8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=871ab003, *pmd=e0156003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 11433 Comm: syz-executor.1 Not tainted 6.8.0-rc6-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1097 [inline] PC is at __kmap_local_page_prot+0xc/0x74 mm/highmem.c:573 LR is at kmap_local_page include/linux/highmem-internal.h:73 [inline] LR is at copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379 pc : [<8046d124>] lr : [<807d2c68>] psr: 60000013 sp : e8cedca0 ip : e8cedcb0 fp : e8cedcac r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 980b2c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 87ec7bc0 DAC: 00000000 Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: non-paged memory Register r3 information: non-paged memory Register r4 information: slab kmalloc-1k start 980b2c00 pointer offset 0 size 1024 Register r5 information: NULL pointer Register r6 information: NULL pointer Register r7 information: NULL pointer Register r8 information: NULL pointer Register r9 information: non-slab/vmalloc memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe8cec000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xe8cec000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.1 (pid: 11433, stack limit = 0xe8cec000) Stack: (0xe8cedca0 to 0xe8cee000) dca0: e8cedce4 e8cedcb0 807d2c68 8046d124 e8cedcd4 e8cedf48 8024c7e8 980b2c00 dcc0: 980b2c00 00000000 00000000 00000000 000000ad 00000018 e8cedd34 e8cedce8 dce0: 813d93e0 807d2b7c 40000013 83206040 85108e00 85108ed0 82fc7300 85108ed8 dd00: e8cedf48 00000000 e8cedd34 82fc7300 000000ad 85108e00 840f1800 00000001 dd20: 00000000 00000000 e8cedda4 e8cedd38 815f7cf0 813d92fc 00000000 00000000 dd40: 00000000 85108ed0 85108ec0 7fffffff 82fc73a8 85108eec 82fc7534 e8cedf38 dd60: 00000000 840f1800 802a154c 00000100 00000122 acc9e8ce e8cedf38 815f7ba0 dd80: e8cedf38 83206000 00000000 00000000 00000000 e8ceddf4 e8ceddc4 e8cedda8 dda0: 815f7014 815f7bac 00000000 00000000 00000000 815f6fdc e8cedde4 e8ceddc8 ddc0: 8134c450 815f6fe8 e8cedf38 83206000 20003780 00000000 e8cedea4 e8cedde8 dde0: 8134c654 8134c40c 00000000 00000000 00000001 00000000 00000000 00000000 de00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de60: 00000000 00000000 00000000 00000000 00000000 acc9e8ce 00000000 00000000 de80: e8cedf38 20003780 00000000 83206000 840f1800 00000129 e8cedf24 e8cedea8 dea0: 8134f56c 8134c5d0 00000000 00000000 00000008 00000000 00000000 20000340 dec0: 000000ad 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 acc9e8ce df00: e8cedf24 83206000 00000000 20003780 00000000 80200288 e8cedfa4 e8cedf28 df20: 8134fd24 8134f4f0 00000000 e8cedf38 00000001 fffffff7 e8ceddf4 00000000 df40: 00000000 00000000 00000000 00000000 20000340 000000ad 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020ca34 acc9e8ce 00000000 00000000 0014c2c8 00000129 00000000 e8cedfa8 dfa0: 80200060 8134fcbc 00000000 00000000 00000003 20003780 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7eff332e 7eff332f 003d0f00 76b240fc dfe0: 76b23f08 76b23ef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d118>] (__kmap_local_page_prot) from [<807d2c68>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d118>] (__kmap_local_page_prot) from [<807d2c68>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2b70>] (copy_page_to_iter) from [<813d93e0>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000ad r8:00000000 r7:00000000 r6:00000000 r5:980b2c00 r4:980b2c00 [<813d92f0>] (sk_msg_recvmsg) from [<815f7cf0>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d92f0>] (sk_msg_recvmsg) from [<815f7cf0>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:840f1800 r6:85108e00 r5:000000ad r4:82fc7300 [<815f7ba0>] (unix_bpf_recvmsg) from [<815f7014>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2468) r10:e8ceddf4 r9:00000000 r8:00000000 r7:00000000 r6:83206000 r5:e8cedf38 r4:815f7ba0 [<815f6fdc>] (unix_dgram_recvmsg) from [<8134c450>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f6fdc>] (unix_dgram_recvmsg) from [<8134c450>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f6fdc [<8134c400>] (sock_recvmsg) from [<8134c654>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20003780 r5:83206000 r4:e8cedf38 [<8134c5c4>] (____sys_recvmsg) from [<8134f56c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:840f1800 r8:83206000 r7:00000000 r6:20003780 r5:e8cedf38 r4:00000000 [<8134f4e4>] (___sys_recvmsg) from [<8134fd24>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8134f4e4>] (___sys_recvmsg) from [<8134fd24>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8134f4e4>] (___sys_recvmsg) from [<8134fd24>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:20003780 r5:00000000 r4:83206000 [<8134fcb0>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe8cedfa8 to 0xe8cedff0) dfa0: 00000000 00000000 00000003 20003780 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7eff332e 7eff332f 003d0f00 76b240fc dfe0: 76b23f08 76b23ef8 000167e8 00050bb0 r7:00000129 r6:0014c2c8 r5:00000000 r4:00000000 Code: eaffffe8 e1a0c00d e92dd800 e24cb004 (e5901000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: eaffffe8 b 0xffffffa8 4: e1a0c00d mov ip, sp 8: e92dd800 push {fp, ip, lr, pc} c: e24cb004 sub fp, ip, #4 * 10: e5901000 ldr r1, [r0] <-- trapping instruction