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Message-Id: <a6b4f8a2-7be1-4bc7-9700-fe7e52e21ea4@app.fastmail.com>
Date: Tue, 22 Jul 2025 13:05:02 -0700
From: James <bold.zone2373@...tmail.com>
To: phasta@...nel.org, matthew.brost@...el.com, dakr@...nel.org,
Christian König <ckoenig.leichtzumerken@...il.com>,
maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
airlied@...il.com, simona@...ll.ch, "Shuah Khan" <skhan@...uxfoundation.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-kernel-mentees@...ts.linux.dev,
"Tvrtko Ursulin" <tvrtko.ursulin@...lia.com>
Subject: Re: [PATCH] drm/sched: Prevent stopped entities from being added to the run
queue.
On Mon, Jul 21, 2025, at 1:16 AM, Philipp Stanner wrote:
> On Mon, 2025-07-21 at 09:52 +0200, Philipp Stanner wrote:
>> +Cc Tvrtko, who's currently reworking FIFO and RR.
>>
>> On Sun, 2025-07-20 at 16:56 -0700, James Flowers wrote:
>> > Fixes an issue where entities are added to the run queue in
>> > drm_sched_rq_update_fifo_locked after being killed, causing a
>> > slab-use-after-free error.
>> >
>> > Signed-off-by: James Flowers <bold.zone2373@...tmail.com>
>> > ---
>> > This issue was detected by syzkaller running on a Steam Deck OLED.
>> > Unfortunately I don't have a reproducer for it. I've
>>
>> Well, now that's kind of an issue – if you don't have a reproducer, how
>> can you know that your patch is correct? How can we?
>>
>> It would certainly be good to know what the fuzz testing framework
>> does.
>>
>> > included the KASAN reports below:
>>
>>
>> Anyways, KASAN reports look interesting. But those might be many
>> different issues. Again, would be good to know what the fuzzer has been
>> testing. Can you maybe split this fuzz test into sub-tests? I suspsect
>> those might be different faults.
>>
>>
>> Anyways, taking a first look…
>>
>>
>> >
>> > ==================================================================
>> > BUG: KASAN: slab-use-after-free in rb_next+0xda/0x160 lib/rbtree.c:505
>> > Read of size 8 at addr ffff8881805085e0 by task kworker/u32:12/192
>> > CPU: 3 UID: 0 PID: 192 Comm: kworker/u32:12 Not tainted 6.14.0-flowejam-+ #1
>> > Hardware name: Valve Galileo/Galileo, BIOS F7G0112 08/01/2024
>> > Workqueue: sdma0 drm_sched_run_job_work [gpu_sched]
>> > Call Trace:
>> > <TASK>
>> > __dump_stack lib/dump_stack.c:94 [inline]
>> > dump_stack_lvl+0xd2/0x130 lib/dump_stack.c:120
>> > print_address_description.constprop.0+0x88/0x380 mm/kasan/report.c:408
>> > print_report+0xfc/0x1ff mm/kasan/report.c:521
>> > kasan_report+0xdd/0x1b0 mm/kasan/report.c:634
>> > rb_next+0xda/0x160 lib/rbtree.c:505
>> > drm_sched_rq_select_entity_fifo drivers/gpu/drm/scheduler/sched_main.c:332 [inline] [gpu_sched]
>> > drm_sched_select_entity+0x497/0x720 drivers/gpu/drm/scheduler/sched_main.c:1081 [gpu_sched]
>> > drm_sched_run_job_work+0x2e/0x710 drivers/gpu/drm/scheduler/sched_main.c:1206 [gpu_sched]
>> > process_one_work+0x9c0/0x17e0 kernel/workqueue.c:3238
>> > process_scheduled_works kernel/workqueue.c:3319 [inline]
>> > worker_thread+0x734/0x1060 kernel/workqueue.c:3400
>> > kthread+0x3fd/0x810 kernel/kthread.c:464
>> > ret_from_fork+0x53/0x80 arch/x86/kernel/process.c:148
>> > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>> > </TASK>
>> > Allocated by task 73472:
>> > kasan_save_stack+0x30/0x50 mm/kasan/common.c:47
>> > kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>> > poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
>> > __kasan_kmalloc+0x9a/0xb0 mm/kasan/common.c:394
>> > kmalloc_noprof include/linux/slab.h:901 [inline] [amdgpu]
>> > kzalloc_noprof include/linux/slab.h:1037 [inline] [amdgpu]
>> > amdgpu_driver_open_kms+0x151/0x660 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1402 [amdgpu]
>> > drm_file_alloc+0x5d0/0xa00 drivers/gpu/drm/drm_file.c:171
>> > drm_open_helper+0x1fe/0x540 drivers/gpu/drm/drm_file.c:323
>> > drm_open+0x1a7/0x400 drivers/gpu/drm/drm_file.c:376
>> > drm_stub_open+0x21a/0x390 drivers/gpu/drm/drm_drv.c:1149
>> > chrdev_open+0x23b/0x6b0 fs/char_dev.c:414
>> > do_dentry_open+0x743/0x1bf0 fs/open.c:956
>> > vfs_open+0x87/0x3f0 fs/open.c:1086
>> > do_open+0x72f/0xf80 fs/namei.c:3830
>> > path_openat+0x2ec/0x770 fs/namei.c:3989
>> > do_filp_open+0x1ff/0x420 fs/namei.c:4016
>> > do_sys_openat2+0x181/0x1e0 fs/open.c:1428
>> > do_sys_open fs/open.c:1443 [inline]
>> > __do_sys_openat fs/open.c:1459 [inline]
>> > __se_sys_openat fs/open.c:1454 [inline]
>> > __x64_sys_openat+0x149/0x210 fs/open.c:1454
>> > do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>> > do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > Freed by task 73472:
>> > kasan_save_stack+0x30/0x50 mm/kasan/common.c:47
>> > kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>> > kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:576
>> > poison_slab_object mm/kasan/common.c:247 [inline]
>> > __kasan_slab_free+0x52/0x70 mm/kasan/common.c:264
>> > kasan_slab_free include/linux/kasan.h:233 [inline]
>> > slab_free_hook mm/slub.c:2353 [inline]
>> > slab_free mm/slub.c:4609 [inline]
>> > kfree+0x14f/0x4d0 mm/slub.c:4757
>> > amdgpu_driver_postclose_kms+0x43d/0x6b0 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1538 [amdgpu]
>> > drm_file_free.part.0+0x72d/0xbc0 drivers/gpu/drm/drm_file.c:255
>> > drm_file_free drivers/gpu/drm/drm_file.c:228 [inline]
>> > drm_close_helper.isra.0+0x197/0x230 drivers/gpu/drm/drm_file.c:278
>> > drm_release+0x1b0/0x3d0 drivers/gpu/drm/drm_file.c:426
>> > __fput+0x402/0xb50 fs/file_table.c:464
>> > task_work_run+0x155/0x250 kernel/task_work.c:227
>> > get_signal+0x1be/0x19d0 kernel/signal.c:2809
>> > arch_do_signal_or_restart+0x96/0x3a0 arch/x86/kernel/signal.c:337
>> > exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
>> > exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
>> > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>> > syscall_exit_to_user_mode+0x1fc/0x290 kernel/entry/common.c:218
>> > do_syscall_64+0x9f/0x180 arch/x86/entry/common.c:89
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > The buggy address belongs to the object at ffff888180508000
>> > The buggy address is located 1504 bytes inside of
>> > The buggy address belongs to the physical page:
>> > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x180508
>> > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
>> > flags: 0x17ffffc0000040(head|node=0|zone=2|lastcpupid=0x1fffff)
>> > page_type: f5(slab)
>> > raw: 0017ffffc0000040 ffff888100043180 dead000000000100 dead000000000122
>> > raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000
>> > head: 0017ffffc0000040 ffff888100043180 dead000000000100 dead000000000122
>> > head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000
>> > head: 0017ffffc0000003 ffffea0006014201 ffffffffffffffff 0000000000000000
>> > head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
>> > page dumped because: kasan: bad access detected
>> > Memory state around the buggy address:
>> > ffff888180508480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ffff888180508500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > > ffff888180508580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ^
>> > ffff888180508600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ffff888180508680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ==================================================================
>> > ==================================================================
>> > BUG: KASAN: slab-use-after-free in rb_set_parent_color include/linux/rbtree_augmented.h:191 [inline]
>> > BUG: KASAN: slab-use-after-free in __rb_erase_augmented include/linux/rbtree_augmented.h:312 [inline]
>> > BUG: KASAN: slab-use-after-free in rb_erase+0x157c/0x1b10 lib/rbtree.c:443
>> > Write of size 8 at addr ffff88816414c5d0 by task syz.2.3004/12376
>> > CPU: 7 UID: 65534 PID: 12376 Comm: syz.2.3004 Not tainted 6.14.0-flowejam-+ #1
>> > Hardware name: Valve Galileo/Galileo, BIOS F7G0112 08/01/2024
>> > Call Trace:
>> > <TASK>
>> > __dump_stack lib/dump_stack.c:94 [inline]
>> > dump_stack_lvl+0xd2/0x130 lib/dump_stack.c:120
>> > print_address_description.constprop.0+0x88/0x380 mm/kasan/report.c:408
>> > print_report+0xfc/0x1ff mm/kasan/report.c:521
>> > kasan_report+0xdd/0x1b0 mm/kasan/report.c:634
>> > rb_set_parent_color include/linux/rbtree_augmented.h:191 [inline]
>> > __rb_erase_augmented include/linux/rbtree_augmented.h:312 [inline]
>> > rb_erase+0x157c/0x1b10 lib/rbtree.c:443
>> > rb_erase_cached include/linux/rbtree.h:126 [inline] [gpu_sched]
>> > drm_sched_rq_remove_fifo_locked drivers/gpu/drm/scheduler/sched_main.c:154 [inline] [gpu_sched]
>> > drm_sched_rq_remove_entity+0x2d3/0x480 drivers/gpu/drm/scheduler/sched_main.c:243 [gpu_sched]
>> > drm_sched_entity_kill.part.0+0x82/0x5e0 drivers/gpu/drm/scheduler/sched_entity.c:237 [gpu_sched]
>> > drm_sched_entity_kill drivers/gpu/drm/scheduler/sched_entity.c:232 [inline] [gpu_sched]
>> > drm_sched_entity_fini+0x4c/0x290 drivers/gpu/drm/scheduler/sched_entity.c:331 [gpu_sched]
>> > amdgpu_vm_fini_entities drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:529 [inline] [amdgpu]
>> > amdgpu_vm_fini+0x862/0x1180 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2752 [amdgpu]
>> > amdgpu_driver_postclose_kms+0x3db/0x6b0 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1526 [amdgpu]
>> > drm_file_free.part.0+0x72d/0xbc0 drivers/gpu/drm/drm_file.c:255
>> > drm_file_free drivers/gpu/drm/drm_file.c:228 [inline]
>> > drm_close_helper.isra.0+0x197/0x230 drivers/gpu/drm/drm_file.c:278
>> > drm_release+0x1b0/0x3d0 drivers/gpu/drm/drm_file.c:426
>> > __fput+0x402/0xb50 fs/file_table.c:464
>> > task_work_run+0x155/0x250 kernel/task_work.c:227
>> > exit_task_work include/linux/task_work.h:40 [inline]
>> > do_exit+0x841/0xf60 kernel/exit.c:938
>> > do_group_exit+0xda/0x2b0 kernel/exit.c:1087
>> > get_signal+0x171f/0x19d0 kernel/signal.c:3036
>> > arch_do_signal_or_restart+0x96/0x3a0 arch/x86/kernel/signal.c:337
>> > exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
>> > exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
>> > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>> > syscall_exit_to_user_mode+0x1fc/0x290 kernel/entry/common.c:218
>> > do_syscall_64+0x9f/0x180 arch/x86/entry/common.c:89
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > RIP: 0033:0x7f2d90da36ed
>> > Code: Unable to access opcode bytes at 0x7f2d90da36c3.
>> > RSP: 002b:00007f2d91b710d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
>> > RAX: 0000000000000000 RBX: 00007f2d90fe6088 RCX: 00007f2d90da36ed
>> > RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2d90fe6088
>> > RBP: 00007f2d90fe6080 R08: 0000000000000000 R09: 0000000000000000
>> > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d90fe608c
>> > R13: 0000000000000000 R14: 0000000000000002 R15: 00007ffc34a67bd0
>> > </TASK>
>> > Allocated by task 12381:
>> > kasan_save_stack+0x30/0x50 mm/kasan/common.c:47
>> > kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>> > poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
>> > __kasan_kmalloc+0x9a/0xb0 mm/kasan/common.c:394
>> > kmalloc_noprof include/linux/slab.h:901 [inline] [amdgpu]
>> > kzalloc_noprof include/linux/slab.h:1037 [inline] [amdgpu]
>> > amdgpu_driver_open_kms+0x151/0x660 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1402 [amdgpu]
>> > drm_file_alloc+0x5d0/0xa00 drivers/gpu/drm/drm_file.c:171
>> > drm_open_helper+0x1fe/0x540 drivers/gpu/drm/drm_file.c:323
>> > drm_open+0x1a7/0x400 drivers/gpu/drm/drm_file.c:376
>> > drm_stub_open+0x21a/0x390 drivers/gpu/drm/drm_drv.c:1149
>> > chrdev_open+0x23b/0x6b0 fs/char_dev.c:414
>> > do_dentry_open+0x743/0x1bf0 fs/open.c:956
>> > vfs_open+0x87/0x3f0 fs/open.c:1086
>> > do_open+0x72f/0xf80 fs/namei.c:3830
>> > path_openat+0x2ec/0x770 fs/namei.c:3989
>> > do_filp_open+0x1ff/0x420 fs/namei.c:4016
>> > do_sys_openat2+0x181/0x1e0 fs/open.c:1428
>> > do_sys_open fs/open.c:1443 [inline]
>> > __do_sys_openat fs/open.c:1459 [inline]
>> > __se_sys_openat fs/open.c:1454 [inline]
>> > __x64_sys_openat+0x149/0x210 fs/open.c:1454
>> > do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>> > do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > Freed by task 12381:
>> > kasan_save_stack+0x30/0x50 mm/kasan/common.c:47
>> > kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>> > kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:576
>> > poison_slab_object mm/kasan/common.c:247 [inline]
>> > __kasan_slab_free+0x52/0x70 mm/kasan/common.c:264
>> > kasan_slab_free include/linux/kasan.h:233 [inline]
>> > slab_free_hook mm/slub.c:2353 [inline]
>> > slab_free mm/slub.c:4609 [inline]
>> > kfree+0x14f/0x4d0 mm/slub.c:4757
>> > amdgpu_driver_postclose_kms+0x43d/0x6b0 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1538 [amdgpu]
>> > drm_file_free.part.0+0x72d/0xbc0 drivers/gpu/drm/drm_file.c:255
>> > drm_file_free drivers/gpu/drm/drm_file.c:228 [inline]
>> > drm_close_helper.isra.0+0x197/0x230 drivers/gpu/drm/drm_file.c:278
>> > drm_release+0x1b0/0x3d0 drivers/gpu/drm/drm_file.c:426
>> > __fput+0x402/0xb50 fs/file_table.c:464
>> > task_work_run+0x155/0x250 kernel/task_work.c:227
>> > get_signal+0x1be/0x19d0 kernel/signal.c:2809
>> > arch_do_signal_or_restart+0x96/0x3a0 arch/x86/kernel/signal.c:337
>> > exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
>> > exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
>> > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>> > syscall_exit_to_user_mode+0x1fc/0x290 kernel/entry/common.c:218
>> > do_syscall_64+0x9f/0x180 arch/x86/entry/common.c:89
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > The buggy address belongs to the object at ffff88816414c000
>> > The buggy address is located 1488 bytes inside of
>> > The buggy address belongs to the physical page:
>> > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x164148
>> > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
>> > flags: 0x17ffffc0000040(head|node=0|zone=2|lastcpupid=0x1fffff)
>> > page_type: f5(slab)
>> > raw: 0017ffffc0000040 ffff88810005c8c0 dead000000000122 0000000000000000
>> > raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000
>> > head: 0017ffffc0000040 ffff88810005c8c0 dead000000000122 0000000000000000
>> > head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000
>> > head: 0017ffffc0000003 ffffea0005905201 ffffffffffffffff 0000000000000000
>> > head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
>> > page dumped because: kasan: bad access detected
>> > Memory state around the buggy address:
>> > ffff88816414c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ffff88816414c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > > ffff88816414c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ^
>> > ffff88816414c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ffff88816414c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ==================================================================
>> > ==================================================================
>> > BUG: KASAN: slab-use-after-free in __rb_erase_augmented include/linux/rbtree_augmented.h:259 [inline]
>> > BUG: KASAN: slab-use-after-free in rb_erase+0xf5d/0x1b10 lib/rbtree.c:443
>> > Read of size 8 at addr ffff88812ebcc5e0 by task syz.1.814/6553
>> > CPU: 0 UID: 65534 PID: 6553 Comm: syz.1.814 Not tainted 6.14.0-flowejam-+ #1
>> > Hardware name: Valve Galileo/Galileo, BIOS F7G0112 08/01/2024
>> > Call Trace:
>> > <TASK>
>> > __dump_stack lib/dump_stack.c:94 [inline]
>> > dump_stack_lvl+0xd2/0x130 lib/dump_stack.c:120
>> > print_address_description.constprop.0+0x88/0x380 mm/kasan/report.c:408
>> > print_report+0xfc/0x1ff mm/kasan/report.c:521
>> > kasan_report+0xdd/0x1b0 mm/kasan/report.c:634
>> > __rb_erase_augmented include/linux/rbtree_augmented.h:259 [inline]
>> > rb_erase+0xf5d/0x1b10 lib/rbtree.c:443
>> > rb_erase_cached include/linux/rbtree.h:126 [inline] [gpu_sched]
>> > drm_sched_rq_remove_fifo_locked drivers/gpu/drm/scheduler/sched_main.c:154 [inline] [gpu_sched]
>> > drm_sched_rq_remove_entity+0x2d3/0x480 drivers/gpu/drm/scheduler/sched_main.c:243 [gpu_sched]
>> > drm_sched_entity_kill.part.0+0x82/0x5e0 drivers/gpu/drm/scheduler/sched_entity.c:237 [gpu_sched]
>> > drm_sched_entity_kill drivers/gpu/drm/scheduler/sched_entity.c:232 [inline] [gpu_sched]
>> > drm_sched_entity_fini+0x4c/0x290 drivers/gpu/drm/scheduler/sched_entity.c:331 [gpu_sched]
>> > amdgpu_vm_fini_entities drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:529 [inline] [amdgpu]
>> > amdgpu_vm_fini+0x862/0x1180 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2752 [amdgpu]
>> > amdgpu_driver_postclose_kms+0x3db/0x6b0 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1526 [amdgpu]
>> > drm_file_free.part.0+0x72d/0xbc0 drivers/gpu/drm/drm_file.c:255
>> > drm_file_free drivers/gpu/drm/drm_file.c:228 [inline]
>> > drm_close_helper.isra.0+0x197/0x230 drivers/gpu/drm/drm_file.c:278
>> > drm_release+0x1b0/0x3d0 drivers/gpu/drm/drm_file.c:426
>> > __fput+0x402/0xb50 fs/file_table.c:464
>> > task_work_run+0x155/0x250 kernel/task_work.c:227
>> > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
>> > exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
>> > exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
>> > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>> > syscall_exit_to_user_mode+0x26b/0x290 kernel/entry/common.c:218
>> > do_syscall_64+0x9f/0x180 arch/x86/entry/common.c:89
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > RIP: 0033:0x7fd23eba36ed
>> > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
>> > RSP: 002b:00007ffc2943a358 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
>> > RAX: 0000000000000000 RBX: 00007ffc2943a428 RCX: 00007fd23eba36ed
>> > RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
>> > RBP: 00007fd23ede7ba0 R08: 0000000000000001 R09: 0000000c00000000
>> > R10: 00007fd23ea00000 R11: 0000000000000246 R12: 00007fd23ede5fac
>> > R13: 00007fd23ede5fa0 R14: 0000000000059ad1 R15: 0000000000059a8e
>> > </TASK>
>> > Allocated by task 6559:
>> > kasan_save_stack+0x30/0x50 mm/kasan/common.c:47
>> > kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>> > poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
>> > __kasan_kmalloc+0x9a/0xb0 mm/kasan/common.c:394
>> > kmalloc_noprof include/linux/slab.h:901 [inline] [amdgpu]
>> > kzalloc_noprof include/linux/slab.h:1037 [inline] [amdgpu]
>> > amdgpu_driver_open_kms+0x151/0x660 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1402 [amdgpu]
>> > drm_file_alloc+0x5d0/0xa00 drivers/gpu/drm/drm_file.c:171
>> > drm_open_helper+0x1fe/0x540 drivers/gpu/drm/drm_file.c:323
>> > drm_open+0x1a7/0x400 drivers/gpu/drm/drm_file.c:376
>> > drm_stub_open+0x21a/0x390 drivers/gpu/drm/drm_drv.c:1149
>> > chrdev_open+0x23b/0x6b0 fs/char_dev.c:414
>> > do_dentry_open+0x743/0x1bf0 fs/open.c:956
>> > vfs_open+0x87/0x3f0 fs/open.c:1086
>> > do_open+0x72f/0xf80 fs/namei.c:3830
>> > path_openat+0x2ec/0x770 fs/namei.c:3989
>> > do_filp_open+0x1ff/0x420 fs/namei.c:4016
>> > do_sys_openat2+0x181/0x1e0 fs/open.c:1428
>> > do_sys_open fs/open.c:1443 [inline]
>> > __do_sys_openat fs/open.c:1459 [inline]
>> > __se_sys_openat fs/open.c:1454 [inline]
>> > __x64_sys_openat+0x149/0x210 fs/open.c:1454
>> > do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>> > do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > Freed by task 6559:
>> > kasan_save_stack+0x30/0x50 mm/kasan/common.c:47
>> > kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>> > kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:576
>> > poison_slab_object mm/kasan/common.c:247 [inline]
>> > __kasan_slab_free+0x52/0x70 mm/kasan/common.c:264
>> > kasan_slab_free include/linux/kasan.h:233 [inline]
>> > slab_free_hook mm/slub.c:2353 [inline]
>> > slab_free mm/slub.c:4609 [inline]
>> > kfree+0x14f/0x4d0 mm/slub.c:4757
>> > amdgpu_driver_postclose_kms+0x43d/0x6b0 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1538 [amdgpu]
>> > drm_file_free.part.0+0x72d/0xbc0 drivers/gpu/drm/drm_file.c:255
>> > drm_file_free drivers/gpu/drm/drm_file.c:228 [inline]
>> > drm_close_helper.isra.0+0x197/0x230 drivers/gpu/drm/drm_file.c:278
>> > drm_release+0x1b0/0x3d0 drivers/gpu/drm/drm_file.c:426
>> > __fput+0x402/0xb50 fs/file_table.c:464
>> > task_work_run+0x155/0x250 kernel/task_work.c:227
>> > get_signal+0x1be/0x19d0 kernel/signal.c:2809
>> > arch_do_signal_or_restart+0x96/0x3a0 arch/x86/kernel/signal.c:337
>> > exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
>> > exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
>> > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>> > syscall_exit_to_user_mode+0x1fc/0x290 kernel/entry/common.c:218
>> > do_syscall_64+0x9f/0x180 arch/x86/entry/common.c:89
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > The buggy address belongs to the object at ffff88812ebcc000
>> > The buggy address is located 1504 bytes inside of
>> > The buggy address belongs to the physical page:
>> > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12ebc8
>> > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
>> > flags: 0x17ffffc0000040(head|node=0|zone=2|lastcpupid=0x1fffff)
>> > page_type: f5(slab)
>> > raw: 0017ffffc0000040 ffff888100058780 dead000000000122 0000000000000000
>> > raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
>> > head: 0017ffffc0000040 ffff888100058780 dead000000000122 0000000000000000
>> > head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
>> > head: 0017ffffc0000003 ffffea0004baf201 ffffffffffffffff 0000000000000000
>> > head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
>> > page dumped because: kasan: bad access detected
>> > Memory state around the buggy address:
>> > ffff88812ebcc480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ffff88812ebcc500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > > ffff88812ebcc580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ^
>> > ffff88812ebcc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ffff88812ebcc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ==================================================================
>> > ==================================================================
>> > BUG: KASAN: slab-use-after-free in drm_sched_entity_compare_before drivers/gpu/drm/scheduler/sched_main.c:147 [inline] [gpu_sched]
>> > BUG: KASAN: slab-use-after-free in rb_add_cached include/linux/rbtree.h:174 [inline] [gpu_sched]
>> > BUG: KASAN: slab-use-after-free in drm_sched_rq_update_fifo_locked+0x47b/0x540 drivers/gpu/drm/scheduler/sched_main.c:175 [gpu_sched]
>> > Read of size 8 at addr ffff8881208445c8 by task syz.1.49115/146644
>> > CPU: 7 UID: 65534 PID: 146644 Comm: syz.1.49115 Not tainted 6.14.0-flowejam-+ #1
>> > Hardware name: Valve Galileo/Galileo, BIOS F7G0112 08/01/2024
>> > Call Trace:
>> > <TASK>
>> > __dump_stack lib/dump_stack.c:94 [inline]
>> > dump_stack_lvl+0xd2/0x130 lib/dump_stack.c:120
>> > print_address_description.constprop.0+0x88/0x380 mm/kasan/report.c:408
>> > print_report+0xfc/0x1ff mm/kasan/report.c:521
>> > kasan_report+0xdd/0x1b0 mm/kasan/report.c:634
>> > drm_sched_entity_compare_before drivers/gpu/drm/scheduler/sched_main.c:147 [inline] [gpu_sched]
>> > rb_add_cached include/linux/rbtree.h:174 [inline] [gpu_sched]
>> > drm_sched_rq_update_fifo_locked+0x47b/0x540 drivers/gpu/drm/scheduler/sched_main.c:175 [gpu_sched]
>> > drm_sched_entity_push_job+0x509/0x5d0 drivers/gpu/drm/scheduler/sched_entity.c:623 [gpu_sched]
>>
>> This might be a race between entity killing and the push_job. Let's
>> look at your patch below…
>>
>> > amdgpu_job_submit+0x1a4/0x270 drivers/gpu/drm/amd/amdgpu/amdgpu_job.c:314 [amdgpu]
>> > amdgpu_vm_sdma_commit+0x1f9/0x7d0 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c:122 [amdgpu]
>> > amdgpu_vm_pt_clear+0x540/0x6b0 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c:422 [amdgpu]
>> > amdgpu_vm_init+0x9c2/0x12f0 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2609 [amdgpu]
>> > amdgpu_driver_open_kms+0x274/0x660 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1418 [amdgpu]
>> > drm_file_alloc+0x5d0/0xa00 drivers/gpu/drm/drm_file.c:171
>> > drm_open_helper+0x1fe/0x540 drivers/gpu/drm/drm_file.c:323
>> > drm_open+0x1a7/0x400 drivers/gpu/drm/drm_file.c:376
>> > drm_stub_open+0x21a/0x390 drivers/gpu/drm/drm_drv.c:1149
>> > chrdev_open+0x23b/0x6b0 fs/char_dev.c:414
>> > do_dentry_open+0x743/0x1bf0 fs/open.c:956
>> > vfs_open+0x87/0x3f0 fs/open.c:1086
>> > do_open+0x72f/0xf80 fs/namei.c:3830
>> > path_openat+0x2ec/0x770 fs/namei.c:3989
>> > do_filp_open+0x1ff/0x420 fs/namei.c:4016
>> > do_sys_openat2+0x181/0x1e0 fs/open.c:1428
>> > do_sys_open fs/open.c:1443 [inline]
>> > __do_sys_openat fs/open.c:1459 [inline]
>> > __se_sys_openat fs/open.c:1454 [inline]
>> > __x64_sys_openat+0x149/0x210 fs/open.c:1454
>> > do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>> > do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > RIP: 0033:0x7feb303a36ed
>> > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
>> > RSP: 002b:00007feb3123c018 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
>> > RAX: ffffffffffffffda RBX: 00007feb305e5fa0 RCX: 00007feb303a36ed
>> > RDX: 0000000000000002 RSI: 0000200000000140 RDI: ffffffffffffff9c
>> > RBP: 00007feb30447722 R08: 0000000000000000 R09: 0000000000000000
>> > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
>> > R13: 0000000000000001 R14: 00007feb305e5fa0 R15: 00007ffcfd0a3460
>> > </TASK>
>> > Allocated by task 146638:
>> > kasan_save_stack+0x30/0x50 mm/kasan/common.c:47
>> > kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>> > poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
>> > __kasan_kmalloc+0x9a/0xb0 mm/kasan/common.c:394
>> > kmalloc_noprof include/linux/slab.h:901 [inline] [amdgpu]
>> > kzalloc_noprof include/linux/slab.h:1037 [inline] [amdgpu]
>> > amdgpu_driver_open_kms+0x151/0x660 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1402 [amdgpu]
>> > drm_file_alloc+0x5d0/0xa00 drivers/gpu/drm/drm_file.c:171
>> > drm_open_helper+0x1fe/0x540 drivers/gpu/drm/drm_file.c:323
>> > drm_open+0x1a7/0x400 drivers/gpu/drm/drm_file.c:376
>> > drm_stub_open+0x21a/0x390 drivers/gpu/drm/drm_drv.c:1149
>> > chrdev_open+0x23b/0x6b0 fs/char_dev.c:414
>> > do_dentry_open+0x743/0x1bf0 fs/open.c:956
>> > vfs_open+0x87/0x3f0 fs/open.c:1086
>> > do_open+0x72f/0xf80 fs/namei.c:3830
>> > path_openat+0x2ec/0x770 fs/namei.c:3989
>> > do_filp_open+0x1ff/0x420 fs/namei.c:4016
>> > do_sys_openat2+0x181/0x1e0 fs/open.c:1428
>> > do_sys_open fs/open.c:1443 [inline]
>> > __do_sys_openat fs/open.c:1459 [inline]
>> > __se_sys_openat fs/open.c:1454 [inline]
>> > __x64_sys_openat+0x149/0x210 fs/open.c:1454
>> > do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>> > do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > Freed by task 146638:
>> > kasan_save_stack+0x30/0x50 mm/kasan/common.c:47
>> > kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>> > kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:576
>> > poison_slab_object mm/kasan/common.c:247 [inline]
>> > __kasan_slab_free+0x52/0x70 mm/kasan/common.c:264
>> > kasan_slab_free include/linux/kasan.h:233 [inline]
>> > slab_free_hook mm/slub.c:2353 [inline]
>> > slab_free mm/slub.c:4609 [inline]
>> > kfree+0x14f/0x4d0 mm/slub.c:4757
>> > amdgpu_driver_postclose_kms+0x43d/0x6b0 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:1538 [amdgpu]
>> > drm_file_free.part.0+0x72d/0xbc0 drivers/gpu/drm/drm_file.c:255
>> > drm_file_free drivers/gpu/drm/drm_file.c:228 [inline]
>> > drm_close_helper.isra.0+0x197/0x230 drivers/gpu/drm/drm_file.c:278
>> > drm_release+0x1b0/0x3d0 drivers/gpu/drm/drm_file.c:426
>> > __fput+0x402/0xb50 fs/file_table.c:464
>> > task_work_run+0x155/0x250 kernel/task_work.c:227
>> > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
>> > exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
>> > exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
>> > __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>> > syscall_exit_to_user_mode+0x26b/0x290 kernel/entry/common.c:218
>> > do_syscall_64+0x9f/0x180 arch/x86/entry/common.c:89
>> > entry_SYSCALL_64_after_hwframe+0x76/0x7e
>> > The buggy address belongs to the object at ffff888120844000
>> > The buggy address is located 1480 bytes inside of
>> > The buggy address belongs to the physical page:
>> > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120840
>> > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
>> > flags: 0x17ffffc0000040(head|node=0|zone=2|lastcpupid=0x1fffff)
>> > page_type: f5(slab)
>> > raw: 0017ffffc0000040 ffff88810005c8c0 ffffea0005744c00 dead000000000002
>> > raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
>> > head: 0017ffffc0000040 ffff88810005c8c0 ffffea0005744c00 dead000000000002
>> > head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
>> > head: 0017ffffc0000003 ffffea0004821001 ffffffffffffffff 0000000000000000
>> > head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
>> > page dumped because: kasan: bad access detected
>> > Memory state around the buggy address:
>> > ffff888120844480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ffff888120844500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > > ffff888120844580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ^
>> > ffff888120844600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ffff888120844680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> > ==================================================================
>> >
>> > drivers/gpu/drm/scheduler/sched_main.c | 6 ++++--
>> > 1 file changed, 4 insertions(+), 2 deletions(-)
>> >
>> > diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
>> > index bfea608a7106..997a2cc1a635 100644
>> > --- a/drivers/gpu/drm/scheduler/sched_main.c
>> > +++ b/drivers/gpu/drm/scheduler/sched_main.c
>> > @@ -172,8 +172,10 @@ void drm_sched_rq_update_fifo_locked(struct drm_sched_entity *entity,
>> >
>> > entity->oldest_job_waiting = ts;
>> >
>> > - rb_add_cached(&entity->rb_tree_node, &rq->rb_tree_root,
>> > - drm_sched_entity_compare_before);
>> > + if (!entity->stopped) {
>> > + rb_add_cached(&entity->rb_tree_node, &rq->rb_tree_root,
>> > + drm_sched_entity_compare_before);
>> > + }
>>
>> If this is a race, then this patch here is broken, too, because you're
>> checking the 'stopped' boolean as the callers of that function do, too
>> – just later. :O
>>
>> Could still race, just less likely.
>>
>> The proper way to fix it would then be to address the issue where the
>> locking is supposed to happen. Let's look at, for example,
>> drm_sched_entity_push_job():
>>
>>
>> void drm_sched_entity_push_job(struct drm_sched_job *sched_job)
>> {
>> (Bla bla bla)
>>
>> …………
>>
>> /* first job wakes up scheduler */
>> if (first) {
>> struct drm_gpu_scheduler *sched;
>> struct drm_sched_rq *rq;
>>
>> /* Add the entity to the run queue */
>> spin_lock(&entity->lock);
>> if (entity->stopped) { <---- Aha!
>> spin_unlock(&entity->lock);
>>
>> DRM_ERROR("Trying to push to a killed entity\n");
>> return;
>> }
>>
>> rq = entity->rq;
>> sched = rq->sched;
>>
>> spin_lock(&rq->lock);
>> drm_sched_rq_add_entity(rq, entity);
>>
>> if (drm_sched_policy == DRM_SCHED_POLICY_FIFO)
>> drm_sched_rq_update_fifo_locked(entity, rq, submit_ts); <---- bumm!
>>
>> spin_unlock(&rq->lock);
>> spin_unlock(&entity->lock);
>>
>> But the locks are still being hold. So that "shouldn't be happening"(tm).
>>
>> Interesting. AFAICS only drm_sched_entity_kill() and drm_sched_fini()
>> stop entities. The former holds appropriate locks, but drm_sched_fini()
>> doesn't. So that looks like a hot candidate to me. Opinions?
>>
>> On the other hand, aren't drivers prohibited from calling
>> drm_sched_entity_push_job() after calling drm_sched_fini()? If the
>> fuzzer does that, then it's not the scheduler's fault.
>>
>> Could you test adding spin_lock(&entity->lock) to drm_sched_fini()?
>
> Ah no, forget about that.
>
> In drm_sched_fini(), you'd have to take the locks in reverse order as
> in drm_sched_entity_push/pop_job(), thereby replacing race with
> deadlock.
>
> I suspect that this is an issue in amdgpu. But let's wait for
> Christian.
>
>
> P.
>
>
>>
>> Would be cool if Tvrtko and Christian take a look. Maybe we even have a
>> fundamental design issue.
>>
>>
>> Regards
>> P.
>>
>>
>> > }
>> >
>> > /**
>>
Thanks for taking a look at this. I did try to get a reproducer using syzkaller, without success. I can attempt it myself but I expect it will take me some time, if I'm able to at all with this bug. I did run some of the igt-gpu-tools tests (amdgpu and drm ones), and there was no difference after the changes on my system. After this change I wasn't running into the UAF errors after 100k+ executions but I see what you mean, Philipp - perhaps it's missing the root issue.
FYI, as an experiment I forced the use of RR with "drm_sched_policy = DRM_SCHED_POLICY_RR", and I'm not seeing any slab-use-after-frees, so maybe the problem is with the FIFO implementation?
For now, the closest thing to a reproducer I can provide is my syzkaller config, in case anyone else is able to try this with a Steam Deck OLED. I've included this below along with an example program run by syzkaller (in generated C code and a Syz language version).
---------------------------------------------------
{
"target": "linux/amd64",
"http": "127.0.0.1:56741",
"sshkey" : "/path",
"workdir": "/path",
"kernel_obj": "/path",
"kernel_src": "/path",
"syzkaller": "/path",
"sandbox": "setuid",
"type": "isolated",
"enable_syscalls": ["openat$drirender128", "ioctl$DRM_*", "close"],
"disable_syscalls": ["ioctl$DRM_IOCTL_SYNCOBJ_*"],
"reproduce": false,
"vm": {
"targets" : [ "10.0.0.1" ],
"pstore": false,
"target_dir" : "/path",
"target_reboot" : true
}
}
---------------------------------------------------
Generated C program:
// autogenerated by syzkaller (https://github.com/google/syzkaller)
#define _GNU_SOURCE
#include <endian.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
uint64_t r[15] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0, 0x0, 0xffffffffffffffff, 0x0, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
int main(void)
{
syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul);
const char* reason;
(void)reason;
intptr_t res = 0;
if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {}
memcpy((void*)0x200000000200, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000200ul, /*flags=O_SYNC*/0x101000, /*mode=*/0);
if (res != -1)
r[0] = res;
*(uint32_t*)0x200000002440 = 0;
*(uint32_t*)0x200000002444 = 0x80000;
syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc00c642d, /*arg=*/0x200000002440ul);
memcpy((void*)0x2000000001c0, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x2000000001c0ul, /*flags=O_NOFOLLOW|O_CREAT|O_CLOEXEC*/0xa0040, /*mode=*/0);
if (res != -1)
r[1] = res;
syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x4b47, /*arg=*/0ul);
memcpy((void*)0x200000000300, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000300ul, /*flags=O_SYNC|O_NONBLOCK|O_LARGEFILE*/0x109800, /*mode=*/0);
if (res != -1)
r[2] = res;
memcpy((void*)0x200000000100, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000100ul, /*flags=*/0, /*mode=*/0);
if (res != -1)
r[3] = res;
syscall(__NR_ioctl, /*fd=*/r[3], /*cmd=*/0x80f86406, /*arg=*/0ul);
memcpy((void*)0x200000000440, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000440ul, /*flags=O_NONBLOCK|O_CREAT*/0x840, /*mode=*/0);
if (res != -1)
r[4] = res;
*(uint64_t*)0x200000000fc0 = 0;
*(uint32_t*)0x200000000fc8 = 0;
*(uint32_t*)0x200000000fcc = 0;
res = syscall(__NR_ioctl, /*fd=*/r[4], /*cmd=*/0xc06864a1, /*arg=*/0x200000000fc0ul);
if (res != -1)
r[5] = *(uint32_t*)0x200000000fd0;
syscall(__NR_close, /*fd=*/r[2]);
*(uint32_t*)0x200000000000 = 0;
*(uint32_t*)0x200000000004 = 0;
syscall(__NR_ioctl, /*fd=*/r[4], /*cmd=*/0xc00c642d, /*arg=*/0x200000000000ul);
*(uint32_t*)0x200000000040 = 0;
*(uint32_t*)0x200000000044 = 0;
res = syscall(__NR_ioctl, /*fd=*/r[3], /*cmd=*/0xc00c642d, /*arg=*/0x200000000040ul);
if (res != -1)
r[6] = *(uint32_t*)0x200000000048;
*(uint32_t*)0x200000000080 = 0;
res = syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0xc010640b, /*arg=*/0x200000000080ul);
if (res != -1)
r[7] = *(uint32_t*)0x200000000084;
*(uint32_t*)0x2000000000c0 = 0;
res = syscall(__NR_ioctl, /*fd=*/r[4], /*cmd=*/0xc010640b, /*arg=*/0x2000000000c0ul);
if (res != -1)
r[8] = *(uint32_t*)0x2000000000c4;
memcpy((void*)0x2000000001c0, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x2000000001c0ul, /*flags=O_NOFOLLOW|O_CREAT|O_CLOEXEC*/0xa0040, /*mode=*/0);
if (res != -1)
r[9] = res;
syscall(__NR_ioctl, /*fd=*/r[9], /*cmd=*/0x5421, /*arg=*/0ul);
*(uint32_t*)0x200000000180 = r[5];
*(uint32_t*)0x200000000184 = 0x2534dd8;
*(uint32_t*)0x200000000188 = 7;
*(uint32_t*)0x20000000018c = 3;
*(uint32_t*)0x200000000190 = 2;
*(uint32_t*)0x2000000001a4 = 0x97;
*(uint32_t*)0x2000000001a8 = 0x74c83423;
*(uint32_t*)0x2000000001ac = 4;
*(uint32_t*)0x2000000001b0 = 8;
*(uint32_t*)0x2000000001b4 = 6;
*(uint32_t*)0x2000000001b8 = 0x7f;
*(uint32_t*)0x2000000001bc = 0;
*(uint32_t*)0x2000000001c0 = 9;
*(uint64_t*)0x2000000001c8 = 3;
*(uint64_t*)0x2000000001d0 = 0;
*(uint64_t*)0x2000000001d8 = 1;
*(uint64_t*)0x2000000001e0 = 1;
res = syscall(__NR_ioctl, /*fd=*/r[3], /*cmd=*/0xc06864ce, /*arg=*/0x200000000180ul);
if (res != -1)
r[10] = *(uint32_t*)0x200000000198;
*(uint32_t*)0x200000000200 = r[5];
*(uint32_t*)0x200000000204 = 1;
*(uint32_t*)0x200000000208 = 1;
*(uint32_t*)0x20000000020c = 0;
*(uint32_t*)0x200000000210 = 1;
*(uint32_t*)0x200000000214 = r[7];
*(uint32_t*)0x200000000218 = r[8];
*(uint32_t*)0x20000000021c = 0;
*(uint32_t*)0x200000000220 = r[10];
*(uint32_t*)0x200000000224 = 9;
*(uint32_t*)0x200000000228 = 7;
*(uint32_t*)0x20000000022c = 2;
*(uint32_t*)0x200000000230 = 2;
*(uint32_t*)0x200000000234 = 0x400;
*(uint32_t*)0x200000000238 = 0x367;
*(uint32_t*)0x20000000023c = 7;
*(uint32_t*)0x200000000240 = 8;
*(uint64_t*)0x200000000248 = 0x3e;
*(uint64_t*)0x200000000250 = 3;
*(uint64_t*)0x200000000258 = 9;
*(uint64_t*)0x200000000260 = 6;
syscall(__NR_ioctl, /*fd=*/r[6], /*cmd=*/0xc06864b8, /*arg=*/0x200000000200ul);
res = syscall(__NR_ioctl, /*fd=*/r[6], /*cmd=*/0xc0086420, /*arg=*/0x200000000140ul);
if (res != -1)
r[11] = *(uint32_t*)0x200000000140;
*(uint32_t*)0x200000000280 = r[11];
*(uint32_t*)0x200000000284 = 0x26;
syscall(__NR_ioctl, /*fd=*/r[3], /*cmd=*/0x4008642a, /*arg=*/0x200000000280ul);
memcpy((void*)0x200000000300, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000300ul, /*flags=O_SYNC|O_NONBLOCK|O_LARGEFILE*/0x109800, /*mode=*/0);
if (res != -1)
r[12] = res;
memcpy((void*)0x200000000100, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000100ul, /*flags=*/0, /*mode=*/0);
if (res != -1)
r[13] = res;
syscall(__NR_ioctl, /*fd=*/r[13], /*cmd=*/0x80f86406, /*arg=*/0ul);
memcpy((void*)0x200000000440, "/dev/dri/renderD128\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000440ul, /*flags=O_NONBLOCK|O_CREAT*/0x840, /*mode=*/0);
if (res != -1)
r[14] = res;
*(uint64_t*)0x200000000fc0 = 0;
*(uint32_t*)0x200000000fc8 = 0;
*(uint32_t*)0x200000000fcc = 0;
syscall(__NR_ioctl, /*fd=*/r[14], /*cmd=*/0xc06864a1, /*arg=*/0x200000000fc0ul);
syscall(__NR_close, /*fd=*/r[12]);
*(uint32_t*)0x200000000000 = 0;
*(uint32_t*)0x200000000004 = 0;
syscall(__NR_ioctl, /*fd=*/r[14], /*cmd=*/0xc00c642d, /*arg=*/0x200000000000ul);
*(uint32_t*)0x200000000040 = 0;
*(uint32_t*)0x200000000044 = 0;
syscall(__NR_ioctl, /*fd=*/r[13], /*cmd=*/0xc00c642d, /*arg=*/0x200000000040ul);
*(uint32_t*)0x200000000080 = 0;
syscall(__NR_ioctl, /*fd=*/r[12], /*cmd=*/0xc010640b, /*arg=*/0x200000000080ul);
*(uint32_t*)0x2000000000c0 = 0;
syscall(__NR_ioctl, /*fd=*/r[14], /*cmd=*/0xc010640b, /*arg=*/0x2000000000c0ul);
return 0;
}
---------------------------------------------------
Syzkaller program (Syz language):
r0 = openat$drirender128(0xffffffffffffff9c, &(0x7f0000000200), 0x101000, 0x0)
ioctl$DRM_IOCTL_PRIME_HANDLE_TO_FD(r0, 0xc00c642d, &(0x7f0000002440)={0x0, 0x80000})
r1 = openat$drirender128(0xffffffffffffff9c, &(0x7f00000001c0), 0xa0040, 0x0)
ioctl$DRM_IOCTL_RES_CTX(r1, 0x4b47, 0x0)
r2 = openat$drirender128(0xffffffffffffff9c, &(0x7f0000000300), 0x109800, 0x0)
r3 = openat$drirender128(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$DRM_IOCTL_GET_STATS(r3, 0x80f86406, 0x0)
r4 = openat$drirender128(0xffffffffffffff9c, &(0x7f0000000440), 0x840, 0x0)
ioctl$DRM_IOCTL_MODE_GETCRTC(r4, 0xc06864a1, &(0x7f0000000fc0)={0x0, 0x0, 0x0, <r5=>0x0})
close(r2)
ioctl$DRM_IOCTL_PRIME_HANDLE_TO_FD(r4, 0xc00c642d, &(0x7f0000000000))
ioctl$DRM_IOCTL_PRIME_HANDLE_TO_FD(r3, 0xc00c642d, &(0x7f0000000040)={0x0, 0x0, <r6=>0xffffffffffffffff})
ioctl$DRM_IOCTL_GEM_OPEN(r2, 0xc010640b, &(0x7f0000000080)={0x0, <r7=>0x0})
ioctl$DRM_IOCTL_GEM_OPEN(r4, 0xc010640b, &(0x7f00000000c0)={0x0, <r8=>0x0})
r9 = openat$drirender128(0xffffffffffffff9c, &(0x7f00000001c0), 0xa0040, 0x0)
ioctl$DRM_IOCTL_RES_CTX(r9, 0x5421, 0x0)
ioctl$DRM_IOCTL_MODE_GETFB2(r3, 0xc06864ce, &(0x7f0000000180)={r5, 0x2534dd8, 0x7, 0x3, 0x2, [0x0, <r10=>0x0], [0x97, 0x74c83423, 0x4, 0x8], [0x6, 0x7f, 0x0, 0x9], [0x3, 0x0, 0x1, 0x1]})
ioctl$DRM_IOCTL_MODE_ADDFB2(r6, 0xc06864b8, &(0x7f0000000200)={r5, 0x1, 0x1, 0x0, 0x1, [r7, r8, 0x0, r10], [0x9, 0x7, 0x2, 0x2], [0x400, 0x367, 0x7, 0x8], [0x3e, 0x3, 0x9, 0x6]})
ioctl$DRM_IOCTL_ADD_CTX(r6, 0xc0086420, &(0x7f0000000140)={<r11=>0x0})
ioctl$DRM_IOCTL_LOCK(r3, 0x4008642a, &(0x7f0000000280)={r11, 0x26})
r12 = openat$drirender128(0xffffffffffffff9c, &(0x7f0000000300), 0x109800, 0x0)
r13 = openat$drirender128(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$DRM_IOCTL_GET_STATS(r13, 0x80f86406, 0x0)
r14 = openat$drirender128(0xffffffffffffff9c, &(0x7f0000000440), 0x840, 0x0)
ioctl$DRM_IOCTL_MODE_GETCRTC(r14, 0xc06864a1, &(0x7f0000000fc0)={0x0})
close(r12)
ioctl$DRM_IOCTL_PRIME_HANDLE_TO_FD(r14, 0xc00c642d, &(0x7f0000000000))
ioctl$DRM_IOCTL_PRIME_HANDLE_TO_FD(r13, 0xc00c642d, &(0x7f0000000040))
ioctl$DRM_IOCTL_GEM_OPEN(r12, 0xc010640b, &(0x7f0000000080))
ioctl$DRM_IOCTL_GEM_OPEN(r14, 0xc010640b, &(0x7f00000000c0))
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