Ok, this actually is a bug in libpam-smbpass, not in swat.
When recompiling the packages with debug info, the backtrace from swat
is:
#0 0xb7217600 in ?? ()
#1 0xb7d7923c in _talloc_free () from /usr/lib/i386-linux-gnu/libtalloc.so.2
#2 0x8027fae1 in smb_iconv_close (cd=0x8081f768) at
../lib/util/charset/iconv.c:337
#3 0x8026ee61 in close_iconv_convenience (data=0x80812228) at
../lib/util/charset/codepoints.c:203
#4 0x8026f08c in smb_iconv_convenience_reinit (mem_ctx=0x0,
dos_charset=0x80816c08 "CP850", unix_charset=0x80816bc8 "UTF-8",
display_charset=0xb745930c "UTF-8", native_iconv=true, old_ic=0x80812228)
at ../lib/util/charset/codepoints.c:265
#5 0x8025b037 in init_iconv () at lib/charcnv.c:78
#6 0x8025af8c in lazy_initialize_conv () at lib/charcnv.c:55
#7 0x8025bb59 in convert_string_talloc (ctx=0x80816b90, from=CH_UTF8,
to=CH_UNIX, src=0x8081cd60, srclen=9, dst=0xbffff670,
converted_size=0xbffff674,
allow_bad_conv=true) at lib/charcnv.c:480
#8 0x8007207d in cgi_load_variables () at web/cgi.c:214
#9 0x80079c4c in main (argc=1, argv=0xbffff824) at web/swat.c:1581
Note the call to close_iconv_convenience() in frame 3.
Now, when looking at libpam-smbpass.so symbols with nm, this gives the
following iconv-related output:
0008fe20 t close_iconv_convenience
0008fd4c T get_iconv_convenience
00207a80 B global_iconv_convenience
U iconv@@GLIBC_2.1
U iconv_close@@GLIBC_2.1
000a111b t iconv_copy
U iconv_open@@GLIBC_2.1
000a1057 t iconv_swab
0007c01a T init_iconv
000a0364 t lazy_initialize_iconv
000a03ff T smb_iconv
000a0af6 T smb_iconv_close
00090085 T smb_iconv_convenience_reinit
000a0abc T smb_iconv_open
000a0686 T smb_iconv_open_ex
000a0600 t smb_iconv_t_destructor
000a0389 t sys_iconv
Again, note the t close_iconv_convenience, which as far as I understand says
that libpam-smbpass contains close_iconv_convenience in it's text section, so
there's a copy of that call in libpam-smbpass.
Now, if libpam-smbpass is loaded, it seems like swat uses the wrong version of
that call, and things go wrong.
If you comment out the libpam-smbpass line in /etc/pam.d/common-auth, The crash
is gone.
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https://bugs.launchpad.net/bugs/1015935
Title:
SWAT segfaults when trying to view full configuration
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