[issue2009] POSIX message queue malloc zone overflow

New submission from Venkatesh Srinivas <[e-mail]>:

#include <sys/types.h>
#include <mqueue.h>

int main() {
int i;
static struct mq_attr attr;
attr.mq_maxmsg=31;
attr.mq_msgsize=128;
char nam[300] = {};
int pidr;

for (i = 0; i < 128; i++) {
pidr = fork();
if(pidr == 0)
goto co;
}

co:
for (i = 0; i < 900; i++) {
sprintf(nam, "%d-%228d", i,getpid());
mq_unlink(nam);
if (mq_open(nam, O_RDWR|O_CREAT|O_EXCL, 0777, &attr) == -1)
break;
}

pause();
}


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The above program will hit a panic on a malloc zone overflow in sys_mqueue.c.

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messages: 9667
nosy: vsrinivas
status: unread
title: POSIX message queue malloc zone overflow

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DragonFly issue tracker <[e-mail]>
<http://bugs.dragonflybsd.org/issue2009>
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