8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85246003, *pmd=f2c84003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 5049 Comm: syz-executor.1 Not tainted 6.9.0-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 : [<80483238>] lr : [<80809914>] psr: 60000013 sp : dfeadca0 ip : dfeadcb0 fp : dfeadcac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 851cdc00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85614580 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 851cdc00 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 0xdfeac000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfeac000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 5049, stack limit = 0xdfeac000) Stack: (0xdfeadca0 to 0xdfeae000) dca0: dfeadce4 dfeadcb0 80809914 80483238 dfeadcd4 dfeadf48 8024d45c 851cdc00 dcc0: 851cdc00 00000000 00000001 00000000 000000c7 00000018 dfeadd34 dfeadce8 dce0: 8146bd7c 80809828 00000000 a731dad9 851d2c00 851d2ce0 85340000 851d2ce8 dd00: dfeadf48 00000002 dfeadd8c 85340000 000000c7 851d2c00 84548000 00000000 dd20: 00000102 00000000 dfeadda4 dfeadd38 8169339c 8146bc98 00000102 00000000 dd40: 00000000 00000000 00000000 00000000 85340088 851d2cfc 85340234 dfeadf38 dd60: 00000000 a731dad9 819047ac 821cd998 00000102 a731dad9 dfeadf38 8169324c dd80: dfeadf38 848cdb80 00000102 00000000 00000102 dfeaddf4 dfeaddc4 dfeadda8 dda0: 81692130 81693258 00000000 00000102 00000000 816920f8 dfeadde4 dfeaddc8 ddc0: 813d9b00 81692104 dfeadf38 200004c0 848cdb80 00000000 dfeadea4 dfeadde8 dde0: 813d9d04 813d9abc 00000001 00000000 dfeade34 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 a731dad9 00000000 00000000 de80: dfeadf38 200004c0 00000102 848cdb80 84548000 00000129 dfeadf24 dfeadea8 dea0: 813dcde8 813d9c80 00000102 00000000 ffffffff 00000000 00000000 200002c0 dec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 a731dad9 df00: dfeadf24 848cdb80 00000000 200004c0 00000102 8020029c dfeadfa4 dfeadf28 df20: 813dd5c8 813dcd6c 00000000 dfeadf38 00000001 fffffff7 dfeaddf4 00000000 df40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020c940 a731dad9 00000000 00000000 0014c2c8 00000129 00000000 dfeadfa8 dfa0: 80200060 813dd560 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7e9a232e 7e9a232f 003d0f00 76bc60fc dfe0: 76bc5f08 76bc5ef8 00016d28 00051560 60000010 00000003 00000000 00000000 Call trace: [<8048322c>] (__kmap_local_page_prot) from [<80809914>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8048322c>] (__kmap_local_page_prot) from [<80809914>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<8080981c>] (copy_page_to_iter) from [<8146bd7c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:851cdc00 r4:851cdc00 [<8146bc8c>] (sk_msg_recvmsg) from [<8169339c>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8146bc8c>] (sk_msg_recvmsg) from [<8169339c>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:84548000 r6:851d2c00 r5:000000c7 r4:85340000 [<8169324c>] (unix_bpf_recvmsg) from [<81692130>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2482) r10:dfeaddf4 r9:00000102 r8:00000000 r7:00000102 r6:848cdb80 r5:dfeadf38 r4:8169324c [<816920f8>] (unix_dgram_recvmsg) from [<813d9b00>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<816920f8>] (unix_dgram_recvmsg) from [<813d9b00>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:816920f8 [<813d9ab0>] (sock_recvmsg) from [<813d9d04>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:848cdb80 r5:200004c0 r4:dfeadf38 [<813d9c74>] (____sys_recvmsg) from [<813dcde8>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:84548000 r8:848cdb80 r7:00000102 r6:200004c0 r5:dfeadf38 r4:00000000 [<813dcd60>] (___sys_recvmsg) from [<813dd5c8>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813dcd60>] (___sys_recvmsg) from [<813dd5c8>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813dcd60>] (___sys_recvmsg) from [<813dd5c8>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:848cdb80 [<813dd554>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfeadfa8 to 0xdfeadff0) dfa0: 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7e9a232e 7e9a232f 003d0f00 76bc60fc dfe0: 76bc5f08 76bc5ef8 00016d28 00051560 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