [317.128370]  xe_bo_shrink_kunit+0x11/0x20 [xe]
<4> [317.128397]  kunit_try_run_case+0x6e/0x150 [kunit]
<4> [317.128400]  ? trace_hardirqs_on+0x1e/0xd0
<4> [317.128402]  ? _raw_spin_unlock_irqrestore+0x31/0x60
<4> [317.128404]  kunit_generic_run_threadfn_adapter+0x1e/0x40 [kunit]
<4> [317.128407]  kthread+0xf5/0x130
<4> [317.128410]  ? __pfx_kthread+0x10/0x10
<4> [317.128412]  ret_from_fork+0x39/0x60
<4> [317.128415]  ? __pfx_kthread+0x10/0x10
<4> [317.128416]  ret_from_fork_asm+0x1a/0x30
<4> [317.128420]  </TASK>

Fixes: 266c858852 ("drm/xe/xe2: Handle flat ccs move for igfx.")
Signed-off-by: Zhanjun Dong <zhanjun.dong@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240927161308.862323-2-zhanjun.dong@intel.com
History 2024-10-01 14:27:07 -07:00
arch Linux 6.11-rc7 2024-09-11 09:18:15 +02:00
block bio-integrity: don't restrict the size of integrity metadata 2024-09-04 07:17:00 -06:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto crypto: testmgr - generate power-of-2 lengths more often 2024-07-13 11:50:28 +12:00
Documentation Linux 6.11-rc7 2024-09-11 09:18:15 +02:00
drivers drm/xe: Prevent null pointer access in xe_migrate_copy 2024-10-01 14:27:07 -07:00
fs Linux 6.11-rc7 2024-09-11 09:18:15 +02:00
include drm/xe/pciid: Add new PCI id for ARL 2024-09-20 13:39:04 -07:00
init Rust fixes for v6.11 2024-08-16 11:24:06 -07:00
io_uring io_uring/kbuf: return correct iovec count from classic buffer peek 2024-08-30 10:45:54 -06:00
ipc sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
kernel Linux 6.11-rc7 2024-09-11 09:18:15 +02:00
lib linux_kselftest-kunit-fixes-6.11-rc7 2024-09-05 09:43:38 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm vfs-6.11-rc7.fixes 2024-09-04 09:33:57 -07:00
net ila: call nf_unregister_net_hooks() sooner 2024-09-05 14:57:12 -07:00
rust rust: macros: provide correct provenance when constructing THIS_MODULE 2024-09-02 09:14:28 +02:00
samples treewide: remove unnecessary <linux/version.h> inclusion 2024-08-12 18:36:44 +09:00
scripts scripts: fix gfp-translate after ___GFP_*_BITS conversion to an enum 2024-09-01 17:59:01 -07:00
security Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging 2024-09-01 09:18:48 +12:00
sound sound fixes for 6.11-rc7 2024-09-06 11:56:03 -07:00
tools RISC-V Fixes for 6.11-rc7 2024-09-06 13:00:59 -07:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM: x86: Disallow read-only memslots for SEV-ES and SEV-SNP (and TDX) 2024-08-14 12:28:24 -04:00
.clang-format Docs: Move clang-format from process/ to dev-tools/ 2024-06-26 16:36:00 -06:00
.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: add script and target to generate pacman package 2024-07-22 01:24:22 +09:00
.mailmap Linux 6.11-rc7 2024-09-11 09:18:15 +02:00
.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 tracing: Update of MAINTAINERS and CREDITS file 2024-07-18 14:08:42 -07:00
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 Linux 6.11-rc7 2024-09-11 09:18:15 +02:00
Makefile Linux 6.11-rc7 2024-09-08 14:50:28 -07:00
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.