8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8776f003, *pmd=e4344003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 11194 Comm: syz-executor.1 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 : [<8046ad00>] lr : [<807e0824>] psr: 60000013 sp : dfc85c20 ip : dfc85c30 fp : dfc85c2c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 876e9c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 843ab180 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 876e9c00 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/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xdfc84000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.1 (pid: 11194, stack limit = 0xdfc84000) Stack: (0xdfc85c20 to 0xdfc86000) 5c20: dfc85c64 dfc85c30 807e0824 8046ad00 dfc85c54 dfc85ef0 8024c610 876e9c00 5c40: 876e9c00 00000000 00000000 00000000 00000041 00000018 dfc85cb4 dfc85c68 5c60: 813d8b90 807e0738 00000000 843dc480 87ce7800 87ce78d0 83e70c00 87ce78d8 5c80: dfc85ef0 00000000 806d4ef0 83e70c00 00000041 87ce7800 835ee000 00000000 5ca0: 00000000 00000000 dfc85d24 dfc85cb8 815f5074 813d8aac 00000000 dfc85ee0 5cc0: 00000000 00000000 00000000 00000000 83e70ca8 87ce78ec 83e70e3c dfc85ee0 5ce0: dfc85ee0 833b8000 00000000 00000000 00000000 60d05fd3 dfc85d24 815f4f24 5d00: 833b8000 20000d60 815f437c 00000000 00000000 dfc85d54 dfc85d44 dfc85d28 5d20: 815f43b4 815f4f30 00000000 833b8000 20000d40 dfc85ee0 dfc85e04 dfc85d48 5d40: 8134e4c4 815f4388 00000000 00000000 00000001 00000000 00000000 00000000 5d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5dc0: 00000000 00000000 00000000 00000000 00000000 60d05fd3 00000000 00000000 5de0: dfc85ee0 20000d60 00000000 833b8000 835ee000 00000002 dfc85e84 dfc85e08 5e00: 81351354 8134e39c 00000000 00000001 80314400 00000000 00000000 20000500 5e20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 60d05fd3 5e60: dfc85e84 dfc85ec0 20000d60 00000001 00000000 00000000 dfc85f5c dfc85e88 5e80: 8135147c 813512d8 00000001 dfc85e98 80891c34 833b8000 00000001 00000000 5ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ec0: 00000000 00000000 000509d0 00000000 00000000 00000000 dfc85f04 dfc85ee8 5ee0: dfc85d54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 5f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 dfc85f44 60d05fd3 8185067c 00000003 20000d40 00000000 5f40: 00000000 00000002 835ee000 0000016d dfc85fa4 dfc85f60 81351e4c 81351394 5f60: 00000000 dfc85fb0 00000000 00000000 00000000 00000000 dfc85fac 60d05fd3 5f80: 8020c9bc 00000000 00000000 0014c2c8 0000016d 80200288 00000000 dfc85fa8 5fa0: 80200060 81351d94 00000000 00000000 00000003 20000d40 00000002 00000000 5fc0: 00000000 00000000 0014c2c8 0000016d 7ef7c32e 7ef7c32f 003d0f00 76bf50fc 5fe0: 76bf4f08 76bf4ef8 00016680 000509d0 60000010 00000003 00000000 00000000 Backtrace: [<8046acf4>] (__kmap_local_page_prot) from [<807e0824>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046acf4>] (__kmap_local_page_prot) from [<807e0824>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e072c>] (copy_page_to_iter) from [<813d8b90>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:876e9c00 r4:876e9c00 [<813d8aa0>] (sk_msg_recvmsg) from [<815f5074>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d8aa0>] (sk_msg_recvmsg) from [<815f5074>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:835ee000 r6:87ce7800 r5:00000041 r4:83e70c00 [<815f4f24>] (unix_bpf_recvmsg) from [<815f43b4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2485) r10:dfc85d54 r9:00000000 r8:00000000 r7:815f437c r6:20000d60 r5:833b8000 r4:815f4f24 [<815f437c>] (unix_dgram_recvmsg) from [<8134e4c4>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815f437c>] (unix_dgram_recvmsg) from [<8134e4c4>] (____sys_recvmsg+0x134/0x158 net/socket.c:2805) r4:dfc85ee0 [<8134e390>] (____sys_recvmsg) from [<81351354>] (___sys_recvmsg+0x88/0xbc net/socket.c:2849) r10:00000002 r9:835ee000 r8:833b8000 r7:00000000 r6:20000d60 r5:dfc85ee0 r4:00000000 [<813512cc>] (___sys_recvmsg) from [<8135147c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2943) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:dfc85ec0 [<81351388>] (do_recvmmsg) from [<81351e4c>] (__sys_recvmmsg net/socket.c:3022 [inline]) [<81351388>] (do_recvmmsg) from [<81351e4c>] (__do_sys_recvmmsg_time32 net/socket.c:3056 [inline]) [<81351388>] (do_recvmmsg) from [<81351e4c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3049) r10:0000016d r9:835ee000 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000003 [<81351d88>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfc85fa8 to 0xdfc85ff0) 5fa0: 00000000 00000000 00000003 20000d40 00000002 00000000 5fc0: 00000000 00000000 0014c2c8 0000016d 7ef7c32e 7ef7c32f 003d0f00 76bf50fc 5fe0: 76bf4f08 76bf4ef8 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