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path: root/fs/ncpfs/ioctl.c
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Diffstat (limited to 'fs/ncpfs/ioctl.c')
-rw-r--r--fs/ncpfs/ioctl.c470
1 files changed, 255 insertions, 215 deletions
diff --git a/fs/ncpfs/ioctl.c b/fs/ncpfs/ioctl.c
index 84a8cfc..c2a1f9a 100644
--- a/fs/ncpfs/ioctl.c
+++ b/fs/ncpfs/ioctl.c
@@ -35,16 +35,11 @@
#define NCP_PACKET_SIZE_INTERNAL 65536
static int
-ncp_get_fs_info(struct ncp_server * server, struct file *file,
+ncp_get_fs_info(struct ncp_server * server, struct inode *inode,
struct ncp_fs_info __user *arg)
{
- 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)
- return -EACCES;
-
if (copy_from_user(&info, arg, sizeof(info)))
return -EFAULT;
@@ -65,16 +60,11 @@ ncp_get_fs_info(struct ncp_server * server, struct file *file,
}
static int
-ncp_get_fs_info_v2(struct ncp_server * server, struct file *file,
+ncp_get_fs_info_v2(struct ncp_server * server, struct inode *inode,
struct ncp_fs_info_v2 __user * arg)
{
- 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)
- return -EACCES;
-
if (copy_from_user(&info2, arg, sizeof(info2)))
return -EFAULT;
@@ -136,16 +126,11 @@ struct compat_ncp_privatedata_ioctl
#define NCP_IOC_SETPRIVATEDATA_32 _IOR('n', 10, struct compat_ncp_privatedata_ioctl)
static int
-ncp_get_compat_fs_info_v2(struct ncp_server * server, struct file *file,
+ncp_get_compat_fs_info_v2(struct ncp_server * server, struct inode *inode,
struct compat_ncp_fs_info_v2 __user * arg)
{
- 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)
- return -EACCES;
-
if (copy_from_user(&info2, arg, sizeof(info2)))
return -EFAULT;
@@ -182,11 +167,8 @@ ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
struct nls_table *iocharset;
struct nls_table *oldset_io;
struct nls_table *oldset_cp;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- if (server->root_setuped)
- return -EBUSY;
+ int utf8;
+ int err;
if (copy_from_user(&user, arg, sizeof(user)))
return -EFAULT;
@@ -206,28 +188,40 @@ ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
user.iocharset[NCP_IOCSNAME_LEN] = 0;
if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
iocharset = load_nls_default();
- NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
+ utf8 = 0;
} else if (!strcmp(user.iocharset, "utf8")) {
iocharset = load_nls_default();
- NCP_SET_FLAG(server, NCP_FLAG_UTF8);
+ utf8 = 1;
} else {
iocharset = load_nls(user.iocharset);
if (!iocharset) {
unload_nls(codepage);
return -EBADRQC;
}
- NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
+ utf8 = 0;
}
- oldset_cp = server->nls_vol;
- server->nls_vol = codepage;
- oldset_io = server->nls_io;
- server->nls_io = iocharset;
-
+ mutex_lock(&server->root_setup_lock);
+ if (server->root_setuped) {
+ oldset_cp = codepage;
+ oldset_io = iocharset;
+ err = -EBUSY;
+ } else {
+ if (utf8)
+ NCP_SET_FLAG(server, NCP_FLAG_UTF8);
+ else
+ NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
+ oldset_cp = server->nls_vol;
+ server->nls_vol = codepage;
+ oldset_io = server->nls_io;
+ server->nls_io = iocharset;
+ err = 0;
+ }
+ mutex_unlock(&server->root_setup_lock);
unload_nls(oldset_cp);
unload_nls(oldset_io);
- return 0;
+ return err;
}
static int
@@ -237,6 +231,7 @@ ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
int len;
memset(&user, 0, sizeof(user));
+ mutex_lock(&server->root_setup_lock);
if (server->nls_vol && server->nls_vol->charset) {
len = strlen(server->nls_vol->charset);
if (len > NCP_IOCSNAME_LEN)
@@ -254,6 +249,7 @@ ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
strncpy(user.iocharset, server->nls_io->charset, len);
user.iocharset[len] = 0;
}
+ mutex_unlock(&server->root_setup_lock);
if (copy_to_user(arg, &user, sizeof(user)))
return -EFAULT;
@@ -261,25 +257,19 @@ ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
}
#endif /* CONFIG_NCPFS_NLS */
-static long __ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+static long __ncp_ioctl(struct inode *inode, unsigned int cmd, unsigned long arg)
{
- struct inode *inode = filp->f_dentry->d_inode;
struct ncp_server *server = NCP_SERVER(inode);
int result;
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
- && uid != server->m.mounted_uid)
- return -EACCES;
-
#ifdef CONFIG_COMPAT
if (cmd == NCP_IOC_NCPREQUEST_32) {
struct compat_ncp_ioctl_request request32;
@@ -314,7 +304,7 @@ static long __ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
server->current_size = request.size;
memcpy(server->packet, bouncebuffer, request.size);
- result = ncp_request2(server, request.function,
+ result = ncp_request2(server, request.function,
bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
if (result < 0)
result = -EIO;
@@ -331,69 +321,69 @@ static long __ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case NCP_IOC_CONN_LOGGED_IN:
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
return -EINVAL;
+ mutex_lock(&server->root_setup_lock);
if (server->root_setuped)
- return -EBUSY;
- server->root_setuped = 1;
- return ncp_conn_logged_in(inode->i_sb);
+ result = -EBUSY;
+ else {
+ result = ncp_conn_logged_in(inode->i_sb);
+ if (result == 0)
+ server->root_setuped = 1;
+ }
+ mutex_unlock(&server->root_setup_lock);
+ return result;
case NCP_IOC_GET_FS_INFO:
- return ncp_get_fs_info(server, filp, argp);
+ return ncp_get_fs_info(server, inode, argp);
case NCP_IOC_GET_FS_INFO_V2:
- return ncp_get_fs_info_v2(server, filp, argp);
+ return ncp_get_fs_info_v2(server, inode, argp);
#ifdef CONFIG_COMPAT
case NCP_IOC_GET_FS_INFO_V2_32:
- return ncp_get_compat_fs_info_v2(server, filp, argp);
+ return ncp_get_compat_fs_info_v2(server, inode, argp);
#endif
/* we have too many combinations of CONFIG_COMPAT,
* CONFIG_64BIT and CONFIG_UID16, so just handle
* any of the possible ioctls */
case NCP_IOC_GETMOUNTUID16:
- case NCP_IOC_GETMOUNTUID32:
- case NCP_IOC_GETMOUNTUID64:
- 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);
if (put_user(uid, (u16 __user *)argp))
return -EFAULT;
- } else if (cmd == NCP_IOC_GETMOUNTUID32) {
- if (put_user(server->m.mounted_uid,
- (u32 __user *)argp))
- return -EFAULT;
- } else {
- if (put_user(server->m.mounted_uid,
- (u64 __user *)argp))
- return -EFAULT;
+ return 0;
}
+ case NCP_IOC_GETMOUNTUID32:
+ if (put_user(server->m.mounted_uid,
+ (u32 __user *)argp))
+ return -EFAULT;
+ return 0;
+ case NCP_IOC_GETMOUNTUID64:
+ if (put_user(server->m.mounted_uid,
+ (u64 __user *)argp))
+ return -EFAULT;
return 0;
case NCP_IOC_GETROOT:
{
struct ncp_setroot_ioctl sr;
- if (file_permission(filp, MAY_READ) != 0
- && uid != server->m.mounted_uid)
- return -EACCES;
-
+ result = -EACCES;
+ mutex_lock(&server->root_setup_lock);
if (server->m.mounted_vol[0]) {
struct dentry* dentry = inode->i_sb->s_root;
if (dentry) {
struct inode* s_inode = dentry->d_inode;
-
+
if (s_inode) {
sr.volNumber = NCP_FINFO(s_inode)->volNumber;
sr.dirEntNum = NCP_FINFO(s_inode)->dirEntNum;
sr.namespace = server->name_space[sr.volNumber];
+ result = 0;
} else
DPRINTK("ncpfs: s_root->d_inode==NULL\n");
} else
@@ -402,10 +392,12 @@ static long __ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
sr.volNumber = -1;
sr.namespace = 0;
sr.dirEntNum = 0;
+ result = 0;
}
- if (copy_to_user(argp, &sr, sizeof(sr)))
- return -EFAULT;
- return 0;
+ mutex_unlock(&server->root_setup_lock);
+ if (!result && copy_to_user(argp, &sr, sizeof(sr)))
+ result = -EFAULT;
+ return result;
}
case NCP_IOC_SETROOT:
@@ -416,103 +408,114 @@ static long __ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
__le32 dosde;
struct dentry* dentry;
- if (!capable(CAP_SYS_ADMIN))
- {
- return -EACCES;
- }
- if (server->root_setuped) return -EBUSY;
if (copy_from_user(&sr, argp, sizeof(sr)))
return -EFAULT;
- if (sr.volNumber < 0) {
- server->m.mounted_vol[0] = 0;
- vnum = NCP_NUMBER_OF_VOLUMES;
- de = 0;
- dosde = 0;
- } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
- return -EINVAL;
- } else if (ncp_mount_subdir(server, sr.volNumber,
- sr.namespace, sr.dirEntNum,
- &vnum, &de, &dosde)) {
- return -ENOENT;
- }
-
- dentry = inode->i_sb->s_root;
- server->root_setuped = 1;
- if (dentry) {
- struct inode* s_inode = dentry->d_inode;
-
- if (s_inode) {
- NCP_FINFO(s_inode)->volNumber = vnum;
- NCP_FINFO(s_inode)->dirEntNum = de;
- NCP_FINFO(s_inode)->DosDirNum = dosde;
+ mutex_lock(&server->root_setup_lock);
+ if (server->root_setuped)
+ result = -EBUSY;
+ else {
+ if (sr.volNumber < 0) {
+ server->m.mounted_vol[0] = 0;
+ vnum = NCP_NUMBER_OF_VOLUMES;
+ de = 0;
+ dosde = 0;
+ result = 0;
+ } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
+ result = -EINVAL;
+ } else if (ncp_mount_subdir(server, sr.volNumber,
+ sr.namespace, sr.dirEntNum,
+ &vnum, &de, &dosde)) {
+ result = -ENOENT;
} else
- DPRINTK("ncpfs: s_root->d_inode==NULL\n");
- } else
- DPRINTK("ncpfs: s_root==NULL\n");
+ result = 0;
+
+ if (result == 0) {
+ dentry = inode->i_sb->s_root;
+ if (dentry) {
+ struct inode* s_inode = dentry->d_inode;
+
+ if (s_inode) {
+ NCP_FINFO(s_inode)->volNumber = vnum;
+ NCP_FINFO(s_inode)->dirEntNum = de;
+ NCP_FINFO(s_inode)->DosDirNum = dosde;
+ server->root_setuped = 1;
+ } else {
+ DPRINTK("ncpfs: s_root->d_inode==NULL\n");
+ result = -EIO;
+ }
+ } else {
+ DPRINTK("ncpfs: s_root==NULL\n");
+ result = -EIO;
+ }
+ }
+ result = 0;
+ }
+ mutex_unlock(&server->root_setup_lock);
- return 0;
+ return result;
}
-#ifdef CONFIG_NCPFS_PACKET_SIGNING
+#ifdef CONFIG_NCPFS_PACKET_SIGNING
case NCP_IOC_SIGN_INIT:
- if (file_permission(filp, MAY_WRITE) != 0
- && uid != server->m.mounted_uid)
- return -EACCES;
-
- if (argp) {
- if (server->sign_wanted)
- {
- struct ncp_sign_init sign;
+ {
+ struct ncp_sign_init sign;
+ if (argp)
if (copy_from_user(&sign, argp, sizeof(sign)))
return -EFAULT;
- memcpy(server->sign_root,sign.sign_root,8);
- memcpy(server->sign_last,sign.sign_last,16);
- server->sign_active = 1;
+ ncp_lock_server(server);
+ mutex_lock(&server->rcv.creq_mutex);
+ if (argp) {
+ if (server->sign_wanted) {
+ memcpy(server->sign_root,sign.sign_root,8);
+ memcpy(server->sign_last,sign.sign_last,16);
+ server->sign_active = 1;
+ }
+ /* ignore when signatures not wanted */
+ } else {
+ server->sign_active = 0;
}
- /* ignore when signatures not wanted */
- } else {
- server->sign_active = 0;
+ mutex_unlock(&server->rcv.creq_mutex);
+ ncp_unlock_server(server);
+ return 0;
}
- return 0;
-
+
case NCP_IOC_SIGN_WANTED:
- 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;
+ {
+ int state;
+
+ ncp_lock_server(server);
+ state = server->sign_wanted;
+ ncp_unlock_server(server);
+ if (put_user(state, (int __user *)argp))
+ return -EFAULT;
+ return 0;
+ }
case NCP_IOC_SET_SIGN_WANTED:
{
int newstate;
- 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;
+ result = 0;
+ ncp_lock_server(server);
if (server->sign_active) {
/* cannot turn signatures OFF when active */
- if (!newstate) return -EINVAL;
+ if (!newstate)
+ result = -EINVAL;
} else {
server->sign_wanted = newstate != 0;
}
- return 0;
+ ncp_unlock_server(server);
+ return result;
}
#endif /* CONFIG_NCPFS_PACKET_SIGNING */
#ifdef CONFIG_NCPFS_IOCTL_LOCKING
case NCP_IOC_LOCKUNLOCK:
- if (file_permission(filp, MAY_WRITE) != 0
- && uid != server->m.mounted_uid)
- return -EACCES;
-
{
struct ncp_lock_ioctl rqdata;
@@ -541,16 +544,13 @@ static long __ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
return result;
}
- result = -EIO;
- if (!ncp_conn_valid(server))
- goto outrel;
result = -EISDIR;
if (!S_ISREG(inode->i_mode))
goto outrel;
if (rqdata.cmd == NCP_LOCK_CLEAR)
{
result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
- NCP_FINFO(inode)->file_handle,
+ NCP_FINFO(inode)->file_handle,
rqdata.offset,
rqdata.length);
if (result > 0) result = 0; /* no such lock */
@@ -573,7 +573,7 @@ static long __ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
rqdata.timeout);
if (result > 0) result = -EAGAIN;
}
-outrel:
+outrel:
ncp_inode_close(inode);
return result;
}
@@ -581,60 +581,62 @@ outrel:
#ifdef CONFIG_COMPAT
case NCP_IOC_GETOBJECTNAME_32:
- if (uid != server->m.mounted_uid)
- return -EACCES;
{
struct compat_ncp_objectname_ioctl user;
size_t outl;
if (copy_from_user(&user, argp, sizeof(user)))
return -EFAULT;
+ down_read(&server->auth_rwsem);
user.auth_type = server->auth.auth_type;
outl = user.object_name_len;
user.object_name_len = server->auth.object_name_len;
if (outl > user.object_name_len)
outl = user.object_name_len;
+ result = 0;
if (outl) {
if (copy_to_user(compat_ptr(user.object_name),
server->auth.object_name,
- outl)) return -EFAULT;
+ outl))
+ result = -EFAULT;
}
- if (copy_to_user(argp, &user, sizeof(user)))
- return -EFAULT;
- return 0;
+ up_read(&server->auth_rwsem);
+ if (!result && copy_to_user(argp, &user, sizeof(user)))
+ result = -EFAULT;
+ return result;
}
#endif
case NCP_IOC_GETOBJECTNAME:
- if (uid != server->m.mounted_uid)
- return -EACCES;
{
struct ncp_objectname_ioctl user;
size_t outl;
if (copy_from_user(&user, argp, sizeof(user)))
return -EFAULT;
+ down_read(&server->auth_rwsem);
user.auth_type = server->auth.auth_type;
outl = user.object_name_len;
user.object_name_len = server->auth.object_name_len;
if (outl > user.object_name_len)
outl = user.object_name_len;
+ result = 0;
if (outl) {
if (copy_to_user(user.object_name,
server->auth.object_name,
- outl)) return -EFAULT;
+ outl))
+ result = -EFAULT;
}
- if (copy_to_user(argp, &user, sizeof(user)))
- return -EFAULT;
- return 0;
+ up_read(&server->auth_rwsem);
+ if (!result && copy_to_user(argp, &user, sizeof(user)))
+ result = -EFAULT;
+ return result;
}
#ifdef CONFIG_COMPAT
case NCP_IOC_SETOBJECTNAME_32:
#endif
case NCP_IOC_SETOBJECTNAME:
- if (uid != server->m.mounted_uid)
- return -EACCES;
{
struct ncp_objectname_ioctl user;
void* newname;
@@ -666,9 +668,7 @@ outrel:
} else {
newname = NULL;
}
- /* enter critical section */
- /* maybe that kfree can sleep so do that this way */
- /* it is at least more SMP friendly (in future...) */
+ down_write(&server->auth_rwsem);
oldname = server->auth.object_name;
oldnamelen = server->auth.object_name_len;
oldprivate = server->priv.data;
@@ -678,7 +678,7 @@ outrel:
server->auth.object_name = newname;
server->priv.len = 0;
server->priv.data = NULL;
- /* leave critical section */
+ up_write(&server->auth_rwsem);
kfree(oldprivate);
kfree(oldname);
return 0;
@@ -688,8 +688,6 @@ outrel:
case NCP_IOC_GETPRIVATEDATA_32:
#endif
case NCP_IOC_GETPRIVATEDATA:
- if (uid != server->m.mounted_uid)
- return -EACCES;
{
struct ncp_privatedata_ioctl user;
size_t outl;
@@ -706,14 +704,20 @@ outrel:
if (copy_from_user(&user, argp, sizeof(user)))
return -EFAULT;
+ down_read(&server->auth_rwsem);
outl = user.len;
user.len = server->priv.len;
if (outl > user.len) outl = user.len;
+ result = 0;
if (outl) {
if (copy_to_user(user.data,
server->priv.data,
- outl)) return -EFAULT;
+ outl))
+ result = -EFAULT;
}
+ up_read(&server->auth_rwsem);
+ if (result)
+ return result;
#ifdef CONFIG_COMPAT
if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
struct compat_ncp_privatedata_ioctl user32;
@@ -733,8 +737,6 @@ outrel:
case NCP_IOC_SETPRIVATEDATA_32:
#endif
case NCP_IOC_SETPRIVATEDATA:
- if (uid != server->m.mounted_uid)
- return -EACCES;
{
struct ncp_privatedata_ioctl user;
void* new;
@@ -762,12 +764,12 @@ outrel:
} else {
new = NULL;
}
- /* enter critical section */
+ down_write(&server->auth_rwsem);
old = server->priv.data;
oldlen = server->priv.len;
server->priv.len = user.len;
server->priv.data = new;
- /* leave critical section */
+ up_write(&server->auth_rwsem);
kfree(old);
return 0;
}
@@ -775,17 +777,13 @@ outrel:
#ifdef CONFIG_NCPFS_NLS
case NCP_IOC_SETCHARSETS:
return ncp_set_charsets(server, argp);
-
+
case NCP_IOC_GETCHARSETS:
return ncp_get_charsets(server, argp);
#endif /* CONFIG_NCPFS_NLS */
case NCP_IOC_SETDENTRYTTL:
- if (file_permission(filp, MAY_WRITE) != 0 &&
- uid != server->m.mounted_uid)
- return -EACCES;
-
{
u_int32_t user;
@@ -795,13 +793,13 @@ outrel:
if (user > 20000)
return -EINVAL;
user = (user * HZ) / 1000;
- server->dentry_ttl = user;
+ atomic_set(&server->dentry_ttl, user);
return 0;
}
-
+
case NCP_IOC_GETDENTRYTTL:
{
- u_int32_t user = (server->dentry_ttl * 1000) / HZ;
+ u_int32_t user = (atomic_read(&server->dentry_ttl) * 1000) / HZ;
if (copy_to_user(argp, &user, sizeof(user)))
return -EFAULT;
return 0;
@@ -811,59 +809,103 @@ outrel:
return -EINVAL;
}
-static int ncp_ioctl_need_write(unsigned int cmd)
+long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
+ struct inode *inode = filp->f_dentry->d_inode;
+ struct ncp_server *server = NCP_SERVER(inode);
+ uid_t uid = current_uid();
+ int need_drop_write = 0;
+ long ret;
+
switch (cmd) {
- case NCP_IOC_GET_FS_INFO:
- case NCP_IOC_GET_FS_INFO_V2:
- case NCP_IOC_NCPREQUEST:
- case NCP_IOC_SETDENTRYTTL:
- case NCP_IOC_SIGN_INIT:
- case NCP_IOC_LOCKUNLOCK:
- case NCP_IOC_SET_SIGN_WANTED:
- return 1;
- case NCP_IOC_GETOBJECTNAME:
- case NCP_IOC_SETOBJECTNAME:
- case NCP_IOC_GETPRIVATEDATA:
- case NCP_IOC_SETPRIVATEDATA:
case NCP_IOC_SETCHARSETS:
- case NCP_IOC_GETCHARSETS:
case NCP_IOC_CONN_LOGGED_IN:
- case NCP_IOC_GETDENTRYTTL:
- case NCP_IOC_GETMOUNTUID2:
- case NCP_IOC_SIGN_WANTED:
- case NCP_IOC_GETROOT:
case NCP_IOC_SETROOT:
- return 0;
- default:
- /* unknown IOCTL command, assume write */
- return 1;
+ if (!capable(CAP_SYS_ADMIN)) {
+ ret = -EACCES;
+ goto out;
+ }
+ break;
}
-}
-
-long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
- long ret;
-
- lock_kernel();
- if (ncp_ioctl_need_write(cmd)) {
+ if (server->m.mounted_uid != uid) {
+ switch (cmd) {
/*
- * inside the ioctl(), any failures which
- * are because of file_permission() are
- * -EACCESS, so it seems consistent to keep
- * that here.
+ * Only mount owner can issue these ioctls. Information
+ * necessary to authenticate to other NDS servers are
+ * stored here.
*/
- if (mnt_want_write(filp->f_path.mnt)) {
+ case NCP_IOC_GETOBJECTNAME:
+ case NCP_IOC_SETOBJECTNAME:
+ case NCP_IOC_GETPRIVATEDATA:
+ case NCP_IOC_SETPRIVATEDATA:
+#ifdef CONFIG_COMPAT
+ case NCP_IOC_GETOBJECTNAME_32:
+ case NCP_IOC_SETOBJECTNAME_32:
+ case NCP_IOC_GETPRIVATEDATA_32:
+ case NCP_IOC_SETPRIVATEDATA_32:
+#endif
ret = -EACCES;
goto out;
+ /*
+ * These require write access on the inode if user id
+ * does not match. Note that they do not write to the
+ * file... But old code did mnt_want_write, so I keep
+ * it as is. Of course not for mountpoint owner, as
+ * that breaks read-only mounts altogether as ncpmount
+ * needs working NCP_IOC_NCPREQUEST and
+ * NCP_IOC_GET_FS_INFO. Some of these codes (setdentryttl,
+ * signinit, setsignwanted) should be probably restricted
+ * to owner only, or even more to CAP_SYS_ADMIN).
+ */
+ case NCP_IOC_GET_FS_INFO:
+ case NCP_IOC_GET_FS_INFO_V2:
+ case NCP_IOC_NCPREQUEST:
+ case NCP_IOC_SETDENTRYTTL:
+ case NCP_IOC_SIGN_INIT:
+ case NCP_IOC_LOCKUNLOCK:
+ case NCP_IOC_SET_SIGN_WANTED:
+#ifdef CONFIG_COMPAT
+ case NCP_IOC_GET_FS_INFO_V2_32:
+ case NCP_IOC_NCPREQUEST_32:
+#endif
+ ret = mnt_want_write_file(filp);
+ if (ret)
+ goto out;
+ need_drop_write = 1;
+ ret = inode_permission(inode, MAY_WRITE);
+ if (ret)
+ goto outDropWrite;
+ break;
+ /*
+ * Read access required.
+ */
+ case NCP_IOC_GETMOUNTUID16:
+ case NCP_IOC_GETMOUNTUID32:
+ case NCP_IOC_GETMOUNTUID64:
+ case NCP_IOC_GETROOT:
+ case NCP_IOC_SIGN_WANTED:
+ ret = inode_permission(inode, MAY_READ);
+ if (ret)
+ goto out;
+ break;
+ /*
+ * Anybody can read these.
+ */
+ case NCP_IOC_GETCHARSETS:
+ case NCP_IOC_GETDENTRYTTL:
+ default:
+ /* Three codes below are protected by CAP_SYS_ADMIN above. */
+ case NCP_IOC_SETCHARSETS:
+ case NCP_IOC_CONN_LOGGED_IN:
+ case NCP_IOC_SETROOT:
+ break;
}
}
- ret = __ncp_ioctl(filp, cmd, arg);
- if (ncp_ioctl_need_write(cmd))
+ ret = __ncp_ioctl(inode, cmd, arg);
+outDropWrite:
+ if (need_drop_write)
mnt_drop_write(filp->f_path.mnt);
-
out:
- unlock_kernel();
return ret;
}
@@ -872,10 +914,8 @@ long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
- lock_kernel();
arg = (unsigned long) compat_ptr(arg);
ret = ncp_ioctl(file, cmd, arg);
- unlock_kernel();
return ret;
}
#endif
generated by cgit v0.10.2 at 2024-11-04 18:53:11 (GMT)