8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8fc4c003, *pmd=df279003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 10022 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1105 [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 : [<8046b068>] lr : [<807e0dc4>] psr: 60000013 sp : ecb79c00 ip : ecb79c10 fp : ecb79c0c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 9ad0cc00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8fc19e00 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 9ad0cc00 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 0xecb78000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xecb78000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.0 (pid: 10022, stack limit = 0xecb78000) Stack: (0xecb79c00 to 0xecb7a000) 9c00: ecb79c44 ecb79c10 807e0dc4 8046b068 ecb79c34 ecb79ef0 8024c610 9ad0cc00 9c20: 9ad0cc00 00000000 00000001 00000000 00000038 00000018 ecb79c94 ecb79c48 9c40: 813d9650 807e0cd8 0000ffd0 8471c000 9a8f5600 9a8f56d0 83c1f300 9a8f56d8 9c60: ecb79ef0 00000000 00000000 83c1f300 00000038 9a8f5600 8704d400 00000000 9c80: 00000000 00000000 ecb79d04 ecb79c98 815f5e1c 813d956c 00000000 00000002 9ca0: ecb79cac 00000000 00000000 00000000 83c1f3a8 9a8f56ec 83c1f53c ecb79ee0 9cc0: 00000000 00000000 00000000 00000000 00000000 5090364c 00000000 815f5ccc 9ce0: ecb79ee0 86d78a00 00000000 00000000 00000000 ecb79d54 ecb79d24 ecb79d08 9d00: 815f515c 815f5cd8 00000000 00000000 00000000 815f5124 ecb79d44 ecb79d28 9d20: 8134ecdc 815f5130 ecb79ee0 86d78a00 20000500 00000000 ecb79e04 ecb79d48 9d40: 8134eee0 8134ec98 00000000 00000000 00000001 00000000 00000000 00000000 9d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9dc0: 00000000 00000000 00000000 00000000 00000000 5090364c 00000000 00000000 9de0: ecb79ee0 20000500 00000000 86d78a00 8704d400 00000001 ecb79e84 ecb79e08 9e00: 81351e14 8134ee5c 00000000 00000000 80314738 00000000 00000000 20000040 9e20: 00000038 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5090364c 9e60: ecb79e84 ecb79ec0 20000500 00000000 00000000 00000000 ecb79f5c ecb79e88 9e80: 81351f3c 81351d98 00000000 ecb79e98 808921d4 86d78a00 00000001 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ec0: 00000000 00000000 000509d0 00000000 00000000 00000000 ecb79f04 ecb79ee8 9ee0: ecb79d54 00000000 00000000 00000000 00000000 00000001 20000040 00000037 9f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 ecb79f44 5090364c 81851664 00000003 20000500 00000000 9f40: 00000000 00000001 8704d400 0000016d ecb79fa4 ecb79f60 8135290c 81351e54 9f60: 00000000 ecb79fb0 00000000 00000000 00000000 00000000 ecb79fac 5090364c 9f80: 8020c9bc 00000000 00000000 0014c2c8 0000016d 80200288 00000000 ecb79fa8 9fa0: 80200060 81352854 00000000 00000000 00000003 20000500 00000001 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7ed7a32e 7ed7a32f 003d0f00 76bb40fc 9fe0: 76bb3f08 76bb3ef8 00016680 000509d0 60000010 00000003 00000000 00000000 Backtrace: [<8046b05c>] (__kmap_local_page_prot) from [<807e0dc4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046b05c>] (__kmap_local_page_prot) from [<807e0dc4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e0ccc>] (copy_page_to_iter) from [<813d9650>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000038 r8:00000000 r7:00000001 r6:00000000 r5:9ad0cc00 r4:9ad0cc00 [<813d9560>] (sk_msg_recvmsg) from [<815f5e1c>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d9560>] (sk_msg_recvmsg) from [<815f5e1c>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:8704d400 r6:9a8f5600 r5:00000038 r4:83c1f300 [<815f5ccc>] (unix_bpf_recvmsg) from [<815f515c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2485) r10:ecb79d54 r9:00000000 r8:00000000 r7:00000000 r6:86d78a00 r5:ecb79ee0 r4:815f5ccc [<815f5124>] (unix_dgram_recvmsg) from [<8134ecdc>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815f5124>] (unix_dgram_recvmsg) from [<8134ecdc>] (sock_recvmsg+0x50/0x78 net/socket.c:1066) r4:815f5124 [<8134ec8c>] (sock_recvmsg) from [<8134eee0>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000500 r5:86d78a00 r4:ecb79ee0 [<8134ee50>] (____sys_recvmsg) from [<81351e14>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:8704d400 r8:86d78a00 r7:00000000 r6:20000500 r5:ecb79ee0 r4:00000000 [<81351d8c>] (___sys_recvmsg) from [<81351f3c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20000500 r4:ecb79ec0 [<81351e48>] (do_recvmmsg) from [<8135290c>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<81351e48>] (do_recvmmsg) from [<8135290c>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<81351e48>] (do_recvmmsg) from [<8135290c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:8704d400 r8:00000001 r7:00000000 r6:00000000 r5:20000500 r4:00000003 [<81352848>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xecb79fa8 to 0xecb79ff0) 9fa0: 00000000 00000000 00000003 20000500 00000001 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7ed7a32e 7ed7a32f 003d0f00 76bb40fc 9fe0: 76bb3f08 76bb3ef8 00016680 000509d0 r8:80200288 r7:0000016d 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