syzbot


KMSAN: uninit-value in gf128mul_4k_lle (4)

Status: closed as invalid on 2020/07/22 14:12
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 751d, last: 749d
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in gf128mul_4k_lle (2) C 1102 1487d 1506d 0/23 closed as invalid on 2018/07/17 13:23
upstream KMSAN: uninit-value in gf128mul_4k_lle C 11 1568d 1583d 0/23 closed as invalid on 2018/04/22 15:44
upstream KMSAN: uninit-value in gf128mul_4k_lle (3) C 2958 987d 1353d 15/23 fixed on 2019/11/29 15:48

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in u128_xor include/crypto/b128ops.h:66 [inline]
BUG: KMSAN: uninit-value in be128_xor include/crypto/b128ops.h:72 [inline]
BUG: KMSAN: uninit-value in gf128mul_4k_lle+0x202/0x2b0 crypto/gf128mul.c:394
CPU: 0 PID: 8478 Comm: syz-executor268 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
 u128_xor include/crypto/b128ops.h:66 [inline]
 be128_xor include/crypto/b128ops.h:72 [inline]
 gf128mul_4k_lle+0x202/0x2b0 crypto/gf128mul.c:394
 ghash_update+0x9cc/0x1130 crypto/ghash-generic.c:101
 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
 hash_sendpage_nokey+0x3a4/0x430 crypto/algif_hash.c:350
 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: 0033:0x440419
Code: Bad RIP value.
RSP: 002b:00007ffff699dc48 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440419
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00000000006cb018 R08: 0000000000000017 R09: 65732f636f72702f
R10: 0000000000000fd2 R11: 0000000000000246 R12: 0000000000401c80
R13: 0000000000401d10 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
 crypto_xor include/crypto/algapi.h:148 [inline]
 ghash_update+0xa83/0x1130 crypto/ghash-generic.c:100
 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
 hash_sendpage_nokey+0x3a4/0x430 crypto/algif_hash.c:350
 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

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 (6):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kmsan-gce 2020/07/19 10:02 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config log report syz C
ci-upstream-kmsan-gce 2020/07/18 09:14 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config log report
ci-upstream-kmsan-gce 2020/07/18 06:44 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config log report
ci-upstream-kmsan-gce 2020/07/18 03:25 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config log report
ci-upstream-kmsan-gce 2020/07/17 22:48 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config log report
ci-upstream-kmsan-gce 2020/07/17 21:05 https://github.com/google/kmsan.git master 14525656779e 9c812472 .config log report