================================================================== BUG: KASAN: slab-out-of-bounds in sg_assign_page include/linux/scatterlist.h:109 [inline] BUG: KASAN: slab-out-of-bounds in sg_set_page include/linux/scatterlist.h:139 [inline] BUG: KASAN: slab-out-of-bounds in extract_bvec_to_sg lib/scatterlist.c:1183 [inline] BUG: KASAN: slab-out-of-bounds in extract_iter_to_sg lib/scatterlist.c:1352 [inline] BUG: KASAN: slab-out-of-bounds in extract_iter_to_sg+0x17a6/0x1960 lib/scatterlist.c:1339 Read of size 8 at addr ffff8880152e8ff8 by task syz-executor.4/11496 CPU: 0 PID: 11496 Comm: syz-executor.4 Not tainted 6.4.0-rc5-syzkaller-00929-gded5c1a16ec6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 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:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 sg_assign_page include/linux/scatterlist.h:109 [inline] sg_set_page include/linux/scatterlist.h:139 [inline] extract_bvec_to_sg lib/scatterlist.c:1183 [inline] extract_iter_to_sg lib/scatterlist.c:1352 [inline] extract_iter_to_sg+0x17a6/0x1960 lib/scatterlist.c:1339 af_alg_sendmsg+0x1917/0x2990 crypto/af_alg.c:1045 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 splice_to_socket+0x954/0xe30 fs/splice.c:917 do_splice_from fs/splice.c:969 [inline] direct_splice_actor+0x114/0x180 fs/splice.c:1157 splice_direct_to_actor+0x34a/0x9c0 fs/splice.c:1103 do_splice_direct+0x1ad/0x280 fs/splice.c:1209 do_sendfile+0xb19/0x12c0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1308 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: 0033:0x7fb57888c169 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:00007fb57956e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fb5789ac120 RCX: 00007fb57888c169 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000006 RBP: 00007fb5788e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 000000010000a006 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe6cbfe7ff R14: 00007fb57956e300 R15: 0000000000022000 Allocated by task 11493: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc+0x5e/0x190 mm/slab_common.c:979 kmalloc include/linux/slab.h:563 [inline] sock_kmalloc+0xb2/0x100 net/core/sock.c:2630 af_alg_alloc_tsgl crypto/af_alg.c:614 [inline] af_alg_sendmsg+0x17a4/0x2990 crypto/af_alg.c:1028 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 splice_to_socket+0x954/0xe30 fs/splice.c:917 do_splice_from fs/splice.c:969 [inline] direct_splice_actor+0x114/0x180 fs/splice.c:1157 splice_direct_to_actor+0x34a/0x9c0 fs/splice.c:1103 do_splice_direct+0x1ad/0x280 fs/splice.c:1209 do_sendfile+0xb19/0x12c0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1316 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x14d/0x210 fs/read_write.c:1308 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 The buggy address belongs to the object at ffff8880152e8000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 0 bytes to the right of allocated 4088-byte region [ffff8880152e8000, ffff8880152e8ff8) The buggy address belongs to the physical page: page:ffffea000054ba00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x152e8 head:ffffea000054ba00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012442140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 8493, tgid 8489 (syz-executor.0), ts 281202420700, free_ts 280173418402 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3192 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291 __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3490 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:986 __do_krealloc mm/slab_common.c:1359 [inline] krealloc+0x5e/0x100 mm/slab_common.c:1392 copy_array+0x81/0xe0 kernel/bpf/verifier.c:1550 copy_stack_state kernel/bpf/verifier.c:1604 [inline] copy_func_state kernel/bpf/verifier.c:1725 [inline] copy_verifier_state+0x7d0/0xc60 kernel/bpf/verifier.c:1763 push_stack+0x1d8/0x560 kernel/bpf/verifier.c:1834 check_cond_jmp_op kernel/bpf/verifier.c:13764 [inline] do_check kernel/bpf/verifier.c:16297 [inline] do_check_common+0x67d8/0xc6a0 kernel/bpf/verifier.c:18614 do_check_main kernel/bpf/verifier.c:18677 [inline] bpf_check+0x7509/0xb030 kernel/bpf/verifier.c:19301 bpf_prog_load+0x16d9/0x2210 kernel/bpf/syscall.c:2653 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564 free_unref_page+0x33/0x370 mm/page_alloc.c:2659 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:711 [inline] slab_alloc_node mm/slub.c:3451 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc+0x17c/0x3b0 mm/slub.c:3475 getname_flags.part.0+0x50/0x4f0 fs/namei.c:140 getname_flags+0x9e/0xe0 include/linux/audit.h:321 user_path_at_empty+0x2f/0x60 fs/namei.c:2906 do_readlinkat+0xcd/0x2f0 fs/stat.c:477 __do_sys_readlink fs/stat.c:510 [inline] __se_sys_readlink fs/stat.c:507 [inline] __x64_sys_readlink+0x78/0xb0 fs/stat.c:507 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 Memory state around the buggy address: ffff8880152e8e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880152e8f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880152e8f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ^ ffff8880152e9000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880152e9080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================