8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84582003, *pmd=fe630003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 13508 Comm: syz.0.1658 Not tainted 6.10.0-rc6-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 : [<804810d0>] lr : [<80806804>] psr: 60000013 sp : dfb19ca0 ip : dfb19cb0 fp : dfb19cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8571f000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8521ecc0 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 8571f000 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 0xdfb18000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfb18000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz.0.1658 (pid: 13508, stack limit = 0xdfb18000) Stack: (0xdfb19ca0 to 0xdfb1a000) 9ca0: dfb19ce4 dfb19cb0 80806804 804810d0 dfb19cd4 dfb19f48 8024d29c 8571f000 9cc0: 8571f000 00000000 00000000 00000000 00022fe0 00000018 dfb19d34 dfb19ce8 9ce0: 8146202c 80806718 40000013 831ee2c0 85707e00 85707ee0 840e3000 85707ee8 9d00: dfb19f48 00000000 dfb19d34 840e3000 00022fe0 85707e00 82e3d400 00000001 9d20: 00000000 00000000 dfb19da4 dfb19d38 81689b58 81461f48 00000000 00000000 9d40: 00000000 85707ee0 85707ed0 7fffffff 840e3088 85707efc 840e3234 dfb19f38 9d60: 00000000 82e3d400 802a4924 00000100 00000122 1b9bd594 dfb19f38 81689a08 9d80: dfb19f38 831ee280 00000000 20000180 00000000 dfb19df4 dfb19dc4 dfb19da8 9da0: 816888a0 81689a14 00000000 00000000 20000180 81688868 dfb19de4 dfb19dc8 9dc0: 813d10ec 81688874 dfb19f38 200004c0 831ee280 00000000 dfb19ea4 dfb19de8 9de0: 813d12f0 813d10a8 00000001 00000000 dfb19e34 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 1b9bd594 00000000 00000000 9e80: dfb19f38 200004c0 00000000 831ee280 82e3d400 00000129 dfb19f24 dfb19ea8 9ea0: 813d43d4 813d126c 00000000 00000000 802873d4 00000000 20000180 200006c0 9ec0: 00022fe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1b9bd594 9f00: dfb19f24 831ee280 00000000 200004c0 00000000 8020029c dfb19fa4 dfb19f28 9f20: 813d4bb4 813d4358 00000000 dfb19f38 00000001 fffffff7 dfb19df4 00000000 9f40: 00000000 00000000 00000000 00000000 200006c0 00022fe0 00000001 00000000 9f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 9f80: 8020c910 1b9bd594 00000000 00000000 002542e0 00000129 00000000 dfb19fa8 9fa0: 80200060 813d4b4c 00000000 00000000 00000003 200004c0 00000000 00000000 9fc0: 00000000 00000000 002542e0 00000129 7e96d776 7e96d777 003d0f00 76bfb0bc 9fe0: 76bfaec8 76bfaeb8 00018374 00130460 60000010 00000003 00000000 00000000 Call trace: [<804810c4>] (__kmap_local_page_prot) from [<80806804>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<804810c4>] (__kmap_local_page_prot) from [<80806804>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<8080670c>] (copy_page_to_iter) from [<8146202c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00022fe0 r8:00000000 r7:00000000 r6:00000000 r5:8571f000 r4:8571f000 [<81461f3c>] (sk_msg_recvmsg) from [<81689b58>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461f3c>] (sk_msg_recvmsg) from [<81689b58>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:82e3d400 r6:85707e00 r5:00022fe0 r4:840e3000 [<81689a08>] (unix_bpf_recvmsg) from [<816888a0>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:dfb19df4 r9:00000000 r8:20000180 r7:00000000 r6:831ee280 r5:dfb19f38 r4:81689a08 [<81688868>] (unix_dgram_recvmsg) from [<813d10ec>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81688868>] (unix_dgram_recvmsg) from [<813d10ec>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81688868 [<813d109c>] (sock_recvmsg) from [<813d12f0>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:831ee280 r5:200004c0 r4:dfb19f38 [<813d1260>] (____sys_recvmsg) from [<813d43d4>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:82e3d400 r8:831ee280 r7:00000000 r6:200004c0 r5:dfb19f38 r4:00000000 [<813d434c>] (___sys_recvmsg) from [<813d4bb4>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d434c>] (___sys_recvmsg) from [<813d4bb4>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d434c>] (___sys_recvmsg) from [<813d4bb4>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:831ee280 [<813d4b40>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb19fa8 to 0xdfb19ff0) 9fa0: 00000000 00000000 00000003 200004c0 00000000 00000000 9fc0: 00000000 00000000 002542e0 00000129 7e96d776 7e96d777 003d0f00 76bfb0bc 9fe0: 76bfaec8 76bfaeb8 00018374 00130460 r7:00000129 r6:002542e0 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