================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2376 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run1+0xcb/0x510 kernel/trace/bpf_trace.c:2430 Read of size 8 at addr ffff88802aca1918 by task syz-executor.3/13665 CPU: 1 PID: 13665 Comm: syz-executor.3 Not tainted 6.8.0-syzkaller-05238-g61df575632d6 #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:2376 [inline] bpf_trace_run1+0xcb/0x510 kernel/trace/bpf_trace.c:2430 __traceiter_block_plug+0x71/0xc0 include/trace/events/block.h:407 trace_block_plug+0x180/0x1f0 include/trace/events/block.h:407 blk_add_rq_to_plug+0x1b9/0x480 block/blk-mq.c:1301 blk_mq_submit_bio+0x14ae/0x1fd0 block/blk-mq.c:3014 __submit_bio+0x23e/0x2f0 block/blk-core.c:619 __submit_bio_noacct_mq block/blk-core.c:698 [inline] submit_bio_noacct_nocheck+0xacb/0xd90 block/blk-core.c:727 ext4_io_submit+0xda/0x140 fs/ext4/page-io.c:378 ext4_do_writepages+0x2d79/0x3ca0 fs/ext4/inode.c:2699 ext4_writepages+0x204/0x3e0 fs/ext4/inode.c:2768 do_writepages+0x3a4/0x670 mm/page-writeback.c:2553 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] __filemap_fdatawrite mm/filemap.c:427 [inline] filemap_flush+0x11e/0x180 mm/filemap.c:454 ext4_release_file+0x81/0x300 fs/ext4/file.c:169 __fput+0x429/0x8a0 fs/file_table.c:423 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x176e/0x1850 kernel/signal.c:2907 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x79/0x270 kernel/entry/common.c:225 exc_page_fault+0x585/0x890 arch/x86/mm/fault.c:1566 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x1072b593 Code: Unable to access opcode bytes at 0x1072b569. RSP: 002b:00000000200003f8 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f1df73abf80 RCX: 00007f1df727dda9 RDX: 0000000020000400 RSI: 00000000200003f0 RDI: 0000000000000000 RBP: 00007f1df72ca47a R08: 0000000020000480 R09: 0000000020000480 R10: 0000000020000440 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f1df73abf80 R15: 00007ffe263d9d88 Allocated by task 13774: 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 13774: 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 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x176e/0x1850 kernel/signal.c:2907 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:212 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff88802aca1900 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff88802aca1900, ffff88802aca1980) The buggy address belongs to the physical page: page:ffffea0000ab2840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2aca1 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c418c0 dead000000000100 dead000000000122 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4522, tgid 4522 (udevd), ts 115146028333, free_ts 115141407097 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] kernfs_get_open_node fs/kernfs/file.c:523 [inline] kernfs_fop_open+0x803/0xcd0 fs/kernfs/file.c:691 do_dentry_open+0x907/0x15a0 fs/open.c:956 do_open fs/namei.c:3643 [inline] path_openat+0x2860/0x3240 fs/namei.c:3800 do_filp_open+0x235/0x490 fs/namei.c:3827 do_sys_openat2+0x13e/0x1d0 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1433 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 page last free pid 5106 tgid 5106 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 __slab_free+0x349/0x410 mm/slub.c:4211 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x172/0x350 mm/slub.c:3867 getname_flags+0xbd/0x4f0 fs/namei.c:140 do_sys_openat2+0xd2/0x1d0 fs/open.c:1401 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1433 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff88802aca1800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ffff88802aca1880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802aca1900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802aca1980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802aca1a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ==================================================================