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Diffstat (limited to 'security/selinux')
-rw-r--r--security/selinux/selinuxfs.c185
1 files changed, 78 insertions, 107 deletions
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index d98fbc4d068f..896acad1f5f7 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -76,7 +76,6 @@ struct selinux_fs_info {
struct dentry *class_dir;
unsigned long last_class_ino;
bool policy_opened;
- struct dentry *policycap_dir;
unsigned long last_ino;
struct super_block *sb;
};
@@ -118,7 +117,6 @@ static void selinux_fs_info_free(struct super_block *sb)
#define BOOL_DIR_NAME "booleans"
#define CLASS_DIR_NAME "class"
-#define POLICYCAP_DIR_NAME "policy_capabilities"
#define TMPBUFLEN 12
static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
@@ -1211,6 +1209,26 @@ static struct inode *sel_make_inode(struct super_block *sb, umode_t mode)
return ret;
}
+static struct dentry *sel_attach(struct dentry *parent, const char *name,
+ struct inode *inode)
+{
+ struct dentry *dentry = d_alloc_name(parent, name);
+ if (unlikely(!dentry)) {
+ iput(inode);
+ return ERR_PTR(-ENOMEM);
+ }
+ d_make_persistent(dentry, inode);
+ dput(dentry);
+ return dentry;
+}
+
+static int sel_attach_file(struct dentry *parent, const char *name,
+ struct inode *inode)
+{
+ struct dentry *dentry = sel_attach(parent, name, inode);
+ return PTR_ERR_OR_ZERO(dentry);
+}
+
static ssize_t sel_read_bool(struct file *filep, char __user *buf,
size_t count, loff_t *ppos)
{
@@ -1370,8 +1388,7 @@ static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_
*bool_num = num;
*bool_pending_names = names;
- for (i = 0; i < num; i++) {
- struct dentry *dentry;
+ for (i = 0; !ret && i < num; i++) {
struct inode *inode;
struct inode_security_struct *isec;
ssize_t len;
@@ -1382,15 +1399,9 @@ static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_
ret = -ENAMETOOLONG;
break;
}
- dentry = d_alloc_name(bool_dir, names[i]);
- if (!dentry) {
- ret = -ENOMEM;
- break;
- }
inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
if (!inode) {
- dput(dentry);
ret = -ENOMEM;
break;
}
@@ -1408,7 +1419,8 @@ static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_
isec->initialized = LABEL_INITIALIZED;
inode->i_fop = &sel_bool_ops;
inode->i_ino = i|SEL_BOOL_INO_OFFSET;
- d_add(dentry, inode);
+
+ ret = sel_attach_file(bool_dir, names[i], inode);
}
out:
free_page((unsigned long)page);
@@ -1593,6 +1605,7 @@ static int sel_make_avc_files(struct dentry *dir)
struct super_block *sb = dir->d_sb;
struct selinux_fs_info *fsi = sb->s_fs_info;
unsigned int i;
+ int err = 0;
static const struct tree_descr files[] = {
{ "cache_threshold",
&sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
@@ -1602,26 +1615,20 @@ static int sel_make_avc_files(struct dentry *dir)
#endif
};
- for (i = 0; i < ARRAY_SIZE(files); i++) {
+ for (i = 0; !err && i < ARRAY_SIZE(files); i++) {
struct inode *inode;
- struct dentry *dentry;
-
- dentry = d_alloc_name(dir, files[i].name);
- if (!dentry)
- return -ENOMEM;
inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
- if (!inode) {
- dput(dentry);
+ if (!inode)
return -ENOMEM;
- }
inode->i_fop = files[i].ops;
inode->i_ino = ++fsi->last_ino;
- d_add(dentry, inode);
+
+ err = sel_attach_file(dir, files[i].name, inode);
}
- return 0;
+ return err;
}
static int sel_make_ss_files(struct dentry *dir)
@@ -1629,30 +1636,25 @@ static int sel_make_ss_files(struct dentry *dir)
struct super_block *sb = dir->d_sb;
struct selinux_fs_info *fsi = sb->s_fs_info;
unsigned int i;
+ int err = 0;
static const struct tree_descr files[] = {
{ "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
};
- for (i = 0; i < ARRAY_SIZE(files); i++) {
+ for (i = 0; !err && i < ARRAY_SIZE(files); i++) {
struct inode *inode;
- struct dentry *dentry;
-
- dentry = d_alloc_name(dir, files[i].name);
- if (!dentry)
- return -ENOMEM;
inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
- if (!inode) {
- dput(dentry);
+ if (!inode)
return -ENOMEM;
- }
inode->i_fop = files[i].ops;
inode->i_ino = ++fsi->last_ino;
- d_add(dentry, inode);
+
+ err = sel_attach_file(dir, files[i].name, inode);
}
- return 0;
+ return err;
}
static ssize_t sel_read_initcon(struct file *file, char __user *buf,
@@ -1680,30 +1682,25 @@ static const struct file_operations sel_initcon_ops = {
static int sel_make_initcon_files(struct dentry *dir)
{
unsigned int i;
+ int err = 0;
- for (i = 1; i <= SECINITSID_NUM; i++) {
- struct inode *inode;
- struct dentry *dentry;
+ for (i = 1; !err && i <= SECINITSID_NUM; i++) {
const char *s = security_get_initial_sid_context(i);
+ struct inode *inode;
if (!s)
continue;
- dentry = d_alloc_name(dir, s);
- if (!dentry)
- return -ENOMEM;
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
- if (!inode) {
- dput(dentry);
+ if (!inode)
return -ENOMEM;
- }
inode->i_fop = &sel_initcon_ops;
inode->i_ino = i|SEL_INITCON_INO_OFFSET;
- d_add(dentry, inode);
+ err = sel_attach_file(dir, s, inode);
}
- return 0;
+ return err;
}
static inline unsigned long sel_class_to_ino(u16 class)
@@ -1785,29 +1782,21 @@ static int sel_make_perm_files(struct selinux_policy *newpolicy,
if (rc)
return rc;
- for (i = 0; i < nperms; i++) {
+ for (i = 0; !rc && i < nperms; i++) {
struct inode *inode;
- struct dentry *dentry;
- rc = -ENOMEM;
- dentry = d_alloc_name(dir, perms[i]);
- if (!dentry)
- goto out;
-
- rc = -ENOMEM;
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
if (!inode) {
- dput(dentry);
- goto out;
+ rc = -ENOMEM;
+ break;
}
inode->i_fop = &sel_perm_ops;
/* i+1 since perm values are 1-indexed */
inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
- d_add(dentry, inode);
+
+ rc = sel_attach_file(dir, perms[i], inode);
}
- rc = 0;
-out:
for (i = 0; i < nperms; i++)
kfree(perms[i]);
kfree(perms);
@@ -1822,20 +1811,18 @@ static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
struct selinux_fs_info *fsi = sb->s_fs_info;
struct dentry *dentry = NULL;
struct inode *inode = NULL;
-
- dentry = d_alloc_name(dir, "index");
- if (!dentry)
- return -ENOMEM;
+ int err;
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
- if (!inode) {
- dput(dentry);
+ if (!inode)
return -ENOMEM;
- }
inode->i_fop = &sel_class_ops;
inode->i_ino = sel_class_to_ino(index);
- d_add(dentry, inode);
+
+ err = sel_attach_file(dir, "index", inode);
+ if (err)
+ return err;
dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
if (IS_ERR(dentry))
@@ -1883,61 +1870,51 @@ out:
return rc;
}
-static int sel_make_policycap(struct selinux_fs_info *fsi)
+static int sel_make_policycap(struct dentry *dir)
{
+ struct super_block *sb = dir->d_sb;
unsigned int iter;
- struct dentry *dentry = NULL;
struct inode *inode = NULL;
+ int err = 0;
+
+ for (iter = 0; !err && iter <= POLICYDB_CAP_MAX; iter++) {
+ const char *name;
- for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) {
if (iter < ARRAY_SIZE(selinux_policycap_names))
- dentry = d_alloc_name(fsi->policycap_dir,
- selinux_policycap_names[iter]);
+ name = selinux_policycap_names[iter];
else
- dentry = d_alloc_name(fsi->policycap_dir, "unknown");
+ name = "unknown";
- if (dentry == NULL)
+ inode = sel_make_inode(sb, S_IFREG | 0444);
+ if (!inode)
return -ENOMEM;
- inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
- if (inode == NULL) {
- dput(dentry);
- return -ENOMEM;
- }
-
inode->i_fop = &sel_policycap_ops;
inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
- d_add(dentry, inode);
+ err = sel_attach_file(dir, name, inode);
}
- return 0;
+ return err;
}
static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
unsigned long *ino)
{
- struct dentry *dentry = d_alloc_name(dir, name);
struct inode *inode;
- if (!dentry)
- return ERR_PTR(-ENOMEM);
-
inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
- if (!inode) {
- dput(dentry);
+ if (!inode)
return ERR_PTR(-ENOMEM);
- }
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
inode->i_ino = ++(*ino);
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inc_nlink(inode);
- d_add(dentry, inode);
/* bump link count on parent directory, too */
inc_nlink(d_inode(dir));
- return dentry;
+ return sel_attach(dir, name, inode);
}
static int reject_all(struct mnt_idmap *idmap, struct inode *inode, int mask)
@@ -1970,10 +1947,11 @@ static struct dentry *sel_make_swapover_dir(struct super_block *sb,
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inc_nlink(inode);
inode_lock(sb->s_root->d_inode);
- d_add(dentry, inode);
+ d_make_persistent(dentry, inode);
inc_nlink(sb->s_root->d_inode);
inode_unlock(sb->s_root->d_inode);
- return dentry;
+ dput(dentry);
+ return dentry; // borrowed
}
#define NULL_FILE_NAME "null"
@@ -2026,16 +2004,9 @@ static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
}
ret = -ENOMEM;
- dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
- if (!dentry)
- goto err;
-
- ret = -ENOMEM;
inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
- if (!inode) {
- dput(dentry);
+ if (!inode)
goto err;
- }
inode->i_ino = ++fsi->last_ino;
isec = selinux_inode(inode);
@@ -2044,7 +2015,9 @@ static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
isec->initialized = LABEL_INITIALIZED;
init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
- d_add(dentry, inode);
+ ret = sel_attach_file(sb->s_root, NULL_FILE_NAME, inode);
+ if (ret)
+ goto err;
dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
if (IS_ERR(dentry)) {
@@ -2083,15 +2056,13 @@ static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
goto err;
}
- fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
- &fsi->last_ino);
- if (IS_ERR(fsi->policycap_dir)) {
- ret = PTR_ERR(fsi->policycap_dir);
- fsi->policycap_dir = NULL;
+ dentry = sel_make_dir(sb->s_root, "policy_capabilities", &fsi->last_ino);
+ if (IS_ERR(dentry)) {
+ ret = PTR_ERR(dentry);
goto err;
}
- ret = sel_make_policycap(fsi);
+ ret = sel_make_policycap(dentry);
if (ret) {
pr_err("SELinux: failed to load policy capabilities\n");
goto err;
@@ -2123,7 +2094,7 @@ static int sel_init_fs_context(struct fs_context *fc)
static void sel_kill_sb(struct super_block *sb)
{
selinux_fs_info_free(sb);
- kill_litter_super(sb);
+ kill_anon_super(sb);
}
static struct file_system_type sel_fs_type = {
generated by cgit (git 2.34.1) at 2025-12-06 06:12:59 +0000