8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8aee7003, *pmd=e0ff3003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 7602 Comm: syz-executor.1 Not tainted 6.7.0-rc8-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 : [<8046aab0>] lr : [<807e0b68>] psr: 60000013 sp : eabe1c20 ip : eabe1c30 fp : eabe1c2c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85113800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8af21940 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 85113800 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 0xeabe0000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xeabe0000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.1 (pid: 7602, stack limit = 0xeabe0000) Stack: (0xeabe1c20 to 0xeabe2000) 1c20: eabe1c64 eabe1c30 807e0b68 8046aab0 eabe1c54 eabe1ef0 8024c5d8 85113800 1c40: 85113800 00000000 00000000 00000000 00000041 00000018 eabe1cb4 eabe1c68 1c60: 813da83c 807e0a7c 00000000 850db700 8446a200 8446a2d0 847f8000 8446a2d8 1c80: eabe1ef0 00000000 806d5054 847f8000 00000041 8446a200 844e9800 00000000 1ca0: 00000000 00000000 eabe1d24 eabe1cb8 815f77dc 813da758 00000000 eabe1ee0 1cc0: 00000000 00000000 00000000 00000000 847f80a8 8446a2ec 847f823c eabe1ee0 1ce0: eabe1ee0 8482b680 00000000 00000000 00000000 d5c9e230 eabe1d24 815f768c 1d00: 8482b680 20000d60 815f6ae4 00000000 00000000 eabe1d54 eabe1d44 eabe1d28 1d20: 815f6b1c 815f7698 00000000 8482b680 20000d40 eabe1ee0 eabe1e04 eabe1d48 1d40: 8134fd4c 815f6af0 00000000 00000000 00000001 00000000 00000000 00000000 1d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1dc0: 00000000 00000000 00000000 00000000 00000000 d5c9e230 00000000 00000000 1de0: eabe1ee0 20000d60 00000000 8482b680 844e9800 00000002 eabe1e84 eabe1e08 1e00: 81352bdc 8134fc24 00000000 00000001 80313e90 00000000 00000000 20000500 1e20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 d5c9e230 1e60: eabe1e84 eabe1ec0 20000d60 00000001 00000000 00000000 eabe1f5c eabe1e88 1e80: 81352d04 81352b60 00000001 eabe1e98 8089202c 8482b680 00000001 00000000 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ec0: 00000000 00000000 00050af0 00000000 00000000 00000000 eabe1f04 eabe1ee8 1ee0: eabe1d54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 1f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 1f20: 00000000 00000000 eabe1f44 d5c9e230 81852ae8 00000003 20000d40 00000000 1f40: 00000000 00000002 844e9800 0000016d eabe1fa4 eabe1f60 813536d4 81352c1c 1f60: 00000000 eabe1fb0 00000000 00000000 00000000 00000000 eabe1fac d5c9e230 1f80: 8020c9bc 00000000 00000000 0014c2c8 0000016d 80200288 00000000 eabe1fa8 1fa0: 80200060 8135361c 00000000 00000000 00000003 20000d40 00000002 00000000 1fc0: 00000000 00000000 0014c2c8 0000016d 7ec4e32e 7ec4e32f 003d0f00 76b770fc 1fe0: 76b76f08 76b76ef8 000167a0 00050af0 60000010 00000003 00000000 00000000 Backtrace: [<8046aaa4>] (__kmap_local_page_prot) from [<807e0b68>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046aaa4>] (__kmap_local_page_prot) from [<807e0b68>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e0a70>] (copy_page_to_iter) from [<813da83c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:85113800 r4:85113800 [<813da74c>] (sk_msg_recvmsg) from [<815f77dc>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813da74c>] (sk_msg_recvmsg) from [<815f77dc>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:844e9800 r6:8446a200 r5:00000041 r4:847f8000 [<815f768c>] (unix_bpf_recvmsg) from [<815f6b1c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:eabe1d54 r9:00000000 r8:00000000 r7:815f6ae4 r6:20000d60 r5:8482b680 r4:815f768c [<815f6ae4>] (unix_dgram_recvmsg) from [<8134fd4c>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815f6ae4>] (unix_dgram_recvmsg) from [<8134fd4c>] (____sys_recvmsg+0x134/0x158 net/socket.c:2801) r4:eabe1ee0 [<8134fc18>] (____sys_recvmsg) from [<81352bdc>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:844e9800 r8:8482b680 r7:00000000 r6:20000d60 r5:eabe1ee0 r4:00000000 [<81352b54>] (___sys_recvmsg) from [<81352d04>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:eabe1ec0 [<81352c10>] (do_recvmmsg) from [<813536d4>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<81352c10>] (do_recvmmsg) from [<813536d4>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<81352c10>] (do_recvmmsg) from [<813536d4>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:844e9800 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000003 [<81353610>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xeabe1fa8 to 0xeabe1ff0) 1fa0: 00000000 00000000 00000003 20000d40 00000002 00000000 1fc0: 00000000 00000000 0014c2c8 0000016d 7ec4e32e 7ec4e32f 003d0f00 76b770fc 1fe0: 76b76f08 76b76ef8 000167a0 00050af0 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