8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=83798003, *pmd=fe6bd003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 3002 Comm: syz-executor504 Not tainted 6.9.0-rc3-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 : [<80479f08>] lr : [<807e99cc>] psr: 60000013 sp : df96dca0 ip : df96dcb0 fp : df96dcac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8440a800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84781040 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 8440a800 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 0xdf96c000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xdf96c000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor504 (pid: 3002, stack limit = 0xdf96c000) Stack: (0xdf96dca0 to 0xdf96e000) dca0: df96dce4 df96dcb0 807e99cc 80479f08 df96dcd4 df96df48 8024c880 8440a800 dcc0: 8440a800 00000000 00000000 00000000 000000d4 00000018 df96dd34 df96dce8 dce0: 8143329c 807e98e0 00000000 582a563e 83fbb400 83fbb4d0 835fc900 83fbb4d8 dd00: df96df48 00000000 df96dd8c 835fc900 000000d4 83fbb400 841c5400 00000000 dd20: 00000000 00000000 df96dda4 df96dd38 81655f50 814331b8 00000000 00000000 dd40: 00000000 00000000 00000000 00000000 835fc988 83fbb4ec 835fcb34 df96df38 dd60: 00000000 582a563e df96dd94 821a9848 00000000 582a563e df96df38 81655e00 dd80: df96df38 83349680 00000000 00000000 00000000 df96ddf4 df96ddc4 df96dda8 dda0: 81654fcc 81655e0c 00000000 00000000 00000000 81654f94 df96dde4 df96ddc8 ddc0: 813a287c 81654fa0 df96df38 83349680 200001c0 00000000 df96dea4 df96dde8 dde0: 813a2a7c 813a2838 00000000 00000000 00000001 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 582a563e 00000000 00000000 de80: df96df38 200001c0 00000000 83349680 841c5400 00000129 df96df24 df96dea8 dea0: 813a59c0 813a29f8 00000000 00000000 00000000 00000000 00000000 20000280 dec0: 000000d4 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 582a563e df00: df96df24 83349680 00000000 200001c0 00000000 80200288 df96dfa4 df96df28 df20: 813a613c 813a5944 00000000 00000000 00000000 fffffff7 df96ddf4 00000000 df40: 00000000 00000000 00000000 00000000 20000280 000000d4 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: df96dfa4 582a563e ffffffff 00000000 0008e070 00000129 00000000 df96dfa8 dfa0: 80200060 813a60d4 ffffffff 00000000 00000003 200001c0 00000000 00000000 dfc0: ffffffff 00000000 0008e070 00000129 20000080 00000000 0008a270 00000000 dfe0: 7ee5cc70 7ee5cc60 00010a8c 0002eb90 00000010 00000003 00000000 00000000 Call trace: [<80479efc>] (__kmap_local_page_prot) from [<807e99cc>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479efc>] (__kmap_local_page_prot) from [<807e99cc>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e98d4>] (copy_page_to_iter) from [<8143329c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000d4 r8:00000000 r7:00000000 r6:00000000 r5:8440a800 r4:8440a800 [<814331ac>] (sk_msg_recvmsg) from [<81655f50>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<814331ac>] (sk_msg_recvmsg) from [<81655f50>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:841c5400 r6:83fbb400 r5:000000d4 r4:835fc900 [<81655e00>] (unix_bpf_recvmsg) from [<81654fcc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:df96ddf4 r9:00000000 r8:00000000 r7:00000000 r6:83349680 r5:df96df38 r4:81655e00 [<81654f94>] (unix_dgram_recvmsg) from [<813a287c>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81654f94>] (unix_dgram_recvmsg) from [<813a287c>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81654f94 [<813a282c>] (sock_recvmsg) from [<813a2a7c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200001c0 r5:83349680 r4:df96df38 [<813a29ec>] (____sys_recvmsg) from [<813a59c0>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:841c5400 r8:83349680 r7:00000000 r6:200001c0 r5:df96df38 r4:00000000 [<813a5938>] (___sys_recvmsg) from [<813a613c>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a5938>] (___sys_recvmsg) from [<813a613c>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a5938>] (___sys_recvmsg) from [<813a613c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:200001c0 r5:00000000 r4:83349680 [<813a60c8>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdf96dfa8 to 0xdf96dff0) dfa0: ffffffff 00000000 00000003 200001c0 00000000 00000000 dfc0: ffffffff 00000000 0008e070 00000129 20000080 00000000 0008a270 00000000 dfe0: 7ee5cc70 7ee5cc60 00010a8c 0002eb90 r7:00000129 r6:0008e070 r5:00000000 r4:ffffffff 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