syzbot


KASAN: wild-memory-access Write in scatterwalk_copychunks

Status: fixed on 2018/01/11 01:23
Subsystems: crypto
[Documentation on labels]
Reported-by: syzbot+afbe81311aa0da046f1e62a665eccddac254f803@syzkaller.appspotmail.com
Fix commit: e57121d08c38 crypto: chacha20poly1305 - validate the digest size
First crash: 2332d, last: 2302d
Duplicate bugs (1)
duplicates (1):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
general protection fault in blkcipher_walk_done (2) crypto C 8 2298d 2304d 0/26 closed as dup on 2018/01/03 19:43

Sample crash report:
audit: type=1400 audit(1514230284.652:7): avc:  denied  { map } for  pid=3146 comm="syzkaller250869" path="/root/syzkaller250869911" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: wild-memory-access in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: wild-memory-access in memcpy_dir crypto/scatterwalk.c:28 [inline]
BUG: KASAN: wild-memory-access in scatterwalk_copychunks+0x206/0x480 crypto/scatterwalk.c:43
Write of size 16 at addr 00050800c7c5a698 by task syzkaller250869/3146

CPU: 1 PID: 3146 Comm: syzkaller250869 Not tainted 4.15.0-rc5+ #237
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
 kasan_report_error mm/kasan/report.c:349 [inline]
 kasan_report+0x13b/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
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 memcpy include/linux/string.h:344 [inline]
 memcpy_dir crypto/scatterwalk.c:28 [inline]
 scatterwalk_copychunks+0x206/0x480 crypto/scatterwalk.c:43
 blkcipher_done_slow crypto/blkcipher.c:81 [inline]
 blkcipher_walk_done+0xa4b/0xde0 crypto/blkcipher.c:118
 glue_ctr_crypt_128bit+0x597/0xc20 arch/x86/crypto/glue_helper.c:289
 ctr_crypt+0x34/0x40 arch/x86/crypto/serpent_avx2_glue.c:168
 __ablk_encrypt+0x1d1/0x2d0 crypto/ablk_helper.c:64
 ablk_encrypt+0x23e/0x2c0 crypto/ablk_helper.c:84
 skcipher_crypt_ablkcipher crypto/skcipher.c:712 [inline]
 skcipher_decrypt_ablkcipher+0x312/0x420 crypto/skcipher.c:730
 crypto_skcipher_decrypt include/crypto/skcipher.h:463 [inline]
 chacha_decrypt crypto/chacha20poly1305.c:152 [inline]
 poly_tail_continue+0x42a/0x6b0 crypto/chacha20poly1305.c:167
 poly_tail+0x40f/0x520 crypto/chacha20poly1305.c:201
 poly_cipherpad+0x33e/0x470 crypto/chacha20poly1305.c:231
 poly_cipher+0x303/0x440 crypto/chacha20poly1305.c:262
 poly_adpad+0x347/0x480 crypto/chacha20poly1305.c:292
 poly_ad+0x25c/0x300 crypto/chacha20poly1305.c:316
 poly_setkey+0x2fc/0x3e0 crypto/chacha20poly1305.c:343
 poly_init+0x16c/0x1d0 crypto/chacha20poly1305.c:366
 poly_genkey+0x422/0x590 crypto/chacha20poly1305.c:406
 chachapoly_decrypt+0x73/0x90 crypto/chacha20poly1305.c:488
 crypto_aead_decrypt include/crypto/aead.h:362 [inline]
 _aead_recvmsg crypto/algif_aead.c:314 [inline]
 aead_recvmsg+0x154a/0x1cf0 crypto/algif_aead.c:335
 sock_recvmsg_nosec net/socket.c:809 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:816
 ___sys_recvmsg+0x2a4/0x640 net/socket.c:2185
 __sys_recvmsg+0xe2/0x210 net/socket.c:2230
 SYSC_recvmsg net/socket.c:2242 [inline]
 SyS_recvmsg+0x2d/0x50 net/socket.c:2237
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43fef9
RSP: 002b:00007ffe46e63528 EFLAGS: 00000217 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fef9
RDX: 0000000000000000 RSI: 000000002022efc8 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401860
R13: 00000000004018f0 R14: 0000000000000000 R15: 0000000000000000
==================================================================

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/12/25 19:33 upstream 464e1d5f23cc 73aba437 .config console log report syz C ci-upstream-kasan-gce
2017/12/24 01:43 upstream caf9a82657b3 73aba437 .config console log report syz C ci-upstream-kasan-gce
2017/12/08 13:57 upstream 968edbd93c0c b0fa969c .config console log report syz C ci-upstream-kasan-gce
2017/12/25 19:11 net-next-old fba961ab29e5 73aba437 .config console log report syz C ci-upstream-net-kasan-gce
2017/12/23 20:41 net-next-old fba961ab29e5 73aba437 .config console log report syz C ci-upstream-net-kasan-gce
2017/12/06 12:36 net-next-old b9f242047f21 0796857b .config console log report syz C ci-upstream-net-kasan-gce
2017/12/26 13:38 linux-next 0e08c463db38 73aba437 .config console log report syz C ci-upstream-next-kasan-gce
2017/12/26 03:22 mmots 37759fa6d0fa 73aba437 .config console log report syz C ci-upstream-mmots-kasan-gce
2017/12/25 02:37 linux-next 0e08c463db38 73aba437 .config console log report syz C ci-upstream-next-kasan-gce
2017/12/24 15:52 mmots 37759fa6d0fa 73aba437 .config console log report syz C ci-upstream-mmots-kasan-gce
2017/12/09 02:49 linux-next ad4dac17f9d5 5ad0ce95 .config console log report syz C ci-upstream-next-kasan-gce
2018/01/05 14:37 net-next-old 72deacce011b 00193447 .config console log report ci-upstream-net-kasan-gce
2017/12/31 02:04 net-next-old 6bb8824732f6 bb6384b8 .config console log report ci-upstream-net-kasan-gce
2017/12/27 06:29 net-next-old 243dc5fb4697 73aba437 .config console log report ci-upstream-net-kasan-gce
2017/12/06 12:08 net-next-old b9f242047f21 0796857b .config console log report ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.