================================================================== BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1219 [inline] BUG: KASAN: slab-out-of-bounds in pfkey_add+0x153e/0x3470 net/key/af_key.c:1498 Read of size 8192 at addr ffff8801c8913418 by task syzkaller441281/3327 CPU: 0 PID: 3327 Comm: syzkaller441281 Not tainted 4.9.74-g173c52e #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801c85bf718 ffffffff81d91b09 ffffea0007224480 ffff8801c8913418 0000000000000000 ffff8801c8913600 ffff8801c85bf958 ffff8801c85bf750 ffffffff8153b503 ffff8801c8913418 0000000000002000 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x73/0x280 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x275/0x360 mm/kasan/report.c:408 [] check_memory_region_inline mm/kasan/kasan.c:318 [inline] [] check_memory_region+0x137/0x190 mm/kasan/kasan.c:325 [] memcpy+0x23/0x50 mm/kasan/kasan.c:360 [] pfkey_msg2xfrm_state net/key/af_key.c:1219 [inline] [] pfkey_add+0x153e/0x3470 net/key/af_key.c:1498 [] pfkey_process+0x61e/0x730 net/key/af_key.c:2826 [] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3670 [] sock_sendmsg_nosec net/socket.c:635 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:645 [] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969 [] __sys_sendmsg+0xd6/0x190 net/socket.c:2003 [] C_SYSC_sendmsg net/compat.c:734 [inline] [] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:732 [] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline] [] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384 [] entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124 Allocated by task 3327: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:609 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] __kmalloc_track_caller+0xda/0x2b0 mm/slub.c:4232 __kmalloc_reserve.isra.37+0x33/0xc0 net/core/skbuff.c:138 __alloc_skb+0x119/0x600 net/core/skbuff.c:231 alloc_skb include/linux/skbuff.h:919 [inline] pfkey_sendmsg+0x135/0x760 net/key/af_key.c:3657 sock_sendmsg_nosec net/socket.c:635 [inline] sock_sendmsg+0xca/0x110 net/socket.c:645 ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969 __sys_sendmsg+0xd6/0x190 net/socket.c:2003 C_SYSC_sendmsg net/compat.c:734 [inline] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:732 do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124 Freed by task 1873: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0x103/0x300 mm/slub.c:3878 kernfs_fop_release+0xff/0x140 fs/kernfs/file.c:744 __fput+0x28c/0x6e0 fs/file_table.c:208 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x115/0x190 kernel/task_work.c:116 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0xfc/0x120 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline] syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259 entry_SYSCALL_64_fastpath+0xc4/0xc6 The buggy address belongs to the object at ffff8801c8913400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of 512-byte region [ffff8801c8913400, ffff8801c8913600) The buggy address belongs to the page: page:ffffea0007224480 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x8000000000004080(slab|head) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c8913500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c8913580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801c8913600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801c8913680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c8913700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================