8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8593e003, *pmd=fe452003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 11177 Comm: syz-executor.0 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 : [<8047a614>] lr : [<807ea0ac>] psr: 60000013 sp : dfc45ca0 ip : dfc45cb0 fp : dfc45cac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 846f8400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 853d3640 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 846f8400 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 0xdfc44000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfc44000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.0 (pid: 11177, stack limit = 0xdfc44000) Stack: (0xdfc45ca0 to 0xdfc46000) 5ca0: dfc45ce4 dfc45cb0 807ea0ac 8047a614 dfc45cd4 dfc45f48 8024caa0 846f8400 5cc0: 846f8400 00000000 00000000 00000000 00000085 00000018 dfc45d34 dfc45ce8 5ce0: 81434694 807e9fc0 00000000 0b749a05 852f7800 852f78d0 83413000 852f78d8 5d00: dfc45f48 00000000 dfc45d8c 83413000 00000085 852f7800 82eeb000 00000000 5d20: 00000000 00000000 dfc45da4 dfc45d38 81657440 814345b0 00000000 00000000 5d40: 00000000 00000000 00000000 00000000 83413088 852f78ec 83413234 dfc45f38 5d60: 00000000 0b749a05 818c47c0 821a9848 00000000 0b749a05 dfc45f38 816572f0 5d80: dfc45f38 8492fb80 00000000 00000000 00000000 dfc45df4 dfc45dc4 dfc45da8 5da0: 816564bc 816572fc 00000000 00000000 00000000 81656484 dfc45de4 dfc45dc8 5dc0: 813a3bfc 81656490 dfc45f38 8492fb80 20000740 00000000 dfc45ea4 dfc45de8 5de0: 813a3dfc 813a3bb8 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 0b749a05 00000000 00000000 5e80: dfc45f38 20000740 00000000 8492fb80 82eeb000 00000129 dfc45f24 dfc45ea8 5ea0: 813a6d40 813a3d78 00000000 00000000 00000008 00000000 00000000 20000100 5ec0: 00000085 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 0b749a05 5f00: dfc45f24 8492fb80 00000000 20000740 00000000 80200288 dfc45fa4 dfc45f28 5f20: 813a74bc 813a6cc4 00000000 dfc45f38 00000001 fffffff7 dfc45df4 00000000 5f40: 00000000 00000000 00000000 00000000 20000100 00000085 00000001 00000000 5f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 5f80: 8020ca6c 0b749a05 00000000 00000000 0014c2c8 00000129 00000000 dfc45fa8 5fa0: 80200060 813a7454 00000000 00000000 00000003 20000740 00000000 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7ef8c32e 7ef8c32f 003d0f00 76b450fc 5fe0: 76b44f08 76b44ef8 00016ab0 00050bc0 60000010 00000003 00000000 00000000 Call trace: [<8047a608>] (__kmap_local_page_prot) from [<807ea0ac>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a608>] (__kmap_local_page_prot) from [<807ea0ac>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9fb4>] (copy_page_to_iter) from [<81434694>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000085 r8:00000000 r7:00000000 r6:00000000 r5:846f8400 r4:846f8400 [<814345a4>] (sk_msg_recvmsg) from [<81657440>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<814345a4>] (sk_msg_recvmsg) from [<81657440>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:82eeb000 r6:852f7800 r5:00000085 r4:83413000 [<816572f0>] (unix_bpf_recvmsg) from [<816564bc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfc45df4 r9:00000000 r8:00000000 r7:00000000 r6:8492fb80 r5:dfc45f38 r4:816572f0 [<81656484>] (unix_dgram_recvmsg) from [<813a3bfc>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81656484>] (unix_dgram_recvmsg) from [<813a3bfc>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81656484 [<813a3bac>] (sock_recvmsg) from [<813a3dfc>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000740 r5:8492fb80 r4:dfc45f38 [<813a3d6c>] (____sys_recvmsg) from [<813a6d40>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:82eeb000 r8:8492fb80 r7:00000000 r6:20000740 r5:dfc45f38 r4:00000000 [<813a6cb8>] (___sys_recvmsg) from [<813a74bc>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a6cb8>] (___sys_recvmsg) from [<813a74bc>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a6cb8>] (___sys_recvmsg) from [<813a74bc>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:20000740 r5:00000000 r4:8492fb80 [<813a7448>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfc45fa8 to 0xdfc45ff0) 5fa0: 00000000 00000000 00000003 20000740 00000000 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7ef8c32e 7ef8c32f 003d0f00 76b450fc 5fe0: 76b44f08 76b44ef8 00016ab0 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