8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=84bad003, *pmd=fdd5c003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 8225 Comm: syz-executor.0 Not tainted 6.8.0-rc1-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 : [<8046cedc>] lr : [<807d34d0>] psr: 60000013 sp : dfa21c00 ip : dfa21c10 fp : dfa21c0c r10: 00000018 r9 : 8284f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 852b9400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8547c580 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 852b9400 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 0xdfa20000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xdfa20000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.0 (pid: 8225, stack limit = 0xdfa20000) Stack: (0xdfa21c00 to 0xdfa22000) 1c00: dfa21c44 dfa21c10 807d34d0 8046cedc dfa21c34 dfa21ef0 8024c824 852b9400 1c20: 852b9400 00000000 00000000 00000000 000000ac 00000018 dfa21c94 dfa21c48 1c40: 813d84fc 807d33e4 00000000 04122dd9 848f5800 848f58d0 82fbd800 848f58d8 1c60: dfa21ef0 00000000 dfa21cec 82fbd800 000000ac 848f5800 82fda400 00000000 1c80: 00000000 00000000 dfa21d04 dfa21c98 815f6240 813d8418 00000000 00000000 1ca0: 00000000 00000000 00000000 00000000 82fbd8a8 848f58ec 82fbda34 dfa21ee0 1cc0: 00000000 04122dd9 01d8fdc3 821907f4 00000000 04122dd9 dfa21ee0 815f60f0 1ce0: dfa21ee0 84c8a500 00000000 00000000 00000000 dfa21d54 dfa21d24 dfa21d08 1d00: 815f5580 815f60fc 00000000 00000000 00000000 815f5548 dfa21d44 dfa21d28 1d20: 8134b880 815f5554 dfa21ee0 84c8a500 20001040 00000000 dfa21e04 dfa21d48 1d40: 8134ba84 8134b83c 00000007 00000000 00000000 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 04122dd9 00000000 00000000 1de0: dfa21ee0 20001040 00000000 84c8a500 82fda400 00000001 dfa21e84 dfa21e08 1e00: 8134e99c 8134ba00 00000000 00000000 80314bf0 00000000 00000000 200006c0 1e20: 000000ac 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 04122dd9 1e60: dfa21e84 dfa21ec0 20001040 00000000 00000000 00000000 dfa21f5c dfa21e88 1e80: 8134eac4 8134e920 00000000 dfa21e98 80884a30 84c8a500 00000001 00000000 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ec0: 00000000 00000000 00050bd0 00000000 00000000 00000000 dfa21f04 dfa21ee8 1ee0: dfa21d54 00000000 00000000 00000000 00000001 00000000 dfa21e1c 000000ac 1f00: 00000007 00000000 00000000 00000001 00000000 00000000 00000000 00000000 1f20: 00000000 00000000 dfa21f44 04122dd9 81854438 00000003 20001040 00000000 1f40: 00000000 00000001 82fda400 0000016d dfa21fa4 dfa21f60 8134f494 8134e9dc 1f60: 00000000 dfa21fb0 00000000 00000000 00000000 00000000 dfa21fac 04122dd9 1f80: 8020ca34 00000000 00000000 0014c2d0 0000016d 80200288 00000000 dfa21fa8 1fa0: 80200060 8134f3dc 00000000 00000000 00000003 20001040 00000001 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7e876326 7e876327 003d0f00 76be20fc 1fe0: 76be1f08 76be1ef8 000167e8 00050bd0 60000010 00000003 00000000 00000000 Backtrace: [<8046ced0>] (__kmap_local_page_prot) from [<807d34d0>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046ced0>] (__kmap_local_page_prot) from [<807d34d0>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d33d8>] (copy_page_to_iter) from [<813d84fc>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000ac r8:00000000 r7:00000000 r6:00000000 r5:852b9400 r4:852b9400 [<813d840c>] (sk_msg_recvmsg) from [<815f6240>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d840c>] (sk_msg_recvmsg) from [<815f6240>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:82fda400 r6:848f5800 r5:000000ac r4:82fbd800 [<815f60f0>] (unix_bpf_recvmsg) from [<815f5580>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:dfa21d54 r9:00000000 r8:00000000 r7:00000000 r6:84c8a500 r5:dfa21ee0 r4:815f60f0 [<815f5548>] (unix_dgram_recvmsg) from [<8134b880>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f5548>] (unix_dgram_recvmsg) from [<8134b880>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f5548 [<8134b830>] (sock_recvmsg) from [<8134ba84>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20001040 r5:84c8a500 r4:dfa21ee0 [<8134b9f4>] (____sys_recvmsg) from [<8134e99c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:82fda400 r8:84c8a500 r7:00000000 r6:20001040 r5:dfa21ee0 r4:00000000 [<8134e914>] (___sys_recvmsg) from [<8134eac4>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20001040 r4:dfa21ec0 [<8134e9d0>] (do_recvmmsg) from [<8134f494>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8134e9d0>] (do_recvmmsg) from [<8134f494>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8134e9d0>] (do_recvmmsg) from [<8134f494>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:82fda400 r8:00000001 r7:00000000 r6:00000000 r5:20001040 r4:00000003 [<8134f3d0>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfa21fa8 to 0xdfa21ff0) 1fa0: 00000000 00000000 00000003 20001040 00000001 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7e876326 7e876327 003d0f00 76be20fc 1fe0: 76be1f08 76be1ef8 000167e8 00050bd0 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