Date: Mon, 10 Jan 2022 23:33:58 -0800 From: Mark Millard <marklmi@yahoo.com> To: freebsd-current <freebsd-current@freebsd.org> Subject: UBSAN report for main [so: 14] /usr/sbin/traceroute: various misaligned address reports Message-ID: <22B1E944-641D-4BD3-A4B2-384767D966FC@yahoo.com> References: <22B1E944-641D-4BD3-A4B2-384767D966FC.ref@yahoo.com>
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I tried a /usr/sbin/traceroute from a chroot that had been built using
WITH_UBSAN=3D in use. It got the common lib/libc/stdio/fread.c zero =
offset
to null pointer notice but also reported "member access within =
misaligned
address" for types:
'struct ifreq', which requires 8 byte alignment
'union (unnamed union at =
/usr/obj/BUILDs/main-amd64-nodbg-clang-alt/usr/main-src/amd64.amd64/tmp/us=
r/include/net/if.h:398:2)', which requires 8 byte alignment
'struct sockaddr', which requires 8 byte alignment
'unsigned char', which requires 8 byte alignment
The reports are:
/usr/main-src/lib/libc/stdio/fread.c:133:10: runtime error: applying =
zero offset to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior =
/usr/main-src/lib/libc/stdio/fread.c:133:10 in=20
/usr/main-src/contrib/traceroute/ifaddrlist.c:113:13: runtime error: =
member access within misaligned address 0x7fffffff55fc for type 'struct =
ifreq', which requires 8 byte alignment
0x7fffffff55fc: note: pointer points here
00 00 00 00 6c 6f 30 00 00 00 00 00 00 00 00 00 00 00 00 00 1c 1c 00 =
00 00 00 00 00 fe 80 00 02
^=20
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior =
/usr/main-src/contrib/traceroute/ifaddrlist.c:113:13 in=20
/usr/main-src/contrib/traceroute/ifaddrlist.c:113:13: runtime error: =
member access within misaligned address 0x7fffffff560c for type 'union =
(unnamed union at =
/usr/obj/BUILDs/main-amd64-nodbg-clang-alt/usr/main-src/amd64.amd64/tmp/us=
r/include/net/if.h:398:2)', which requires 8 byte alignment
0x7fffffff560c: note: pointer points here
00 00 00 00 1c 1c 00 00 00 00 00 00 fe 80 00 02 00 00 00 00 00 00 00 =
00 00 00 00 01 00 00 00 00
^=20
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior =
/usr/main-src/contrib/traceroute/ifaddrlist.c:113:13 in=20
/usr/main-src/contrib/traceroute/ifaddrlist.c:113:13: runtime error: =
member access within misaligned address 0x7fffffff560c for type 'struct =
sockaddr', which requires 8 byte alignment
0x7fffffff560c: note: pointer points here
00 00 00 00 1c 1c 00 00 00 00 00 00 fe 80 00 02 00 00 00 00 00 00 00 =
00 00 00 00 01 00 00 00 00
^=20
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior =
/usr/main-src/contrib/traceroute/ifaddrlist.c:113:13 in=20
/usr/main-src/contrib/traceroute/ifaddrlist.c:113:22: runtime error: =
load of misaligned address 0x7fffffff560c for type 'unsigned char', =
which requires 8 byte alignment
0x7fffffff560c: note: pointer points here
00 00 00 00 1c 1c 00 00 00 00 00 00 fe 80 00 02 00 00 00 00 00 00 00 =
00 00 00 00 01 00 00 00 00
^=20
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior =
/usr/main-src/contrib/traceroute/ifaddrlist.c:113:22 in=20
/usr/main-src/contrib/traceroute/ifaddrlist.c:118:13: runtime error: =
member access within misaligned address 0x7fffffff55fc for type 'struct =
ifreq', which requires 8 byte alignment
0x7fffffff55fc: note: pointer points here
00 00 00 00 6c 6f 30 00 00 00 00 00 00 00 00 00 00 00 00 00 1c 1c 00 =
00 00 00 00 00 fe 80 00 02
^=20
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior =
/usr/main-src/contrib/traceroute/ifaddrlist.c:118:13 in=20
/usr/main-src/contrib/traceroute/ifaddrlist.c:118:13: runtime error: =
member access within misaligned address 0x7fffffff560c for type 'union =
(unnamed union at =
/usr/obj/BUILDs/main-amd64-nodbg-clang-alt/usr/main-src/amd64.amd64/tmp/us=
r/include/net/if.h:398:2)', which requires 8 byte alignment
0x7fffffff560c: note: pointer points here
00 00 00 00 1c 1c 00 00 00 00 00 00 fe 80 00 02 00 00 00 00 00 00 00 =
00 00 00 00 01 00 00 00 00
^=20
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior =
/usr/main-src/contrib/traceroute/ifaddrlist.c:118:13 in=20
/usr/main-src/contrib/traceroute/ifaddrlist.c:118:13: runtime error: =
member access within misaligned address 0x7fffffff560c for type 'struct =
sockaddr', which requires 8 byte alignment
0x7fffffff560c: note: pointer points here
00 00 00 00 1c 1c 00 00 00 00 00 00 fe 80 00 02 00 00 00 00 00 00 00 =
00 00 00 00 01 00 00 00 00
^=20
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior =
/usr/main-src/contrib/traceroute/ifaddrlist.c:118:13 in=20
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
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