8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=851d9003, *pmd=fe7a6003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 5144 Comm: syz-executor.1 Not tainted 6.9.0-rc6-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 : [<8047a26c>] lr : [<807e9d04>] psr: 60000013 sp : dfce9ca0 ip : dfce9cb0 fp : dfce9cac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8550b800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84f29b40 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 8550b800 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 0xdfce8000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfce8000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.1 (pid: 5144, stack limit = 0xdfce8000) Stack: (0xdfce9ca0 to 0xdfcea000) 9ca0: dfce9ce4 dfce9cb0 807e9d04 8047a26c dfce9cd4 dfce9f48 8024c860 8550b800 9cc0: 8550b800 00000000 00000001 00000000 000000c7 00000018 dfce9d34 dfce9ce8 9ce0: 81433d5c 807e9c18 00000000 b298be14 845ae200 845ae2d0 83ec8f00 845ae2d8 9d00: dfce9f48 00000002 dfce9d8c 83ec8f00 000000c7 845ae200 8532ec00 00000000 9d20: 00000102 00000000 dfce9da4 dfce9d38 81656a68 81433c78 00000102 00000000 9d40: 00000000 00000000 00000000 00000000 83ec8f88 845ae2ec 83ec9134 dfce9f38 9d60: 00000000 b298be14 818c3da0 821a9848 00000102 b298be14 dfce9f38 81656918 9d80: dfce9f38 831db400 00000102 00000000 00000102 dfce9df4 dfce9dc4 dfce9da8 9da0: 81655ae4 81656924 00000000 00000102 00000000 81655aac dfce9de4 dfce9dc8 9dc0: 813a33ac 81655ab8 dfce9f38 831db400 200004c0 00000000 dfce9ea4 dfce9de8 9de0: 813a35ac 813a3368 00000000 00000000 00000001 00000000 00000000 00000000 9e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e60: 00000000 00000000 00000000 00000000 00000000 b298be14 00000000 00000000 9e80: dfce9f38 200004c0 00000102 831db400 8532ec00 00000129 dfce9f24 dfce9ea8 9ea0: 813a64f0 813a3528 00000102 00000000 00000008 00000000 00000000 200002c0 9ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 b298be14 9f00: dfce9f24 831db400 00000000 200004c0 00000102 80200288 dfce9fa4 dfce9f28 9f20: 813a6c6c 813a6474 00000000 dfce9f38 00000001 fffffff7 dfce9df4 00000000 9f40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020ca6c b298be14 00000000 00000000 0014c2c8 00000129 00000000 dfce9fa8 9fa0: 80200060 813a6c04 00000000 00000000 00000003 200004c0 00000102 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7edbd32e 7edbd32f 003d0f00 76b300fc 9fe0: 76b2ff08 76b2fef8 00016ab0 00050bf0 60000010 00000003 00000000 00000000 Call trace: [<8047a260>] (__kmap_local_page_prot) from [<807e9d04>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a260>] (__kmap_local_page_prot) from [<807e9d04>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9c0c>] (copy_page_to_iter) from [<81433d5c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:8550b800 r4:8550b800 [<81433c6c>] (sk_msg_recvmsg) from [<81656a68>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81433c6c>] (sk_msg_recvmsg) from [<81656a68>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:8532ec00 r6:845ae200 r5:000000c7 r4:83ec8f00 [<81656918>] (unix_bpf_recvmsg) from [<81655ae4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfce9df4 r9:00000102 r8:00000000 r7:00000102 r6:831db400 r5:dfce9f38 r4:81656918 [<81655aac>] (unix_dgram_recvmsg) from [<813a33ac>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81655aac>] (unix_dgram_recvmsg) from [<813a33ac>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81655aac [<813a335c>] (sock_recvmsg) from [<813a35ac>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:831db400 r4:dfce9f38 [<813a351c>] (____sys_recvmsg) from [<813a64f0>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:8532ec00 r8:831db400 r7:00000102 r6:200004c0 r5:dfce9f38 r4:00000000 [<813a6468>] (___sys_recvmsg) from [<813a6c6c>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a6468>] (___sys_recvmsg) from [<813a6c6c>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a6468>] (___sys_recvmsg) from [<813a6c6c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000102 r6:200004c0 r5:00000000 r4:831db400 [<813a6bf8>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfce9fa8 to 0xdfce9ff0) 9fa0: 00000000 00000000 00000003 200004c0 00000102 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7edbd32e 7edbd32f 003d0f00 76b300fc 9fe0: 76b2ff08 76b2fef8 00016ab0 00050bf0 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