RFR(S): 8009397 test/com/sun/jdi/PrivateTransportTest.sh: ERROR: transport library missing onLoad entry: private_dt_socket (original) (raw)

serguei.spitsyn at oracle.com serguei.spitsyn at oracle.com
Tue Mar 5 19:26:49 UTC 2013

Hi Staffan,

Thank you for this discovery! It looks good, but I have a couple of comments.

It seems, there is one more problem in this code:

68 /* check for NULL path */ 69 if (p == pathname) { 70 continue;<== Endless loop if we hit this line 71 }

Do we need to do 'pathname++' before continuing at the line #70? It is going to be endless loop in cases there is a PATH_SEPARATOR at the beginning of paths or two PATH_SEPARATOR's in a row. These would be incorrect path lists but the code above is targeting exactly such cases.

Also, the argument name "pathname" in the original code is confusing. Should we rename it to "pathnames"?

Thanks, Serguei

On 3/4/13 10:56 AM, Staffan Larsen wrote:

I accidentally stepped on this bug the other day. There is a problem in linkermd.c : dllbuildname() where an internal pointer can be moved to point outside the string. The code looks like:

57 static void dllbuildname(char* buffer, sizet buflen, 58 const char* pname, const char* fname) { 59 // Based on ossolaris.cpp 60 61 char *pathsep = PATHSEPARATOR; 62 char *pathname = (char *)pname; 63 while (strlen(pathname) > 0) { 64 char *p = strchr(pathname, *pathsep); 65 if (p == NULL) { 66 p = pathname + strlen(pathname); 67 } 68 /* check for NULL path */ 69 if (p == pathname) { 70 continue; 71 } 72 (void)snprintf(buffer, buflen, "%.*s/lib%s." LIBSUFFIX, (p - pathname), 73 pathname, fname); 74 75 if (access(buffer, FOK) == 0) { 76 break; 77 } 78 pathname = p + 1; 79 *buffer = '\0'; 80 } If the supplied pname is a buffer with a simple path without any path separators in it, p will be set to the terminating nul on line 66. Then on line 78 it will be moved outside the buffer. Fixing this also necessitates fixes to the callers to check for an empty return string (in buffer). The same code show up in both the solaris code and the windows code as well as hprof. bug: http://bugs.sun.com/viewbug.do?bugid=8009397 webrev: http://cr.openjdk.java.net/~sla/8009397/webrev.00/ Thanks, /Staffan

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