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KMSAN: kernel-infoleak in copy_siginfo_to_user

Status: closed as invalid on 2019/05/03 14:05
Subsystems: kernel
[Documentation on labels]
First crash: 2118d, last: 1823d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[PATCH] ptrace: zero out siginfo_t in ptrace_peek_siginfo() 2 (2) 2018/10/10 07:16
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in copy_siginfo_to_user (2) kernel C 15 1781d 1811d 12/26 fixed on 2019/07/10 21:40
upstream KMSAN: kernel-infoleak-after-free in copy_siginfo_to_user (2) kernel C 1095 13h50m 188d 0/26 upstream: reported C repro on 2023/10/21 18:49

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KMSAN: kernel-infoleak in copy_to_user include/linux/uaccess.h:184 [inline]
BUG: KMSAN: kernel-infoleak in copy_siginfo_to_user+0xf0/0x150 kernel/signal.c:2854
CPU: 0 PID: 4543 Comm: syz-executor869 Not tainted 4.18.0-rc4+ #23
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+0x185/0x1e0 lib/dump_stack.c:113
 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:990
 kmsan_internal_check_memory+0x10e/0x210 mm/kmsan/kmsan.c:1048
 kmsan_copy_to_user+0x83/0xe0 mm/kmsan/kmsan_hooks.c:479
 copy_to_user include/linux/uaccess.h:184 [inline]
 copy_siginfo_to_user+0xf0/0x150 kernel/signal.c:2854
 ptrace_peek_siginfo kernel/ptrace.c:741 [inline]
 ptrace_request+0x232d/0x2790 kernel/ptrace.c:912
 arch_ptrace+0xbcc/0x12c0 arch/x86/kernel/ptrace.c:877
 __do_sys_ptrace kernel/ptrace.c:1145 [inline]
 __se_sys_ptrace+0x2f0/0x850 kernel/ptrace.c:1110
 __x64_sys_ptrace+0x11e/0x170 kernel/ptrace.c:1110
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x4401b9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007ffcd9ce9e68 EFLAGS: 00000286 ORIG_RAX: 0000000000000065
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00000000004401b9
RDX: 0000000020000004 RSI: 0000000000000001 RDI: 0000000000004209
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000020000100 R11: 0000000000000286 R12: 0000000000401a40
R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000

Local variable description: ----kiov@ptrace_request
Variable was created at:
 ptrace_request+0x1bf/0x2790 kernel/ptrace.c:885
 arch_ptrace+0xbcc/0x12c0 arch/x86/kernel/ptrace.c:877

Bytes 0-15 of 128 are uninitialized
Memory access starts at ffff880193b8fca8
==================================================================

Crashes (779):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/09 23:47 https://github.com/google/kmsan.git master 85c225c088f5 f25e5770 .config console log report syz C ci-upstream-kmsan-gce
2019/04/30 05:38 https://github.com/google/kmsan.git master 2550ba6f60b5 b617407b .config console log report ci-upstream-kmsan-gce
2019/04/28 09:16 https://github.com/google/kmsan.git master 199a02db1f61 b617407b .config console log report ci-upstream-kmsan-gce
2019/04/28 01:22 https://github.com/google/kmsan.git master 199a02db1f61 b617407b .config console log report ci-upstream-kmsan-gce
2019/04/27 01:28 https://github.com/google/kmsan.git master 199a02db1f61 b617407b .config console log report ci-upstream-kmsan-gce
2019/04/26 18:20 https://github.com/google/kmsan.git master 199a02db1f61 b617407b .config console log report ci-upstream-kmsan-gce
2019/04/26 15:31 https://github.com/google/kmsan.git master 199a02db1f61 b617407b .config console log report ci-upstream-kmsan-gce
2019/04/26 11:56 https://github.com/google/kmsan.git master 199a02db1f61 b617407b .config console log report ci-upstream-kmsan-gce
2019/04/26 09:24 https://github.com/google/kmsan.git master 199a02db1f61 b617407b .config console log report ci-upstream-kmsan-gce
2019/04/25 20:27 https://github.com/google/kmsan.git master 199a02db1f61 f46aabc8 .config console log report ci-upstream-kmsan-gce
2019/04/25 18:56 https://github.com/google/kmsan.git master 199a02db1f61 f46aabc8 .config console log report ci-upstream-kmsan-gce
2019/04/25 12:26 https://github.com/google/kmsan.git master 199a02db1f61 8e3c52b1 .config console log report ci-upstream-kmsan-gce
2019/04/24 10:30 https://github.com/google/kmsan.git master 199a02db1f61 8e3c52b1 .config console log report ci-upstream-kmsan-gce
2019/04/23 23:57 https://github.com/google/kmsan.git master 199a02db1f61 4d3d6a50 .config console log report ci-upstream-kmsan-gce
2019/04/23 03:03 https://github.com/google/kmsan.git master 199a02db1f61 53199d6e .config console log report ci-upstream-kmsan-gce
2019/04/22 00:10 https://github.com/google/kmsan.git master 199a02db1f61 b0e8efcb .config console log report ci-upstream-kmsan-gce
2019/04/21 06:05 https://github.com/google/kmsan.git master 199a02db1f61 b0e8efcb .config console log report ci-upstream-kmsan-gce
2019/04/20 20:13 https://github.com/google/kmsan.git master 199a02db1f61 b0e8efcb .config console log report ci-upstream-kmsan-gce
2019/04/19 05:05 https://github.com/google/kmsan.git master 199a02db1f61 b0e8efcb .config console log report ci-upstream-kmsan-gce
2019/04/18 22:49 https://github.com/google/kmsan.git master 199a02db1f61 b0e8efcb .config console log report ci-upstream-kmsan-gce
2019/04/18 05:55 https://github.com/google/kmsan.git master 199a02db1f61 b0e8efcb .config console log report ci-upstream-kmsan-gce
2019/04/18 04:22 https://github.com/google/kmsan.git master 199a02db1f61 b0e8efcb .config console log report ci-upstream-kmsan-gce
2019/04/17 23:11 https://github.com/google/kmsan.git master 199a02db1f61 b0e8efcb .config console log report ci-upstream-kmsan-gce
2019/04/14 04:51 https://github.com/google/kmsan.git master 199a02db1f61 c402d8f1 .config console log report ci-upstream-kmsan-gce
2019/03/30 21:09 https://github.com/google/kmsan.git master 088c01ea0855 c35ee0ea .config console log report ci-upstream-kmsan-gce
2019/03/30 21:06 https://github.com/google/kmsan.git master 088c01ea0855 c35ee0ea .config console log report ci-upstream-kmsan-gce
2019/03/24 10:17 https://github.com/google/kmsan.git master c10a026b8dee acbc5b7d .config console log report ci-upstream-kmsan-gce
2019/03/09 06:11 https://github.com/google/kmsan.git master a695dc5e929e 12365b99 .config console log report ci-upstream-kmsan-gce
2019/03/05 16:25 https://github.com/google/kmsan.git master 6c55aa96dcda bb91cf81 .config console log report ci-upstream-kmsan-gce
2019/01/09 15:42 https://github.com/google/kmsan.git master 48128c3ca084 45c0c1b1 .config console log report ci-upstream-kmsan-gce
2019/01/08 18:52 https://github.com/google/kmsan.git master 48128c3ca084 37dd2683 .config console log report ci-upstream-kmsan-gce
2018/12/26 14:04 https://github.com/google/kmsan.git master 79fc24ff6184 8a41a0ad .config console log report ci-upstream-kmsan-gce
2018/12/23 13:15 https://github.com/google/kmsan.git master 75b3ad224f19 e3bd7ab8 .config console log report ci-upstream-kmsan-gce
2018/12/17 16:38 https://github.com/google/kmsan.git master 0a602458c72c def91db3 .config console log report ci-upstream-kmsan-gce
2018/12/14 00:55 https://github.com/google/kmsan.git master 0a602458c72c fe7127be .config console log report ci-upstream-kmsan-gce
2018/12/13 05:47 https://github.com/google/kmsan.git master 42db043be545 02613a41 .config console log report ci-upstream-kmsan-gce
2018/12/08 04:39 https://github.com/google/kmsan.git master 3f06bda61398 65ed2472 .config console log report ci-upstream-kmsan-gce
2018/12/07 13:12 https://github.com/google/kmsan.git master b1415a86bc68 1eb6a7e4 .config console log report ci-upstream-kmsan-gce
2018/12/06 09:31 https://github.com/google/kmsan.git master 6f0597832d81 764b42c4 .config console log report ci-upstream-kmsan-gce
2018/12/05 07:06 https://github.com/google/kmsan.git master 00f99f811392 f162ad97 .config console log report ci-upstream-kmsan-gce
2018/12/03 16:23 https://github.com/google/kmsan.git master 1d3abf0f2b29 819002b0 .config console log report ci-upstream-kmsan-gce
2018/11/30 19:43 https://github.com/google/kmsan.git master 3a68698849b6 ade12e91 .config console log report ci-upstream-kmsan-gce
2018/11/27 08:08 https://github.com/google/kmsan.git master fffec98ae2a6 ac912200 .config console log report ci-upstream-kmsan-gce
2018/11/25 00:55 https://github.com/google/kmsan.git master fffec98ae2a6 ecc7c870 .config console log report ci-upstream-kmsan-gce
2018/11/21 13:30 https://github.com/google/kmsan.git master 598a88bc28d3 5d9a3924 .config console log report ci-upstream-kmsan-gce
2018/11/21 00:16 https://github.com/google/kmsan.git master 0891758b8cda 9aca6b52 .config console log report ci-upstream-kmsan-gce
2018/07/09 18:50 https://github.com/google/kmsan.git master 85c225c088f5 f25e5770 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.