8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85369003, *pmd=fedfa003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 4980 Comm: syz-executor.0 Not tainted 6.9.0-rc6-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1100 [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 : [<8047a224>] lr : [<807e9cbc>] psr: 60000113 sp : dfda5ca0 ip : dfda5cb0 fp : dfda5cac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84f6a400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85105480 DAC: fffffffd 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 84f6a400 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 0xdfda4000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfda4000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.0 (pid: 4980, stack limit = 0xdfda4000) Stack: (0xdfda5ca0 to 0xdfda6000) 5ca0: dfda5ce4 dfda5cb0 807e9cbc 8047a224 dfda5cd4 dfda5f48 8024c860 84f6a400 5cc0: 84f6a400 00000000 00000000 00000000 00011fe0 00000018 dfda5d34 dfda5ce8 5ce0: 81433d0c 807e9bd0 40000113 848c5bc0 85395400 853954d0 852e3900 853954d8 5d00: dfda5f48 00000000 dfda5d34 852e3900 00011fe0 85395400 85210000 00000001 5d20: 00000000 00000000 dfda5da4 dfda5d38 81656a18 81433c28 00000000 00000000 5d40: 00000000 853954d0 853954c0 7fffffff 852e3988 853954ec 852e3b34 dfda5f38 5d60: 00000000 85210000 802a302c 00000100 00000122 8efe173c dfda5f38 816568c8 5d80: dfda5f38 848c5b80 00000000 00000000 00000000 dfda5df4 dfda5dc4 dfda5da8 5da0: 81655a94 816568d4 00000000 00000000 00000000 81655a5c dfda5de4 dfda5dc8 5dc0: 813a335c 81655a68 dfda5f38 848c5b80 200004c0 00000000 dfda5ea4 dfda5de8 5de0: 813a355c 813a3318 00000000 00000000 00000001 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 8efe173c 00000000 00000000 5e80: dfda5f38 200004c0 00000000 848c5b80 85210000 00000129 dfda5f24 dfda5ea8 5ea0: 813a64a0 813a34d8 00000000 00000000 00000008 00000000 00000000 20002c40 5ec0: 00011fe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8efe173c 5f00: dfda5f24 848c5b80 00000000 200004c0 00000000 80200288 dfda5fa4 dfda5f28 5f20: 813a6c1c 813a6424 00000000 dfda5f38 00000001 fffffff7 dfda5df4 00000000 5f40: 00000000 00000000 00000000 00000000 20002c40 00011fe0 00000001 00000000 5f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 5f80: 8020ca6c 8efe173c 00000000 00000000 0014c2c8 00000129 00000000 dfda5fa8 5fa0: 80200060 813a6bb4 00000000 00000000 00000004 200004c0 00000000 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7e83832e 7e83832f 003d0f00 76ba50fc 5fe0: 76ba4f08 76ba4ef8 00016ab0 00050bf0 60000010 00000004 00000000 00000000 Call trace: [<8047a218>] (__kmap_local_page_prot) from [<807e9cbc>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a218>] (__kmap_local_page_prot) from [<807e9cbc>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9bc4>] (copy_page_to_iter) from [<81433d0c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00011fe0 r8:00000000 r7:00000000 r6:00000000 r5:84f6a400 r4:84f6a400 [<81433c1c>] (sk_msg_recvmsg) from [<81656a18>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81433c1c>] (sk_msg_recvmsg) from [<81656a18>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:85210000 r6:85395400 r5:00011fe0 r4:852e3900 [<816568c8>] (unix_bpf_recvmsg) from [<81655a94>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfda5df4 r9:00000000 r8:00000000 r7:00000000 r6:848c5b80 r5:dfda5f38 r4:816568c8 [<81655a5c>] (unix_dgram_recvmsg) from [<813a335c>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81655a5c>] (unix_dgram_recvmsg) from [<813a335c>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81655a5c [<813a330c>] (sock_recvmsg) from [<813a355c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:848c5b80 r4:dfda5f38 [<813a34cc>] (____sys_recvmsg) from [<813a64a0>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:85210000 r8:848c5b80 r7:00000000 r6:200004c0 r5:dfda5f38 r4:00000000 [<813a6418>] (___sys_recvmsg) from [<813a6c1c>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a6418>] (___sys_recvmsg) from [<813a6c1c>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a6418>] (___sys_recvmsg) from [<813a6c1c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:200004c0 r5:00000000 r4:848c5b80 [<813a6ba8>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfda5fa8 to 0xdfda5ff0) 5fa0: 00000000 00000000 00000004 200004c0 00000000 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7e83832e 7e83832f 003d0f00 76ba50fc 5fe0: 76ba4f08 76ba4ef8 00016ab0 00050bf0 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