8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8505c003, *pmd=ece88003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 6545 Comm: syz-executor.1 Not tainted 6.7.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1109 [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:379 pc : [<8046aac8>] lr : [<807e2350>] psr: 60000013 sp : dfd85c00 ip : dfd85c10 fp : dfd85c0c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84ed7400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84f5ef40 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 84ed7400 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 0xdfd84000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xdfd84000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.1 (pid: 6545, stack limit = 0xdfd84000) Stack: (0xdfd85c00 to 0xdfd86000) 5c00: dfd85c44 dfd85c10 807e2350 8046aac8 dfd85c34 dfd85ef0 8024c5d8 84ed7400 5c20: 84ed7400 00000000 00000001 00000000 00000038 00000018 dfd85c94 dfd85c48 5c40: 813dbff8 807e2264 813db548 802de3a4 84db2200 84db22d0 84c48000 84db22d8 5c60: dfd85ef0 00000002 00000000 84c48000 00000038 84db2200 84496000 00000000 5c80: 00000007 00000000 dfd85d04 dfd85c98 815f8fbc 813dbf14 00000007 00000002 5ca0: dfd85cac 00000000 00000000 00000000 84c480a8 84db22ec 84c4823c dfd85ee0 5cc0: 00000000 00000000 00000000 00000000 00000000 9ee37a85 00000000 815f8e6c 5ce0: dfd85ee0 833dd400 00000007 00000000 00000007 dfd85d54 dfd85d24 dfd85d08 5d00: 815f82fc 815f8e78 00000000 00000007 00000000 815f82c4 dfd85d44 dfd85d28 5d20: 813511fc 815f82d0 dfd85ee0 833dd400 200003c0 00000000 dfd85e04 dfd85d48 5d40: 81351400 813511b8 00000000 00000000 00000001 00000000 00000000 00000000 5d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5dc0: 00000000 00000000 00000000 00000000 00000000 9ee37a85 00000000 00000000 5de0: dfd85ee0 200003c0 00000007 833dd400 84496000 00000001 dfd85e84 dfd85e08 5e00: 81354318 8135137c 00000007 00000000 81a02a84 00000000 00000000 20000040 5e20: 00000038 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ee37a85 5e60: dfd85e84 dfd85ec0 200003c0 00000000 00000007 00000000 dfd85f5c dfd85e88 5e80: 81354440 8135429c 00000000 dfd85e98 80893814 833dd400 00000001 00000000 5ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ec0: 000f4240 dfd85ed8 00050b40 00000000 00000000 00000000 dfd85f04 dfd85ee8 5ee0: dfd85d54 00000000 00000000 00000000 00000000 00000001 20000040 00000037 5f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 dfd85f44 9ee37a85 81854328 00000003 200003c0 00000000 5f40: 00000007 00000001 84496000 0000016d dfd85fa4 dfd85f60 81354e10 81354358 5f60: 00000000 dfd85fb0 00000000 00000000 00000000 00000000 dfd85fac 9ee37a85 5f80: 8020c9bc 00000000 00000000 0014c2d0 0000016d 80200288 00000000 dfd85fa8 5fa0: 80200060 81354d58 00000000 00000000 00000003 200003c0 00000001 00000007 5fc0: 00000000 00000000 0014c2d0 0000016d 7e81b32e 7e81b32f 003d0f00 76bd60fc 5fe0: 76bd5f08 76bd5ef8 000167d0 00050b40 60000010 00000003 00000000 00000000 Backtrace: [<8046aabc>] (__kmap_local_page_prot) from [<807e2350>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046aabc>] (__kmap_local_page_prot) from [<807e2350>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e2258>] (copy_page_to_iter) from [<813dbff8>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000038 r8:00000000 r7:00000001 r6:00000000 r5:84ed7400 r4:84ed7400 [<813dbf08>] (sk_msg_recvmsg) from [<815f8fbc>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813dbf08>] (sk_msg_recvmsg) from [<815f8fbc>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000007 r8:00000000 r7:84496000 r6:84db2200 r5:00000038 r4:84c48000 [<815f8e6c>] (unix_bpf_recvmsg) from [<815f82fc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:dfd85d54 r9:00000007 r8:00000000 r7:00000007 r6:833dd400 r5:dfd85ee0 r4:815f8e6c [<815f82c4>] (unix_dgram_recvmsg) from [<813511fc>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f82c4>] (unix_dgram_recvmsg) from [<813511fc>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f82c4 [<813511ac>] (sock_recvmsg) from [<81351400>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200003c0 r5:833dd400 r4:dfd85ee0 [<81351370>] (____sys_recvmsg) from [<81354318>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:84496000 r8:833dd400 r7:00000007 r6:200003c0 r5:dfd85ee0 r4:00000000 [<81354290>] (___sys_recvmsg) from [<81354440>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000007 r6:00000000 r5:200003c0 r4:dfd85ec0 [<8135434c>] (do_recvmmsg) from [<81354e10>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8135434c>] (do_recvmmsg) from [<81354e10>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8135434c>] (do_recvmmsg) from [<81354e10>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84496000 r8:00000001 r7:00000007 r6:00000000 r5:200003c0 r4:00000003 [<81354d4c>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfd85fa8 to 0xdfd85ff0) 5fa0: 00000000 00000000 00000003 200003c0 00000001 00000007 5fc0: 00000000 00000000 0014c2d0 0000016d 7e81b32e 7e81b32f 003d0f00 76bd60fc 5fe0: 76bd5f08 76bd5ef8 000167d0 00050b40 r8:80200288 r7:0000016d r6:0014c2d0 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