8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=856e6003, *pmd=fed47003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 11105 Comm: syz-executor.1 Not tainted 6.9.0-rc5-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 : [<8047a19c>] lr : [<807e9c0c>] psr: 60000013 sp : dfad1c20 ip : dfad1c30 fp : dfad1c2c r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8449c000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 853b4900 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 8449c000 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 0xdfad0000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfad0000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.1 (pid: 11105, stack limit = 0xdfad0000) Stack: (0xdfad1c20 to 0xdfad2000) 1c20: dfad1c64 dfad1c30 807e9c0c 8047a19c dfad1c54 dfad1ef0 8024c860 8449c000 1c40: 8449c000 00000000 00000000 00000000 00000041 00000018 dfad1cb4 dfad1c68 1c60: 81433c6c 807e9b20 dfad1cec dfad1c78 838cf200 838cf2d0 85188c00 838cf2d8 1c80: dfad1ef0 00000000 dfad1c94 85188c00 00000041 838cf200 84cab000 00000000 1ca0: 00000000 00000000 dfad1d24 dfad1cb8 81656978 81433b88 00000000 dfad1ee0 1cc0: 00000000 92258afd 00e6e571 821a9848 85188c88 838cf2ec 85188e34 dfad1ee0 1ce0: dfad1ee0 83233900 00000000 00000000 00000000 92258afd dfad1d24 81656828 1d00: 83233900 20000d60 816559bc 00000000 00000000 dfad1d54 dfad1d44 dfad1d28 1d20: 816559f4 81656834 00000000 83233900 20000d40 dfad1ee0 dfad1e04 dfad1d48 1d40: 813a3560 816559c8 00000000 00000000 00000001 00000000 00000000 00000000 1d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1dc0: 00000000 00000000 00000000 00000000 00000000 92258afd 00000000 00000000 1de0: dfad1ee0 20000d60 00000000 83233900 84cab000 00000002 dfad1e84 dfad1e08 1e00: 813a6400 813a3438 00000000 00000001 8031cab4 00000000 00000000 20000500 1e20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 92258afd 1e60: dfad1e84 dfad1ec0 20000d60 00000001 00000000 00000000 dfad1f5c dfad1e88 1e80: 813a6528 813a6384 00000001 dfad1e98 8089ac78 83233900 00000001 00000000 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ec0: 00000000 00000000 00050bf0 00000000 00000000 00000000 dfad1f04 dfad1ee8 1ee0: dfad1d54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 1f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 1f20: 00000000 00000000 dfad1f44 92258afd 818c0f10 00000005 20000d40 00000000 1f40: 00000000 00000002 84cab000 0000016d dfad1fa4 dfad1f60 813a6ebc 813a6440 1f60: 00000000 dfad1fb0 00000000 00000000 00000000 00000000 dfad1fac 92258afd 1f80: 8020ca6c 00000000 00000000 0014c360 0000016d 80200288 00000000 dfad1fa8 1fa0: 80200060 813a6e04 00000000 00000000 00000005 20000d40 00000002 00000000 1fc0: 00000000 00000000 0014c360 0000016d 7ea3832e 7ea3832f 003d0f00 76b510fc 1fe0: 76b50f08 76b50ef8 00016ab0 00050bf0 60000010 00000005 00000000 00000000 Call trace: [<8047a190>] (__kmap_local_page_prot) from [<807e9c0c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a190>] (__kmap_local_page_prot) from [<807e9c0c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9b14>] (copy_page_to_iter) from [<81433c6c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:8449c000 r4:8449c000 [<81433b7c>] (sk_msg_recvmsg) from [<81656978>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81433b7c>] (sk_msg_recvmsg) from [<81656978>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84cab000 r6:838cf200 r5:00000041 r4:85188c00 [<81656828>] (unix_bpf_recvmsg) from [<816559f4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfad1d54 r9:00000000 r8:00000000 r7:816559bc r6:20000d60 r5:83233900 r4:81656828 [<816559bc>] (unix_dgram_recvmsg) from [<813a3560>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<816559bc>] (unix_dgram_recvmsg) from [<813a3560>] (____sys_recvmsg+0x134/0x158 net/socket.c:2801) r4:dfad1ee0 [<813a342c>] (____sys_recvmsg) from [<813a6400>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:84cab000 r8:83233900 r7:00000000 r6:20000d60 r5:dfad1ee0 r4:00000000 [<813a6378>] (___sys_recvmsg) from [<813a6528>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:dfad1ec0 [<813a6434>] (do_recvmmsg) from [<813a6ebc>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<813a6434>] (do_recvmmsg) from [<813a6ebc>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<813a6434>] (do_recvmmsg) from [<813a6ebc>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84cab000 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000005 [<813a6df8>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfad1fa8 to 0xdfad1ff0) 1fa0: 00000000 00000000 00000005 20000d40 00000002 00000000 1fc0: 00000000 00000000 0014c360 0000016d 7ea3832e 7ea3832f 003d0f00 76b510fc 1fe0: 76b50f08 76b50ef8 00016ab0 00050bf0 r8:80200288 r7:0000016d r6:0014c360 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