Al Viro <v...@zeniv.linux.org.uk> writes: > On Sun, Sep 23, 2012 at 07:30:38AM +0100, Al Viro wrote: >> On Sat, Sep 22, 2012 at 10:59:04PM -0700, Eric W. Biederman wrote: >> >> > The test: >> > >> + if (filp->f_vfsmnt->mnt_root == filp->f_dentry) >> > kicks in and no redirection is performed. >> >> Umm... OK, after the first round of recursion. Unless you bind >> /something/pts >> on /something. > > Other way round, of course... E.g. > mount --bind /dev /dev/pts > mount --bind /dev /dev/pts/pts > etc. enough times to overflow the kernel stack on recursion.
Except of course I gave the wrong explanation. I did the open with O_PATH. Since O_PATH never calls open recursion is impossible. Eric -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
