syzbot


KASAN: stack-out-of-bounds Write in sha3_final

Status: closed as dup on 2017/11/28 19:13
Subsystems: crypto
[Documentation on labels]
Reported-by: syzbot+21d2e751cbf850bffdba93a41b744ee510bb7613@syzkaller.appspotmail.com
First crash: 2402d, last: 2401d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: stack-out-of-bounds Write in sha3_update crypto C 5 2402d 2398d

Sample crash report:
==================================================================
BUG: KASAN: stack-out-of-bounds in memset include/linux/string.h:326 [inline]
BUG: KASAN: stack-out-of-bounds in sha3_final+0xeb/0x2e0 crypto/sha3_generic.c:173
Write of size 4294967174 at addr ffff8801cca5fcba by task syzkaller674662/3156

CPU: 0 PID: 3156 Comm: syzkaller674662 Not tainted 4.14.0+ #192
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memset+0x23/0x40 mm/kasan/kasan.c:285
 memset include/linux/string.h:326 [inline]
 sha3_final+0xeb/0x2e0 crypto/sha3_generic.c:173
 crypto_shash_final+0xd3/0x1f0 crypto/shash.c:144
 shash_finup_unaligned+0x40/0x60 crypto/shash.c:151
 crypto_shash_finup+0xc4/0x120 crypto/shash.c:165
 hmac_finup+0x182/0x330 crypto/hmac.c:152
 crypto_shash_finup+0xc4/0x120 crypto/shash.c:165
 shash_digest_unaligned+0x9e/0xd0 crypto/shash.c:172
 crypto_shash_digest+0xc4/0x120 crypto/shash.c:186
 hmac_setkey+0x36a/0x690 crypto/hmac.c:66
 crypto_shash_setkey+0xad/0x190 crypto/shash.c:64
 shash_async_setkey+0x47/0x60 crypto/shash.c:207
 crypto_ahash_setkey+0xaf/0x180 crypto/ahash.c:200
 hash_setkey+0x40/0x90 crypto/algif_hash.c:446
 alg_setkey crypto/af_alg.c:221 [inline]
 alg_setsockopt+0x2a1/0x350 crypto/af_alg.c:254
 SYSC_setsockopt net/socket.c:1851 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1830
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4460e9
RSP: 002b:00007f9d04c08dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004460e9
RDX: 0000000000000001 RSI: 0000000000000117 RDI: 0000000000000005
RBP: 0000000000000086 R08: 0000000000000079 R09: 00007f9d04c09700
R10: 0000000020002000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe4c265f6f R14: 00007f9d04c099c0 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00073297c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cca5fd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cca5fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801cca5fe80: f1 f1 f1 f1 04 f2 f2 f2 f2 f2 f2 f2 04 f2 f2 f2
                   ^
 ffff8801cca5ff00: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cca5ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/11/24 16:02 net-next-old 1d3b78bbc6e9 deb5f6ae .config console log report syz C ci-upstream-kasan-gce
2017/11/24 15:12 net-next-old 1d3b78bbc6e9 deb5f6ae .config console log report syz C ci-upstream-kasan-gce
2017/11/24 17:54 net-next-old 0c86a6bd85ff ddf7b3e0 .config console log report syz C ci-upstream-net-kasan-gce
2017/11/24 16:37 mmots 1ea8d039f9ed deb5f6ae .config console log report syz C ci-upstream-mmots-kasan-gce
2017/11/24 16:14 linux-next 6fc478f80f68 4bd70f88 .config console log report syz C ci-upstream-next-kasan-gce
* Struck through repros no longer work on HEAD.