8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85083003, *pmd=fe75d003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 3796 Comm: syz-executor.0 Not tainted 6.10.0-rc5-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 : [<80480f08>] lr : [<8080681c>] psr: 60000013 sp : dfc85d40 ip : dfc85d50 fp : dfc85d4c r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84fa0400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84d52980 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 84fa0400 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 0xdfc84000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfc84000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.0 (pid: 3796, stack limit = 0xdfc84000) Stack: (0xdfc85d40 to 0xdfc86000) 5d40: dfc85d84 dfc85d50 8080681c 80480f08 dfc85d74 dfc85ea0 8024d2c4 84fa0400 5d60: 84fa0400 00000000 00000000 00000000 00000003 00000018 dfc85dd4 dfc85d88 5d80: 81461d18 80806730 40000013 84810f40 84e9a800 84e9a8e0 82fae100 84e9a8e8 5da0: dfc85ea0 00000000 dfc85dd4 82fae100 00000003 84e9a800 844b6c00 00000001 5dc0: 00000000 00000000 dfc85e44 dfc85dd8 81689714 81461c34 00000000 00000000 5de0: 00000000 84e9a8e0 84e9a8d0 7fffffff 82fae188 84e9a8fc 82fae334 dfc85e90 5e00: 00000000 844b6c00 802a4894 00000100 00000122 a67c91ba dfc85e90 816895c4 5e20: dfc85e90 84810f00 00000000 00000000 00000000 00000003 dfc85e64 dfc85e48 5e40: 8168845c 816895d0 00000000 00000000 00000000 81688424 dfc85e84 dfc85e68 5e60: 813d0ddc 81688430 00000000 00000000 84810f00 dfc85edc dfc85f8c dfc85e88 5e80: 813d384c 813d0d98 fffffff7 00000001 00000000 00000000 00000000 00000000 5ea0: 00000000 00000000 20000240 00000003 00000001 00000000 00000000 00000000 5ec0: 00000000 00000000 00000000 00000000 00000000 00000000 dfc85f04 00000000 5ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5f00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5f40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 a67c91ba 5f60: 8261c90c 00000000 00000000 001542d4 00000124 8020029c 844b6c00 00000124 5f80: dfc85fa4 dfc85f90 813d38e8 813d3790 00000000 00000000 00000000 dfc85fa8 5fa0: 80200060 813d38d8 00000000 00000000 00000005 20000240 00000003 00000000 5fc0: 00000000 00000000 001542d4 00000124 7ec3f336 7ec3f337 003d0f00 76b9a0fc 5fe0: 76b99f08 76b99ef8 00016f30 000516d0 60000010 00000005 00000000 00000000 Call trace: [<80480efc>] (__kmap_local_page_prot) from [<8080681c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80480efc>] (__kmap_local_page_prot) from [<8080681c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806724>] (copy_page_to_iter) from [<81461d18>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000003 r8:00000000 r7:00000000 r6:00000000 r5:84fa0400 r4:84fa0400 [<81461c28>] (sk_msg_recvmsg) from [<81689714>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461c28>] (sk_msg_recvmsg) from [<81689714>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:844b6c00 r6:84e9a800 r5:00000003 r4:82fae100 [<816895c4>] (unix_bpf_recvmsg) from [<8168845c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:00000003 r9:00000000 r8:00000000 r7:00000000 r6:84810f00 r5:dfc85e90 r4:816895c4 [<81688424>] (unix_dgram_recvmsg) from [<813d0ddc>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81688424>] (unix_dgram_recvmsg) from [<813d0ddc>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81688424 [<813d0d8c>] (sock_recvmsg) from [<813d384c>] (__sys_recvfrom+0xc8/0x148 net/socket.c:2243) r7:dfc85edc r6:84810f00 r5:00000000 r4:00000000 [<813d3784>] (__sys_recvfrom) from [<813d38e8>] (__do_sys_recvfrom net/socket.c:2261 [inline]) [<813d3784>] (__sys_recvfrom) from [<813d38e8>] (sys_recvfrom+0x1c/0x24 net/socket.c:2257) r10:00000124 r9:844b6c00 r8:8020029c r7:00000124 r6:001542d4 r5:00000000 r4:00000000 [<813d38cc>] (sys_recvfrom) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc85fa8 to 0xdfc85ff0) 5fa0: 00000000 00000000 00000005 20000240 00000003 00000000 5fc0: 00000000 00000000 001542d4 00000124 7ec3f336 7ec3f337 003d0f00 76b9a0fc 5fe0: 76b99f08 76b99ef8 00016f30 000516d0 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