usercopy: Kernel memory exposure attempt detected from SLAB object 'kmalloc-4194304' (offset 4194300, size 1050)! ------------[ cut here ]------------ ------------[ cut here ]------------ kernel BUG at mm/slab.c:4421! kernel BUG at mm/usercopy.c:100! invalid opcode: 0000 [#1] SMP KASAN CPU: 0 PID: 10252 Comm: syz-executor4 Not tainted 4.18.0-rc3+ #58 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__check_heap_object+0xa7/0xb5 mm/slab.c:4446 Code: 48 c7 c7 e0 8b c0 88 e8 87 7a 08 00 5d c3 41 8b 91 04 01 00 00 48 29 c7 48 39 d7 77 be 48 01 d0 48 29 c8 48 39 f0 72 b3 5d c3 <0f> 0b 48 c7 c7 e0 8b c0 88 e8 6d 81 08 00 44 89 e1 4c 8d 45 c4 48 RSP: 0018:ffff88019e1afa10 EFLAGS: 00010246 RAX: 0000000000000001 RBX: 1ffff10033c35f49 RCX: 0000000000000015 RDX: ffff88019a000080 RSI: 000000000000041a RDI: ffff88019a3ffffc RBP: ffff88019e1afa10 R08: ffff8801b1cda040 R09: ffff8801da802c80 R10: 00000000003fdf84 R11: 0000000000000001 R12: ffff88019a3ffffc R13: 000000000000041a R14: 0000000000000001 R15: ffffea0006680000 FS: 00007fa1f3d4e700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001b4cd0000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: check_heap_object mm/usercopy.c:236 [inline] __check_object_size+0x4db/0x5f2 mm/usercopy.c:259 check_object_size include/linux/thread_info.h:119 [inline] check_copy_size include/linux/thread_info.h:150 [inline] copy_to_user include/linux/uaccess.h:154 [inline] bpf_test_finish.isra.7+0xd9/0x1f0 net/bpf/test_run.c:59 bpf_prog_test_run_skb+0x7d7/0xa30 net/bpf/test_run.c:144 bpf_prog_test_run+0x130/0x1a0 kernel/bpf/syscall.c:1686 __do_sys_bpf kernel/bpf/syscall.c:2323 [inline] __se_sys_bpf kernel/bpf/syscall.c:2267 [inline] __x64_sys_bpf+0x3d8/0x510 kernel/bpf/syscall.c:2267 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa1f3d4dc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fa1f3d4e6d4 RCX: 0000000000455ab9 RDX: 0000000000000028 RSI: 0000000020000100 RDI: 000000000000000a RBP: 000000000072bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bb71f R14: 00000000004c8b00 R15: 0000000000000001 Modules linked in: Dumping ftrace buffer: --------------------------------- syz-exec-10250 0...3 78871128us : 0: }D syz-exec-10250 0...3 78876264us : 0: }D --------------------------------- invalid opcode: 0000 [#2] SMP KASAN ---[ end trace 55e0adcb28b4d0ec ]--- CPU: 1 PID: 10217 Comm: syz-executor4 Tainted: G D 4.18.0-rc3+ #58 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:usercopy_abort+0xbb/0xbd mm/usercopy.c:88 Code: RIP: 0010:__check_heap_object+0xa7/0xb5 mm/slab.c:4446 c0 e8 57 6c b9 ff Code: ff 75 c8 48 8b 55 c0 4d 89 48 f9 ff 75 d0 4d 89 e8 c7 48 89 d9 4c 89 e6 c7 41 56 48 c7 c7 e0 a0 41 f3 87 e8 b7 8b 63 a0 ff <0f> 0b e8 c0 2c 6c b9 ff e8 27 88 7e f7 ff 4c 89 e1 e8 8b 95 14 ff ff ff 87 31 RSP: 0018:ffff8801973379a8 EFLAGS: 00010286 RAX: 0000000000000071 RBX: ffffffff88c08be0 RCX: ffffc90006a4a000 RDX: 0000000000000000 RSI: ffffffff81631851 RDI: 0000000000000001 7a RBP: ffff880197337a00 R08: ffff8801bcbb4080 R09: ffffed003b5e4fc0 R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffffffff87f34080 R13: ffffffff87f33f40 R14: ffffffff87f33f00 R15: ffffffff88c04796 08 FS: 00007fa1f3d6f700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe3e2aaff8 CR3: 00000001b4cd0000 CR4: 00000000001406e0 00 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 5d Call Trace: __check_heap_object+0xb5/0xb5 mm/slab.c:4445 check_heap_object mm/usercopy.c:236 [inline] __check_object_size+0x4db/0x5f2 mm/usercopy.c:259 c3 41 check_object_size include/linux/thread_info.h:119 [inline] check_copy_size include/linux/thread_info.h:150 [inline] copy_to_user include/linux/uaccess.h:154 [inline] bpf_test_finish.isra.7+0xd9/0x1f0 net/bpf/test_run.c:59 8b 91 bpf_prog_test_run_skb+0x7d7/0xa30 net/bpf/test_run.c:144 04 01 bpf_prog_test_run+0x130/0x1a0 kernel/bpf/syscall.c:1686 00 __do_sys_bpf kernel/bpf/syscall.c:2323 [inline] __se_sys_bpf kernel/bpf/syscall.c:2267 [inline] __x64_sys_bpf+0x3d8/0x510 kernel/bpf/syscall.c:2267 00 48 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 29 c7 48 39 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 d7 Code: 1d ba fb ff 77 c3 66 2e 0f 1f 84 be 00 00 00 00 00 66 48 90 48 89 f8 48 89 f7 48 89 d6 48 89 01 ca 4d 89 c2 4d 89 d0 c8 4c 8b 4c 24 08 48 0f 05 <48> 3d 01 f0 29 ff ff 0f 83 eb b9 c8 fb ff c3 66 2e 0f 48 1f 84 00 00 00 00 39 RSP: 002b:00007fa1f3d6ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fa1f3d6f6d4 RCX: 0000000000455ab9 RDX: 0000000000000028 RSI: 0000000020000100 RDI: 000000000000000a f0 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bb71f R14: 00000000004c8b00 R15: 0000000000000000 Modules linked in: 72 Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace 55e0adcb28b4d0ed ]--- b3 RIP: 0010:__check_heap_object+0xa7/0xb5 mm/slab.c:4446 Code: 5d 48 c7 c3 c7 e0 <0f> 8b c0 0b 88 e8 48 87 7a c7 08 00 c7 5d c3 e0 41 8b 8b c0 91 04 88 e8 01 00 6d 00 81 08 48 00 44 29 c7 89 e1 4c 8d 45 c4 48 RSP: 0018:ffff88019e1afa10 EFLAGS: 00010246 RAX: 0000000000000001 RBX: 1ffff10033c35f49 RCX: 0000000000000015 RDX: ffff88019a000080 RSI: 000000000000041a RDI: ffff88019a3ffffc RBP: ffff88019e1afa10 R08: ffff8801b1cda040 R09: ffff8801da802c80 R10: 00000000003fdf84 R11: 0000000000000001 R12: ffff88019a3ffffc R13: 000000000000041a R14: 0000000000000001 R15: ffffea0006680000 FS: 00007fa1f3d4e700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001b4cd0000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600