8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=9428f003, *pmd=fc309003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 29475 Comm: syz-executor.1 Not tainted 6.8.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1097 [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 : [<8046d074>] lr : [<807d3180>] psr: 60000013 sp : ebfe1c00 ip : ebfe1c10 fp : ebfe1c0c r10: 00000018 r9 : 8284f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8427b800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 87522700 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 8427b800 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 0xebfe0000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xebfe0000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.1 (pid: 29475, stack limit = 0xebfe0000) Stack: (0xebfe1c00 to 0xebfe2000) 1c00: ebfe1c44 ebfe1c10 807d3180 8046d074 ebfe1c34 ebfe1ef0 8024c824 8427b800 1c20: 8427b800 00000000 00000000 00000000 00000072 00000018 ebfe1c94 ebfe1c48 1c40: 813d8574 807d3094 00000000 ee3be87f 83b8e000 83b8e0d0 83ce6a00 83b8e0d8 1c60: ebfe1ef0 00000000 ebfe1cec 83ce6a00 00000072 83b8e000 8476ec00 00000000 1c80: 00000000 00000000 ebfe1d04 ebfe1c98 815f67b8 813d8490 00000000 00000000 1ca0: 00000000 00000000 00000000 00000000 83ce6aa8 83b8e0ec 83ce6c34 ebfe1ee0 1cc0: 00000000 ee3be87f 01fa7286 821907f4 00000000 ee3be87f ebfe1ee0 815f6668 1ce0: ebfe1ee0 83373400 00000000 00000000 00000000 ebfe1d54 ebfe1d24 ebfe1d08 1d00: 815f5af8 815f6674 00000000 00000000 00000000 815f5ac0 ebfe1d44 ebfe1d28 1d20: 8134b630 815f5acc ebfe1ee0 83373400 20001240 00000000 ebfe1e04 ebfe1d48 1d40: 8134b834 8134b5ec 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 ee3be87f 00000000 00000000 1de0: ebfe1ee0 20001240 00000000 83373400 8476ec00 00000001 ebfe1e84 ebfe1e08 1e00: 8134e74c 8134b7b0 00000000 00000000 80314d50 00000000 00000000 20000940 1e20: 00000072 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ee3be87f 1e60: ebfe1e84 ebfe1ec0 20001240 00000000 00000000 00000000 ebfe1f5c ebfe1e88 1e80: 8134e874 8134e6d0 00000000 ebfe1e98 808846e0 83373400 00000001 00000000 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ec0: 00000000 00000000 00050bb0 00000000 00000000 00000000 ebfe1f04 ebfe1ee8 1ee0: ebfe1d54 00000000 00000000 00000000 00000000 00000000 20000940 00000072 1f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 1f20: 00000000 00000000 ebfe1f44 ee3be87f 81854ab8 00000003 20001240 00000000 1f40: 00000000 00000001 8476ec00 0000016d ebfe1fa4 ebfe1f60 8134f244 8134e78c 1f60: 00000000 ebfe1fb0 00000000 00000000 00000000 00000000 ebfe1fac ee3be87f 1f80: 8020ca34 00000000 00000000 0014c2d0 0000016d 80200288 00000000 ebfe1fa8 1fa0: 80200060 8134f18c 00000000 00000000 00000003 20001240 00000001 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7e8d532e 7e8d532f 003d0f00 76ba50fc 1fe0: 76ba4f08 76ba4ef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d068>] (__kmap_local_page_prot) from [<807d3180>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d068>] (__kmap_local_page_prot) from [<807d3180>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d3088>] (copy_page_to_iter) from [<813d8574>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000072 r8:00000000 r7:00000000 r6:00000000 r5:8427b800 r4:8427b800 [<813d8484>] (sk_msg_recvmsg) from [<815f67b8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d8484>] (sk_msg_recvmsg) from [<815f67b8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:8476ec00 r6:83b8e000 r5:00000072 r4:83ce6a00 [<815f6668>] (unix_bpf_recvmsg) from [<815f5af8>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:ebfe1d54 r9:00000000 r8:00000000 r7:00000000 r6:83373400 r5:ebfe1ee0 r4:815f6668 [<815f5ac0>] (unix_dgram_recvmsg) from [<8134b630>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f5ac0>] (unix_dgram_recvmsg) from [<8134b630>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f5ac0 [<8134b5e0>] (sock_recvmsg) from [<8134b834>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20001240 r5:83373400 r4:ebfe1ee0 [<8134b7a4>] (____sys_recvmsg) from [<8134e74c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:8476ec00 r8:83373400 r7:00000000 r6:20001240 r5:ebfe1ee0 r4:00000000 [<8134e6c4>] (___sys_recvmsg) from [<8134e874>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20001240 r4:ebfe1ec0 [<8134e780>] (do_recvmmsg) from [<8134f244>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8134e780>] (do_recvmmsg) from [<8134f244>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8134e780>] (do_recvmmsg) from [<8134f244>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:8476ec00 r8:00000001 r7:00000000 r6:00000000 r5:20001240 r4:00000003 [<8134f180>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xebfe1fa8 to 0xebfe1ff0) 1fa0: 00000000 00000000 00000003 20001240 00000001 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7e8d532e 7e8d532f 003d0f00 76ba50fc 1fe0: 76ba4f08 76ba4ef8 000167e8 00050bb0 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