8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85091003, *pmd=fe627003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 4241 Comm: syz-executor.1 Not tainted 6.10.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1103 [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 : [<80481540>] lr : [<80806998>] psr: 60000013 sp : dfd5dd40 ip : dfd5dd50 fp : dfd5dd4c r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84fdd400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85042380 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 84fdd400 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 0xdfd5c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfd5c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 4241, stack limit = 0xdfd5c000) Stack: (0xdfd5dd40 to 0xdfd5e000) dd40: dfd5dd84 dfd5dd50 80806998 80481540 dfd5dd74 dfd5dea0 8024d2c4 84fdd400 dd60: 84fdd400 00000000 00000000 00000000 0000000d 00000018 dfd5ddd4 dfd5dd88 dd80: 8146162c 808068ac 00000001 40000013 844a1e00 844a1ee0 83bf3300 844a1ee8 dda0: dfd5dea0 00000000 00000001 83bf3300 0000000d 844a1e00 840f5400 00000001 ddc0: 00000000 00000000 dfd5de44 dfd5ddd8 81688d74 81461548 00000000 00000000 dde0: 00000000 844a1ee0 844a1ed0 7fffffff 83bf3388 844a1efc 83bf3534 dfd5de90 de00: 00000000 840f5400 802a4894 00000100 00000122 eecc81b0 dfd5de90 81688c24 de20: dfd5de90 848a8f00 00000000 00000000 00000000 0000000d dfd5de64 dfd5de48 de40: 81687abc 81688c30 00000000 00000000 00000000 81687a84 dfd5de84 dfd5de68 de60: 813d0894 81687a90 00000000 00000000 848a8f00 dfd5dedc dfd5df8c dfd5de88 de80: 813d3304 813d0850 fffffff7 00000001 00000000 00000000 00000000 00000000 dea0: 00000000 00000000 20000240 0000000d 00000001 00000000 00000000 00000000 dec0: 00000000 00000000 00000000 00000000 00000000 00000000 dfd5df04 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 df00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 df20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 df40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 eecc81b0 df60: 8261c90c 00000000 00000000 001542dc 00000124 8020029c 840f5400 00000124 df80: dfd5dfa4 dfd5df90 813d33a0 813d3248 00000000 00000000 00000000 dfd5dfa8 dfa0: 80200060 813d3390 00000000 00000000 00000005 20000240 0000000d 00000000 dfc0: 00000000 00000000 001542dc 00000124 7edcd32e 7edcd32f 003d0f00 76bce0fc dfe0: 76bcdf08 76bcdef8 00016ea8 00051620 60000010 00000005 00000000 00000000 Call trace: [<80481534>] (__kmap_local_page_prot) from [<80806998>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80481534>] (__kmap_local_page_prot) from [<80806998>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<808068a0>] (copy_page_to_iter) from [<8146162c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:0000000d r8:00000000 r7:00000000 r6:00000000 r5:84fdd400 r4:84fdd400 [<8146153c>] (sk_msg_recvmsg) from [<81688d74>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8146153c>] (sk_msg_recvmsg) from [<81688d74>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:840f5400 r6:844a1e00 r5:0000000d r4:83bf3300 [<81688c24>] (unix_bpf_recvmsg) from [<81687abc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2489) r10:0000000d r9:00000000 r8:00000000 r7:00000000 r6:848a8f00 r5:dfd5de90 r4:81688c24 [<81687a84>] (unix_dgram_recvmsg) from [<813d0894>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81687a84>] (unix_dgram_recvmsg) from [<813d0894>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81687a84 [<813d0844>] (sock_recvmsg) from [<813d3304>] (__sys_recvfrom+0xc8/0x148 net/socket.c:2243) r7:dfd5dedc r6:848a8f00 r5:00000000 r4:00000000 [<813d323c>] (__sys_recvfrom) from [<813d33a0>] (__do_sys_recvfrom net/socket.c:2261 [inline]) [<813d323c>] (__sys_recvfrom) from [<813d33a0>] (sys_recvfrom+0x1c/0x24 net/socket.c:2257) r10:00000124 r9:840f5400 r8:8020029c r7:00000124 r6:001542dc r5:00000000 r4:00000000 [<813d3384>] (sys_recvfrom) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd5dfa8 to 0xdfd5dff0) dfa0: 00000000 00000000 00000005 20000240 0000000d 00000000 dfc0: 00000000 00000000 001542dc 00000124 7edcd32e 7edcd32f 003d0f00 76bce0fc dfe0: 76bcdf08 76bcdef8 00016ea8 00051620 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