syzbot


KMSAN: uninit-value in sha256_update (2)

Status: auto-closed as invalid on 2022/09/10 00:52
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 868d, last: 868d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in sha256_update C 72 868d 873d 0/24 closed as invalid on 2020/07/22 14:12
Patch testing requests:
Created Duration User Patch Repo Result
2022/09/09 22:27 19m retest repro https://github.com/google/kmsan.git master OK log

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: 1 PID: 8457 Comm: syz-executor589 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_finup+0xa3/0x1b0 crypto/sha256_generic.c:68
 crypto_shash_finup+0x2b4/0x6b0 crypto/shash.c:181
 shash_digest_unaligned+0x22b/0x260 crypto/shash.c:189
 crypto_shash_digest crypto/shash.c:205 [inline]
 shash_ahash_digest+0x788/0x8a0 crypto/shash.c:322
 shash_async_digest+0xbb/0x110 crypto/shash.c:340
 crypto_ahash_op+0x1c6/0x6c0 crypto/ahash.c:370
 crypto_ahash_digest+0xdc/0x150 crypto/ahash.c:412
 hash_sendpage+0x9cc/0xdf0 crypto/algif_hash.c:159
 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: 0033:0x4403c9
Code: Bad RIP value.
RSP: 002b:00007ffeb83f6c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403c9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000014 R09: 65732f636f72702f
R10: 0000000000000400 R11: 0000000000000246 R12: 0000000000401c30
R13: 0000000000401cc0 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 (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kmsan-gce 2020/07/22 15:03 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config log report syz C
ci-upstream-kmsan-gce 2020/07/22 14:13 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config log report
ci-upstream-kmsan-gce-386 2020/07/22 14:44 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config log report
ci-upstream-kmsan-gce-386 2020/07/22 14:14 https://github.com/google/kmsan.git master 91e18444d6b0 128cd85f .config log report
* Struck through repros no longer work on HEAD.