Commit 745ca247 authored by David Howells's avatar David Howells Committed by James Morris

CRED: Pass credentials through dentry_open()

Pass credentials through dentry_open() so that the COW creds patch can have
SELinux's flush_unauthorized_files() pass the appropriate creds back to itself
when it opens its null chardev.

The security_dentry_open() call also now takes a creds pointer, as does the
dentry_open hook in struct security_operations.
Signed-off-by: default avatarDavid Howells <[email protected]>
Acked-by: default avatarJames Morris <[email protected]>
Signed-off-by: default avatarJames Morris <[email protected]>
parent 88e67f3b
......@@ -323,7 +323,7 @@ static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
goto out;
}
filp = dentry_open(dentry, mnt, O_RDONLY);
filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
if (IS_ERR(filp)) {
put_unused_fd(ret);
ret = PTR_ERR(filp);
......@@ -562,7 +562,7 @@ static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
goto out;
}
filp = dentry_open(dentry, mnt, O_RDONLY);
filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
if (IS_ERR(filp)) {
put_unused_fd(ret);
ret = PTR_ERR(filp);
......
......@@ -159,7 +159,8 @@ void mconsole_proc(struct mc_request *req)
goto out_kill;
}
file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY);
file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY,
current_cred());
if (IS_ERR(file)) {
mconsole_reply(req, "Failed to open file", 1, 0);
goto out_kill;
......
......@@ -307,7 +307,8 @@ static int autofs_dev_ioctl_open_mountpoint(const char *path, dev_t devid)
goto out;
}
filp = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY);
filp = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY,
current_cred());
if (IS_ERR(filp)) {
err = PTR_ERR(filp);
goto out;
......
......@@ -691,7 +691,8 @@ int ecryptfs_init_kthread(void);
void ecryptfs_destroy_kthread(void);
int ecryptfs_privileged_open(struct file **lower_file,
struct dentry *lower_dentry,
struct vfsmount *lower_mnt);
struct vfsmount *lower_mnt,
const struct cred *cred);
int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry);
#endif /* #ifndef ECRYPTFS_KERNEL_H */
......@@ -73,7 +73,7 @@ static int ecryptfs_threadfn(void *ignored)
mntget(req->lower_mnt);
(*req->lower_file) = dentry_open(
req->lower_dentry, req->lower_mnt,
(O_RDWR | O_LARGEFILE));
(O_RDWR | O_LARGEFILE), current_cred());
req->flags |= ECRYPTFS_REQ_PROCESSED;
}
wake_up(&req->wait);
......@@ -132,7 +132,8 @@ void ecryptfs_destroy_kthread(void)
*/
int ecryptfs_privileged_open(struct file **lower_file,
struct dentry *lower_dentry,
struct vfsmount *lower_mnt)
struct vfsmount *lower_mnt,
const struct cred *cred)
{
struct ecryptfs_open_req *req;
int rc = 0;
......@@ -143,7 +144,7 @@ int ecryptfs_privileged_open(struct file **lower_file,
dget(lower_dentry);
mntget(lower_mnt);
(*lower_file) = dentry_open(lower_dentry, lower_mnt,
(O_RDWR | O_LARGEFILE));
(O_RDWR | O_LARGEFILE), cred);
if (!IS_ERR(*lower_file))
goto out;
req = kmem_cache_alloc(ecryptfs_open_req_cache, GFP_KERNEL);
......@@ -184,7 +185,7 @@ int ecryptfs_privileged_open(struct file **lower_file,
dget(lower_dentry);
mntget(lower_mnt);
(*lower_file) = dentry_open(lower_dentry, lower_mnt,
(O_RDONLY | O_LARGEFILE));
(O_RDONLY | O_LARGEFILE), cred);
if (IS_ERR(*lower_file)) {
rc = PTR_ERR(*req->lower_file);
(*lower_file) = NULL;
......
......@@ -115,6 +115,7 @@ void __ecryptfs_printk(const char *fmt, ...)
*/
int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
{
const struct cred *cred = current_cred();
struct ecryptfs_inode_info *inode_info =
ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
int rc = 0;
......@@ -127,7 +128,7 @@ int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
rc = ecryptfs_privileged_open(&inode_info->lower_file,
lower_dentry, lower_mnt);
lower_dentry, lower_mnt, cred);
if (rc || IS_ERR(inode_info->lower_file)) {
printk(KERN_ERR "Error opening lower persistent file "
"for lower_dentry [0x%p] and lower_mnt [0x%p]; "
......
......@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/sched.h>
#define dprintk(fmt, args...) do{}while(0)
......@@ -249,6 +250,7 @@ static int filldir_one(void * __buf, const char * name, int len,
static int get_name(struct vfsmount *mnt, struct dentry *dentry,
char *name, struct dentry *child)
{
const struct cred *cred = current_cred();
struct inode *dir = dentry->d_inode;
int error;
struct file *file;
......@@ -263,7 +265,7 @@ static int get_name(struct vfsmount *mnt, struct dentry *dentry,
/*
* Open the directory ...
*/
file = dentry_open(dget(dentry), mntget(mnt), O_RDONLY);
file = dentry_open(dget(dentry), mntget(mnt), O_RDONLY, cred);
error = PTR_ERR(file);
if (IS_ERR(file))
goto out;
......
......@@ -426,6 +426,7 @@ static int file_mode(int fmode)
static int hppfs_open(struct inode *inode, struct file *file)
{
const struct cred *cred = current_cred();
struct hppfs_private *data;
struct vfsmount *proc_mnt;
struct dentry *proc_dentry;
......@@ -446,7 +447,7 @@ static int hppfs_open(struct inode *inode, struct file *file)
/* XXX This isn't closed anywhere */
data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
file_mode(file->f_mode));
file_mode(file->f_mode), cred);
err = PTR_ERR(data->proc_file);
if (IS_ERR(data->proc_file))
goto out_free1;
......@@ -489,6 +490,7 @@ static int hppfs_open(struct inode *inode, struct file *file)
static int hppfs_dir_open(struct inode *inode, struct file *file)
{
const struct cred *cred = current_cred();
struct hppfs_private *data;
struct vfsmount *proc_mnt;
struct dentry *proc_dentry;
......@@ -502,7 +504,7 @@ static int hppfs_dir_open(struct inode *inode, struct file *file)
proc_dentry = HPPFS_I(inode)->proc_dentry;
proc_mnt = inode->i_sb->s_fs_info;
data->proc_file = dentry_open(dget(proc_dentry), mntget(proc_mnt),
file_mode(file->f_mode));
file_mode(file->f_mode), cred);
err = PTR_ERR(data->proc_file);
if (IS_ERR(data->proc_file))
goto out_free;
......
......@@ -41,7 +41,8 @@ static struct file *do_open(char *name, int flags)
error = may_open(&nd, MAY_WRITE, FMODE_WRITE);
if (!error)
return dentry_open(nd.path.dentry, nd.path.mnt, flags);
return dentry_open(nd.path.dentry, nd.path.mnt, flags,
current_cred());
path_put(&nd.path);
return ERR_PTR(error);
......
......@@ -226,7 +226,8 @@ nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
nfs4_save_user(&uid, &gid);
filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY);
filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY,
current_cred());
status = PTR_ERR(filp);
if (IS_ERR(filp))
goto out;
......
......@@ -671,6 +671,7 @@ __be32
nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
int access, struct file **filp)
{
const struct cred *cred = current_cred();
struct dentry *dentry;
struct inode *inode;
int flags = O_RDONLY|O_LARGEFILE;
......@@ -725,7 +726,7 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
DQUOT_INIT(inode);
}
*filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
flags);
flags, cred);
if (IS_ERR(*filp))
host_err = PTR_ERR(*filp);
out_nfserr:
......
......@@ -783,7 +783,8 @@ static inline int __get_file_write_access(struct inode *inode,
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
int flags, struct file *f,
int (*open)(struct inode *, struct file *))
int (*open)(struct inode *, struct file *),
const struct cred *cred)
{
struct inode *inode;
int error;
......@@ -807,7 +808,7 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
error = security_dentry_open(f);
error = security_dentry_open(f, cred);
if (error)
goto cleanup_all;
......@@ -882,6 +883,8 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
int (*open)(struct inode *, struct file *))
{
const struct cred *cred = current_cred();
if (IS_ERR(nd->intent.open.file))
goto out;
if (IS_ERR(dentry))
......@@ -889,7 +892,7 @@ struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry
nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
nd->intent.open.flags - 1,
nd->intent.open.file,
open);
open, cred);
out:
return nd->intent.open.file;
out_err:
......@@ -908,6 +911,7 @@ EXPORT_SYMBOL_GPL(lookup_instantiate_filp);
*/
struct file *nameidata_to_filp(struct nameidata *nd, int flags)
{
const struct cred *cred = current_cred();
struct file *filp;
/* Pick up the filp from the open intent */
......@@ -915,7 +919,7 @@ struct file *nameidata_to_filp(struct nameidata *nd, int flags)
/* Has the filesystem initialised the file for us? */
if (filp->f_path.dentry == NULL)
filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp,
NULL);
NULL, cred);
else
path_put(&nd->path);
return filp;
......@@ -925,7 +929,8 @@ struct file *nameidata_to_filp(struct nameidata *nd, int flags)
* dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an
* error.
*/
struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
const struct cred *cred)
{
int error;
struct file *f;
......@@ -950,7 +955,7 @@ struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
return ERR_PTR(error);
}
return __dentry_open(dentry, mnt, flags, f, NULL);
return __dentry_open(dentry, mnt, flags, f, NULL, cred);
}
EXPORT_SYMBOL(dentry_open);
......
......@@ -256,6 +256,7 @@ xfs_open_by_handle(
struct file *parfilp,
struct inode *parinode)
{
const struct cred *cred = current_cred();
int error;
int new_fd;
int permflag;
......@@ -321,7 +322,7 @@ xfs_open_by_handle(
mntget(parfilp->f_path.mnt);
/* Create file pointer. */
filp = dentry_open(dentry, parfilp->f_path.mnt, hreq.oflags);
filp = dentry_open(dentry, parfilp->f_path.mnt, hreq.oflags, cred);
if (IS_ERR(filp)) {
put_unused_fd(new_fd);
return -XFS_ERROR(-PTR_ERR(filp));
......
......@@ -315,6 +315,7 @@ struct poll_table_struct;
struct kstatfs;
struct vm_area_struct;
struct vfsmount;
struct cred;
extern void __init inode_init(void);
extern void __init inode_init_early(void);
......@@ -1673,7 +1674,8 @@ extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
extern long do_sys_open(int dfd, const char __user *filename, int flags,
int mode);
extern struct file *filp_open(const char *, int, int);
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
const struct cred *);
extern int filp_close(struct file *, fl_owner_t id);
extern char * getname(const char __user *);
......
......@@ -1402,7 +1402,7 @@ struct security_operations {
int (*file_send_sigiotask) (struct task_struct *tsk,
struct fown_struct *fown, int sig);
int (*file_receive) (struct file *file);
int (*dentry_open) (struct file *file);
int (*dentry_open) (struct file *file, const struct cred *cred);
int (*task_create) (unsigned long clone_flags);
int (*cred_alloc_security) (struct cred *cred);
......@@ -1658,7 +1658,7 @@ int security_file_set_fowner(struct file *file);
int security_file_send_sigiotask(struct task_struct *tsk,
struct fown_struct *fown, int sig);
int security_file_receive(struct file *file);
int security_dentry_open(struct file *file);
int security_dentry_open(struct file *file, const struct cred *cred);
int security_task_create(unsigned long clone_flags);
int security_cred_alloc(struct cred *cred);
void security_cred_free(struct cred *cred);
......@@ -2171,7 +2171,8 @@ static inline int security_file_receive(struct file *file)
return 0;
}
static inline int security_dentry_open(struct file *file)
static inline int security_dentry_open(struct file *file,
const struct cred *cred)
{
return 0;
}
......
......@@ -594,6 +594,7 @@ static int mq_attr_ok(struct mq_attr *attr)
static struct file *do_create(struct dentry *dir, struct dentry *dentry,
int oflag, mode_t mode, struct mq_attr __user *u_attr)
{
const struct cred *cred = current_cred();
struct mq_attr attr;
struct file *result;
int ret;
......@@ -618,7 +619,7 @@ static struct file *do_create(struct dentry *dir, struct dentry *dentry,
if (ret)
goto out_drop_write;
result = dentry_open(dentry, mqueue_mnt, oflag);
result = dentry_open(dentry, mqueue_mnt, oflag, cred);
/*
* dentry_open() took a persistent mnt_want_write(),
* so we can now drop this one.
......@@ -637,8 +638,10 @@ static struct file *do_create(struct dentry *dir, struct dentry *dentry,
/* Opens existing queue */
static struct file *do_open(struct dentry *dentry, int oflag)
{
static int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
MAY_READ | MAY_WRITE };
const struct cred *cred = current_cred();
static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
MAY_READ | MAY_WRITE };
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
dput(dentry);
......@@ -652,7 +655,7 @@ static int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
return ERR_PTR(-EACCES);
}
return dentry_open(dentry, mqueue_mnt, oflag);
return dentry_open(dentry, mqueue_mnt, oflag, cred);
}
asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
......
......@@ -330,7 +330,7 @@ static int cap_file_receive(struct file *file)
return 0;
}
static int cap_dentry_open(struct file *file)
static int cap_dentry_open(struct file *file, const struct cred *cred)
{
return 0;
}
......
......@@ -606,9 +606,9 @@ int security_file_receive(struct file *file)
return security_ops->file_receive(file);
}
int security_dentry_open(struct file *file)
int security_dentry_open(struct file *file, const struct cred *cred)
{
return security_ops->dentry_open(file);
return security_ops->dentry_open(file, cred);
}
int security_task_create(unsigned long clone_flags)
......
......@@ -2150,9 +2150,9 @@ extern struct vfsmount *selinuxfs_mount;
extern struct dentry *selinux_null;
/* Derived from fs/exec.c:flush_old_files. */
static inline void flush_unauthorized_files(struct files_struct *files)
static inline void flush_unauthorized_files(const struct cred *cred,
struct files_struct *files)
{
const struct cred *cred = current_cred();
struct avc_audit_data ad;
struct file *file, *devnull = NULL;
struct tty_struct *tty;
......@@ -2222,7 +2222,10 @@ static inline void flush_unauthorized_files(struct files_struct *files)
if (devnull) {
get_file(devnull);
} else {
devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
devnull = dentry_open(
dget(selinux_null),
mntget(selinuxfs_mount),
O_RDWR, cred);
if (IS_ERR(devnull)) {
devnull = NULL;
put_unused_fd(fd);
......@@ -2302,6 +2305,7 @@ static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
*/
static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
{
const struct cred *cred = current_cred();
struct task_security_struct *tsec;
struct rlimit *rlim, *initrlim;
struct itimerval itimer;
......@@ -2321,7 +2325,7 @@ static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
return;
/* Close files for which the new task SID is not authorized. */
flush_unauthorized_files(current->files);
flush_unauthorized_files(cred, current->files);
/* Check whether the new SID can inherit signal state
from the old SID. If not, clear itimers to avoid
......@@ -3202,9 +3206,8 @@ static int selinux_file_receive(struct file *file)
return file_has_perm(cred, file, file_to_av(file));
}
static int selinux_dentry_open(struct file *file)
static int selinux_dentry_open(struct file *file, const struct cred *cred)
{
const struct cred *cred = current_cred();
struct file_security_struct *fsec;
struct inode *inode;
struct inode_security_struct *isec;
......
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