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    Subject[PATCH 26/35] Unionfs: Privileged operations workqueue
    Date
    From: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu>

    Workqueue & helper functions used to perform privileged operations on
    behalf of the user process.

    Signed-off-by: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu>
    Signed-off-by: David Quigley <dquigley@fsl.cs.sunysb.edu>
    Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
    ---
    fs/unionfs/sioq.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++
    fs/unionfs/sioq.h | 79 ++++++++++++++++++++++++++++++++++++
    2 files changed, 194 insertions(+), 0 deletions(-)

    diff --git a/fs/unionfs/sioq.c b/fs/unionfs/sioq.c
    new file mode 100644
    index 0000000..187ad87
    --- /dev/null
    +++ b/fs/unionfs/sioq.c
    @@ -0,0 +1,115 @@
    +/*
    + * Copyright (c) 2003-2006 Erez Zadok
    + * Copyright (c) 2003-2006 Charles P. Wright
    + * Copyright (c) 2005-2006 Josef 'Jeff' Sipek
    + * Copyright (c) 2005-2006 Junjiro Okajima
    + * Copyright (c) 2005 Arun M. Krishnakumar
    + * Copyright (c) 2004-2006 David P. Quigley
    + * Copyright (c) 2003-2004 Mohammad Nayyer Zubair
    + * Copyright (c) 2003 Puja Gupta
    + * Copyright (c) 2003 Harikesavan Krishnan
    + * Copyright (c) 2003-2006 Stony Brook University
    + * Copyright (c) 2003-2006 The Research Foundation of State University of New York
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License version 2 as
    + * published by the Free Software Foundation.
    + */
    +
    +#include "union.h"
    +
    +struct workqueue_struct *sioq;
    +
    +int __init init_sioq(void)
    +{
    + int err;
    +
    + sioq = create_workqueue("unionfs_siod");
    + if (!IS_ERR(sioq))
    + return 0;
    +
    + err = PTR_ERR(sioq);
    + printk(KERN_ERR "create_workqueue failed %d\n", err);
    + sioq = NULL;
    + return err;
    +}
    +
    +void fin_sioq(void)
    +{
    + if (sioq)
    + destroy_workqueue(sioq);
    +}
    +
    +void run_sioq(void (*func)(void *arg), struct sioq_args *args)
    +{
    + DECLARE_WORK(wk, func, &args->comp);
    +
    + init_completion(&args->comp);
    + while (!queue_work(sioq, &wk)) {
    + /* TODO: do accounting if needed */
    + schedule();
    + }
    + wait_for_completion(&args->comp);
    +}
    +
    +void __unionfs_create(void *data)
    +{
    + struct sioq_args *args = data;
    + struct create_args *c = &args->create;
    +
    + args->err = vfs_create(c->parent, c->dentry, c->mode, c->nd);
    + complete(&args->comp);
    +}
    +
    +void __unionfs_mkdir(void *data)
    +{
    + struct sioq_args *args = data;
    + struct mkdir_args *m = &args->mkdir;
    +
    + args->err = vfs_mkdir(m->parent, m->dentry, m->mode);
    + complete(&args->comp);
    +}
    +
    +void __unionfs_mknod(void *data)
    +{
    + struct sioq_args *args = data;
    + struct mknod_args *m = &args->mknod;
    +
    + args->err = vfs_mknod(m->parent, m->dentry, m->mode, m->dev);
    + complete(&args->comp);
    +}
    +void __unionfs_symlink(void *data)
    +{
    + struct sioq_args *args = data;
    + struct symlink_args *s = &args->symlink;
    +
    + args->err = vfs_symlink(s->parent, s->dentry, s->symbuf, s->mode);
    + complete(&args->comp);
    +}
    +
    +void __unionfs_unlink(void *data)
    +{
    + struct sioq_args *args = data;
    + struct unlink_args *u = &args->unlink;
    +
    + args->err = vfs_unlink(u->parent, u->dentry);
    + complete(&args->comp);
    +}
    +
    +void __delete_whiteouts(void *data) {
    + struct sioq_args *args = data;
    + struct deletewh_args *d = &args->deletewh;
    +
    + args->err = do_delete_whiteouts(d->dentry, d->bindex, d->namelist);
    + complete(&args->comp);
    +}
    +
    +void __is_opaque_dir(void *data)
    +{
    + struct sioq_args *args = data;
    +
    + args->ret = lookup_one_len(UNIONFS_DIR_OPAQUE, args->isopaque.dentry,
    + sizeof(UNIONFS_DIR_OPAQUE) - 1);
    + complete(&args->comp);
    +}
    +
    diff --git a/fs/unionfs/sioq.h b/fs/unionfs/sioq.h
    new file mode 100644
    index 0000000..628d214
    --- /dev/null
    +++ b/fs/unionfs/sioq.h
    @@ -0,0 +1,79 @@
    +#ifndef _SIOQ_H
    +#define _SIOQ_H
    +
    +struct deletewh_args {
    + struct unionfs_dir_state *namelist;
    + struct dentry *dentry;
    + int bindex;
    +};
    +
    +struct isopaque_args {
    + struct dentry *dentry;
    +};
    +
    +struct create_args {
    + struct inode *parent;
    + struct dentry *dentry;
    + umode_t mode;
    + struct nameidata *nd;
    +};
    +
    +struct mkdir_args {
    + struct inode *parent;
    + struct dentry *dentry;
    + umode_t mode;
    +};
    +
    +struct mknod_args {
    + struct inode *parent;
    + struct dentry *dentry;
    + umode_t mode;
    + dev_t dev;
    +};
    +
    +struct symlink_args {
    + struct inode *parent;
    + struct dentry *dentry;
    + char *symbuf;
    + umode_t mode;
    +};
    +
    +struct unlink_args {
    + struct inode *parent;
    + struct dentry *dentry;
    +};
    +
    +
    +struct sioq_args {
    +
    + struct completion comp;
    + int err;
    + void *ret;
    +
    + union {
    + struct deletewh_args deletewh;
    + struct isopaque_args isopaque;
    + struct create_args create;
    + struct mkdir_args mkdir;
    + struct mknod_args mknod;
    + struct symlink_args symlink;
    + struct unlink_args unlink;
    + };
    +};
    +
    +extern struct workqueue_struct *sioq;
    +int __init init_sioq(void);
    +extern void fin_sioq(void);
    +extern void run_sioq(void (*func)(void *arg), struct sioq_args *args);
    +
    +/* Extern definitions for our privledge escalation helpers */
    +extern void __unionfs_create(void *data);
    +extern void __unionfs_mkdir(void *data);
    +extern void __unionfs_mknod(void *data);
    +extern void __unionfs_symlink(void *data);
    +extern void __unionfs_unlink(void *data);
    +extern void __delete_whiteouts(void *data);
    +extern void __is_opaque_dir(void *data);
    +
    +#endif /* _SIOQ_H */
    +
    --
    1.4.3.3
    -
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