[issue536] Savecore broken?

Matthew Dillon dillon at apollo.backplane.com
Fri Jan 26 11:00:39 PST 2007

:Okay, the files are in my crash directory on leaf.  I also gave you my
:libiconv, libmchain, and smbfs kernel modules because they have to be
:loaded in order to use mount_smbfs.  For future reference, do you really
:need those kernel modules to do your debugging?

    Ok, here is the backtrace:

    at /usr/src/sys/platform/pc32/i386/trap.c:1085
#8  0xc02b9748 in trap_pfault (frame=0xcefecab8, usermode=0, eva=6)
    at /usr/src/sys/platform/pc32/i386/trap.c:991
#9  0xc02b9c68 in trap (frame=0xcefecab8)
    at /usr/src/sys/platform/pc32/i386/trap.c:674
#10 0xc02abc36 in calltrap ()
    at /usr/src/sys/platform/pc32/i386/exception.s:783
#11 0xc0290de7 in strcmp (s1=0xcefecb28 "xlat", 
    s2=0x6 <Address 0x6 out of bounds>) at /usr/src/sys/libkern/strcmp.c:48
#12 0xced388f3 in iconv_sysctl_add (oidp=0xced392c0, arg1=0x0, arg2=0, 
    req=0xcefecbf0) at /usr/src/sys/libiconv/iconv.c:146
#13 0xc019a5fa in sysctl_root (oidp=Variable "oidp" is not available.
) at /usr/src/sys/kern/kern_sysctl.c:1194
#14 0xc019a70d in userland_sysctl (name=0xcefecc78, namelen=3, old=0xbfbfef9c, 
    oldlenp=0xbfbfef98, inkernel=0, new=0xbfbfefa0, newlen=108, 
---Type <return> to continue, or q <return> to quit---q

    I think it may be bounds checking on the iconv_add_in structure. 

    Please try this patch.   If it doesn't work we will need to add more
    debugging there to figure out why it is failing.

					Matthew Dillon 
					<dillon at backplane.com>

Index: libiconv/iconv.c
RCS file: /cvs/src/sys/libiconv/iconv.c,v
retrieving revision 1.5
diff -u -r1.5 iconv.c
--- libiconv/iconv.c	5 Sep 2006 00:55:46 -0000	1.5
+++ libiconv/iconv.c	26 Jan 2007 18:50:41 -0000
@@ -354,6 +354,11 @@
 		return EINVAL;
 	if (din.ia_datalen > ICONV_CSMAXDATALEN)
 		return EINVAL;
+	din.ia_converter[ICONV_CNVNMAXLEN-1] = 0;
+	din.ia_to[ICONV_CSNMAXLEN-1] = 0;
+	din.ia_from[ICONV_CSNMAXLEN-1] = 0;
 	if (iconv_lookupconv(din.ia_converter, &dcp) != 0)
 		return EINVAL;
 	error = iconv_register_cspair(din.ia_to, din.ia_from, dcp, NULL, &csp);

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