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Date: Tue, 23 Jan 2018 17:07:32 -0800 (PST)
From: Po-yi Wang <player@....bc.ca>
To: musl@...ts.openwall.com
Subject: seg fault at src/string/strlen.c:15

hi

I try to compile make-4.1 for i486,ppc,arm targets.
i486 seem ok. "make --version" runs and no problem.
for ppc and arm targets, both seg fault at exactly the same place.
I had to recompile musl-1.1.18 for both with "-g3" to narrow down the 
problem. it should be easy to reproduce. here is some outputs:

[ppc][1] cd /build/make-4.1; file make
make: ELF 32-bit MSB executable, PowerPC or cisco 4500, version 1 (SYSV), 
statically linked, not stripped
[ppc][1] cd /build/make-4.1; cp make make-4.1 
[ppc][1] cd /build/make-4.1; gdb make-4.1
GNU gdb 6.5
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you 
are
welcome to change it and/or distribute copies of it under certain 
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for 
details.
This GDB was configured as "powerpc-unknown-linux-gnu"...Using host 
libthread_db library "/lib/libthread_db.so.1".

(gdb) run --version
Starting program: /tmp/build/make-4.1/make-4.1 --version

Program received signal SIGSEGV, Segmentation fault.
strlen (s=0x0) at src/string/strlen.c:15
15              for (w = (const void *)s; !HASZERO(*w); w++);
(gdb)


output for arm target:

GNU gdb (GDB) 8.0
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "armv7l-unknown-linux-gnueabi".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from make-4.1...done.
(gdb) run --version
Starting program: /tmp/build/make-4.1/make-4.1 --version

Program received signal SIGSEGV, Segmentation fault.
0x0002c3a0 in strlen (s=<optimized out>, s@...ry=0x0) at 
src/string/strlen.c:15
15              for (w = (const void *)s; !HASZERO(*w); w++);
(gdb)

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