stracing the installation of sudo package, trips the bug on a chown()
call. From the strace'd code I've got a stripped down minimal C program
below reliably breaks it the same way. Definitely due to the hard
linked file and chown32 system call on the file on unionfs. Got some
hard evidence now. C code below:
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
void main(void)
{
int fd;
fd = open("/usr/bin/sudoedit.dpkg-new", O_WRONLY|O_CREAT|O_EXCL, 0);
fchown(fd, 0, 0);
fchmod(fd, 04755);
close(fd);
link("/usr/bin/sudoedit", "/usr/bin/sudoedit.dpkg-tmp");
rename("/usr/bin/sudoedit.dpkg-new", "/usr/bin/sudoedit");
link("/./usr/bin/sudoedit", "/usr/bin/sudo.dpkg-new");
chown("/usr/bin/sudo.dpkg-new", 0, 0);
}
Incidentally, removing the fchown and fchmod from above and the bug goes
away.
--
BUG ON crash probably due to unionfs when installing sudo update with dpkg
https://bugs.launchpad.net/bugs/224754
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