8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84e2f003, *pmd=f15a0003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 7097 Comm: syz-executor.1 Not tainted 6.9.0-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 : [<80483328>] lr : [<80809da4>] psr: 60000013 sp : dfbf9ca0 ip : dfbf9cb0 fp : dfbf9cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85592800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 850b0dc0 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 85592800 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 0xdfbf8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfbf8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.1 (pid: 7097, stack limit = 0xdfbf8000) Stack: (0xdfbf9ca0 to 0xdfbfa000) 9ca0: dfbf9ce4 dfbf9cb0 80809da4 80483328 dfbf9cd4 dfbf9f48 8024d41c 85592800 9cc0: 85592800 00000000 00000000 00000000 000000c7 00000018 dfbf9d34 dfbf9ce8 9ce0: 8146db94 80809cb8 00000000 5b86f447 853c3400 853c34e0 82e15b00 853c34e8 9d00: dfbf9f48 00000000 dfbf9d8c 82e15b00 000000c7 853c3400 84908c00 00000000 9d20: 00000000 00000000 dfbf9da4 dfbf9d38 816951b4 8146dab0 00000000 00000000 9d40: 00000000 00000000 00000000 00000000 82e15b88 853c34fc 82e15d34 dfbf9f38 9d60: 00000000 5b86f447 819065f4 821cd998 00000000 5b86f447 dfbf9f38 81695064 9d80: dfbf9f38 844b2c80 00000000 00000000 00000000 dfbf9df4 dfbf9dc4 dfbf9da8 9da0: 81693f48 81695070 00000000 00000000 00000000 81693f10 dfbf9de4 dfbf9dc8 9dc0: 813db918 81693f1c dfbf9f38 200004c0 844b2c80 00000000 dfbf9ea4 dfbf9de8 9de0: 813dbb1c 813db8d4 00000001 00000000 dfbf9e34 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 5b86f447 00000000 00000000 9e80: dfbf9f38 200004c0 00000000 844b2c80 84908c00 00000129 dfbf9f24 dfbf9ea8 9ea0: 813dec00 813dba98 00000000 00000000 80287ac4 00000000 00000000 200002c0 9ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5b86f447 9f00: dfbf9f24 844b2c80 00000000 200004c0 00000000 8020029c dfbf9fa4 dfbf9f28 9f20: 813df3e0 813deb84 00000000 dfbf9f38 00000001 fffffff7 dfbf9df4 00000000 9f40: 00000000 00000000 00000000 00000000 200002c0 000000c7 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020c910 5b86f447 00000000 00000000 0014c2c8 00000129 00000000 dfbf9fa8 9fa0: 80200060 813df378 00000000 00000000 00000003 200004c0 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7eec432e 7eec432f 003d0f00 76b8f0fc 9fe0: 76b8ef08 76b8eef8 00016d28 00051560 60000010 00000003 00000000 00000000 Call trace: [<8048331c>] (__kmap_local_page_prot) from [<80809da4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8048331c>] (__kmap_local_page_prot) from [<80809da4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80809cac>] (copy_page_to_iter) from [<8146db94>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000000 r6:00000000 r5:85592800 r4:85592800 [<8146daa4>] (sk_msg_recvmsg) from [<816951b4>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8146daa4>] (sk_msg_recvmsg) from [<816951b4>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84908c00 r6:853c3400 r5:000000c7 r4:82e15b00 [<81695064>] (unix_bpf_recvmsg) from [<81693f48>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2482) r10:dfbf9df4 r9:00000000 r8:00000000 r7:00000000 r6:844b2c80 r5:dfbf9f38 r4:81695064 [<81693f10>] (unix_dgram_recvmsg) from [<813db918>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81693f10>] (unix_dgram_recvmsg) from [<813db918>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81693f10 [<813db8c8>] (sock_recvmsg) from [<813dbb1c>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:844b2c80 r5:200004c0 r4:dfbf9f38 [<813dba8c>] (____sys_recvmsg) from [<813dec00>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:84908c00 r8:844b2c80 r7:00000000 r6:200004c0 r5:dfbf9f38 r4:00000000 [<813deb78>] (___sys_recvmsg) from [<813df3e0>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813deb78>] (___sys_recvmsg) from [<813df3e0>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813deb78>] (___sys_recvmsg) from [<813df3e0>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:844b2c80 [<813df36c>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbf9fa8 to 0xdfbf9ff0) 9fa0: 00000000 00000000 00000003 200004c0 00000000 00000000 9fc0: 00000000 00000000 0014c2c8 00000129 7eec432e 7eec432f 003d0f00 76b8f0fc 9fe0: 76b8ef08 76b8eef8 00016d28 00051560 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