================================================================== BUG: KASAN: slab-out-of-bounds in sg_assign_page include/linux/scatterlist.h:131 [inline] BUG: KASAN: slab-out-of-bounds in sg_set_page include/linux/scatterlist.h:162 [inline] BUG: KASAN: slab-out-of-bounds in af_alg_pull_tsgl+0x1c6/0x740 crypto/af_alg.c:711 Read of size 8 at addr ffff888036a64ca0 by task syz.4.3398/18154 CPU: 1 UID: 0 PID: 18154 Comm: syz.4.3398 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 sg_assign_page include/linux/scatterlist.h:131 [inline] sg_set_page include/linux/scatterlist.h:162 [inline] af_alg_pull_tsgl+0x1c6/0x740 crypto/af_alg.c:711 _skcipher_recvmsg crypto/algif_skcipher.c:152 [inline] skcipher_recvmsg+0x5df/0x1140 crypto/algif_skcipher.c:221 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0x172/0x1b0 net/socket.c:1100 __sys_recvfrom+0x240/0x3c0 net/socket.c:2256 __do_sys_recvfrom net/socket.c:2271 [inline] __se_sys_recvfrom net/socket.c:2267 [inline] __x64_sys_recvfrom+0xde/0x100 net/socket.c:2267 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa8b4b5d04e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007fa8b5a19e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: ffffffffffffffda RBX: 00007fa8b5a1b6c0 RCX: 00007fa8b4b5d04e RDX: 0000000000001000 RSI: 00007fa8b5a1a000 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00007fa8b5a19f58 R14: 00007fa8b5a1a000 R15: 0000000000000000 Allocated by task 18154: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5260 [inline] __kmalloc_noprof+0x35c/0x760 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] sock_kmalloc+0xd6/0x160 net/core/sock.c:2880 _skcipher_recvmsg crypto/algif_skcipher.c:144 [inline] skcipher_recvmsg+0x54d/0x1140 crypto/algif_skcipher.c:221 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0x172/0x1b0 net/socket.c:1100 __sys_recvfrom+0x240/0x3c0 net/socket.c:2256 __do_sys_recvfrom net/socket.c:2271 [inline] __se_sys_recvfrom net/socket.c:2267 [inline] __x64_sys_recvfrom+0xde/0x100 net/socket.c:2267 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888036a64c80 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes to the right of allocated 32-byte region [ffff888036a64c80, ffff888036a64ca0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x36a64 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88813fea6780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800400040 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 23353553363, free_ts 23315288582 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3292 [inline] allocate_slab+0x77/0x660 mm/slub.c:3481 new_slab mm/slub.c:3539 [inline] refill_objects+0x331/0x3c0 mm/slub.c:7175 refill_sheaf mm/slub.c:2812 [inline] __pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615 alloc_from_pcs mm/slub.c:4717 [inline] slab_alloc_node mm/slub.c:4851 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_node_track_caller_noprof+0x572/0x7b0 mm/slub.c:5368 __kmemdup_nul mm/util.c:64 [inline] kstrdup+0x42/0x100 mm/util.c:84 __kernfs_new_node+0xa9/0x8e0 fs/kernfs/dir.c:633 kernfs_new_node+0x102/0x210 fs/kernfs/dir.c:718 kernfs_create_dir_ns+0x44/0x130 fs/kernfs/dir.c:1088 sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:73 [inline] kobject_add_internal+0x62b/0xd00 lib/kobject.c:240 kobject_add_varg lib/kobject.c:374 [inline] kobject_init_and_add+0x12b/0x1a0 lib/kobject.c:457 lookup_or_create_module_kobject+0xe3/0x170 kernel/params.c:774 kernel_add_sysfs_param+0x14/0xe0 kernel/params.c:797 page last free pid 981 tgid 981 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 vfree+0x25a/0x400 mm/vmalloc.c:3479 delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3398 process_one_work kernel/workqueue.c:3276 [inline] process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888036a64b80: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ffff888036a64c00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc >ffff888036a64c80: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff888036a64d00: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ffff888036a64d80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================