8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8502e003, *pmd=fe717003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 3725 Comm: syz-executor.1 Not tainted 6.8.0-rc4-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 : [<8046d0fc>] lr : [<807d2890>] psr: 60000113 sp : e06ddca0 ip : e06ddcb0 fp : e06ddcac r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 846eb000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84fb7c40 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 846eb000 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 0xe06dc000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xe06dc000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.1 (pid: 3725, stack limit = 0xe06dc000) Stack: (0xe06ddca0 to 0xe06de000) dca0: e06ddce4 e06ddcb0 807d2890 8046d0fc e06ddcd4 e06ddf48 8024c7e8 846eb000 dcc0: 846eb000 00000000 00000000 00000000 00000080 00000018 e06ddd34 e06ddce8 dce0: 813d8354 807d27a4 40000113 833db1c0 8473be00 8473bed0 83e16700 8473bed8 dd00: e06ddf48 00000000 e06ddd34 83e16700 00000080 8473be00 836db000 00000001 dd20: 00000000 00000000 e06ddda4 e06ddd38 815f6a8c 813d8270 00000000 00000000 dd40: 00000000 8473bed0 8473bec0 7fffffff 83e167a8 8473beec 83e16934 e06ddf38 dd60: 00000000 836db000 802a154c 00000100 00000122 dacd867f e06ddf38 815f693c dd80: e06ddf38 833db180 00000000 00000000 00000000 e06dddf4 e06dddc4 e06ddda8 dda0: 815f5d98 815f6948 00000000 00000000 00000000 815f5d60 e06ddde4 e06dddc8 ddc0: 8134b408 815f5d6c e06ddf38 833db180 20000800 00000000 e06ddea4 e06ddde8 dde0: 8134b60c 8134b3c4 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 dacd867f 00000000 00000000 de80: e06ddf38 20000800 00000000 833db180 836db000 00000129 e06ddf24 e06ddea8 dea0: 8134e524 8134b588 00000000 00000000 00000008 00000000 00000000 200003c0 dec0: 00000080 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dacd867f df00: e06ddf24 833db180 00000000 20000800 00000000 80200288 e06ddfa4 e06ddf28 df20: 8134ecdc 8134e4a8 00000000 e06ddf38 00000001 fffffff7 e06dddf4 00000000 df40: 00000000 00000000 00000000 00000000 200003c0 00000080 00000001 00000000 df60: 00000000 00000001 00000000 00000002 00000000 00000000 00000000 00000000 df80: 8020ca34 dacd867f 00000000 00000000 0014c2c8 00000129 00000000 e06ddfa8 dfa0: 80200060 8134ec74 00000000 00000000 00000003 20000800 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7ebbd32e 7ebbd32f 003d0f00 76be80fc dfe0: 76be7f08 76be7ef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d0f0>] (__kmap_local_page_prot) from [<807d2890>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d0f0>] (__kmap_local_page_prot) from [<807d2890>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2798>] (copy_page_to_iter) from [<813d8354>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000080 r8:00000000 r7:00000000 r6:00000000 r5:846eb000 r4:846eb000 [<813d8264>] (sk_msg_recvmsg) from [<815f6a8c>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d8264>] (sk_msg_recvmsg) from [<815f6a8c>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:836db000 r6:8473be00 r5:00000080 r4:83e16700 [<815f693c>] (unix_bpf_recvmsg) from [<815f5d98>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2481) r10:e06dddf4 r9:00000000 r8:00000000 r7:00000000 r6:833db180 r5:e06ddf38 r4:815f693c [<815f5d60>] (unix_dgram_recvmsg) from [<8134b408>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f5d60>] (unix_dgram_recvmsg) from [<8134b408>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f5d60 [<8134b3b8>] (sock_recvmsg) from [<8134b60c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000800 r5:833db180 r4:e06ddf38 [<8134b57c>] (____sys_recvmsg) from [<8134e524>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:836db000 r8:833db180 r7:00000000 r6:20000800 r5:e06ddf38 r4:00000000 [<8134e49c>] (___sys_recvmsg) from [<8134ecdc>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8134e49c>] (___sys_recvmsg) from [<8134ecdc>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8134e49c>] (___sys_recvmsg) from [<8134ecdc>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:20000800 r5:00000000 r4:833db180 [<8134ec68>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe06ddfa8 to 0xe06ddff0) dfa0: 00000000 00000000 00000003 20000800 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7ebbd32e 7ebbd32f 003d0f00 76be80fc dfe0: 76be7f08 76be7ef8 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