Bug 92889
| Summary: | [libc] xdr double buffer overflow | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Menshutin Anton <may> |
| Component: | amd64 | Assignee: | freebsd-amd64 (Nobody) <amd64> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | ||
| Priority: | Normal | ||
| Version: | Unspecified | ||
| Hardware: | Any | ||
| OS: | Any | ||
I cannot reproduce this. I'm using pvm-3.4.5_2 from ports. I couldn't figure out how to run the master and slave on the same machine, so I ran the master on an i386 Linux box (debian unstable, with pvm 3.4.5-9) and the slave on FreeBSD 6.2-RELEASE-p7/amd64, and master and slave produce the same output. I also tried sending the data the other way with the same result. -- Nate Eldredge nge@cs.hmc.edu State Changed From-To: open->feedback Note that submitter was asked for feedback quite some time ago. This bug seems to be already resolved. I tested it under 6.2 and 7.0 and everything seems to be ok now. State Changed From-To: feedback->closed Submitter says that this is now fixed. |
Problem in xdr functions from libc on amd64. Sending doubles or floats with pvm library causes out of range access in receiving program. First 4 bytes of double are being received correctly (when sending from i386 machine) but the last 4 bytes come to the wrong place, owerwriting 4 bytes memory AFTER the double. Seems to be a problem with libc xdr packing/ unpacking functions. How-To-Repeat: Write a simple test program sending double from one host to another. //test_pvm.c #include <stdio.h> #include "pvm3.h" char *hostname="localhost"; //hostname where to run slave char buf[1024]; int main() { int tid; pvm_catchout(stdout); pvm_spawn("test_pvm_slave",NULL,PvmTaskHost, hostname,1,&tid); pvm_initsend(PvmDataDefault); double t=0.123; double *p; int i; unsigned int k; p=buf; *p=t; printf("Data before sending:"); for (i=0;i<16;i++) { printf("%hhu ",buf[i]); } printf("\n"); pvm_pkdouble(p,1,1); pvm_send(tid,0); pvm_exit(); return(0); } //test_pvm_slave.c #include "pvm3.h" #include <stdio.h> char buf[1024]; int main() { int tid; double t=0.123; double *p; int i; fprintf(stderr,"I am slave\n"); pvm_recv(pvm_parent(),0); p=buf; pvm_upkdouble(p,1,1); t=*p; for (i=0;i<16;i++) { printf("%hhu ",buf[i]); } printf("\n"); pvm_exit(); return(0); }