8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85287003, *pmd=fe5cd003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 5105 Comm: syz-executor.0 Not tainted 6.9.0-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 : [<8047a5f4>] lr : [<807ea4e4>] psr: 60000013 sp : dfaadca0 ip : dfaadcb0 fp : dfaadcac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84e69400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85161840 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 84e69400 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 0xdfaac000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfaac000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.0 (pid: 5105, stack limit = 0xdfaac000) Stack: (0xdfaadca0 to 0xdfaae000) dca0: dfaadce4 dfaadcb0 807ea4e4 8047a5f4 dfaadcd4 dfaadf48 8024cc38 84e69400 dcc0: 84e69400 00000000 00000001 00000000 000000c7 00000018 dfaadd34 dfaadce8 dce0: 81434784 807ea3f8 00000000 84c72b70 8420ea00 8420ead0 84d0fc00 8420ead8 dd00: dfaadf48 00000002 00000002 84d0fc00 000000c7 8420ea00 84c72400 00000000 dd20: 00000102 00000000 dfaadda4 dfaadd38 816576cc 814346a0 00000102 8027b2fc dd40: 8165757c 20000013 dfaaddc4 dfaadd58 84d0fc88 8420eaec 84d0fe34 dfaadf38 dd60: 000000c7 00000102 8165757c dfaadf38 83209180 a38627f3 00000000 8165757c dd80: dfaadf38 83209180 00000102 00000000 00000102 dfaaddf4 dfaaddc4 dfaadda8 dda0: 81656748 81657588 00000000 00000102 00000000 81656710 dfaadde4 dfaaddc8 ddc0: 813a3cf4 8165671c dfaadf38 83209180 200004c0 00000000 dfaadea4 dfaadde8 dde0: 813a3ef4 813a3cb0 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 a38627f3 00000000 00000000 de80: dfaadf38 200004c0 00000102 83209180 84c72400 00000129 dfaadf24 dfaadea8 dea0: 813a6e38 813a3e70 00000102 00000000 00000008 00000000 00000000 200002c0 dec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 a38627f3 df00: dfaadf24 83209180 00000000 200004c0 00000102 80200288 dfaadfa4 dfaadf28 df20: 813a75b4 813a6dbc 00000000 dfaadf38 00000001 fffffff7 dfaaddf4 00000000 df40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020c60c a38627f3 00000000 00000000 0014c2c8 00000129 00000000 dfaadfa8 dfa0: 80200060 813a754c 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7ebc932e 7ebc932f 003d0f00 76bac0fc dfe0: 76babf08 76babef8 00016bb0 00050c70 60000010 00000003 00000000 00000000 Call trace: [<8047a5e8>] (__kmap_local_page_prot) from [<807ea4e4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a5e8>] (__kmap_local_page_prot) from [<807ea4e4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807ea3ec>] (copy_page_to_iter) from [<81434784>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:84e69400 r4:84e69400 [<81434694>] (sk_msg_recvmsg) from [<816576cc>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81434694>] (sk_msg_recvmsg) from [<816576cc>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:84c72400 r6:8420ea00 r5:000000c7 r4:84d0fc00 [<8165757c>] (unix_bpf_recvmsg) from [<81656748>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfaaddf4 r9:00000102 r8:00000000 r7:00000102 r6:83209180 r5:dfaadf38 r4:8165757c [<81656710>] (unix_dgram_recvmsg) from [<813a3cf4>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81656710>] (unix_dgram_recvmsg) from [<813a3cf4>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81656710 [<813a3ca4>] (sock_recvmsg) from [<813a3ef4>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:83209180 r4:dfaadf38 [<813a3e64>] (____sys_recvmsg) from [<813a6e38>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:84c72400 r8:83209180 r7:00000102 r6:200004c0 r5:dfaadf38 r4:00000000 [<813a6db0>] (___sys_recvmsg) from [<813a75b4>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a6db0>] (___sys_recvmsg) from [<813a75b4>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a6db0>] (___sys_recvmsg) from [<813a75b4>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000102 r6:200004c0 r5:00000000 r4:83209180 [<813a7540>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfaadfa8 to 0xdfaadff0) dfa0: 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7ebc932e 7ebc932f 003d0f00 76bac0fc dfe0: 76babf08 76babef8 00016bb0 00050c70 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