Hi,
We found a problem with programs using unveil() executed by chroot in a
mounted file system.
After the program run, umount of the file system will return with EBUSY.
Simple test program to reproduce the problem:
---------------------------------------------
#include <unistd.h>
#include <err.h>
int main() {
if (unveil("/", "") == -1)
err(1, "Error calling unveil()");
return 0
}
----------------------------------------------
Steps to reproduce:
1. Mount a MFS to /mnt
2. Compile the example program with -static and copy to /mnt
3. Do a chroot /mnt unveil
4. Try to unmount: umount /mnt
The umount command will fail at least with OpenBSD 6.5 and -current with
EBUSY. I haven't tested if the error also exists in 6.4.
As far as we found out, the use counter of the vnode for the directory
seems leaking.
-- Matthias
