================================================================== BUG: KASAN: stack-out-of-bounds in skb_splice_from_iter+0xcd6/0xd70 net/core/skbuff.c:6793 Read of size 8 at addr ffffc90015fff8f8 by task syz-executor.0/8205 CPU: 1 PID: 8205 Comm: syz-executor.0 Not tainted 6.4.0-rc6-next-20230616-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 skb_splice_from_iter+0xcd6/0xd70 net/core/skbuff.c:6793 __ip_append_data+0x144f/0x3c80 net/ipv4/ip_output.c:1211 ip_append_data net/ipv4/ip_output.c:1351 [inline] ip_append_data+0x115/0x1a0 net/ipv4/ip_output.c:1330 raw_sendmsg+0xb50/0x30a0 net/ipv4/raw.c:641 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xde/0x190 net/socket.c:748 splice_to_socket+0x954/0xe30 fs/splice.c:885 do_splice_from fs/splice.c:937 [inline] do_splice+0xb8a/0x1f30 fs/splice.c:1298 __do_splice+0x14e/0x270 fs/splice.c:1376 __do_sys_splice fs/splice.c:1587 [inline] __se_sys_splice fs/splice.c:1569 [inline] __x64_sys_splice+0x19c/0x250 fs/splice.c:1569 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f606f68c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f60703c1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f606f7ac120 RCX: 00007f606f68c389 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f606f6d7493 R08: 0000000000008002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcd347885f R14: 00007f60703c1300 R15: 0000000000022000 The buggy address belongs to stack of task syz-executor.0/8205 and is located at offset 408 in frame: raw_sendmsg+0x0/0x30a0 include/net/sock.h:2733 This frame has 8 objects: [48, 52) 'hdrincl' [64, 68) 'err' [80, 88) 'rt' [112, 152) 'ipc' [192, 240) 'state' [272, 336) 'fl4' [368, 392) 'rfv' [432, 504) 'opt_copy' The buggy address belongs to the virtual mapping at [ffffc90015ff8000, ffffc90016001000) created by: kernel_clone+0xeb/0x890 kernel/fork.c:2911 The buggy address belongs to the physical page: page:ffffea00009ea300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27a8c memcg:ffff888065c95102 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff888065c95102 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 5064, tgid 5064 (syz-executor.1), ts 454303931321, free_ts 334633958388 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0xfc2/0x2b00 mm/page_alloc.c:3257 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4513 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 vm_area_alloc_pages mm/vmalloc.c:3059 [inline] __vmalloc_area_node mm/vmalloc.c:3135 [inline] __vmalloc_node_range+0xb73/0x14b0 mm/vmalloc.c:3316 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct kernel/fork.c:1112 [inline] copy_process+0x13bb/0x75c0 kernel/fork.c:2329 kernel_clone+0xeb/0x890 kernel/fork.c:2911 __do_sys_clone+0xba/0x100 kernel/fork.c:3054 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x4dd/0xb90 mm/page_alloc.c:2384 free_unref_page+0x33/0x370 mm/page_alloc.c:2479 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc_lru+0x215/0x610 mm/slub.c:3501 alloc_inode_sb include/linux/fs.h:2719 [inline] shmem_alloc_inode+0x27/0x50 mm/shmem.c:4059 alloc_inode+0x61/0x230 fs/inode.c:260 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x2b/0x280 fs/inode.c:1046 shmem_get_inode+0x1a3/0xe40 mm/shmem.c:2387 shmem_mknod+0x66/0x220 mm/shmem.c:3091 lookup_open.isra.0+0x1050/0x1400 fs/namei.c:3492 open_last_lookups fs/namei.c:3560 [inline] path_openat+0x969/0x2710 fs/namei.c:3790 do_filp_open+0x1ba/0x410 fs/namei.c:3820 do_sys_openat2+0x160/0x1c0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1432 Memory state around the buggy address: ffffc90015fff780: f1 f1 04 f2 00 00 00 f2 f2 f2 00 00 00 00 00 f2 ffffc90015fff800: f2 f2 f2 f2 00 00 00 00 00 00 f2 f2 f2 f2 00 00 >ffffc90015fff880: 00 00 00 00 00 00 f2 f2 f2 f2 00 00 00 f2 f2 f2 ^ ffffc90015fff900: f2 f2 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 ffffc90015fff980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================