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[Info-mtools] segfault in 4.0.29 mcopy

From: Natanael Copa
Subject: [Info-mtools] segfault in 4.0.29 mcopy
Date: Mon, 7 Jun 2021 10:40:29 +0200


I am about to make a release candidate of alpine linux 3.14, but bumped into a 
segfault on 32 bit x86:

Here is the backtrace:

Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/mcopy...
Reading symbols from /usr/lib/debug//usr/bin/mtools.debug...

warning: core file may not match specified executable file.
[New LWP 7584]
Core was generated by `mcopy -i 
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x566013d2 in force_read (Stream=0xf7ee4711 <get_stride+5>, buf=0xffc7a08c 
"", start=0, len=512) at force_io.c:61
61              return force_io(Stream, buf, start, len,
(gdb) bt
#0  0x566013d2 in force_read (Stream=0xf7ee4711 <get_stride+5>, buf=0xffc7a08c 
"", start=0, len=512) at force_io.c:61
#1  0x56601c6c in read_boot (size=512, boot=0xffc7a08c, Stream=<optimized out>) 
at init.c:50
#2  try_device (errmsg=0xffc79f14 "Drive '::' not supported", try_writable=0, 
isRop=<synthetic pointer>, maxSize=0xffc7a038, 
    out_dev=0xffc7a040, mode=2, dev=0xf7f58940) at init.c:223
#3  find_device (drive=58 ':', mode=2, out_dev=0xffc7a040, boot=0xffc7a08c, 
    media=0xffc7a034, maxSize=0xffc7a038, isRop=0x0) at init.c:308
#4  0x56601ed1 in fs_init (drive=58 ':', mode=2, isRop=0x0) at init.c:357
#5  0x56610ea2 in open_root_dir (drive=58 ':', flags=2, isRop=0x0) at 
#6  0x56603059 in common_dos_loop (mp=mp@entry=0xffc7b9f0, pathname=0xffc7cd04 
"", pathname@entry=0xffc7cd02 "::", 
    lookupState=lookupState@entry=0xffc7b968, open_mode=2) at mainloop.c:452
#7  0x566032ea in dos_target_lookup (arg=0xffc7cd02 "::", mp=0xffc7b9f0) at 
#8  target_lookup (mp=0xffc7b9f0, arg=0xffc7cd02 "::") at mainloop.c:536
#9  0x5660602e in mcopy (argc=5, argv=0xffc7bff4, mtype=0) at mcopy.c:615
#10 0x565faab2 in main (argc=<optimized out>, argv=0xffc7bff4) at mtools.c:184

Note that this is built with musl libc.

I was not able to find any public git repository to investigate the change 


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