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authorPatrick McHardy <kaber@trash.net>2013-03-31 18:10:34 +0200
committerPatrick McHardy <kaber@trash.net>2013-03-31 18:10:34 +0200
commit70711d223510ba1773cfe1d7770a56141c815ff8 (patch)
tree4a71f38a3a554ddecaa31b7d8c6bc49b7d1705b4 /fs/debugfs/inode.c
parentd53b4ed072d9779cdf53582c46436dec06d0961f (diff)
parent19f949f52599ba7c3f67a5897ac6be14bfcb1200 (diff)
Merge tag 'v3.8' of /home/kaber/src/repos/linux
Linux 3.8 Signed-off-by: Patrick McHardy <kaber@trash.net> Conflicts: include/linux/Kbuild include/linux/netlink.h
Diffstat (limited to 'fs/debugfs/inode.c')
-rw-r--r--fs/debugfs/inode.c124
1 files changed, 65 insertions, 59 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index b80bc846a15..a5f12b7e228 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -28,7 +28,7 @@
#include <linux/magic.h>
#include <linux/slab.h>
-#define DEBUGFS_DEFAULT_MODE 0755
+#define DEBUGFS_DEFAULT_MODE 0700
static struct vfsmount *debugfs_mount;
static int debugfs_mount_count;
@@ -54,13 +54,11 @@ static struct inode *debugfs_get_inode(struct super_block *sb, umode_t mode, dev
break;
case S_IFLNK:
inode->i_op = &debugfs_link_operations;
- inode->i_fop = fops;
inode->i_private = data;
break;
case S_IFDIR:
inode->i_op = &simple_dir_inode_operations;
- inode->i_fop = fops ? fops : &simple_dir_operations;
- inode->i_private = data;
+ inode->i_fop = &simple_dir_operations;
/* directory inodes start off with i_nlink == 2
* (for "." entry) */
@@ -91,13 +89,12 @@ static int debugfs_mknod(struct inode *dir, struct dentry *dentry,
return error;
}
-static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode,
- void *data, const struct file_operations *fops)
+static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
int res;
mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
- res = debugfs_mknod(dir, dentry, mode, 0, data, fops);
+ res = debugfs_mknod(dir, dentry, mode, 0, NULL, NULL);
if (!res) {
inc_nlink(dir);
fsnotify_mkdir(dir, dentry);
@@ -106,10 +103,10 @@ static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode,
}
static int debugfs_link(struct inode *dir, struct dentry *dentry, umode_t mode,
- void *data, const struct file_operations *fops)
+ void *data)
{
mode = (mode & S_IALLUGO) | S_IFLNK;
- return debugfs_mknod(dir, dentry, mode, 0, data, fops);
+ return debugfs_mknod(dir, dentry, mode, 0, data, NULL);
}
static int debugfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
@@ -130,8 +127,8 @@ static inline int debugfs_positive(struct dentry *dentry)
}
struct debugfs_mount_opts {
- uid_t uid;
- gid_t gid;
+ kuid_t uid;
+ kgid_t gid;
umode_t mode;
};
@@ -158,6 +155,8 @@ static int debugfs_parse_options(char *data, struct debugfs_mount_opts *opts)
substring_t args[MAX_OPT_ARGS];
int option;
int token;
+ kuid_t uid;
+ kgid_t gid;
char *p;
opts->mode = DEBUGFS_DEFAULT_MODE;
@@ -171,12 +170,18 @@ static int debugfs_parse_options(char *data, struct debugfs_mount_opts *opts)
case Opt_uid:
if (match_int(&args[0], &option))
return -EINVAL;
- opts->uid = option;
+ uid = make_kuid(current_user_ns(), option);
+ if (!uid_valid(uid))
+ return -EINVAL;
+ opts->uid = uid;
break;
case Opt_gid:
- if (match_octal(&args[0], &option))
+ if (match_int(&args[0], &option))
return -EINVAL;
- opts->gid = option;
+ gid = make_kgid(current_user_ns(), option);
+ if (!gid_valid(gid))
+ return -EINVAL;
+ opts->gid = gid;
break;
case Opt_mode:
if (match_octal(&args[0], &option))
@@ -228,10 +233,12 @@ static int debugfs_show_options(struct seq_file *m, struct dentry *root)
struct debugfs_fs_info *fsi = root->d_sb->s_fs_info;
struct debugfs_mount_opts *opts = &fsi->mount_opts;
- if (opts->uid != 0)
- seq_printf(m, ",uid=%u", opts->uid);
- if (opts->gid != 0)
- seq_printf(m, ",gid=%u", opts->gid);
+ if (!uid_eq(opts->uid, GLOBAL_ROOT_UID))
+ seq_printf(m, ",uid=%u",
+ from_kuid_munged(&init_user_ns, opts->uid));
+ if (!gid_eq(opts->gid, GLOBAL_ROOT_GID))
+ seq_printf(m, ",gid=%u",
+ from_kgid_munged(&init_user_ns, opts->gid));
if (opts->mode != DEBUGFS_DEFAULT_MODE)
seq_printf(m, ",mode=%o", opts->mode);
@@ -293,13 +300,19 @@ static struct file_system_type debug_fs_type = {
.kill_sb = kill_litter_super,
};
-static int debugfs_create_by_name(const char *name, umode_t mode,
- struct dentry *parent,
- struct dentry **dentry,
- void *data,
- const struct file_operations *fops)
+static struct dentry *__create_file(const char *name, umode_t mode,
+ struct dentry *parent, void *data,
+ const struct file_operations *fops)
{
- int error = 0;
+ struct dentry *dentry = NULL;
+ int error;
+
+ pr_debug("debugfs: creating file '%s'\n",name);
+
+ error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
+ &debugfs_mount_count);
+ if (error)
+ goto exit;
/* If the parent is not specified, we create it in the root.
* We need the root dentry to do this, which is in the super
@@ -309,30 +322,35 @@ static int debugfs_create_by_name(const char *name, umode_t mode,
if (!parent)
parent = debugfs_mount->mnt_root;
- *dentry = NULL;
+ dentry = NULL;
mutex_lock(&parent->d_inode->i_mutex);
- *dentry = lookup_one_len(name, parent, strlen(name));
- if (!IS_ERR(*dentry)) {
+ dentry = lookup_one_len(name, parent, strlen(name));
+ if (!IS_ERR(dentry)) {
switch (mode & S_IFMT) {
case S_IFDIR:
- error = debugfs_mkdir(parent->d_inode, *dentry, mode,
- data, fops);
+ error = debugfs_mkdir(parent->d_inode, dentry, mode);
+
break;
case S_IFLNK:
- error = debugfs_link(parent->d_inode, *dentry, mode,
- data, fops);
+ error = debugfs_link(parent->d_inode, dentry, mode,
+ data);
break;
default:
- error = debugfs_create(parent->d_inode, *dentry, mode,
+ error = debugfs_create(parent->d_inode, dentry, mode,
data, fops);
break;
}
- dput(*dentry);
+ dput(dentry);
} else
- error = PTR_ERR(*dentry);
+ error = PTR_ERR(dentry);
mutex_unlock(&parent->d_inode->i_mutex);
- return error;
+ if (error) {
+ dentry = NULL;
+ simple_release_fs(&debugfs_mount, &debugfs_mount_count);
+ }
+exit:
+ return dentry;
}
/**
@@ -365,25 +383,15 @@ struct dentry *debugfs_create_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops)
{
- struct dentry *dentry = NULL;
- int error;
-
- pr_debug("debugfs: creating file '%s'\n",name);
-
- error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
- &debugfs_mount_count);
- if (error)
- goto exit;
-
- error = debugfs_create_by_name(name, mode, parent, &dentry,
- data, fops);
- if (error) {
- dentry = NULL;
- simple_release_fs(&debugfs_mount, &debugfs_mount_count);
- goto exit;
+ switch (mode & S_IFMT) {
+ case S_IFREG:
+ case 0:
+ break;
+ default:
+ BUG();
}
-exit:
- return dentry;
+
+ return __create_file(name, mode, parent, data, fops);
}
EXPORT_SYMBOL_GPL(debugfs_create_file);
@@ -407,8 +415,7 @@ EXPORT_SYMBOL_GPL(debugfs_create_file);
*/
struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
{
- return debugfs_create_file(name,
- S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
+ return __create_file(name, S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
parent, NULL, NULL);
}
EXPORT_SYMBOL_GPL(debugfs_create_dir);
@@ -446,8 +453,7 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
if (!link)
return NULL;
- result = debugfs_create_file(name, S_IFLNK | S_IRWXUGO, parent, link,
- NULL);
+ result = __create_file(name, S_IFLNK | S_IRWXUGO, parent, link, NULL);
if (!result)
kfree(link);
return result;
@@ -498,7 +504,7 @@ void debugfs_remove(struct dentry *dentry)
struct dentry *parent;
int ret;
- if (!dentry)
+ if (IS_ERR_OR_NULL(dentry))
return;
parent = dentry->d_parent;
@@ -530,7 +536,7 @@ void debugfs_remove_recursive(struct dentry *dentry)
struct dentry *child;
struct dentry *parent;
- if (!dentry)
+ if (IS_ERR_OR_NULL(dentry))
return;
parent = dentry->d_parent;