8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=852fc003, *pmd=fe102003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 9622 Comm: syz-executor.0 Not tainted 6.9.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1100 [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:360 pc : [<80479ea8>] lr : [<807e997c>] psr: 60000013 sp : dfffdca0 ip : dfffdcb0 fp : dfffdcac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84616000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84cf9000 DAC: fffffffd 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 84616000 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 0xdfffc000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xdfffc000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.0 (pid: 9622, stack limit = 0xdfffc000) Stack: (0xdfffdca0 to 0xdfffe000) dca0: dfffdce4 dfffdcb0 807e997c 80479ea8 dfffdcd4 dfffdf48 8024c880 84616000 dcc0: 84616000 00000000 00000000 00000000 000000c7 00000018 dfffdd34 dfffdce8 dce0: 814333f4 807e9890 00000000 955513e8 841ce000 841ce0d0 84cb0000 841ce0d8 dd00: dfffdf48 00000000 dfffdd8c 84cb0000 000000c7 841ce000 85085400 00000000 dd20: 00000000 00000000 dfffdda4 dfffdd38 816560a8 81433310 00000000 00000000 dd40: 00000000 00000000 00000000 00000000 84cb0088 841ce0ec 84cb0234 dfffdf38 dd60: 00000000 955513e8 818c33d0 821a9848 00000000 955513e8 dfffdf38 81655f58 dd80: dfffdf38 84857b80 00000000 00000000 00000000 dfffddf4 dfffddc4 dfffdda8 dda0: 81655124 81655f64 00000000 00000000 00000000 816550ec dfffdde4 dfffddc8 ddc0: 813a29d4 816550f8 dfffdf38 84857b80 200004c0 00000000 dfffdea4 dfffdde8 dde0: 813a2bd4 813a2990 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 955513e8 00000000 00000000 de80: dfffdf38 200004c0 00000000 84857b80 85085400 00000129 dfffdf24 dfffdea8 dea0: 813a5b18 813a2b50 00000000 00000000 00000008 00000000 00000000 200002c0 dec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 955513e8 df00: dfffdf24 84857b80 00000000 200004c0 00000000 80200288 dfffdfa4 dfffdf28 df20: 813a6294 813a5a9c 00000000 dfffdf38 00000001 fffffff7 dfffddf4 00000000 df40: 00000000 00000000 00000000 00000000 200002c0 000000c7 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020ca6c 955513e8 00000000 00000000 0014c2c8 00000129 00000000 dfffdfa8 dfa0: 80200060 813a622c 00000000 00000000 00000003 200004c0 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7e86732e 7e86732f 003d0f00 76b570fc dfe0: 76b56f08 76b56ef8 00016aa0 00050bd0 60000010 00000003 00000000 00000000 Call trace: [<80479e9c>] (__kmap_local_page_prot) from [<807e997c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479e9c>] (__kmap_local_page_prot) from [<807e997c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9884>] (copy_page_to_iter) from [<814333f4>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000000 r6:00000000 r5:84616000 r4:84616000 [<81433304>] (sk_msg_recvmsg) from [<816560a8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81433304>] (sk_msg_recvmsg) from [<816560a8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:85085400 r6:841ce000 r5:000000c7 r4:84cb0000 [<81655f58>] (unix_bpf_recvmsg) from [<81655124>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfffddf4 r9:00000000 r8:00000000 r7:00000000 r6:84857b80 r5:dfffdf38 r4:81655f58 [<816550ec>] (unix_dgram_recvmsg) from [<813a29d4>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<816550ec>] (unix_dgram_recvmsg) from [<813a29d4>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:816550ec [<813a2984>] (sock_recvmsg) from [<813a2bd4>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:84857b80 r4:dfffdf38 [<813a2b44>] (____sys_recvmsg) from [<813a5b18>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:85085400 r8:84857b80 r7:00000000 r6:200004c0 r5:dfffdf38 r4:00000000 [<813a5a90>] (___sys_recvmsg) from [<813a6294>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a5a90>] (___sys_recvmsg) from [<813a6294>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a5a90>] (___sys_recvmsg) from [<813a6294>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:200004c0 r5:00000000 r4:84857b80 [<813a6220>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfffdfa8 to 0xdfffdff0) dfa0: 00000000 00000000 00000003 200004c0 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7e86732e 7e86732f 003d0f00 76b570fc dfe0: 76b56f08 76b56ef8 00016aa0 00050bd0 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