================================================================== BUG: KASAN: use-after-free in dev_map_enqueue+0x4c/0x320 kernel/bpf/devmap.c:532 Read of size 8 at addr ffff0000cee93900 by task ksoftirqd/1/21 CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:427 kasan_report+0xd4/0x130 mm/kasan/report.c:531 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 dev_map_enqueue+0x4c/0x320 kernel/bpf/devmap.c:532 __xdp_do_redirect_frame net/core/filter.c:4320 [inline] xdp_do_redirect+0x580/0x9d8 net/core/filter.c:4368 veth_xdp_rcv_skb drivers/net/veth.c:837 [inline] veth_xdp_rcv drivers/net/veth.c:931 [inline] veth_poll+0x1b68/0x3b48 drivers/net/veth.c:967 __napi_poll+0xb4/0x3f0 net/core/dev.c:6547 napi_poll net/core/dev.c:6614 [inline] net_rx_action+0x5cc/0xd3c net/core/dev.c:6728 handle_softirqs+0x318/0xd58 kernel/softirq.c:578 run_ksoftirqd+0x6c/0x29c kernel/softirq.c:945 smpboot_thread_fn+0x4b0/0x96c kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 4506: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xd8/0x1c4 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] lsm_cred_alloc security/security.c:540 [inline] security_prepare_creds+0x54/0x140 security/security.c:1738 prepare_creds+0x41c/0x6ac kernel/cred.c:291 access_override_creds fs/open.c:376 [inline] do_faccessat+0xe0/0x790 fs/open.c:440 __do_sys_faccessat2 fs/open.c:500 [inline] __se_sys_faccessat2 fs/open.c:497 [inline] __arm64_sys_faccessat2+0x9c/0xb4 fs/open.c:497 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 4506: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:988 security_cred_free+0xb4/0xf8 security/security.c:1732 put_cred_rcu+0xe0/0x404 kernel/cred.c:115 __put_cred+0x164/0x204 kernel/cred.c:151 put_cred include/linux/cred.h:288 [inline] revert_creds+0x168/0x2a0 kernel/cred.c:608 do_faccessat+0x320/0x790 fs/open.c:487 __do_sys_faccessat2 fs/open.c:500 [inline] __se_sys_faccessat2 fs/open.c:497 [inline] __arm64_sys_faccessat2+0x9c/0xb4 fs/open.c:497 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000cee93900 which belongs to the cache kmalloc-cg-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000cee93900, ffff0000cee93980) The buggy address belongs to the physical page: page:00000000bc2788b4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ee93 memcg:ffff0000c32c7701 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc0003397dc0 dead000000000004 ffff0000c0002d80 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff0000c32c7701 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cee93800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cee93880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000cee93900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000cee93980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000cee93a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== vkms_vblank_simulate: vblank timer overrun Unable to handle kernel paging request at virtual address e08ce01a208d6061 KASAN: maybe wild-memory-access in range [0x046b00d1046b0308-0x046b00d1046b030f] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 [e08ce01a208d6061] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 21 Comm: ksoftirqd/1 Tainted: G B 6.1.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __xdp_enqueue kernel/bpf/devmap.c:481 [inline] pc : dev_map_enqueue+0x8c/0x320 kernel/bpf/devmap.c:534 lr : __xdp_enqueue kernel/bpf/devmap.c:481 [inline] lr : dev_map_enqueue+0x80/0x320 kernel/bpf/devmap.c:534 sp : ffff80001d387420 x29: ffff80001d387430 x28: ffff0000f1d96000 x27: ffff0001b3cf7f00 x26: ffff0000cee93900 x25: 0000000000000015 x24: dfff800000000000 x23: 046b00d1046b0309 x22: 0000000000000000 x21: ffff0000c9725b40 x20: ffff00011a1c4000 x19: ffff0000f1d96000 x18: 0000000000000140 x17: 0000000000000000 x16: ffff80001226d2c0 x15: 0000000000000000 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000000001 x11: 0000000000ff0100 x10: 0000000000000000 x9 : ffff80001cd729d0 x8 : 008d601a208d6061 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001d386c38 x4 : ffff800015bd5320 x3 : ffff8000086a2958 x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000 Call trace: __xdp_enqueue kernel/bpf/devmap.c:481 [inline] dev_map_enqueue+0x8c/0x320 kernel/bpf/devmap.c:534 __xdp_do_redirect_frame net/core/filter.c:4320 [inline] xdp_do_redirect+0x580/0x9d8 net/core/filter.c:4368 veth_xdp_rcv_skb drivers/net/veth.c:837 [inline] veth_xdp_rcv drivers/net/veth.c:931 [inline] veth_poll+0x1b68/0x3b48 drivers/net/veth.c:967 __napi_poll+0xb4/0x3f0 net/core/dev.c:6547 napi_poll net/core/dev.c:6614 [inline] net_rx_action+0x5cc/0xd3c net/core/dev.c:6728 handle_softirqs+0x318/0xd58 kernel/softirq.c:578 run_ksoftirqd+0x6c/0x29c kernel/softirq.c:945 smpboot_thread_fn+0x4b0/0x96c kernel/smpboot.c:164 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Code: 940b479c f94002e8 9108e117 d343fee8 (38786908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 940b479c bl 0x2d1e70 4: f94002e8 ldr x8, [x23] 8: 9108e117 add x23, x8, #0x238 c: d343fee8 lsr x8, x23, #3 * 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction