================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline] BUG: KASAN: slab-out-of-bounds in dh_pack_data crypto/dh_helper.c:21 [inline] BUG: KASAN: slab-out-of-bounds in crypto_dh_encode_key+0x670/0x830 crypto/dh_helper.c:64 Write of size 2049 at addr ffff8801ab84e696 by task syz-executor2/14186 CPU: 1 PID: 14186 Comm: syz-executor2 Not tainted 4.18.0-rc7-next-20180803+ #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x37/0x50 mm/kasan/kasan.c:303 memcpy include/linux/string.h:345 [inline] dh_pack_data crypto/dh_helper.c:21 [inline] crypto_dh_encode_key+0x670/0x830 crypto/dh_helper.c:64 __keyctl_dh_compute+0x707/0x1c00 security/keys/dh.c:316 keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 __do_sys_keyctl security/keys/keyctl.c:1741 [inline] __se_sys_keyctl security/keys/keyctl.c:1637 [inline] __x64_sys_keyctl+0x12a/0x3b0 security/keys/keyctl.c:1637 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456cb9 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdada502c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00007fdada5036d4 RCX: 0000000000456cb9 RDX: 00000000200002c0 RSI: 00000000200001c0 RDI: 0000000000000017 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000009a R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d1920 R14: 00000000004c72f5 R15: 0000000000000000 Allocated by task 14186: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] __keyctl_dh_compute+0x6e1/0x1c00 security/keys/dh.c:311 keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 __do_sys_keyctl security/keys/keyctl.c:1741 [inline] __se_sys_keyctl security/keys/keyctl.c:1637 [inline] __x64_sys_keyctl+0x12a/0x3b0 security/keys/keyctl.c:1637 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11492: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 kzfree+0x28/0x30 mm/slab_common.c:1543 crypto_destroy_tfm+0x158/0x300 crypto/api.c:584 crypto_free_tfm include/linux/crypto.h:662 [inline] crypto_free_cipher include/linux/crypto.h:1482 [inline] crypto_cfb_exit_tfm+0x34/0x40 crypto/cfb.c:246 crypto_skcipher_exit_tfm+0x59/0x70 crypto/skcipher.c:834 crypto_exit_ops crypto/api.c:324 [inline] crypto_destroy_tfm+0xbb/0x300 crypto/api.c:582 crypto_free_skcipher include/crypto/skcipher.h:212 [inline] chachapoly_exit+0x5d/0x70 crypto/chacha20poly1305.c:565 crypto_aead_exit_tfm+0x59/0x70 crypto/aead.c:95 crypto_exit_ops crypto/api.c:324 [inline] crypto_destroy_tfm+0xbb/0x300 crypto/api.c:582 crypto_free_aead include/crypto/aead.h:193 [inline] aead_release+0x30/0x50 crypto/algif_aead.c:510 alg_do_release crypto/af_alg.c:119 [inline] alg_sock_destruct+0x92/0xe0 crypto/af_alg.c:361 __sk_destruct+0x107/0xa60 net/core/sock.c:1605 sk_destruct+0x78/0x90 net/core/sock.c:1640 __sk_free+0xcf/0x300 net/core/sock.c:1651 sk_free+0x42/0x50 net/core/sock.c:1662 sock_put include/net/sock.h:1691 [inline] af_alg_release_parent+0x154/0x240 crypto/af_alg.c:147 aead_sock_destruct+0x19d/0x200 crypto/algif_aead.c:542 __sk_destruct+0x107/0xa60 net/core/sock.c:1605 sk_destruct+0x78/0x90 net/core/sock.c:1640 __sk_free+0xcf/0x300 net/core/sock.c:1651 sk_free+0x42/0x50 net/core/sock.c:1662 sock_put include/net/sock.h:1691 [inline] af_alg_release+0x6e/0x90 crypto/af_alg.c:126 __sock_release+0xd7/0x250 net/socket.c:580 sock_close+0x19/0x20 net/socket.c:1140 __fput+0x376/0x8a0 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801ab84d680 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 4118 bytes inside of 8192-byte region [ffff8801ab84d680, ffff8801ab84f680) The buggy address belongs to the page: page:ffffea0006ae1300 count:1 mapcount:0 mapping:ffff8801dac02080 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea000686c308 ffffea0006cd6b08 ffff8801dac02080 raw: 0000000000000000 ffff8801ab84d680 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ab84ed80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801ab84ee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801ab84ee80: 00 00 03 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801ab84ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801ab84ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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