[PATCH 36/59] CRED: Wrap task credential accesses in the NCPFS filesystem

David Howells
2008-08-27T13:53:59Z

Cc: Petr Vandrovec <vandrove@vc.cvut.cz>
Cc: linware@sh.cvut.cz
---

fs/ncpfs/ioctl.c | 91 ++++++++++++++++++++++++++----------------------------
1 files changed, 44 insertions(+), 47 deletions(-)

diff --git a/fs/ncpfs/ioctl.c b/fs/ncpfs/ioctl.c
index 3a97c95..6d04e05 100644
--- a/fs/ncpfs/ioctl.c
+++ b/fs/ncpfs/ioctl.c
@@ -40,10 +40,10 @@ ncp_get_fs_info(struct ncp_server * server, struct file *file,
struct inode *inode = file->f_path.dentry->d_inode;
struct ncp_fs_info info;

- if ((file_permission(file, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(file, MAY_WRITE) != 0
+ && current_uid() != server->m.mounted_uid)
return -EACCES;
- }
+
if (copy_from_user(&info, arg, sizeof(info)))
return -EFAULT;

@@ -70,10 +70,10 @@ ncp_get_fs_info_v2(struct ncp_server * server, struct file *file,
struct inode *inode = file->f_path.dentry->d_inode;
struct ncp_fs_info_v2 info2;

- if ((file_permission(file, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(file, MAY_WRITE) != 0
+ && current_uid() != server->m.mounted_uid)
return -EACCES;
- }
+
if (copy_from_user(&info2, arg, sizeof(info2)))
return -EFAULT;

@@ -141,10 +141,10 @@ ncp_get_compat_fs_info_v2(struct ncp_server * server, struct file *file,
struct inode *inode = file->f_path.dentry->d_inode;
struct compat_ncp_fs_info_v2 info2;

- if ((file_permission(file, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(file, MAY_WRITE) != 0
+ && current_uid() != server->m.mounted_uid)
return -EACCES;
- }
+
if (copy_from_user(&info2, arg, sizeof(info2)))
return -EFAULT;

@@ -270,16 +270,17 @@ static int __ncp_ioctl(struct inode *inode, struct file *filp,
struct ncp_ioctl_request request;
char* bouncebuffer;
void __user *argp = (void __user *)arg;
+ uid_t uid = current_uid();

switch (cmd) {
#ifdef CONFIG_COMPAT
case NCP_IOC_NCPREQUEST_32:
#endif
case NCP_IOC_NCPREQUEST:
- if ((file_permission(filp, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(filp, MAY_WRITE) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
#ifdef CONFIG_COMPAT
if (cmd == NCP_IOC_NCPREQUEST_32) {
struct compat_ncp_ioctl_request request32;
@@ -356,10 +357,10 @@ static int __ncp_ioctl(struct inode *inode, struct file *filp,
case NCP_IOC_GETMOUNTUID16:
case NCP_IOC_GETMOUNTUID32:
case NCP_IOC_GETMOUNTUID64:
- if ((file_permission(filp, MAY_READ) != 0)
- && (current->uid != server->m.mounted_uid)) {
+ if (file_permission(filp, MAY_READ) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
if (cmd == NCP_IOC_GETMOUNTUID16) {
u16 uid;
SET_UID(uid, server->m.mounted_uid);
@@ -380,11 +381,10 @@ static int __ncp_ioctl(struct inode *inode, struct file *filp,
{
struct ncp_setroot_ioctl sr;

- if ((file_permission(filp, MAY_READ) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_READ) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
if (server->m.mounted_vol[0]) {
struct dentry* dentry = inode->i_sb->s_root;

@@ -408,6 +408,7 @@ static int __ncp_ioctl(struct inode *inode, struct file *filp,
return -EFAULT;
return 0;
}
+
case NCP_IOC_SETROOT:
{
struct ncp_setroot_ioctl sr;
@@ -455,11 +456,10 @@ static int __ncp_ioctl(struct inode *inode, struct file *filp,

#ifdef CONFIG_NCPFS_PACKET_SIGNING
case NCP_IOC_SIGN_INIT:
- if ((file_permission(filp, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_WRITE) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
if (argp) {
if (server->sign_wanted)
{
@@ -478,24 +478,22 @@ static int __ncp_ioctl(struct inode *inode, struct file *filp,
return 0;

case NCP_IOC_SIGN_WANTED:
- if ((file_permission(filp, MAY_READ) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_READ) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }

if (put_user(server->sign_wanted, (int __user *)argp))
return -EFAULT;
return 0;
+
case NCP_IOC_SET_SIGN_WANTED:
{
int newstate;

- if ((file_permission(filp, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_WRITE) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
/* get only low 8 bits... */
if (get_user(newstate, (unsigned char __user *)argp))
return -EFAULT;
@@ -512,11 +510,10 @@ static int __ncp_ioctl(struct inode *inode, struct file *filp,

#ifdef CONFIG_NCPFS_IOCTL_LOCKING
case NCP_IOC_LOCKUNLOCK:
- if ((file_permission(filp, MAY_WRITE) != 0)
- && (current->uid != server->m.mounted_uid))
- {
+ if (file_permission(filp, MAY_WRITE) != 0
+ && uid != server->m.mounted_uid)
return -EACCES;
- }
+
{
struct ncp_lock_ioctl rqdata;

@@ -585,9 +582,8 @@ outrel:

#ifdef CONFIG_COMPAT
case NCP_IOC_GETOBJECTNAME_32:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct compat_ncp_objectname_ioctl user;
size_t outl;
@@ -609,10 +605,10 @@ outrel:
return 0;
}
#endif
+
case NCP_IOC_GETOBJECTNAME:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct ncp_objectname_ioctl user;
size_t outl;
@@ -633,13 +629,13 @@ outrel:
return -EFAULT;
return 0;
}
+
#ifdef CONFIG_COMPAT
case NCP_IOC_SETOBJECTNAME_32:
#endif
case NCP_IOC_SETOBJECTNAME:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct ncp_objectname_ioctl user;
void* newname;
@@ -691,13 +687,13 @@ outrel:
kfree(oldname);
return 0;
}
+
#ifdef CONFIG_COMPAT
case NCP_IOC_GETPRIVATEDATA_32:
#endif
case NCP_IOC_GETPRIVATEDATA:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct ncp_privatedata_ioctl user;
size_t outl;
@@ -736,13 +732,13 @@ outrel:

return 0;
}
+
#ifdef CONFIG_COMPAT
case NCP_IOC_SETPRIVATEDATA_32:
#endif
case NCP_IOC_SETPRIVATEDATA:
- if (current->uid != server->m.mounted_uid) {
+ if (uid != server->m.mounted_uid)
return -EACCES;
- }
{
struct ncp_privatedata_ioctl user;
void* new;
@@ -794,9 +790,10 @@ outrel:
#endif /* CONFIG_NCPFS_NLS */

case NCP_IOC_SETDENTRYTTL:
- if ((file_permission(filp, MAY_WRITE) != 0) &&
- (current->uid != server->m.mounted_uid))
+ if (file_permission(filp, MAY_WRITE) != 0 &&
+ uid != server->m.mounted_uid)
return -EACCES;
+
{
u_int32_t user;