8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=842f4003, *pmd=df9fb003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 11863 Comm: syz-executor.0 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 : [<80481510>] lr : [<80806570>] psr: 60000013 sp : dfed5ca0 ip : dfed5cb0 fp : dfed5cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 848a7800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84ff9280 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 848a7800 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 0xdfed4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfed4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.0 (pid: 11863, stack limit = 0xdfed4000) Stack: (0xdfed5ca0 to 0xdfed6000) 5ca0: dfed5ce4 dfed5cb0 80806570 80481510 dfed5cd4 dfed5f48 8024d2c4 848a7800 5cc0: 848a7800 00000000 00000001 00000000 000000c7 00000018 dfed5d34 dfed5ce8 5ce0: 81462d24 80806484 00000000 3e47cef3 84e56e00 84e56ee0 84bdf300 84e56ee8 5d00: dfed5f48 00000002 dfed5d8c 84bdf300 000000c7 84e56e00 83e50c00 00000000 5d20: 00000102 00000000 dfed5da4 dfed5d38 8168a464 81462c40 00000102 00000000 5d40: 00000000 00000000 00000000 00000000 84bdf388 84e56efc 84bdf534 dfed5f38 5d60: 00000000 3e47cef3 818f7294 821cb998 00000102 3e47cef3 dfed5f38 8168a314 5d80: dfed5f38 845dca00 00000102 00000000 00000102 dfed5df4 dfed5dc4 dfed5da8 5da0: 816891ac 8168a320 00000000 00000102 00000000 81689174 dfed5de4 dfed5dc8 5dc0: 813d1f70 81689180 dfed5f38 200004c0 845dca00 00000000 dfed5ea4 dfed5de8 5de0: 813d2174 813d1f2c 00000001 00000000 dfed5e34 00000000 00000000 00000000 5e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e60: 00000000 00000000 00000000 00000000 00000000 3e47cef3 00000000 00000000 5e80: dfed5f38 200004c0 00000102 845dca00 83e50c00 00000129 dfed5f24 dfed5ea8 5ea0: 813d5258 813d20f0 00000102 00000000 ffffffff 00000000 00000000 200002c0 5ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3e47cef3 5f00: dfed5f24 845dca00 00000000 200004c0 00000102 8020029c dfed5fa4 dfed5f28 5f20: 813d5a38 813d51dc 00000000 dfed5f38 00000001 fffffff7 dfed5df4 00000000 5f40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 5f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 5f80: 8020c910 3e47cef3 00000000 00000000 0014c2c8 00000129 00000000 dfed5fa8 5fa0: 80200060 813d59d0 00000000 00000000 00000003 200004c0 00000102 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7eb3332e 7eb3332f 003d0f00 76bf00fc 5fe0: 76beff08 76befef8 00016d28 00051560 60000010 00000003 00000000 00000000 Call trace: [<80481504>] (__kmap_local_page_prot) from [<80806570>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80481504>] (__kmap_local_page_prot) from [<80806570>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806478>] (copy_page_to_iter) from [<81462d24>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:848a7800 r4:848a7800 [<81462c34>] (sk_msg_recvmsg) from [<8168a464>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81462c34>] (sk_msg_recvmsg) from [<8168a464>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:83e50c00 r6:84e56e00 r5:000000c7 r4:84bdf300 [<8168a314>] (unix_bpf_recvmsg) from [<816891ac>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2484) r10:dfed5df4 r9:00000102 r8:00000000 r7:00000102 r6:845dca00 r5:dfed5f38 r4:8168a314 [<81689174>] (unix_dgram_recvmsg) from [<813d1f70>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81689174>] (unix_dgram_recvmsg) from [<813d1f70>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81689174 [<813d1f20>] (sock_recvmsg) from [<813d2174>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:845dca00 r5:200004c0 r4:dfed5f38 [<813d20e4>] (____sys_recvmsg) from [<813d5258>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:83e50c00 r8:845dca00 r7:00000102 r6:200004c0 r5:dfed5f38 r4:00000000 [<813d51d0>] (___sys_recvmsg) from [<813d5a38>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d51d0>] (___sys_recvmsg) from [<813d5a38>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d51d0>] (___sys_recvmsg) from [<813d5a38>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:845dca00 [<813d59c4>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfed5fa8 to 0xdfed5ff0) 5fa0: 00000000 00000000 00000003 200004c0 00000102 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7eb3332e 7eb3332f 003d0f00 76bf00fc 5fe0: 76beff08 76befef8 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