syzbot

 sign-in | mailing list | source | docs
🐞 Open [1033] ≡ Subsystems 🐞 Fixed [5264] 🐞 Invalid [12588] ⬇ Missing Backports [85] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

KMSAN: uninit-value in sha256_update

Status: closed as invalid on 2020/07/22 14:12
Subsystems: crypto
[Documentation on labels]
First crash: 1389d, last: 1385d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in sha256_update (2) crypto C 4 1385d 1385d 0/26 auto-closed as invalid on 2022/09/10 00:52

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
BUG: KMSAN: uninit-value in __fswab32 include/uapi/linux/swab.h:60 [inline]
BUG: KMSAN: uninit-value in __swab32p include/uapi/linux/swab.h:189 [inline]
BUG: KMSAN: uninit-value in __be32_to_cpup include/uapi/linux/byteorder/little_endian.h:82 [inline]
BUG: KMSAN: uninit-value in get_unaligned_be32 include/linux/unaligned/access_ok.h:30 [inline]
BUG: KMSAN: uninit-value in LOAD_OP lib/crypto/sha256.c:38 [inline]
BUG: KMSAN: uninit-value in sha256_transform lib/crypto/sha256.c:54 [inline]
BUG: KMSAN: uninit-value in sha256_update+0x8bf0/0x9090 lib/crypto/sha256.c:227
CPU: 0 PID: 8453 Comm: syz-executor191 Not tainted 5.8.0-rc5-syzkaller #0
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+0x1df/0x240 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
 __fswab32 include/uapi/linux/swab.h:60 [inline]
 __swab32p include/uapi/linux/swab.h:189 [inline]
 __be32_to_cpup include/uapi/linux/byteorder/little_endian.h:82 [inline]
 get_unaligned_be32 include/linux/unaligned/access_ok.h:30 [inline]
 LOAD_OP lib/crypto/sha256.c:38 [inline]
 sha256_transform lib/crypto/sha256.c:54 [inline]
 sha256_update+0x8bf0/0x9090 lib/crypto/sha256.c:227
 crypto_sha256_update+0x8b/0xb0 crypto/sha256_generic.c:51
 crypto_shash_update+0x4e9/0x550 crypto/shash.c:106
 shash_ahash_update crypto/shash.c:262 [inline]
 shash_async_update+0x113/0x1d0 crypto/shash.c:270
 crypto_ahash_update include/crypto/hash.h:547 [inline]
 hash_sendpage+0x8ef/0xdf0 crypto/algif_hash.c:168
 kernel_sendpage net/socket.c:3642 [inline]
 sock_sendpage+0x1e1/0x2c0 net/socket.c:945
 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:448
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x565/0xf00 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:834
 do_splice_from fs/splice.c:846 [inline]
 direct_splice_actor+0x1fd/0x580 fs/splice.c:1016
 splice_direct_to_actor+0x6b2/0xf50 fs/splice.c:971
 do_splice_direct+0x342/0x580 fs/splice.c:1059
 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540
 __do_sys_sendfile64 fs/read_write.c:1601 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587
 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4403d9
Code: Bad RIP value.
RSP: 002b:00007ffd7cabbf48 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403d9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 00000000006ca018 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 0000000000000fff R11: 0000000000000246 R12: 0000000000401c40
R13: 0000000000401cd0 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144
 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline]
 kmsan_alloc_page+0xb9/0x180 mm/kmsan/kmsan_shadow.c:293
 __alloc_pages_nodemask+0x56a2/0x5dc0 mm/page_alloc.c:4889
 alloc_pages_current+0x672/0x990 mm/mempolicy.c:2292
 alloc_pages include/linux/gfp.h:545 [inline]
 push_pipe+0x605/0xb70 lib/iov_iter.c:537
 __pipe_get_pages lib/iov_iter.c:1278 [inline]
 pipe_get_pages_alloc lib/iov_iter.c:1385 [inline]
 iov_iter_get_pages_alloc+0x18a9/0x21c0 lib/iov_iter.c:1403
 default_file_splice_read fs/splice.c:385 [inline]
 do_splice_to+0x4fc/0x14f0 fs/splice.c:871
 splice_direct_to_actor+0x45c/0xf50 fs/splice.c:950
 do_splice_direct+0x342/0x580 fs/splice.c:1059
 do_sendfile+0x101b/0x1d40 fs/read_write.c:1540
 __do_sys_sendfile64 fs/read_write.c:1601 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1587
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1587
 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================

Crashes (72):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/07/20 02:26 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report syz C ci-upstream-kmsan-gce
2020/07/22 03:06 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce
2020/07/21 11:34 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 09:19 https://github.com/google/kmsan.git master 91e18444d6b0 d88894e6 .config console log report ci-upstream-kmsan-gce
2020/07/21 02:14 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 23:23 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 22:37 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 21:53 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 16:36 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce
2020/07/20 07:26 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/19 09:11 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/19 09:11 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/18 23:39 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/18 19:28 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/18 18:54 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/18 18:46 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/18 18:43 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/18 10:33 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/18 04:47 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/18 03:25 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/17 23:05 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/17 21:55 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/17 21:36 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/17 20:15 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/17 18:32 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce
2020/07/22 12:44 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config console log report ci-upstream-kmsan-gce-386
2020/07/22 05:21 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce-386
2020/07/22 03:06 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce-386
2020/07/22 00:39 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce-386
2020/07/21 21:33 https://github.com/google/kmsan.git master 91e18444d6b0 21f1765e .config console log report ci-upstream-kmsan-gce-386
2020/07/21 02:39 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce-386
2020/07/20 23:37 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce-386
2020/07/20 22:09 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce-386
2020/07/20 17:22 https://github.com/google/kmsan.git master 91e18444d6b0 4285ffa3 .config console log report ci-upstream-kmsan-gce-386
2020/07/19 11:23 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/19 10:55 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/19 10:53 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/19 09:05 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/19 09:03 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/18 23:49 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/18 20:14 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/18 20:11 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/18 19:28 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/18 18:40 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/18 14:50 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/18 00:05 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/17 22:44 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/17 20:20 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
2020/07/17 20:17 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config console log report ci-upstream-kmsan-gce-386
* Struck through repros no longer work on HEAD.