8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84ccb003, *pmd=fe600003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 4693 Comm: syz.0.176 Not tainted 6.10.0-rc5-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 : [<80480f08>] lr : [<8080681c>] psr: 60000013 sp : dfa4dca0 ip : dfa4dcb0 fp : dfa4dcac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8428f400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8447b600 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 8428f400 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.0.176 (pid: 4693, stack limit = 0xdfa4c000) Stack: (0xdfa4dca0 to 0xdfa4e000) dca0: dfa4dce4 dfa4dcb0 8080681c 80480f08 dfa4dcd4 dfa4df48 8024d2c4 8428f400 dcc0: 8428f400 00000000 00000001 00000000 000000c7 00000018 dfa4dd34 dfa4dce8 dce0: 81461d18 80806730 00000000 bb43af24 84e5b200 84e5b2e0 82f73300 84e5b2e8 dd00: dfa4df48 00000002 dfa4dd8c 82f73300 000000c7 84e5b200 836b3000 00000000 dd20: 00000102 00000000 dfa4dda4 dfa4dd38 81689714 81461c34 00000102 00000000 dd40: 00000000 00000000 00000000 00000000 82f73388 84e5b2fc 82f73534 dfa4df38 dd60: 00000000 bb43af24 8260ca7c 821cb998 00000102 bb43af24 dfa4df38 816895c4 dd80: dfa4df38 83277400 00000102 00000000 00000102 dfa4ddf4 dfa4ddc4 dfa4dda8 dda0: 8168845c 816895d0 00000000 00000102 00000000 81688424 dfa4dde4 dfa4ddc8 ddc0: 813d0ddc 81688430 dfa4df38 200004c0 83277400 00000000 dfa4dea4 dfa4dde8 dde0: 813d0fe0 813d0d98 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 bb43af24 00000000 00000000 de80: dfa4df38 200004c0 00000102 83277400 836b3000 00000129 dfa4df24 dfa4dea8 dea0: 813d40c4 813d0f5c 00000102 00000000 80287344 00000000 00000000 200002c0 dec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 bb43af24 df00: dfa4df24 83277400 00000000 200004c0 00000102 8020029c dfa4dfa4 dfa4df28 df20: 813d48a4 813d4048 00000000 dfa4df38 00000001 fffffff7 dfa4ddf4 00000000 df40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020c910 bb43af24 00000000 00000000 00264318 00000129 00000000 dfa4dfa8 dfa0: 80200060 813d483c 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 00264318 00000129 7eece79e 7eece79f 003d0f00 76b6e0bc dfe0: 76b6dec8 76b6deb8 00017e64 00130c30 60000010 00000003 00000000 00000000 Call trace: [<80480efc>] (__kmap_local_page_prot) from [<8080681c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80480efc>] (__kmap_local_page_prot) from [<8080681c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806724>] (copy_page_to_iter) from [<81461d18>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:8428f400 r4:8428f400 [<81461c28>] (sk_msg_recvmsg) from [<81689714>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461c28>] (sk_msg_recvmsg) from [<81689714>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:836b3000 r6:84e5b200 r5:000000c7 r4:82f73300 [<816895c4>] (unix_bpf_recvmsg) from [<8168845c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:dfa4ddf4 r9:00000102 r8:00000000 r7:00000102 r6:83277400 r5:dfa4df38 r4:816895c4 [<81688424>] (unix_dgram_recvmsg) from [<813d0ddc>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81688424>] (unix_dgram_recvmsg) from [<813d0ddc>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81688424 [<813d0d8c>] (sock_recvmsg) from [<813d0fe0>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:83277400 r5:200004c0 r4:dfa4df38 [<813d0f50>] (____sys_recvmsg) from [<813d40c4>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:836b3000 r8:83277400 r7:00000102 r6:200004c0 r5:dfa4df38 r4:00000000 [<813d403c>] (___sys_recvmsg) from [<813d48a4>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d403c>] (___sys_recvmsg) from [<813d48a4>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d403c>] (___sys_recvmsg) from [<813d48a4>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:83277400 [<813d4830>] (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 00000102 00000000 dfc0: 00000000 00000000 00264318 00000129 7eece79e 7eece79f 003d0f00 76b6e0bc dfe0: 76b6dec8 76b6deb8 00017e64 00130c30 r7:00000129 r6:00264318 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