8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=87320003, *pmd=fe1e1003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 5117 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 : [<8046ad00>] lr : [<807e0824>] psr: 60000113 sp : ebb69c00 ip : ebb69c10 fp : ebb69c0c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 873db000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86926c80 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 873db000 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 0xebb68000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xebb68000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.0 (pid: 5117, stack limit = 0xebb68000) Stack: (0xebb69c00 to 0xebb6a000) 9c00: ebb69c44 ebb69c10 807e0824 8046ad00 ebb69c34 ebb69ef0 8024c610 873db000 9c20: 873db000 00000000 00000000 00000000 00000041 00000018 ebb69c94 ebb69c48 9c40: 813d8b90 807e0738 40000113 833d8cc0 86e16a00 86e16ad0 8402a400 86e16ad8 9c60: ebb69ef0 00000000 ebb69c94 8402a400 00000041 86e16a00 84164800 00000001 9c80: 00000000 00000000 ebb69d04 ebb69c98 815f5074 813d8aac 00000000 00000002 9ca0: ebb69cac 86e16ad0 86e16ac0 7fffffff 8402a4a8 86e16aec 8402a63c ebb69ee0 9cc0: 00000000 84164800 802a13b4 00000100 00000122 ae4b51f6 00000000 815f4f24 9ce0: ebb69ee0 833d8c80 00000000 00000000 00000000 ebb69d54 ebb69d24 ebb69d08 9d00: 815f43b4 815f4f30 00000000 00000000 00000000 815f437c ebb69d44 ebb69d28 9d20: 8134e21c 815f4388 ebb69ee0 833d8c80 20000d40 00000000 ebb69e04 ebb69d48 9d40: 8134e420 8134e1d8 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 ae4b51f6 00000000 00000000 9de0: ebb69ee0 20000d40 00000000 833d8c80 84164800 00000001 ebb69e84 ebb69e08 9e00: 81351354 8134e39c 00000000 00000000 81a02a84 00000000 00000000 20000500 9e20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ae4b51f6 9e60: ebb69e84 ebb69ec0 20000d40 00000000 00000000 00000000 ebb69f5c ebb69e88 9e80: 8135147c 813512d8 00000000 ebb69e98 80891c34 833d8c80 00000001 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ec0: 000f4240 ebb69ed8 000509d0 00000000 00000000 00000000 ebb69f04 ebb69ee8 9ee0: ebb69d54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 9f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 ebb69f44 ae4b51f6 8185067c 00000003 20000d40 00000000 9f40: 00000000 00000001 84164800 0000016d ebb69fa4 ebb69f60 81351e4c 81351394 9f60: 00000000 ebb69fb0 00000000 00000000 00000000 00000000 ebb69fac ae4b51f6 9f80: 8020c9bc 00000000 00000000 0014c2c8 0000016d 80200288 00000000 ebb69fa8 9fa0: 80200060 81351d94 00000000 00000000 00000003 20000d40 00000001 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7ed3232e 7ed3232f 003d0f00 76b620fc 9fe0: 76b61f08 76b61ef8 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 r5:873db000 r4:873db000 [<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 r8:00000001 r7:84164800 r6:86e16a00 r5:00000041 r4:8402a400 [<815f4f24>] (unix_bpf_recvmsg) from [<815f43b4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2485) r10:ebb69d54 r9:00000000 r8:00000000 r7:00000000 r6:833d8c80 r5:ebb69ee0 r4:815f4f24 [<815f437c>] (unix_dgram_recvmsg) from [<8134e21c>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815f437c>] (unix_dgram_recvmsg) from [<8134e21c>] (sock_recvmsg+0x50/0x78 net/socket.c:1066) r4:815f437c [<8134e1cc>] (sock_recvmsg) from [<8134e420>] (____sys_recvmsg+0x90/0x158 net/socket.c:2807) r7:00000000 r6:20000d40 r5:833d8c80 r4:ebb69ee0 [<8134e390>] (____sys_recvmsg) from [<81351354>] (___sys_recvmsg+0x88/0xbc net/socket.c:2849) r10:00000001 r9:84164800 r8:833d8c80 r7:00000000 r6:20000d40 r5:ebb69ee0 r4:00000000 [<813512cc>] (___sys_recvmsg) from [<8135147c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2943) r8:00000000 r7:00000000 r6:00000000 r5:20000d40 r4:ebb69ec0 [<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 r9:84164800 r8:00000001 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(0xebb69fa8 to 0xebb69ff0) 9fa0: 00000000 00000000 00000003 20000d40 00000001 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7ed3232e 7ed3232f 003d0f00 76b620fc 9fe0: 76b61f08 76b61ef8 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