================================================================== BUG: KASAN: slab-out-of-bounds in btf_name_valid_section kernel/bpf/btf.c:829 [inline] BUG: KASAN: slab-out-of-bounds in btf_datasec_check_meta+0x8ff/0x910 kernel/bpf/btf.c:4698 Read of size 1 at addr ffff888027e38078 by task syz.3.5868/21654 CPU: 0 UID: 0 PID: 21654 Comm: syz.3.5868 Not tainted 6.11.0-rc5-syzkaller-00219-g1934261d8974 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 btf_name_valid_section kernel/bpf/btf.c:829 [inline] btf_datasec_check_meta+0x8ff/0x910 kernel/bpf/btf.c:4698 btf_check_meta kernel/bpf/btf.c:5180 [inline] btf_check_all_metas kernel/bpf/btf.c:5204 [inline] btf_parse_type_sec kernel/bpf/btf.c:5340 [inline] btf_parse kernel/bpf/btf.c:5732 [inline] btf_new_fd+0x173b/0x4ed0 kernel/bpf/btf.c:7650 bpf_btf_load kernel/bpf/syscall.c:5035 [inline] __sys_bpf+0x1632/0x4a00 kernel/bpf/syscall.c:5755 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5815 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7c84379eb9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7c850cd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f7c84516130 RCX: 00007f7c84379eb9 RDX: 0000000000000020 RSI: 0000000020000c40 RDI: 0000000000000012 RBP: 00007f7c843e793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7c84516130 R15: 00007ffef5f27548 Allocated by task 21654: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_node_noprof+0x211/0x430 mm/slub.c:4164 __kvmalloc_node_noprof+0x9d/0x1a0 mm/util.c:650 btf_parse kernel/bpf/btf.c:5708 [inline] btf_new_fd+0x620/0x4ed0 kernel/bpf/btf.c:7650 bpf_btf_load kernel/bpf/syscall.c:5035 [inline] __sys_bpf+0x1632/0x4a00 kernel/bpf/syscall.c:5755 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5815 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888027e38000 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes to the right of allocated 120-byte region [ffff888027e38000, ffff888027e38078) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27e38 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff88801ac42a00 ffffea0000a21b40 dead000000000002 raw: 0000000000000000 0000000080100010 00000001fdffffff 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 831, tgid 831 (kworker/0:2), ts 12111052962, free_ts 12092131646 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3439 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 allocate_slab mm/slub.c:2484 [inline] new_slab+0x84/0x260 mm/slub.c:2537 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4184 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] drm_atomic_helper_setup_commit+0x8cc/0x15e0 drivers/gpu/drm/drm_atomic_helper.c:2318 drm_atomic_helper_commit+0xa9/0x380 drivers/gpu/drm/drm_atomic_helper.c:2023 drm_atomic_commit+0x229/0x300 drivers/gpu/drm/drm_atomic.c:1522 drm_atomic_helper_dirtyfb+0x60d/0x790 drivers/gpu/drm/drm_damage_helper.c:181 drm_fbdev_shmem_helper_fb_dirty+0x1c9/0x330 drivers/gpu/drm/drm_fbdev_shmem.c:197 drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:383 [inline] drm_fb_helper_damage_work+0x285/0x5e0 drivers/gpu/drm/drm_fb_helper.c:406 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 page last free pid 831 tgid 831 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612 vfree+0x181/0x7a0 mm/vmalloc.c:3364 delayed_vfree_work+0x56/0x70 mm/vmalloc.c:3285 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888027e37f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888027e37f80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc >ffff888027e38000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ^ ffff888027e38080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027e38100: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ==================================================================