8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8508b003, *pmd=fe51b003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 3722 Comm: syz-executor.0 Not tainted 6.9.0-rc1-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 : [<80479d2c>] lr : [<807eb0fc>] psr: 60000013 sp : e0025ca0 ip : e0025cb0 fp : e0025cac r10: 00000018 r9 : 828584e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84f8b800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85082e40 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 84f8b800 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 0xe0024000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xe0024000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.0 (pid: 3722, stack limit = 0xe0024000) Stack: (0xe0025ca0 to 0xe0026000) 5ca0: e0025ce4 e0025cb0 807eb0fc 80479d2c 84e54e00 e0025f48 00000000 84f8b800 5cc0: 84f8b800 00000000 00000000 00000000 000000d4 00000018 e0025d34 e0025ce8 5ce0: 8140afac 807eb010 84173000 00000000 84e54e00 84e54ed0 844ffc00 84e54ed8 5d00: e0025f48 00000000 00000000 844ffc00 000000d4 84e54e00 84173000 00000000 5d20: 00000000 00000000 e0025da4 e0025d38 8162d6a0 8140aec8 00000000 00000000 5d40: 00000000 00000000 00000000 00000000 844ffc88 84e54eec 844ffe34 e0025f38 5d60: 00000000 3d193984 8260ca3c 8219a848 00000000 3d193984 e0025f38 8162d550 5d80: e0025f38 84817900 00000000 00000000 00000000 e0025df4 e0025dc4 e0025da8 5da0: 8162c73c 8162d55c 00000000 00000000 00000000 8162c704 e0025de4 e0025dc8 5dc0: 8137a598 8162c710 e0025f38 84817900 200001c0 00000000 e0025ea4 e0025de8 5de0: 8137a798 8137a554 00000000 00000000 00000001 00000000 00000000 00000000 5e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e60: 00000000 00000000 00000000 00000000 00000000 3d193984 00000000 00000000 5e80: e0025f38 200001c0 00000000 84817900 84173000 00000129 e0025f24 e0025ea8 5ea0: 8137d6dc 8137a714 00000000 00000000 00000008 00000000 00000000 20000280 5ec0: 000000d4 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3d193984 5f00: e0025f24 84817900 00000000 200001c0 00000000 80200288 e0025fa4 e0025f28 5f20: 8137de58 8137d660 00000000 e0025f38 00000001 fffffff7 e0025df4 00000000 5f40: 00000000 00000000 00000000 00000000 20000280 000000d4 00000001 00000000 5f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 5f80: 8020ca6c 3d193984 00000000 00000000 0014c2c8 00000129 00000000 e0025fa8 5fa0: 80200060 8137ddf0 00000000 00000000 00000003 200001c0 00000000 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7ecd732e 7ecd732f 003d0f00 76b460fc 5fe0: 76b45f08 76b45ef8 000167f8 00050bc0 60000010 00000003 00000000 00000000 Call trace: [<80479d20>] (__kmap_local_page_prot) from [<807eb0fc>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479d20>] (__kmap_local_page_prot) from [<807eb0fc>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807eb004>] (copy_page_to_iter) from [<8140afac>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000d4 r8:00000000 r7:00000000 r6:00000000 r5:84f8b800 r4:84f8b800 [<8140aebc>] (sk_msg_recvmsg) from [<8162d6a0>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8140aebc>] (sk_msg_recvmsg) from [<8162d6a0>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84173000 r6:84e54e00 r5:000000d4 r4:844ffc00 [<8162d550>] (unix_bpf_recvmsg) from [<8162c73c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:e0025df4 r9:00000000 r8:00000000 r7:00000000 r6:84817900 r5:e0025f38 r4:8162d550 [<8162c704>] (unix_dgram_recvmsg) from [<8137a598>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8162c704>] (unix_dgram_recvmsg) from [<8137a598>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:8162c704 [<8137a548>] (sock_recvmsg) from [<8137a798>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200001c0 r5:84817900 r4:e0025f38 [<8137a708>] (____sys_recvmsg) from [<8137d6dc>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:84173000 r8:84817900 r7:00000000 r6:200001c0 r5:e0025f38 r4:00000000 [<8137d654>] (___sys_recvmsg) from [<8137de58>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8137d654>] (___sys_recvmsg) from [<8137de58>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8137d654>] (___sys_recvmsg) from [<8137de58>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:200001c0 r5:00000000 r4:84817900 [<8137dde4>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe0025fa8 to 0xe0025ff0) 5fa0: 00000000 00000000 00000003 200001c0 00000000 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7ecd732e 7ecd732f 003d0f00 76b460fc 5fe0: 76b45f08 76b45ef8 000167f8 00050bc0 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