8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85aba003, *pmd=fec52003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 8568 Comm: syz.0.544 Not tainted 6.10.0-rc5-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1102 [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 : [<80480fc0>] lr : [<8080689c>] psr: 60000013 sp : eabb9ca0 ip : eabb9cb0 fp : eabb9cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85912800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85ab3fc0 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 85912800 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 0xeabb8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xeabb8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz.0.544 (pid: 8568, stack limit = 0xeabb8000) Stack: (0xeabb9ca0 to 0xeabba000) 9ca0: eabb9ce4 eabb9cb0 8080689c 80480fc0 eabb9cd4 eabb9f48 8024d2c4 85912800 9cc0: 85912800 00000000 00000000 00000000 00001000 00000018 eabb9d34 eabb9ce8 9ce0: 81461d98 808067b0 40000013 833db440 854e9a00 854e9ae0 85054300 854e9ae8 9d00: eabb9f48 00000000 eabb9d34 85054300 00001000 854e9a00 83e81800 00000001 9d20: 00000000 00000000 eabb9da4 eabb9d38 81689794 81461cb4 00000000 00000000 9d40: 00000000 854e9ae0 854e9ad0 7fffffff 85054388 854e9afc 85054534 eabb9f38 9d60: 00000000 83e81800 802a494c 00000100 00000122 f5507382 eabb9f38 81689644 9d80: eabb9f38 833db400 00000000 00000000 00000000 eabb9df4 eabb9dc4 eabb9da8 9da0: 816884dc 81689650 00000000 00000000 00000000 816884a4 eabb9de4 eabb9dc8 9dc0: 813d0e5c 816884b0 eabb9f38 200004c0 833db400 00000000 eabb9ea4 eabb9de8 9de0: 813d1060 813d0e18 00000001 00000000 eabb9e34 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 f5507382 00000000 00000000 9e80: eabb9f38 200004c0 00000000 833db400 83e81800 00000129 eabb9f24 eabb9ea8 9ea0: 813d4144 813d0fdc 00000000 00000000 802873fc 00000000 00000000 20002c40 9ec0: 00001000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 f5507382 9f00: eabb9f24 833db400 00000000 200004c0 00000000 8020029c eabb9fa4 eabb9f28 9f20: 813d4924 813d40c8 00000000 eabb9f38 00000001 fffffff7 eabb9df4 00000000 9f40: 00000000 00000000 00000000 00000000 20002c40 00001000 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020c910 f5507382 00000000 00000000 00264318 00000129 00000000 eabb9fa8 9fa0: 80200060 813d48bc 00000000 00000000 00000005 200004c0 00000000 00000000 9fc0: 00000000 00000000 00264318 00000129 7ebbf78e 7ebbf78f 003d0f00 76bfc0bc 9fe0: 76bfbec8 76bfbeb8 00017e64 00130980 60000010 00000005 00000000 00000000 Call trace: [<80480fb4>] (__kmap_local_page_prot) from [<8080689c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80480fb4>] (__kmap_local_page_prot) from [<8080689c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<808067a4>] (copy_page_to_iter) from [<81461d98>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00001000 r8:00000000 r7:00000000 r6:00000000 r5:85912800 r4:85912800 [<81461ca8>] (sk_msg_recvmsg) from [<81689794>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461ca8>] (sk_msg_recvmsg) from [<81689794>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:83e81800 r6:854e9a00 r5:00001000 r4:85054300 [<81689644>] (unix_bpf_recvmsg) from [<816884dc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:eabb9df4 r9:00000000 r8:00000000 r7:00000000 r6:833db400 r5:eabb9f38 r4:81689644 [<816884a4>] (unix_dgram_recvmsg) from [<813d0e5c>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<816884a4>] (unix_dgram_recvmsg) from [<813d0e5c>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:816884a4 [<813d0e0c>] (sock_recvmsg) from [<813d1060>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:833db400 r5:200004c0 r4:eabb9f38 [<813d0fd0>] (____sys_recvmsg) from [<813d4144>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:83e81800 r8:833db400 r7:00000000 r6:200004c0 r5:eabb9f38 r4:00000000 [<813d40bc>] (___sys_recvmsg) from [<813d4924>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d40bc>] (___sys_recvmsg) from [<813d4924>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d40bc>] (___sys_recvmsg) from [<813d4924>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:833db400 [<813d48b0>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeabb9fa8 to 0xeabb9ff0) 9fa0: 00000000 00000000 00000005 200004c0 00000000 00000000 9fc0: 00000000 00000000 00264318 00000129 7ebbf78e 7ebbf78f 003d0f00 76bfc0bc 9fe0: 76bfbec8 76bfbeb8 00017e64 00130980 r7:00000129 r6:00264318 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