8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84602003, *pmd=fef2e003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 12855 Comm: syz-executor.1 Not tainted 6.10.0-rc1-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 : [<80481518>] lr : [<80806b80>] psr: 60000013 sp : dfe49ca0 ip : dfe49cb0 fp : dfe49cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85ae4400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85aee340 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 85ae4400 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 0xdfe48000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfe48000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 12855, stack limit = 0xdfe48000) Stack: (0xdfe49ca0 to 0xdfe4a000) 9ca0: dfe49ce4 dfe49cb0 80806b80 80481518 dfe49cd4 dfe49f48 8024d2c4 85ae4400 9cc0: 85ae4400 00000000 00000001 00000000 000000c7 00000018 dfe49d34 dfe49ce8 9ce0: 81463334 80806a94 00000000 ff312582 844c5600 844c56e0 84d78900 844c56e8 9d00: dfe49f48 00000002 dfe49d8c 84d78900 000000c7 844c5600 83d5ec00 00000000 9d20: 00000102 00000000 dfe49da4 dfe49d38 8168aa74 81463250 00000102 00000000 9d40: 00000000 00000000 00000000 00000000 84d78988 844c56fc 84d78b34 dfe49f38 9d60: 00000000 ff312582 818f78b4 821cb998 00000102 ff312582 dfe49f38 8168a924 9d80: dfe49f38 84869680 00000102 00000000 00000102 dfe49df4 dfe49dc4 dfe49da8 9da0: 816897bc 8168a930 00000000 00000102 00000000 81689784 dfe49de4 dfe49dc8 9dc0: 813d2580 81689790 dfe49f38 200004c0 84869680 00000000 dfe49ea4 dfe49de8 9de0: 813d2784 813d253c 00000001 00000000 dfe49e34 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 ff312582 00000000 00000000 9e80: dfe49f38 200004c0 00000102 84869680 83d5ec00 00000129 dfe49f24 dfe49ea8 9ea0: 813d5868 813d2700 00000102 00000000 80287344 00000000 00000000 200002c0 9ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ff312582 9f00: dfe49f24 84869680 00000000 200004c0 00000102 8020029c dfe49fa4 dfe49f28 9f20: 813d6048 813d57ec 00000000 dfe49f38 00000001 fffffff7 dfe49df4 00000000 9f40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020c910 ff312582 00000000 00000000 001542c8 00000129 00000000 dfe49fa8 9fa0: 80200060 813d5fe0 00000000 00000000 00000003 200004c0 00000102 00000000 9fc0: 00000000 00000000 001542c8 00000129 7edad32e 7edad32f 003d0f00 76b590fc 9fe0: 76b58f08 76b58ef8 00016db0 00051530 60000010 00000003 00000000 00000000 Call trace: [<8048150c>] (__kmap_local_page_prot) from [<80806b80>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8048150c>] (__kmap_local_page_prot) from [<80806b80>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806a88>] (copy_page_to_iter) from [<81463334>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:85ae4400 r4:85ae4400 [<81463244>] (sk_msg_recvmsg) from [<8168aa74>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81463244>] (sk_msg_recvmsg) from [<8168aa74>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:83d5ec00 r6:844c5600 r5:000000c7 r4:84d78900 [<8168a924>] (unix_bpf_recvmsg) from [<816897bc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2484) r10:dfe49df4 r9:00000102 r8:00000000 r7:00000102 r6:84869680 r5:dfe49f38 r4:8168a924 [<81689784>] (unix_dgram_recvmsg) from [<813d2580>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81689784>] (unix_dgram_recvmsg) from [<813d2580>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81689784 [<813d2530>] (sock_recvmsg) from [<813d2784>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:84869680 r5:200004c0 r4:dfe49f38 [<813d26f4>] (____sys_recvmsg) from [<813d5868>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:83d5ec00 r8:84869680 r7:00000102 r6:200004c0 r5:dfe49f38 r4:00000000 [<813d57e0>] (___sys_recvmsg) from [<813d6048>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d57e0>] (___sys_recvmsg) from [<813d6048>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d57e0>] (___sys_recvmsg) from [<813d6048>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:84869680 [<813d5fd4>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe49fa8 to 0xdfe49ff0) 9fa0: 00000000 00000000 00000003 200004c0 00000102 00000000 9fc0: 00000000 00000000 001542c8 00000129 7edad32e 7edad32f 003d0f00 76b590fc 9fe0: 76b58f08 76b58ef8 00016db0 00051530 r7:00000129 r6:001542c8 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