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KMSAN: uninit-value in copy_siginfo_to_user

Status: closed as dup on 2019/06/10 23:35
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+ab504332a376ca03331e@syzkaller.appspotmail.com
First crash: 2507d, last: 2454d
▶ ▼ Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
KMSAN: kernel-infoleak in copy_siginfo_to_user (2) kernel C 15 2118d 2148d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
KMSAN: uninit-value in copy_siginfo_to_user 0 (1) 2018/07/17 13:23

Sample crash report:
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KMSAN: uninit-value in copy_siginfo_to_user+0x383/0x1270 kernel/signal.c:2870
CPU: 1 PID: 4746 Comm: syz-executor0 Not tainted 4.17.0-rc5+ #103
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x149/0x260 mm/kmsan/kmsan.c:1084
 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686
 copy_siginfo_to_user+0x383/0x1270 kernel/signal.c:2870
 ptrace_peek_siginfo kernel/ptrace.c:741 [inline]
 ptrace_request+0x1d6a/0x20e0 kernel/ptrace.c:912
 arch_ptrace+0x1f6/0x1230 arch/x86/kernel/ptrace.c:877
 __do_sys_ptrace kernel/ptrace.c:1145 [inline]
 __se_sys_ptrace+0x309/0x850 kernel/ptrace.c:1110
 __x64_sys_ptrace+0x11e/0x170 kernel/ptrace.c:1110
 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a09
RSP: 002b:00007ffc971089c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000065
RAX: ffffffffffffffda RBX: 0000000000acf914 RCX: 0000000000455a09
RDX: 0000000000730004 RSI: 0000000000000001 RDI: 0000000000004209
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000558 R14: 00000000006fd0e0 R15: 000000000000b0fe

Local variable description: ----kiov@ptrace_request
Variable was created at:
 ptrace_request+0x194/0x20e0 kernel/ptrace.c:885
 arch_ptrace+0x1f6/0x1230 arch/x86/kernel/ptrace.c:877
==================================================================

Crashes (289):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/30 18:11 https://github.com/google/kmsan.git master 8fc8ecd1c58a 2f93b54f .config console log report syz ci-upstream-kmsan-gce
2018/05/29 01:17 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report syz ci-upstream-kmsan-gce
2018/05/28 02:09 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report syz ci-upstream-kmsan-gce
2018/05/27 20:58 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report syz ci-upstream-kmsan-gce
2018/05/22 13:06 https://github.com/google/kmsan.git master 1b9cd4eccac9 f48c20b8 .config console log report syz ci-upstream-kmsan-gce
2018/05/21 14:30 https://github.com/google/kmsan.git master 9f127b7ceaf7 f48c20b8 .config console log report syz ci-upstream-kmsan-gce
2018/05/19 13:40 https://github.com/google/kmsan.git master 9f127b7ceaf7 849705db .config console log report syz ci-upstream-kmsan-gce
2018/05/19 03:13 https://github.com/google/kmsan.git master f6e2e65b4fff 849705db .config console log report syz ci-upstream-kmsan-gce
2018/07/09 17:47 https://github.com/google/kmsan.git master a00de5aa4da3 f25e5770 .config console log report ci-upstream-kmsan-gce
2018/07/09 12:51 https://github.com/google/kmsan.git master a00de5aa4da3 f25e5770 .config console log report ci-upstream-kmsan-gce
2018/07/09 09:59 https://github.com/google/kmsan.git master a00de5aa4da3 f25e5770 .config console log report ci-upstream-kmsan-gce
2018/07/09 09:55 https://github.com/google/kmsan.git master a00de5aa4da3 f25e5770 .config console log report ci-upstream-kmsan-gce
2018/07/09 00:51 https://github.com/google/kmsan.git master a00de5aa4da3 f25e5770 .config console log report ci-upstream-kmsan-gce
2018/07/08 23:14 https://github.com/google/kmsan.git master a00de5aa4da3 f25e5770 .config console log report ci-upstream-kmsan-gce
2018/07/08 21:41 https://github.com/google/kmsan.git master a00de5aa4da3 f25e5770 .config console log report ci-upstream-kmsan-gce
2018/07/08 05:13 https://github.com/google/kmsan.git master a00de5aa4da3 c9a7a4dc .config console log report ci-upstream-kmsan-gce
2018/07/08 04:02 https://github.com/google/kmsan.git master a00de5aa4da3 c9a7a4dc .config console log report ci-upstream-kmsan-gce
2018/07/08 00:53 https://github.com/google/kmsan.git master a00de5aa4da3 ab89aea9 .config console log report ci-upstream-kmsan-gce
2018/07/07 23:17 https://github.com/google/kmsan.git master a00de5aa4da3 ab89aea9 .config console log report ci-upstream-kmsan-gce
2018/07/07 16:17 https://github.com/google/kmsan.git master a00de5aa4da3 ab89aea9 .config console log report ci-upstream-kmsan-gce
2018/07/07 11:25 https://github.com/google/kmsan.git master a00de5aa4da3 6c0c0099 .config console log report ci-upstream-kmsan-gce
2018/07/07 06:45 https://github.com/google/kmsan.git master a00de5aa4da3 6c0c0099 .config console log report ci-upstream-kmsan-gce
2018/07/07 03:27 https://github.com/google/kmsan.git master a00de5aa4da3 6c0c0099 .config console log report ci-upstream-kmsan-gce
2018/07/06 23:40 https://github.com/google/kmsan.git master a00de5aa4da3 9636bc93 .config console log report ci-upstream-kmsan-gce
2018/07/06 20:43 https://github.com/google/kmsan.git master a00de5aa4da3 9636bc93 .config console log report ci-upstream-kmsan-gce
2018/07/06 15:45 https://github.com/google/kmsan.git master a00de5aa4da3 9636bc93 .config console log report ci-upstream-kmsan-gce
2018/07/06 09:19 https://github.com/google/kmsan.git master 9c9df9f275f0 18403e65 .config console log report ci-upstream-kmsan-gce
2018/07/06 09:19 https://github.com/google/kmsan.git master 9c9df9f275f0 18403e65 .config console log report ci-upstream-kmsan-gce
2018/07/06 02:36 https://github.com/google/kmsan.git master 86eb85c04833 d3b2a0e2 .config console log report ci-upstream-kmsan-gce
2018/07/05 12:49 https://github.com/google/kmsan.git master c1adbc427188 f525fd72 .config console log report ci-upstream-kmsan-gce
2018/07/05 08:44 https://github.com/google/kmsan.git master c1adbc427188 f525fd72 .config console log report ci-upstream-kmsan-gce
2018/07/05 07:42 https://github.com/google/kmsan.git master c1adbc427188 f525fd72 .config console log report ci-upstream-kmsan-gce
2018/07/04 23:57 https://github.com/google/kmsan.git master accdc89e1dc3 e1b966c6 .config console log report ci-upstream-kmsan-gce
2018/07/04 19:01 https://github.com/google/kmsan.git master accdc89e1dc3 e1b966c6 .config console log report ci-upstream-kmsan-gce
2018/07/03 19:45 https://github.com/google/kmsan.git master 4ca559bbdeaf 317fc8ea .config console log report ci-upstream-kmsan-gce
2018/07/03 18:13 https://github.com/google/kmsan.git master 4ca559bbdeaf 317fc8ea .config console log report ci-upstream-kmsan-gce
2018/07/03 09:28 https://github.com/google/kmsan.git master 4ca559bbdeaf 317fc8ea .config console log report ci-upstream-kmsan-gce
2018/07/03 07:00 https://github.com/google/kmsan.git master 4ca559bbdeaf 317fc8ea .config console log report ci-upstream-kmsan-gce
2018/07/03 05:03 https://github.com/google/kmsan.git master 4ca559bbdeaf 317fc8ea .config console log report ci-upstream-kmsan-gce
2018/07/03 05:00 https://github.com/google/kmsan.git master 4ca559bbdeaf 317fc8ea .config console log report ci-upstream-kmsan-gce
2018/07/03 00:35 https://github.com/google/kmsan.git master 6c3632ffef26 574780b0 .config console log report ci-upstream-kmsan-gce
2018/07/02 21:35 https://github.com/google/kmsan.git master 6c3632ffef26 574780b0 .config console log report ci-upstream-kmsan-gce
2018/07/02 20:34 https://github.com/google/kmsan.git master 6c3632ffef26 574780b0 .config console log report ci-upstream-kmsan-gce
2018/07/02 19:20 https://github.com/google/kmsan.git master 6c3632ffef26 574780b0 .config console log report ci-upstream-kmsan-gce
2018/07/02 17:45 https://github.com/google/kmsan.git master 6c3632ffef26 574780b0 .config console log report ci-upstream-kmsan-gce
2018/07/02 10:09 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/07/02 01:22 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/07/01 21:43 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/30 23:19 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/30 12:14 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/05/18 12:52 https://github.com/google/kmsan.git master cd34f1881058 c992b767 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.