TOMOYO: Add rest of file operation restrictions.

LSM hooks for chmod()/chown()/chroot() are now ready.
This patch utilizes these hooks.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

5 files changed, 132 insertions, 61 deletions

diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index e0d0354008b7..6c6061682438 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -842,52 +842,27 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain)
                 if (ptr->type & TOMOYO_ACL_DELETED)
                         continue;
                 switch (tomoyo_acl_type2(ptr)) {
-                        struct tomoyo_single_path_acl_record *acl1;
-                        struct tomoyo_double_path_acl_record *acl2;
-                        u16 perm;
+                        struct tomoyo_single_path_acl_record *acl;
+                        u32 perm;
+                        u8 i;
                 case TOMOYO_TYPE_SINGLE_PATH_ACL:
-                        acl1 = container_of(ptr,
-                                    struct tomoyo_single_path_acl_record,
-                                            head);
-                        perm = acl1->perm;
-                        if (perm & (1 << TOMOYO_TYPE_EXECUTE_ACL))
-                                count++;
-                        if (perm &
-                            ((1 << TOMOYO_TYPE_READ_ACL) |
-                             (1 << TOMOYO_TYPE_WRITE_ACL)))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_CREATE_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_UNLINK_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_MKDIR_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_RMDIR_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_MKFIFO_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_MKSOCK_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_MKBLOCK_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_MKCHAR_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_TRUNCATE_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_SYMLINK_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_REWRITE_ACL))
-                                count++;
+                        acl = container_of(ptr,
+                                           struct tomoyo_single_path_acl_record,
+                                           head);
+                        perm = acl->perm | (((u32) acl->perm_high) << 16);
+                        for (i = 0; i < TOMOYO_MAX_SINGLE_PATH_OPERATION; i++)
+                                if (perm & (1 << i))
+                                        count++;
+                        if (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))
+                                count -= 2;
                         break;
                 case TOMOYO_TYPE_DOUBLE_PATH_ACL:
-                        acl2 = container_of(ptr,
+                        perm = container_of(ptr,
                                     struct tomoyo_double_path_acl_record,
-                                            head);
-                        perm = acl2->perm;
-                        if (perm & (1 << TOMOYO_TYPE_LINK_ACL))
-                                count++;
-                        if (perm & (1 << TOMOYO_TYPE_RENAME_ACL))
-                                count++;
+                                            head)->perm;
+                        for (i = 0; i < TOMOYO_MAX_DOUBLE_PATH_OPERATION; i++)
+                                if (perm & (1 << i))
+                                        count++;
                         break;
                 }
         }
@@ -1426,7 +1401,7 @@ static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head,
         u8 bit;
         const char *atmark = "";
         const char *filename;
-        const u16 perm = ptr->perm;
+        const u32 perm = ptr->perm | (((u32) ptr->perm_high) << 16);
 
         filename = ptr->filename->name;
         for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION;
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 92169d29b2db..bd10f9fa3511 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -108,7 +108,7 @@ struct tomoyo_path_info_with_data {
  *      (b) type & 0x80 : whether the entry is marked as "deleted".
  *
  * Packing "struct tomoyo_acl_info" allows
- * "struct tomoyo_single_path_acl_record" to embed "u16" and
+ * "struct tomoyo_single_path_acl_record" to embed "u8" + "u16" and
  * "struct tomoyo_double_path_acl_record" to embed "u8"
  * without enlarging their structure size.
  */
@@ -184,10 +184,13 @@ struct tomoyo_domain_info {
  * Directives held by this structure are "allow_read/write", "allow_execute",
  * "allow_read", "allow_write", "allow_create", "allow_unlink", "allow_mkdir",
  * "allow_rmdir", "allow_mkfifo", "allow_mksock", "allow_mkblock",
- * "allow_mkchar", "allow_truncate", "allow_symlink" and "allow_rewrite".
+ * "allow_mkchar", "allow_truncate", "allow_symlink", "allow_rewrite",
+ * "allow_chmod", "allow_chown", "allow_chgrp", "allow_chroot", "allow_mount"
+ * and "allow_unmount".
  */
 struct tomoyo_single_path_acl_record {
         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */
+        u8 perm_high;
         u16 perm;
         /* Pointer to single pathname. */
         const struct tomoyo_path_info *filename;
@@ -195,7 +198,7 @@ struct tomoyo_single_path_acl_record {
 
 /*
  * tomoyo_double_path_acl_record is a structure which is used for holding an
- * entry with two pathnames operation (i.e. link() and rename()).
+ * entry with two pathnames operation (i.e. link(), rename() and pivot_root()).
  * It has following fields.
  *
  *  (1) "head" which is a "struct tomoyo_acl_info".
@@ -203,7 +206,8 @@ struct tomoyo_single_path_acl_record {
  *  (3) "filename1" is the source/old pathname.
  *  (4) "filename2" is the destination/new pathname.
  *
- * Directives held by this structure are "allow_rename" and "allow_link".
+ * Directives held by this structure are "allow_rename", "allow_link" and
+ * "allow_pivot_root".
  */
 struct tomoyo_double_path_acl_record {
         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 5ae3a571559f..2d10f98fc551 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -81,12 +81,20 @@ static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = {
         [TOMOYO_TYPE_TRUNCATE_ACL]   = "truncate",
         [TOMOYO_TYPE_SYMLINK_ACL]    = "symlink",
         [TOMOYO_TYPE_REWRITE_ACL]    = "rewrite",
+        [TOMOYO_TYPE_IOCTL_ACL]      = "ioctl",
+        [TOMOYO_TYPE_CHMOD_ACL]      = "chmod",
+        [TOMOYO_TYPE_CHOWN_ACL]      = "chown",
+        [TOMOYO_TYPE_CHGRP_ACL]      = "chgrp",
+        [TOMOYO_TYPE_CHROOT_ACL]     = "chroot",
+        [TOMOYO_TYPE_MOUNT_ACL]      = "mount",
+        [TOMOYO_TYPE_UMOUNT_ACL]     = "unmount",
 };
 
 /* Keyword array for double path operations. */
 static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = {
         [TOMOYO_TYPE_LINK_ACL]    = "link",
         [TOMOYO_TYPE_RENAME_ACL]  = "rename",
+        [TOMOYO_TYPE_PIVOT_ROOT_ACL] = "pivot_root",
 };
 
 /**
@@ -655,7 +663,7 @@ static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info *
                                          domain,
                                          const struct tomoyo_path_info *
                                          filename,
-                                         const u16 perm,
+                                         const u32 perm,
                                          const bool may_use_pattern)
 {
         struct tomoyo_acl_info *ptr;
@@ -668,8 +676,13 @@ static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info *
                         continue;
                 acl = container_of(ptr, struct tomoyo_single_path_acl_record,
                                    head);
-                if (!(acl->perm & perm))
-                        continue;
+                if (perm <= 0xFFFF) {
+                        if (!(acl->perm & perm))
+                                continue;
+                } else {
+                        if (!(acl->perm_high & (perm >> 16)))
+                                continue;
+                }
                 if (may_use_pattern || !acl->filename->is_patterned) {
                         if (!tomoyo_path_matches_pattern(filename,
                                                          acl->filename))
@@ -697,7 +710,7 @@ static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain,
                                  const struct tomoyo_path_info *filename,
                                  const u8 operation)
 {
-        u16 perm = 0;
+        u32 perm = 0;
 
         if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
                 return 0;
@@ -830,13 +843,13 @@ static int tomoyo_update_single_path_acl(const u8 type, const char *filename,
                                          struct tomoyo_domain_info *
                                          const domain, const bool is_delete)
 {
-        static const u16 rw_mask =
+        static const u32 rw_mask =
                 (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL);
         const struct tomoyo_path_info *saved_filename;
         struct tomoyo_acl_info *ptr;
         struct tomoyo_single_path_acl_record *acl;
         int error = -ENOMEM;
-        const u16 perm = 1 << type;
+        const u32 perm = 1 << type;
 
         if (!domain)
                 return -EINVAL;
@@ -858,7 +871,10 @@ static int tomoyo_update_single_path_acl(const u8 type, const char *filename,
                 /* Special case. Clear all bits if marked as deleted. */
                 if (ptr->type & TOMOYO_ACL_DELETED)
                         acl->perm = 0;
-                acl->perm |= perm;
+                if (perm <= 0xFFFF)
+                        acl->perm |= perm;
+                else
+                        acl->perm_high |= (perm >> 16);
                 if ((acl->perm & rw_mask) == rw_mask)
                         acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL;
                 else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))
@@ -871,7 +887,10 @@ static int tomoyo_update_single_path_acl(const u8 type, const char *filename,
         acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_SINGLE_PATH_ACL);
         if (!acl)
                 goto out;
-        acl->perm = perm;
+        if (perm <= 0xFFFF)
+                acl->perm = perm;
+        else
+                acl->perm_high = (perm >> 16);
         if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL))
                 acl->perm |= rw_mask;
         acl->filename = saved_filename;
@@ -887,12 +906,15 @@ static int tomoyo_update_single_path_acl(const u8 type, const char *filename,
                                    head);
                 if (acl->filename != saved_filename)
                         continue;
-                acl->perm &= ~perm;
+                if (perm <= 0xFFFF)
+                        acl->perm &= ~perm;
+                else
+                        acl->perm_high &= ~(perm >> 16);
                 if ((acl->perm & rw_mask) != rw_mask)
                         acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL);
                 else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)))
                         acl->perm &= ~rw_mask;
-                if (!acl->perm)
+                if (!acl->perm && !acl->perm_high)
                         ptr->type |= TOMOYO_ACL_DELETED;
                 error = 0;
                 break;
@@ -1193,7 +1215,7 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 }
 
 /**
- * tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate" and "symlink".
+ * tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate", "symlink", "ioctl", "chmod", "chown", "chgrp", "chroot", "mount" and "unmount".
  *
  * @domain:    Pointer to "struct tomoyo_domain_info".
  * @operation: Type of operation.
@@ -1217,6 +1239,7 @@ int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain,
         switch (operation) {
         case TOMOYO_TYPE_MKDIR_ACL:
         case TOMOYO_TYPE_RMDIR_ACL:
+        case TOMOYO_TYPE_CHROOT_ACL:
                 if (!buf->is_dir) {
                         /*
                          * tomoyo_get_path() reserves space for appending "/."
@@ -1270,7 +1293,7 @@ int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
 }
 
 /**
- * tomoyo_check_2path_perm - Check permission for "rename" and "link".
+ * tomoyo_check_2path_perm - Check permission for "rename", "link" and "pivot_root".
  *
  * @domain:    Pointer to "struct tomoyo_domain_info".
  * @operation: Type of operation.
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
index 9548a0984cc4..3fb5f6ea4fc9 100644
--- a/security/tomoyo/tomoyo.c
+++ b/security/tomoyo/tomoyo.c
@@ -271,6 +271,60 @@ static int tomoyo_dentry_open(struct file *f, const struct cred *cred)
         return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
 }
 
+static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
+                             unsigned long arg)
+{
+        return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_IOCTL_ACL,
+                                       &file->f_path);
+}
+
+static int tomoyo_path_chmod(struct dentry *dentry, struct vfsmount *mnt,
+                             mode_t mode)
+{
+        struct path path = { mnt, dentry };
+        return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_CHMOD_ACL,
+                                       &path);
+}
+
+static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
+{
+        int error = 0;
+        if (uid != (uid_t) -1)
+                error = tomoyo_check_1path_perm(tomoyo_domain(),
+                                                TOMOYO_TYPE_CHOWN_ACL, path);
+        if (!error && gid != (gid_t) -1)
+                error = tomoyo_check_1path_perm(tomoyo_domain(),
+                                                TOMOYO_TYPE_CHGRP_ACL, path);
+        return error;
+}
+
+static int tomoyo_path_chroot(struct path *path)
+{
+        return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_CHROOT_ACL,
+                                       path);
+}
+
+static int tomoyo_sb_mount(char *dev_name, struct path *path,
+                           char *type, unsigned long flags, void *data)
+{
+        return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_MOUNT_ACL,
+                                       path);
+}
+
+static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
+{
+        struct path path = { mnt, mnt->mnt_root };
+        return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_UMOUNT_ACL,
+                                       &path);
+}
+
+static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)
+{
+        return tomoyo_check_2path_perm(tomoyo_domain(),
+                                       TOMOYO_TYPE_PIVOT_ROOT_ACL,
+                                       new_path, old_path);
+}
+
 /*
  * tomoyo_security_ops is a "struct security_operations" which is used for
  * registering TOMOYO.
@@ -295,6 +349,13 @@ static struct security_operations tomoyo_security_ops = {
         .path_mknod          = tomoyo_path_mknod,
         .path_link           = tomoyo_path_link,
         .path_rename         = tomoyo_path_rename,
+        .file_ioctl          = tomoyo_file_ioctl,
+        .path_chmod          = tomoyo_path_chmod,
+        .path_chown          = tomoyo_path_chown,
+        .path_chroot         = tomoyo_path_chroot,
+        .sb_mount            = tomoyo_sb_mount,
+        .sb_umount           = tomoyo_sb_umount,
+        .sb_pivotroot        = tomoyo_sb_pivotroot,
 };
 
 static int __init tomoyo_init(void)
diff --git a/security/tomoyo/tomoyo.h b/security/tomoyo/tomoyo.h
index cd6ba0bf7069..fac02655ea4b 100644
--- a/security/tomoyo/tomoyo.h
+++ b/security/tomoyo/tomoyo.h
@@ -64,11 +64,19 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm);
 #define TOMOYO_TYPE_TRUNCATE_ACL     12
 #define TOMOYO_TYPE_SYMLINK_ACL      13
 #define TOMOYO_TYPE_REWRITE_ACL      14
-#define TOMOYO_MAX_SINGLE_PATH_OPERATION 15
+#define TOMOYO_TYPE_IOCTL_ACL        15
+#define TOMOYO_TYPE_CHMOD_ACL        16
+#define TOMOYO_TYPE_CHOWN_ACL        17
+#define TOMOYO_TYPE_CHGRP_ACL        18
+#define TOMOYO_TYPE_CHROOT_ACL       19
+#define TOMOYO_TYPE_MOUNT_ACL        20
+#define TOMOYO_TYPE_UMOUNT_ACL       21
+#define TOMOYO_MAX_SINGLE_PATH_OPERATION 22
 
 #define TOMOYO_TYPE_LINK_ACL         0
 #define TOMOYO_TYPE_RENAME_ACL       1
-#define TOMOYO_MAX_DOUBLE_PATH_OPERATION 2
+#define TOMOYO_TYPE_PIVOT_ROOT_ACL   2
+#define TOMOYO_MAX_DOUBLE_PATH_OPERATION 3
 
 #define TOMOYO_DOMAINPOLICY          0
 #define TOMOYO_EXCEPTIONPOLICY       1