8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84521003, *pmd=fe670003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 4444 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 : [<804832b0>] lr : [<8080b33c>] psr: 60000113 sp : dfa4dca0 ip : dfa4dcb0 fp : dfa4dcac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84de2000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84e36b40 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 84de2000 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 0xdfa4c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfa4c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 4444, stack limit = 0xdfa4c000) Stack: (0xdfa4dca0 to 0xdfa4e000) dca0: dfa4dce4 dfa4dcb0 8080b33c 804832b0 dfa4dcd4 dfa4df48 8024d45c 84de2000 dcc0: 84de2000 00000000 00000000 00000000 000000b3 00000018 dfa4dd34 dfa4dce8 dce0: 8146c74c 8080b250 40000113 848c7bc0 84683a00 84683ae0 84122700 84683ae8 dd00: dfa4df48 00000000 dfa4dd34 84122700 000000b3 84683a00 84740000 00000001 dd20: 00000000 00000000 dfa4dda4 dfa4dd38 81693d6c 8146c668 00000000 00000000 dd40: 00000000 84683ae0 84683ad0 7fffffff 84122788 84683afc 84122934 dfa4df38 dd60: 00000000 84740000 802a5054 00000100 00000122 2befc2f8 dfa4df38 81693c1c dd80: dfa4df38 848c7b80 00000000 00000000 00000000 dfa4ddf4 dfa4ddc4 dfa4dda8 dda0: 81692b00 81693c28 00000000 00000000 00000000 81692ac8 dfa4dde4 dfa4ddc8 ddc0: 813da510 81692ad4 dfa4df38 200004c0 848c7b80 00000000 dfa4dea4 dfa4dde8 dde0: 813da714 813da4cc 00000001 00000000 dfa4de34 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 2befc2f8 05000000 00000000 de80: dfa4df38 200004c0 00000000 848c7b80 84740000 00000129 dfa4df24 dfa4dea8 dea0: 813dd7f8 813da690 00000000 00000000 80287b04 00000000 00000000 200006c0 dec0: 000000b3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 2befc2f8 df00: dfa4df24 848c7b80 00000000 200004c0 00000000 8020029c dfa4dfa4 dfa4df28 df20: 813ddfd8 813dd77c 00000000 dfa4df38 00000001 fffffff7 dfa4ddf4 00000000 df40: 00000000 00000000 00000000 00000000 200006c0 000000b3 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020c940 2befc2f8 00000000 00000000 0014c2c8 00000129 00000000 dfa4dfa8 dfa0: 80200060 813ddf70 00000000 00000000 00000003 200004c0 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7ef6732e 7ef6732f 003d0f00 76be30fc dfe0: 76be2f08 76be2ef8 00016d28 00051560 60000010 00000003 00000000 00000000 Call trace: [<804832a4>] (__kmap_local_page_prot) from [<8080b33c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<804832a4>] (__kmap_local_page_prot) from [<8080b33c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<8080b244>] (copy_page_to_iter) from [<8146c74c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000b3 r8:00000000 r7:00000000 r6:00000000 r5:84de2000 r4:84de2000 [<8146c65c>] (sk_msg_recvmsg) from [<81693d6c>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8146c65c>] (sk_msg_recvmsg) from [<81693d6c>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:84740000 r6:84683a00 r5:000000b3 r4:84122700 [<81693c1c>] (unix_bpf_recvmsg) from [<81692b00>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2482) r10:dfa4ddf4 r9:00000000 r8:00000000 r7:00000000 r6:848c7b80 r5:dfa4df38 r4:81693c1c [<81692ac8>] (unix_dgram_recvmsg) from [<813da510>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81692ac8>] (unix_dgram_recvmsg) from [<813da510>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81692ac8 [<813da4c0>] (sock_recvmsg) from [<813da714>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:848c7b80 r5:200004c0 r4:dfa4df38 [<813da684>] (____sys_recvmsg) from [<813dd7f8>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:84740000 r8:848c7b80 r7:00000000 r6:200004c0 r5:dfa4df38 r4:00000000 [<813dd770>] (___sys_recvmsg) from [<813ddfd8>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813dd770>] (___sys_recvmsg) from [<813ddfd8>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813dd770>] (___sys_recvmsg) from [<813ddfd8>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:848c7b80 [<813ddf64>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa4dfa8 to 0xdfa4dff0) dfa0: 00000000 00000000 00000003 200004c0 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7ef6732e 7ef6732f 003d0f00 76be30fc dfe0: 76be2f08 76be2ef8 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