================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2382 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run4+0x143/0x580 kernel/trace/bpf_trace.c:2439 Read of size 8 at addr ffff88807c7ec218 by task syz-executor.4/12047 CPU: 1 PID: 12047 Comm: syz-executor.4 Not tainted 6.9.0-rc1-next-20240328-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 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:2382 [inline] bpf_trace_run4+0x143/0x580 kernel/trace/bpf_trace.c:2439 __traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x2587/0x4a50 kernel/sched/core.c:6743 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7068 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__find_get_block+0x52d/0x10d0 fs/buffer.c:1399 Code: e8 18 b5 78 ff 49 83 fe f1 0f 85 fa fe ff ff e8 09 b5 78 ff 45 31 e4 49 bd 00 00 00 00 00 fc ff df e8 b7 f0 7f ff fb 4d 85 e4 <0f> 84 47 02 00 00 e8 e8 b4 78 ff 4c 89 e7 e8 30 d4 ff ff e9 4a 02 RSP: 0018:ffffc900036f7280 EFLAGS: 00000282 RAX: 1a7a627daefa2100 RBX: 0000000000001000 RCX: ffffffff8172570a RDX: dffffc0000000000 RSI: ffffffff8bcad5c0 RDI: ffffffff8c1f77c0 RBP: ffffc900036f73b8 R08: ffffffff92f335c7 R09: 1ffffffff25e66b8 R10: dffffc0000000000 R11: fffffbfff25e66b9 R12: ffff88807d867570 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000001000 bdev_getblk+0x38/0x610 fs/buffer.c:1423 __getblk include/linux/buffer_head.h:355 [inline] sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x59f/0xf10 fs/ext4/inode.c:4369 ext4_get_inode_loc fs/ext4/inode.c:4497 [inline] ext4_reserve_inode_write+0x182/0x360 fs/ext4/inode.c:5728 __ext4_mark_inode_dirty+0x1ec/0x880 fs/ext4/inode.c:5905 add_dirent_to_buf+0x5f4/0x730 fs/ext4/namei.c:2212 ext4_add_entry+0x7c6/0x25d0 fs/ext4/namei.c:2444 ext4_add_nondir+0x8d/0x290 fs/ext4/namei.c:2792 ext4_symlink+0x920/0xb50 fs/ext4/namei.c:3433 vfs_symlink+0x137/0x2a0 fs/namei.c:4484 do_symlinkat+0x222/0x3a0 fs/namei.c:4510 __do_sys_symlinkat fs/namei.c:4526 [inline] __se_sys_symlinkat fs/namei.c:4523 [inline] __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4523 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f975d07d527 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 00 00 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:00007ffcb567c5b8 EFLAGS: 00000202 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007ffcb567c680 RCX: 00007f975d07d527 RDX: 00007f975d0ca51b RSI: 00000000ffffff9c RDI: 00007f975d0c950e RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 Allocated by task 12039: 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_noprof+0x19c/0x2b0 mm/slub.c:4079 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [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 12036: 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:579 poison_slab_object+0xe0/0x150 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:2180 [inline] slab_free mm/slub.c:4363 [inline] kfree+0x149/0x350 mm/slub.c:4484 bpf_link_release+0x3b/0x50 kernel/bpf/syscall.c:3071 __fput+0x429/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff88807c7ec200 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff88807c7ec200, ffff88807c7ec280) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c7ec flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000000 ffff8880150418c0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001ffffefff 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 4548, tgid 1977764457 (udevadm), ts 4548, free_ts 36219458560 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1487 prep_new_page mm/page_alloc.c:1495 [inline] get_page_from_freelist+0x2e8a/0x2f40 mm/page_alloc.c:3454 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2249 allocate_slab+0x5a/0x2e0 mm/slub.c:2412 new_slab mm/slub.c:2465 [inline] ___slab_alloc+0xea8/0x1430 mm/slub.c:3599 __slab_alloc+0x58/0xa0 mm/slub.c:3684 __slab_alloc_node mm/slub.c:3737 [inline] slab_alloc_node mm/slub.c:3915 [inline] kmalloc_trace_noprof+0x1d5/0x2b0 mm/slub.c:4074 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [inline] kernfs_get_open_node fs/kernfs/file.c:525 [inline] kernfs_fop_open+0x800/0xcd0 fs/kernfs/file.c:693 do_dentry_open+0x907/0x15a0 fs/open.c:955 do_open fs/namei.c:3642 [inline] path_openat+0x2860/0x3240 fs/namei.c:3799 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1432 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 page last free pid 4547 tgid 4547 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1110 [inline] free_unref_page+0xd3c/0xec0 mm/page_alloc.c:2617 discard_slab mm/slub.c:2511 [inline] __put_partials+0xeb/0x130 mm/slub.c:2980 put_cpu_partial+0x17c/0x250 mm/slub.c:3055 __slab_free+0x2ea/0x3d0 mm/slub.c:4233 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 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:3867 [inline] slab_alloc_node mm/slub.c:3927 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:3934 getname_flags+0xbd/0x4f0 fs/namei.c:139 vfs_fstatat+0x11c/0x190 fs/stat.c:303 __do_sys_newfstatat fs/stat.c:468 [inline] __se_sys_newfstatat fs/stat.c:462 [inline] __x64_sys_newfstatat+0x125/0x1b0 fs/stat.c:462 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff88807c7ec100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ffff88807c7ec180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807c7ec200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807c7ec280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807c7ec300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: e8 18 b5 78 ff call 0xff78b51d 5: 49 83 fe f1 cmp $0xfffffffffffffff1,%r14 9: 0f 85 fa fe ff ff jne 0xffffff09 f: e8 09 b5 78 ff call 0xff78b51d 14: 45 31 e4 xor %r12d,%r12d 17: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 1e: fc ff df 21: e8 b7 f0 7f ff call 0xff7ff0dd 26: fb sti 27: 4d 85 e4 test %r12,%r12 * 2a: 0f 84 47 02 00 00 je 0x277 <-- trapping instruction 30: e8 e8 b4 78 ff call 0xff78b51d 35: 4c 89 e7 mov %r12,%rdi 38: e8 30 d4 ff ff call 0xffffd46d 3d: e9 .byte 0xe9 3e: 4a rex.WX 3f: 02 .byte 0x2