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-rw-r--r--security/selinux/hooks.c178
1 files changed, 60 insertions, 118 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 8641f8894b4c..f40c8221ec1b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1265,85 +1265,6 @@ static int inode_security_set_sid(struct inode *inode, u32 sid)
return 0;
}
-/* Set the security attributes on a newly created file. */
-static int post_create(struct inode *dir,
- struct dentry *dentry)
-{
-
- struct task_security_struct *tsec;
- struct inode *inode;
- struct inode_security_struct *dsec;
- struct superblock_security_struct *sbsec;
- u32 newsid;
- char *context;
- unsigned int len;
- int rc;
-
- tsec = current->security;
- dsec = dir->i_security;
- sbsec = dir->i_sb->s_security;
-
- inode = dentry->d_inode;
- if (!inode) {
- /* Some file system types (e.g. NFS) may not instantiate
- a dentry for all create operations (e.g. symlink),
- so we have to check to see if the inode is non-NULL. */
- printk(KERN_WARNING "post_create: no inode, dir (dev=%s, "
- "ino=%ld)\n", dir->i_sb->s_id, dir->i_ino);
- return 0;
- }
-
- if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
- newsid = tsec->create_sid;
- } else {
- rc = security_transition_sid(tsec->sid, dsec->sid,
- inode_mode_to_security_class(inode->i_mode),
- &newsid);
- if (rc) {
- printk(KERN_WARNING "post_create: "
- "security_transition_sid failed, rc=%d (dev=%s "
- "ino=%ld)\n",
- -rc, inode->i_sb->s_id, inode->i_ino);
- return rc;
- }
- }
-
- rc = inode_security_set_sid(inode, newsid);
- if (rc) {
- printk(KERN_WARNING "post_create: inode_security_set_sid "
- "failed, rc=%d (dev=%s ino=%ld)\n",
- -rc, inode->i_sb->s_id, inode->i_ino);
- return rc;
- }
-
- if (sbsec->behavior == SECURITY_FS_USE_XATTR &&
- inode->i_op->setxattr) {
- /* Use extended attributes. */
- rc = security_sid_to_context(newsid, &context, &len);
- if (rc) {
- printk(KERN_WARNING "post_create: sid_to_context "
- "failed, rc=%d (dev=%s ino=%ld)\n",
- -rc, inode->i_sb->s_id, inode->i_ino);
- return rc;
- }
- down(&inode->i_sem);
- rc = inode->i_op->setxattr(dentry,
- XATTR_NAME_SELINUX,
- context, len, 0);
- up(&inode->i_sem);
- kfree(context);
- if (rc < 0) {
- printk(KERN_WARNING "post_create: setxattr failed, "
- "rc=%d (dev=%s ino=%ld)\n",
- -rc, inode->i_sb->s_id, inode->i_ino);
- return rc;
- }
- }
-
- return 0;
-}
-
-
/* Hook functions begin here. */
static int selinux_ptrace(struct task_struct *parent, struct task_struct *child)
@@ -1673,6 +1594,7 @@ static inline void flush_unauthorized_files(struct files_struct * files)
struct avc_audit_data ad;
struct file *file, *devnull = NULL;
struct tty_struct *tty = current->signal->tty;
+ struct fdtable *fdt;
long j = -1;
if (tty) {
@@ -1706,9 +1628,10 @@ static inline void flush_unauthorized_files(struct files_struct * files)
j++;
i = j * __NFDBITS;
- if (i >= files->max_fds || i >= files->max_fdset)
+ fdt = files_fdtable(files);
+ if (i >= fdt->max_fds || i >= fdt->max_fdset)
break;
- set = files->open_fds->fds_bits[j];
+ set = fdt->open_fds->fds_bits[j];
if (!set)
continue;
spin_unlock(&files->file_lock);
@@ -1729,7 +1652,7 @@ static inline void flush_unauthorized_files(struct files_struct * files)
continue;
}
if (devnull) {
- atomic_inc(&devnull->f_count);
+ rcuref_inc(&devnull->f_count);
} else {
devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
if (!devnull) {
@@ -2018,14 +1941,64 @@ static void selinux_inode_free_security(struct inode *inode)
inode_free_security(inode);
}
-static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
+static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
+ char **name, void **value,
+ size_t *len)
{
- return may_create(dir, dentry, SECCLASS_FILE);
+ struct task_security_struct *tsec;
+ struct inode_security_struct *dsec;
+ struct superblock_security_struct *sbsec;
+ struct inode_security_struct *isec;
+ u32 newsid, clen;
+ int rc;
+ char *namep = NULL, *context;
+
+ tsec = current->security;
+ dsec = dir->i_security;
+ sbsec = dir->i_sb->s_security;
+ isec = inode->i_security;
+
+ if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
+ newsid = tsec->create_sid;
+ } else {
+ rc = security_transition_sid(tsec->sid, dsec->sid,
+ inode_mode_to_security_class(inode->i_mode),
+ &newsid);
+ if (rc) {
+ printk(KERN_WARNING "%s: "
+ "security_transition_sid failed, rc=%d (dev=%s "
+ "ino=%ld)\n",
+ __FUNCTION__,
+ -rc, inode->i_sb->s_id, inode->i_ino);
+ return rc;
+ }
+ }
+
+ inode_security_set_sid(inode, newsid);
+
+ if (name) {
+ namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL);
+ if (!namep)
+ return -ENOMEM;
+ *name = namep;
+ }
+
+ if (value && len) {
+ rc = security_sid_to_context(newsid, &context, &clen);
+ if (rc) {
+ kfree(namep);
+ return rc;
+ }
+ *value = context;
+ *len = clen;
+ }
+
+ return 0;
}
-static void selinux_inode_post_create(struct inode *dir, struct dentry *dentry, int mask)
+static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
{
- post_create(dir, dentry);
+ return may_create(dir, dentry, SECCLASS_FILE);
}
static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
@@ -2038,11 +2011,6 @@ static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, stru
return may_link(dir, old_dentry, MAY_LINK);
}
-static void selinux_inode_post_link(struct dentry *old_dentry, struct inode *inode, struct dentry *new_dentry)
-{
- return;
-}
-
static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
{
int rc;
@@ -2058,21 +2026,11 @@ static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const
return may_create(dir, dentry, SECCLASS_LNK_FILE);
}
-static void selinux_inode_post_symlink(struct inode *dir, struct dentry *dentry, const char *name)
-{
- post_create(dir, dentry);
-}
-
static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
{
return may_create(dir, dentry, SECCLASS_DIR);
}
-static void selinux_inode_post_mkdir(struct inode *dir, struct dentry *dentry, int mask)
-{
- post_create(dir, dentry);
-}
-
static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
{
return may_link(dir, dentry, MAY_RMDIR);
@@ -2089,23 +2047,12 @@ static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mod
return may_create(dir, dentry, inode_mode_to_security_class(mode));
}
-static void selinux_inode_post_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
-{
- post_create(dir, dentry);
-}
-
static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
struct inode *new_inode, struct dentry *new_dentry)
{
return may_rename(old_inode, old_dentry, new_inode, new_dentry);
}
-static void selinux_inode_post_rename(struct inode *old_inode, struct dentry *old_dentry,
- struct inode *new_inode, struct dentry *new_dentry)
-{
- return;
-}
-
static int selinux_inode_readlink(struct dentry *dentry)
{
return dentry_has_perm(current, NULL, dentry, FILE__READ);
@@ -4298,20 +4245,15 @@ static struct security_operations selinux_ops = {
.inode_alloc_security = selinux_inode_alloc_security,
.inode_free_security = selinux_inode_free_security,
+ .inode_init_security = selinux_inode_init_security,
.inode_create = selinux_inode_create,
- .inode_post_create = selinux_inode_post_create,
.inode_link = selinux_inode_link,
- .inode_post_link = selinux_inode_post_link,
.inode_unlink = selinux_inode_unlink,
.inode_symlink = selinux_inode_symlink,
- .inode_post_symlink = selinux_inode_post_symlink,
.inode_mkdir = selinux_inode_mkdir,
- .inode_post_mkdir = selinux_inode_post_mkdir,
.inode_rmdir = selinux_inode_rmdir,
.inode_mknod = selinux_inode_mknod,
- .inode_post_mknod = selinux_inode_post_mknod,
.inode_rename = selinux_inode_rename,
- .inode_post_rename = selinux_inode_post_rename,
.inode_readlink = selinux_inode_readlink,
.inode_follow_link = selinux_inode_follow_link,
.inode_permission = selinux_inode_permission,
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 21:40:43 +0000