Date:   Wed, 6 Sep 2017 19:23:37 +0200
From:   Toralf Förster <toralf.foerster@....de>
To:     Linux Kernel <linux-kernel@...r.kernel.org>
Subject: UBSAN: Undefined behaviour in ./arch/x86/include/asm/futex.h:53:13

I catched the following UBSAN spew at a stable Gentoo Linux server with hardened tool chain (.config attached) :

FWIW - The lines before the UBSAN might be completely unrelated - I'm unsure.
They do come from the build bot [1] I do run at that machine for Gentoo.

Sep  6 02:18:43 mr-fox kernel: [182842.823403] readonly.exe[3354]: segfault at 400518 ip 000000000040048f sp 00007ffc527356f0 error 7 in readonly.exe[400000+1000]
Sep  6 02:19:07 mr-fox kernel: [182867.599599] readonly.exe[20803]: segfault at 400518 ip 000000000040048f sp 00007ffd2f10ab60 error 7 in readonly.exe[400000+1000]
Sep  6 02:29:21 mr-fox kernel: [183481.309291] readonly.exe[5057]: segfault at 400518 ip 000000000040048f sp 00007ffccf238df0 error 7 in readonly.exe[400000+1000]
Sep  6 05:00:43 mr-fox kernel: [192563.296629] ThreadTest[31675]: segfault at 0 ip 0000000000407967 sp 00007fbdb22d5ea0 error 4 in ThreadTest[400000+d000]
Sep  6 05:00:44 mr-fox kernel: [192564.438163] ThreadTest[32629]: segfault at 0 ip 0000000000407967 sp 00007f3426479ea0 error 4 in ThreadTest[400000+d000]
Sep  6 05:00:45 mr-fox kernel: [192565.289479] ThreadTest[790]: segfault at 0 ip 0000000000407967 sp 00007fafb495cea0 error 4 in ThreadTest[400000+d000]
Sep  6 05:00:46 mr-fox kernel: [192566.645458] ThreadTest[1725]: segfault at 0 ip 0000000000407967 sp 00007f6007ffeea0 error 4 in ThreadTest[400000+d000]
Sep  6 05:00:47 mr-fox kernel: [192567.340325] ThreadTest[2056]: segfault at 0 ip 00007f9d4eea33cc sp 00007f9d4ca4ad00 error 4 in libxerces-c-3.1.so[7f9d4ed4f000+33a000]
Sep  6 05:00:49 mr-fox kernel: [192568.879404] ThreadTest[3237]: segfault at 0 ip 0000000000407967 sp 00007f35d9378ea0 error 4 in ThreadTest[400000+d000]
Sep  6 05:00:49 mr-fox kernel: [192568.921071] ThreadTest[3295]: segfault at 0 ip 00007fd21fe2a3cc sp 00007fd21b9cdd00 error 4 in libxerces-c-3.1.so[7fd21fcd6000+33a000]
Sep  6 06:00:27 mr-fox kernel: [196147.270993] TCP: request_sock_TCPv6: Possible SYN flooding on port 45651. Sending cookies.  Check SNMP counters.
Sep  6 06:53:13 mr-fox kernel: [199312.923377] tiff_read_bw[3757]: segfault at 1c50 ip 0000000000400f5d sp 00007fffa9abc950 error 4 in tiff_read_bw[400000+3000]
Sep  6 08:02:32 mr-fox kernel: [203471.959326] lt-IlmCtlTest[21137]: segfault at 8 ip 00007f9490d0fcd0 sp 00007fff4adf6fc0 error 4 in libIlmCtlSimd.so.2.0.0[7f9490cd3000+168000]
Sep  6 08:36:01 mr-fox kernel: [205480.927067] kworker/dying (9366) used greatest stack depth: 9384 bytes left
Sep  6 11:24:41 mr-fox kernel: [215601.542468] ling_example[13697]: segfault at 0 ip 00007f8616e077b6 sp 00007ffdf64bda00 error 4 in libestbase.so.2.1.1[7f8616d09000+253000]
Sep  6 11:24:41 mr-fox kernel: [215601.561549] ling_regression[13709]: segfault at 0 ip 00007faff2d267b6 sp 00007fff35129530 error 4 in libestbase.so.2.1.1[7faff2c28000+253000]
Sep  6 11:24:44 mr-fox kernel: [215604.598147] ch_wave[15951]: segfault at 0 ip 00007f59faae77b6 sp 00007ffd8e4be770 error 4 in libestbase.so.2.1.1[7f59fa9e9000+253000]
Sep  6 11:24:44 mr-fox kernel: [215604.621802] ch_wave[15960]: segfault at 0 ip 00007fa70eb957b6 sp 00007ffd533c8fc0 error 4 in libestbase.so.2.1.1[7fa70ea97000+253000]
Sep  6 11:24:45 mr-fox kernel: [215604.922110] viterbi[16171]: segfault at 0 ip 00007f4503df27b6 sp 00007fffcde7d030 error 4 in libestbase.so.2.1.1[7f4503cf4000+253000]
Sep  6 13:22:47 mr-fox kernel: [222687.240207] capability: warning: `caps' uses deprecated v2 capabilities in a way that may be insecure
Sep  6 13:22:47 mr-fox kernel: [222687.240213] capability: warning: `caps' uses 32-bit capabilities (legacy support in use)
Sep  6 13:22:48 mr-fox kernel: [222687.825742] execve[16964]: segfault at fffffffffffffff0 ip 00007f706beec1bb sp 00007ffc8ec20068 error 5 in libc-2.25.so[7f706bdb6000+1a8000]
Sep  6 13:23:20 mr-fox kernel: [222720.041895] execve[26054]: segfault at fffffffffffffff0 ip 00007fcdf24011bb sp 00007ffc9a2624f8 error 5 in libc-2.25.so[7fcdf22cb000+1a8000]
Sep  6 13:23:20 mr-fox kernel: [222720.100918] mmap: remap_file_page (26074) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.
Sep  6 13:23:22 mr-fox kernel: [222722.772032] execve[27083]: segfault at fffffffffffffff0 ip 00007f2742f041bb sp 00007fff5d8d3408 error 5 in libc-2.25.so[7f2742dce000+1a8000]
Sep  6 13:23:30 mr-fox kernel: [222730.428190] execve[29792]: segfault at fffffffffffffff0 ip 00007fc3f8f361bb sp 00007fffc9c90238 error 5 in libc-2.25.so[7fc3f8e00000+1a8000]
Sep  6 13:23:32 mr-fox kernel: [222732.084648] execve[30195]: segfault at fffffffffffffff0 ip 00007f763af981bb sp 00007ffe5672bb08 error 5 in libc-2.25.so[7f763ae62000+1a8000]
Sep  6 13:23:34 mr-fox kernel: [222734.012531] execve[30632]: segfault at fffffffffffffff0 ip 00007f30fdfad1bb sp 00007ffc8b9f48e8 error 5 in libc-2.25.so[7f30fde77000+1a8000]
Sep  6 13:23:35 mr-fox kernel: [222735.744645] execve[31002]: segfault at fffffffffffffff0 ip 00007fa955bd41bb sp 00007ffef0550678 error 5 in libc-2.25.so[7fa955a9e000+1a8000]
Sep  6 13:23:37 mr-fox kernel: [222737.528766] execve[31766]: segfault at fffffffffffffff0 ip 00007f07ebc101bb sp 00007fff1f228298 error 5 in libc-2.25.so[7f07ebada000+1a8000]
Sep  6 13:23:39 mr-fox kernel: [222739.225957] execve[32260]: segfault at fffffffffffffff0 ip 00007f3c176471bb sp 00007fff9f04cbe8 error 5 in libc-2.25.so[7f3c17511000+1a8000]
Sep  6 13:23:41 mr-fox kernel: [222741.486196] execve-v[546]: segfault at fffffffffffffff0 ip 00007f2fe319d1bb sp 00007fff872d9568 error 5 in libc-2.25.so[7f2fe3067000+1a8000]
Sep  6 13:23:41 mr-fox kernel: [222741.527207] execve[561]: segfault at fffffffffffffff0 ip 00007f6ece2de1bb sp 00007ffcdb970358 error 5 in libc-2.25.so[7f6ece1a8000+1a8000]
Sep  6 13:23:41 mr-fox kernel: [222741.645409] ================================================================================
Sep  6 13:23:41 mr-fox kernel: [222741.645412] UBSAN: Undefined behaviour in ./arch/x86/include/asm/futex.h:53:13
Sep  6 13:23:41 mr-fox kernel: [222741.645413] shift exponent -849 is negative
Sep  6 13:23:41 mr-fox kernel: [222741.645415] CPU: 3 PID: 595 Comm: futex Not tainted 4.13.0 #1
Sep  6 13:23:41 mr-fox kernel: [222741.645416] Hardware name:                  /DX79TO, BIOS SIX7910J.86A.0650.2014.0307.0138 03/07/2014
Sep  6 13:23:41 mr-fox kernel: [222741.645417] Call Trace:
Sep  6 13:23:41 mr-fox kernel: [222741.645423]  dump_stack+0x60/0x9a
Sep  6 13:23:41 mr-fox kernel: [222741.645427]  ? val_is_negative+0x2b/0x50
Sep  6 13:23:41 mr-fox kernel: [222741.645428]  ubsan_epilogue+0xd/0x40
Sep  6 13:23:41 mr-fox kernel: [222741.645430]  __ubsan_handle_shift_out_of_bounds+0x10d/0x170
Sep  6 13:23:41 mr-fox kernel: [222741.645433]  ? get_futex_key+0x38a/0x6e0
Sep  6 13:23:41 mr-fox kernel: [222741.645434]  do_futex+0xd72/0x1380
Sep  6 13:23:41 mr-fox kernel: [222741.645435]  ? do_futex+0xd72/0x1380
Sep  6 13:23:41 mr-fox kernel: [222741.645436]  SyS_futex+0x7a/0x180
Sep  6 13:23:41 mr-fox kernel: [222741.645438]  ? SyS_write+0x4f/0xc0
Sep  6 13:23:41 mr-fox kernel: [222741.645441]  entry_SYSCALL_64_fastpath+0x13/0x94
Sep  6 13:23:41 mr-fox kernel: [222741.645442] RIP: 0033:0x7f321f40e839
Sep  6 13:23:41 mr-fox kernel: [222741.645443] RSP: 002b:00007fff2306c068 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
Sep  6 13:23:41 mr-fox kernel: [222741.645445] RAX: ffffffffffffffda RBX: 00007f321f6c6ae0 RCX: 00007f321f40e839
Sep  6 13:23:41 mr-fox kernel: [222741.645446] RDX: badda7a0facefeed RSI: 0000000000000005 RDI: 00007f321fa95ffc
Sep  6 13:23:41 mr-fox kernel: [222741.645446] RBP: 0000000000001011 R08: 00007f321fa8fffc R09: 00000000a0caffee
Sep  6 13:23:41 mr-fox kernel: [222741.645447] R10: 000000000000000b R11: 0000000000000246 R12: 0000000000000000
Sep  6 13:23:41 mr-fox kernel: [222741.645448] R13: 00007f321f6c6b38 R14: 0000000000000000 R15: 0000000000001030
Sep  6 13:23:41 mr-fox kernel: [222741.645449] ================================================================================

--
Toralf

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