================================================================== 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 ffff88802e2a4ff8 by task syz-executor.3/11574 CPU: 1 PID: 11574 Comm: syz-executor.3 Not tainted 6.4.0-rc5-syzkaller-00915-ge7c5433c5aaa #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: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 RIP: 0033:0x7faf9428c169 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:00007faf92dbc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007faf943ac120 RCX: 00007faf9428c169 RDX: 0000000020000180 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 00007faf942e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd911b0fdf R14: 00007faf92dbc300 R15: 0000000000022000 Allocated by task 11574: 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 ffff88802e2a4000 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 [ffff88802e2a4000, ffff88802e2a4ff8) The buggy address belongs to the physical page: page:ffffea0000b8a800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2e2a0 head:ffffea0000b8a800 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 ffffea0000b8a600 0000000000000002 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 0x1d2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1763, tgid 1763 (kworker/1:2), ts 582642022439, free_ts 323121976070 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 kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:574 __alloc_skb+0x129/0x330 net/core/skbuff.c:643 alloc_skb include/linux/skbuff.h:1289 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:751 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:808 [inline] nsim_dev_trap_report_work+0x2b1/0xc80 drivers/net/netdevsim/dev.c:853 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 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 free_pg_vec+0xf5/0x150 net/packet/af_packet.c:4320 packet_set_ring+0x6c7/0x1990 net/packet/af_packet.c:4539 packet_release+0x5aa/0xd10 net/packet/af_packet.c:3156 __sock_release+0xcd/0x290 net/socket.c:653 sock_close+0x1c/0x20 net/socket.c:1385 __fput+0x27c/0xa90 fs/file_table.c:321 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88802e2a4e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802e2a4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802e2a4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ^ ffff88802e2a5000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802e2a5080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================