================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2386 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run1+0x14e/0x510 kernel/trace/bpf_trace.c:2430 Read of size 8 at addr ffff88801fcec070 by task syz-executor.0/14754 CPU: 1 PID: 14754 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-05233-g520fad2e3206 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __bpf_trace_run kernel/trace/bpf_trace.c:2386 [inline] bpf_trace_run1+0x14e/0x510 kernel/trace/bpf_trace.c:2430 trace_sched_process_wait include/trace/events/sched.h:347 [inline] do_wait+0x4c4/0x540 kernel/exit.c:1623 kernel_wait4+0x2a7/0x3e0 kernel/exit.c:1790 __do_sys_wait4 kernel/exit.c:1818 [inline] __se_sys_wait4 kernel/exit.c:1814 [inline] __x64_sys_wait4+0x134/0x1e0 kernel/exit.c:1814 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f6f15c7a7d7 Code: 89 7c 24 10 48 89 4c 24 18 e8 d5 a3 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 25 a4 02 00 8b 44 RSP: 002b:00007ffd6c2729a0 EFLAGS: 00000293 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007f6f15c7a7d7 RDX: 0000000040000001 RSI: 00007ffd6c272a2c RDI: 00000000ffffffff RBP: 00007ffd6c272a2c R08: 0000000000000000 R09: 00007f6f16a2a0b0 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 000000000006b3fe R14: 000000000006b3d9 R15: 0000000000000013 Allocated by task 16685: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1d9/0x360 mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] bpf_raw_tp_link_attach+0x2a0/0x6e0 kernel/bpf/syscall.c:3816 bpf_raw_tracepoint_open+0x1c2/0x240 kernel/bpf/syscall.c:3863 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5673 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 16683: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:589 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 bpf_link_release+0x3b/0x50 kernel/bpf/syscall.c:3071 __fput+0x429/0x8a0 fs/file_table.c:423 __do_sys_close fs/open.c:1557 [inline] __se_sys_close fs/open.c:1542 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1542 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff88801fcec000 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 112 bytes inside of freed 128-byte region [ffff88801fcec000, ffff88801fcec080) The buggy address belongs to the physical page: page:ffffea00007f3b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fcec ksm flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c418c0 ffffea0000b37440 dead000000000003 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 7478042432, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd1b/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmalloc_trace+0x267/0x360 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] drm_atomic_helper_setup_commit+0x683/0x1470 drivers/gpu/drm/drm_atomic_helper.c:2317 drm_atomic_helper_commit+0x62/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2022 drm_atomic_commit+0x27d/0x2d0 drivers/gpu/drm/drm_atomic.c:1514 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1051 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1154 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1370 [inline] drm_fb_helper_pan_display+0x379/0xc10 drivers/gpu/drm/drm_fb_helper.c:1430 fb_pan_display+0x3a3/0x680 drivers/video/fbdev/core/fbmem.c:191 bit_update_start+0x4d/0x1c0 drivers/video/fbdev/core/bitblit.c:390 fbcon_switch+0x10fe/0x1c90 drivers/video/fbdev/core/fbcon.c:2169 page_owner free stack trace missing Memory state around the buggy address: ffff88801fcebf00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff88801fcebf80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff88801fcec000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801fcec080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801fcec100: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ==================================================================