[stunnel-users] 4.10 runtime crash (alignment error?) in Solaris 7

Fri Jun 24 10:57:49 CEST 2005

When I run stunnel 4.10 with openssl 0.9.8 beta4 in Solaris 7, it
crashes just after a connection is established.
Nothing appears in the stunnel log. If I run it in foreground mode, "Bus
Error" appears on the console.
Running with 'truss -f', I see the output that follows. Gdb reveals
nothing (it's not compiled for debug and I"m not sure how to change that).

so_socket(2, 2, 0, "", 1)                       = 9
fcntl(9, F_GETFL, 0x00000000)                   = 2
fstat64(9, 0x001686B8)                          = 0
getsockopt(9, 65535, 8192, 0x001687B8, 0x001687B0, 0) = 0
fstat64(9, 0x001686B8)                          = 0
getsockopt(9, 65535, 8192, 0x001687B8, 0x001687B4, 0) = 0
setsockopt(9, 65535, 8192, 0x001687B8, 4, 0)    = 0
fcntl(9, F_SETFL, 0x00000082)                   = 0
time()                                          = 1118632479
getpid()                                        = 25472 [25471]
write(3, " 2 0 0 5 . 0 6 . 1 3   1".., 61)      = 61
time()                                          = 1118632479
getpid()                                        = 25472 [25471]
write(3, " 2 0 0 5 . 0 6 . 1 3   1".., 78)      = 78
connect(9, 0x00168998, 16, 1)                   = 0
time()                                          = 1118632479
getpid()                                        = 25472 [25471]
write(3, " 2 0 0 5 . 0 6 . 1 3   1".., 59)      = 59
    Incurred fault #5, FLTACCESS  %pc = 0x00031720
      siginfo: SIGBUS BUS_ADRALN addr=0x0002CDE9
    Received signal #10, SIGBUS [default]
      siginfo: SIGBUS BUS_ADRALN addr=0x0002CDE9
        *** process killed ***

The stunnel options are:
stunnel 4.10 on sparc-sun-solaris2.7 UCONTEXT+POLL+IPv4 with OpenSSL
0.9.8-beta4 06 Jun 2005

Global options
cert            = /u/etc/stunnel/stunnel.pem
ciphers         = ALL:!ADH:+RC4:@STRENGTH
debug           = 5
key             = /u/etc/stunnel/stunnel.pem
pid             = /u/var/run/stunnel.pid
RNDbytes        = 64
RNDoverwrite    = yes
session         = 300 seconds
verify          = none

Service-level options
TIMEOUTbusy     = 300 seconds
TIMEOUTclose    = 60 seconds
TIMEOUTconnect  = 10 seconds
TIMEOUTidle     = 43200 seconds

Also, I had some warnings errors during compilation , which should be
fixed (compiling with gcc 3.4.1 in pedantic mode). (None of them are the
cause of the crash though, as I hacked up some fixes and the crash still
happened).

log.c: In function `s_log':
log.c:134: warning: implicit declaration of function `localtime_r'
log.c:134: warning: assignment makes pointer from integer without a cast

The culprit here is that config.h defines HAVE_LOCALTIME_R, but when the
system header with that function is included, the #defines are set up so
that localtime_r is NOT defined. (I guess this is an autoconf problem).
The code links successfully but I'm not sure how reliable it will be,
since localtime_r was not declared properly.

options.c and network: there were many uses of isspace() with a (signed)
char value, this is incorrect (isspace requires an unsigned char value
-- it could fail if it gets a negative number).
However many C libraries (eg. glibc) work with negative values anyway,
although I have used compilers that don't.

resolver.c has some cases of potential alignment errors, but I guess
they aren't a problem in this case.