TOMOYO: Allow using owner/group etc. of file objects as conditions.

This patch adds support for permission checks using file object's DAC
attributes (e.g. owner/group) when checking file's pathnames. Hooks for passing
file object's pointers are in the last patch of this pathset.

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

4 files changed, 457 insertions, 0 deletions

diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c
index 9381d0e7f78f..4973edd40718 100644
--- a/security/tomoyo/audit.c
+++ b/security/tomoyo/audit.c
@@ -10,6 +10,35 @@
 #include <linux/slab.h>
 
 /**
+ * tomoyo_filetype - Get string representation of file type.
+ *
+ * @mode: Mode value for stat().
+ *
+ * Returns file type string.
+ */
+static inline const char *tomoyo_filetype(const mode_t mode)
+{
+	switch (mode & S_IFMT) {
+	case S_IFREG:
+	case 0:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FILE];
+	case S_IFDIR:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_DIRECTORY];
+	case S_IFLNK:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SYMLINK];
+	case S_IFIFO:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FIFO];
+	case S_IFSOCK:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SOCKET];
+	case S_IFBLK:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_BLOCK_DEV];
+	case S_IFCHR:
+		return tomoyo_condition_keyword[TOMOYO_TYPE_IS_CHAR_DEV];
+	}
+	return "unknown"; /* This should not happen. */
+}
+
+/**
  * tomoyo_print_header - Get header line of audit log.
  *
  * @r: Pointer to "struct tomoyo_request_info".
@@ -23,9 +52,11 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r)
 {
 	struct tomoyo_time stamp;
 	const pid_t gpid = task_pid_nr(current);
+	struct tomoyo_obj_info *obj = r->obj;
 	static const int tomoyo_buffer_len = 4096;
 	char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
 	int pos;
+	u8 i;
 	if (!buffer)
 		return NULL;
 	{
@@ -44,6 +75,47 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r)
 		       current_uid(), current_gid(), current_euid(),
 		       current_egid(), current_suid(), current_sgid(),
 		       current_fsuid(), current_fsgid());
+	if (!obj)
+		goto no_obj_info;
+	if (!obj->validate_done) {
+		tomoyo_get_attributes(obj);
+		obj->validate_done = true;
+	}
+	for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
+		struct tomoyo_mini_stat *stat;
+		unsigned int dev;
+		mode_t mode;
+		if (!obj->stat_valid[i])
+			continue;
+		stat = &obj->stat[i];
+		dev = stat->dev;
+		mode = stat->mode;
+		if (i & 1) {
+			pos += snprintf(buffer + pos,
+					tomoyo_buffer_len - 1 - pos,
+					" path%u.parent={ uid=%u gid=%u "
+					"ino=%lu perm=0%o }", (i >> 1) + 1,
+					stat->uid, stat->gid, (unsigned long)
+					stat->ino, stat->mode & S_IALLUGO);
+			continue;
+		}
+		pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
+				" path%u={ uid=%u gid=%u ino=%lu major=%u"
+				" minor=%u perm=0%o type=%s", (i >> 1) + 1,
+				stat->uid, stat->gid, (unsigned long)
+				stat->ino, MAJOR(dev), MINOR(dev),
+				mode & S_IALLUGO, tomoyo_filetype(mode));
+		if (S_ISCHR(mode) || S_ISBLK(mode)) {
+			dev = stat->rdev;
+			pos += snprintf(buffer + pos,
+					tomoyo_buffer_len - 1 - pos,
+					" dev_major=%u dev_minor=%u",
+					MAJOR(dev), MINOR(dev));
+		}
+		pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
+				" }");
+	}
+no_obj_info:
 	if (pos < tomoyo_buffer_len - 1)
 		return buffer;
 	kfree(buffer);
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 32ce1705b85a..ec02d2ab08c3 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -60,6 +60,51 @@ const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
 	[TOMOYO_TASK_FSGID]           = "task.fsgid",
 	[TOMOYO_TASK_PID]             = "task.pid",
 	[TOMOYO_TASK_PPID]            = "task.ppid",
+	[TOMOYO_TYPE_IS_SOCKET]       = "socket",
+	[TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
+	[TOMOYO_TYPE_IS_FILE]         = "file",
+	[TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
+	[TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
+	[TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
+	[TOMOYO_TYPE_IS_FIFO]         = "fifo",
+	[TOMOYO_MODE_SETUID]          = "setuid",
+	[TOMOYO_MODE_SETGID]          = "setgid",
+	[TOMOYO_MODE_STICKY]          = "sticky",
+	[TOMOYO_MODE_OWNER_READ]      = "owner_read",
+	[TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
+	[TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
+	[TOMOYO_MODE_GROUP_READ]      = "group_read",
+	[TOMOYO_MODE_GROUP_WRITE]     = "group_write",
+	[TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
+	[TOMOYO_MODE_OTHERS_READ]     = "others_read",
+	[TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
+	[TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
+	[TOMOYO_PATH1_UID]            = "path1.uid",
+	[TOMOYO_PATH1_GID]            = "path1.gid",
+	[TOMOYO_PATH1_INO]            = "path1.ino",
+	[TOMOYO_PATH1_MAJOR]          = "path1.major",
+	[TOMOYO_PATH1_MINOR]          = "path1.minor",
+	[TOMOYO_PATH1_PERM]           = "path1.perm",
+	[TOMOYO_PATH1_TYPE]           = "path1.type",
+	[TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
+	[TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
+	[TOMOYO_PATH2_UID]            = "path2.uid",
+	[TOMOYO_PATH2_GID]            = "path2.gid",
+	[TOMOYO_PATH2_INO]            = "path2.ino",
+	[TOMOYO_PATH2_MAJOR]          = "path2.major",
+	[TOMOYO_PATH2_MINOR]          = "path2.minor",
+	[TOMOYO_PATH2_PERM]           = "path2.perm",
+	[TOMOYO_PATH2_TYPE]           = "path2.type",
+	[TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
+	[TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
+	[TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
+	[TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
+	[TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
+	[TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
+	[TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
+	[TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
+	[TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
+	[TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
 };
 
 /* String table for PREFERENCE keyword. */
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 958d433b0115..5a0fcedb332b 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -54,10 +54,66 @@ enum tomoyo_conditions_index {
 	TOMOYO_TASK_FSGID,           /* current_fsgid() */
 	TOMOYO_TASK_PID,             /* sys_getpid()   */
 	TOMOYO_TASK_PPID,            /* sys_getppid()  */
+	TOMOYO_TYPE_IS_SOCKET,       /* S_IFSOCK */
+	TOMOYO_TYPE_IS_SYMLINK,      /* S_IFLNK */
+	TOMOYO_TYPE_IS_FILE,         /* S_IFREG */
+	TOMOYO_TYPE_IS_BLOCK_DEV,    /* S_IFBLK */
+	TOMOYO_TYPE_IS_DIRECTORY,    /* S_IFDIR */
+	TOMOYO_TYPE_IS_CHAR_DEV,     /* S_IFCHR */
+	TOMOYO_TYPE_IS_FIFO,         /* S_IFIFO */
+	TOMOYO_MODE_SETUID,          /* S_ISUID */
+	TOMOYO_MODE_SETGID,          /* S_ISGID */
+	TOMOYO_MODE_STICKY,          /* S_ISVTX */
+	TOMOYO_MODE_OWNER_READ,      /* S_IRUSR */
+	TOMOYO_MODE_OWNER_WRITE,     /* S_IWUSR */
+	TOMOYO_MODE_OWNER_EXECUTE,   /* S_IXUSR */
+	TOMOYO_MODE_GROUP_READ,      /* S_IRGRP */
+	TOMOYO_MODE_GROUP_WRITE,     /* S_IWGRP */
+	TOMOYO_MODE_GROUP_EXECUTE,   /* S_IXGRP */
+	TOMOYO_MODE_OTHERS_READ,     /* S_IROTH */
+	TOMOYO_MODE_OTHERS_WRITE,    /* S_IWOTH */
+	TOMOYO_MODE_OTHERS_EXECUTE,  /* S_IXOTH */
+	TOMOYO_PATH1_UID,
+	TOMOYO_PATH1_GID,
+	TOMOYO_PATH1_INO,
+	TOMOYO_PATH1_MAJOR,
+	TOMOYO_PATH1_MINOR,
+	TOMOYO_PATH1_PERM,
+	TOMOYO_PATH1_TYPE,
+	TOMOYO_PATH1_DEV_MAJOR,
+	TOMOYO_PATH1_DEV_MINOR,
+	TOMOYO_PATH2_UID,
+	TOMOYO_PATH2_GID,
+	TOMOYO_PATH2_INO,
+	TOMOYO_PATH2_MAJOR,
+	TOMOYO_PATH2_MINOR,
+	TOMOYO_PATH2_PERM,
+	TOMOYO_PATH2_TYPE,
+	TOMOYO_PATH2_DEV_MAJOR,
+	TOMOYO_PATH2_DEV_MINOR,
+	TOMOYO_PATH1_PARENT_UID,
+	TOMOYO_PATH1_PARENT_GID,
+	TOMOYO_PATH1_PARENT_INO,
+	TOMOYO_PATH1_PARENT_PERM,
+	TOMOYO_PATH2_PARENT_UID,
+	TOMOYO_PATH2_PARENT_GID,
+	TOMOYO_PATH2_PARENT_INO,
+	TOMOYO_PATH2_PARENT_PERM,
 	TOMOYO_MAX_CONDITION_KEYWORD,
 	TOMOYO_NUMBER_UNION,
 };
 
+
+/* Index numbers for stat(). */
+enum tomoyo_path_stat_index {
+	/* Do not change this order. */
+	TOMOYO_PATH1,
+	TOMOYO_PATH1_PARENT,
+	TOMOYO_PATH2,
+	TOMOYO_PATH2_PARENT,
+	TOMOYO_MAX_PATH_STAT
+};
+
 /* Index numbers for operation mode. */
 enum tomoyo_mode_index {
 	TOMOYO_CONFIG_DISABLED,
@@ -290,6 +346,11 @@ struct tomoyo_policy_namespace;
 
 /* Structure for request info. */
 struct tomoyo_request_info {
+	/*
+	 * For holding parameters specific to operations which deal files.
+	 * NULL if not dealing files.
+	 */
+	struct tomoyo_obj_info *obj;
 	struct tomoyo_domain_info *domain;
 	/* For holding parameters. */
 	union {
@@ -388,6 +449,35 @@ struct tomoyo_number_group {
 	struct tomoyo_number_union number;
 };
 
+/* Subset of "struct stat". Used by conditional ACL and audit logs. */
+struct tomoyo_mini_stat {
+	uid_t uid;
+	gid_t gid;
+	ino_t ino;
+	mode_t mode;
+	dev_t dev;
+	dev_t rdev;
+};
+
+/* Structure for attribute checks in addition to pathname checks. */
+struct tomoyo_obj_info {
+	/*
+	 * True if tomoyo_get_attributes() was already called, false otherwise.
+	 */
+	bool validate_done;
+	/* True if @stat[] is valid. */
+	bool stat_valid[TOMOYO_MAX_PATH_STAT];
+	/* First pathname. Initialized with { NULL, NULL } if no path. */
+	struct path path1;
+	/* Second pathname. Initialized with { NULL, NULL } if no path. */
+	struct path path2;
+	/*
+	 * Information on @path1, @path1's parent directory, @path2, @path2's
+	 * parent directory.
+	 */
+	struct tomoyo_mini_stat stat[TOMOYO_MAX_PATH_STAT];
+};
+
 /* Structure for entries which follows "struct tomoyo_condition". */
 struct tomoyo_condition_element {
 	/* Left hand operand. */
@@ -733,6 +823,7 @@ void tomoyo_check_profile(void);
 void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp);
 void tomoyo_del_condition(struct list_head *element);
 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
+void tomoyo_get_attributes(struct tomoyo_obj_info *obj);
 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 	 __printf(2, 3);
diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c
index 0692df3cddcc..ac7ebeb47d7d 100644
--- a/security/tomoyo/condition.c
+++ b/security/tomoyo/condition.c
@@ -244,6 +244,54 @@ out:
 }
 
 /**
+ * tomoyo_get_attributes - Revalidate "struct inode".
+ *
+ * @obj: Pointer to "struct tomoyo_obj_info".
+ *
+ * Returns nothing.
+ */
+void tomoyo_get_attributes(struct tomoyo_obj_info *obj)
+{
+	u8 i;
+	struct dentry *dentry = NULL;
+
+	for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
+		struct inode *inode;
+		switch (i) {
+		case TOMOYO_PATH1:
+			dentry = obj->path1.dentry;
+			if (!dentry)
+				continue;
+			break;
+		case TOMOYO_PATH2:
+			dentry = obj->path2.dentry;
+			if (!dentry)
+				continue;
+			break;
+		default:
+			if (!dentry)
+				continue;
+			dentry = dget_parent(dentry);
+			break;
+		}
+		inode = dentry->d_inode;
+		if (inode) {
+			struct tomoyo_mini_stat *stat = &obj->stat[i];
+			stat->uid  = inode->i_uid;
+			stat->gid  = inode->i_gid;
+			stat->ino  = inode->i_ino;
+			stat->mode = inode->i_mode;
+			stat->dev  = inode->i_sb->s_dev;
+			stat->rdev = inode->i_rdev;
+			obj->stat_valid[i] = true;
+		}
+		if (i & 1) /* i == TOMOYO_PATH1_PARENT ||
+			      i == TOMOYO_PATH2_PARENT */
+			dput(dentry);
+	}
+}
+
+/**
  * tomoyo_condition - Check condition part.
  *
  * @r:    Pointer to "struct tomoyo_request_info".
@@ -261,16 +309,19 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
 	unsigned long max_v[2] = { 0, 0 };
 	const struct tomoyo_condition_element *condp;
 	const struct tomoyo_number_union *numbers_p;
+	struct tomoyo_obj_info *obj;
 	u16 condc;
 	if (!cond)
 		return true;
 	condc = cond->condc;
+	obj = r->obj;
 	condp = (struct tomoyo_condition_element *) (cond + 1);
 	numbers_p = (const struct tomoyo_number_union *) (condp + condc);
 	for (i = 0; i < condc; i++) {
 		const bool match = condp->equals;
 		const u8 left = condp->left;
 		const u8 right = condp->right;
+		bool is_bitop[2] = { false, false };
 		u8 j;
 		condp++;
 		/* Check numeric or bit-op expressions. */
@@ -308,14 +359,185 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
 			case TOMOYO_TASK_PPID:
 				value = tomoyo_sys_getppid();
 				break;
+			case TOMOYO_TYPE_IS_SOCKET:
+				value = S_IFSOCK;
+				break;
+			case TOMOYO_TYPE_IS_SYMLINK:
+				value = S_IFLNK;
+				break;
+			case TOMOYO_TYPE_IS_FILE:
+				value = S_IFREG;
+				break;
+			case TOMOYO_TYPE_IS_BLOCK_DEV:
+				value = S_IFBLK;
+				break;
+			case TOMOYO_TYPE_IS_DIRECTORY:
+				value = S_IFDIR;
+				break;
+			case TOMOYO_TYPE_IS_CHAR_DEV:
+				value = S_IFCHR;
+				break;
+			case TOMOYO_TYPE_IS_FIFO:
+				value = S_IFIFO;
+				break;
+			case TOMOYO_MODE_SETUID:
+				value = S_ISUID;
+				break;
+			case TOMOYO_MODE_SETGID:
+				value = S_ISGID;
+				break;
+			case TOMOYO_MODE_STICKY:
+				value = S_ISVTX;
+				break;
+			case TOMOYO_MODE_OWNER_READ:
+				value = S_IRUSR;
+				break;
+			case TOMOYO_MODE_OWNER_WRITE:
+				value = S_IWUSR;
+				break;
+			case TOMOYO_MODE_OWNER_EXECUTE:
+				value = S_IXUSR;
+				break;
+			case TOMOYO_MODE_GROUP_READ:
+				value = S_IRGRP;
+				break;
+			case TOMOYO_MODE_GROUP_WRITE:
+				value = S_IWGRP;
+				break;
+			case TOMOYO_MODE_GROUP_EXECUTE:
+				value = S_IXGRP;
+				break;
+			case TOMOYO_MODE_OTHERS_READ:
+				value = S_IROTH;
+				break;
+			case TOMOYO_MODE_OTHERS_WRITE:
+				value = S_IWOTH;
+				break;
+			case TOMOYO_MODE_OTHERS_EXECUTE:
+				value = S_IXOTH;
+				break;
 			case TOMOYO_NUMBER_UNION:
 				/* Fetch values later. */
 				break;
 			default:
+				if (!obj)
+					goto out;
+				if (!obj->validate_done) {
+					tomoyo_get_attributes(obj);
+					obj->validate_done = true;
+				}
+				{
+					u8 stat_index;
+					struct tomoyo_mini_stat *stat;
+					switch (index) {
+					case TOMOYO_PATH1_UID:
+					case TOMOYO_PATH1_GID:
+					case TOMOYO_PATH1_INO:
+					case TOMOYO_PATH1_MAJOR:
+					case TOMOYO_PATH1_MINOR:
+					case TOMOYO_PATH1_TYPE:
+					case TOMOYO_PATH1_DEV_MAJOR:
+					case TOMOYO_PATH1_DEV_MINOR:
+					case TOMOYO_PATH1_PERM:
+						stat_index = TOMOYO_PATH1;
+						break;
+					case TOMOYO_PATH2_UID:
+					case TOMOYO_PATH2_GID:
+					case TOMOYO_PATH2_INO:
+					case TOMOYO_PATH2_MAJOR:
+					case TOMOYO_PATH2_MINOR:
+					case TOMOYO_PATH2_TYPE:
+					case TOMOYO_PATH2_DEV_MAJOR:
+					case TOMOYO_PATH2_DEV_MINOR:
+					case TOMOYO_PATH2_PERM:
+						stat_index = TOMOYO_PATH2;
+						break;
+					case TOMOYO_PATH1_PARENT_UID:
+					case TOMOYO_PATH1_PARENT_GID:
+					case TOMOYO_PATH1_PARENT_INO:
+					case TOMOYO_PATH1_PARENT_PERM:
+						stat_index =
+							TOMOYO_PATH1_PARENT;
+						break;
+					case TOMOYO_PATH2_PARENT_UID:
+					case TOMOYO_PATH2_PARENT_GID:
+					case TOMOYO_PATH2_PARENT_INO:
+					case TOMOYO_PATH2_PARENT_PERM:
+						stat_index =
+							TOMOYO_PATH2_PARENT;
+						break;
+					default:
+						goto out;
+					}
+					if (!obj->stat_valid[stat_index])
+						goto out;
+					stat = &obj->stat[stat_index];
+					switch (index) {
+					case TOMOYO_PATH1_UID:
+					case TOMOYO_PATH2_UID:
+					case TOMOYO_PATH1_PARENT_UID:
+					case TOMOYO_PATH2_PARENT_UID:
+						value = stat->uid;
+						break;
+					case TOMOYO_PATH1_GID:
+					case TOMOYO_PATH2_GID:
+					case TOMOYO_PATH1_PARENT_GID:
+					case TOMOYO_PATH2_PARENT_GID:
+						value = stat->gid;
+						break;
+					case TOMOYO_PATH1_INO:
+					case TOMOYO_PATH2_INO:
+					case TOMOYO_PATH1_PARENT_INO:
+					case TOMOYO_PATH2_PARENT_INO:
+						value = stat->ino;
+						break;
+					case TOMOYO_PATH1_MAJOR:
+					case TOMOYO_PATH2_MAJOR:
+						value = MAJOR(stat->dev);
+						break;
+					case TOMOYO_PATH1_MINOR:
+					case TOMOYO_PATH2_MINOR:
+						value = MINOR(stat->dev);
+						break;
+					case TOMOYO_PATH1_TYPE:
+					case TOMOYO_PATH2_TYPE:
+						value = stat->mode & S_IFMT;
+						break;
+					case TOMOYO_PATH1_DEV_MAJOR:
+					case TOMOYO_PATH2_DEV_MAJOR:
+						value = MAJOR(stat->rdev);
+						break;
+					case TOMOYO_PATH1_DEV_MINOR:
+					case TOMOYO_PATH2_DEV_MINOR:
+						value = MINOR(stat->rdev);
+						break;
+					case TOMOYO_PATH1_PERM:
+					case TOMOYO_PATH2_PERM:
+					case TOMOYO_PATH1_PARENT_PERM:
+					case TOMOYO_PATH2_PARENT_PERM:
+						value = stat->mode & S_IALLUGO;
+						break;
+					}
+				}
 				break;
 			}
 			max_v[j] = value;
 			min_v[j] = value;
+			switch (index) {
+			case TOMOYO_MODE_SETUID:
+			case TOMOYO_MODE_SETGID:
+			case TOMOYO_MODE_STICKY:
+			case TOMOYO_MODE_OWNER_READ:
+			case TOMOYO_MODE_OWNER_WRITE:
+			case TOMOYO_MODE_OWNER_EXECUTE:
+			case TOMOYO_MODE_GROUP_READ:
+			case TOMOYO_MODE_GROUP_WRITE:
+			case TOMOYO_MODE_GROUP_EXECUTE:
+			case TOMOYO_MODE_OTHERS_READ:
+			case TOMOYO_MODE_OTHERS_WRITE:
+			case TOMOYO_MODE_OTHERS_EXECUTE:
+				is_bitop[j] = true;
+			}
 		}
 		if (left == TOMOYO_NUMBER_UNION) {
 			/* Fetch values now. */
@@ -339,6 +561,33 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
 			}
 			goto out;
 		}
+		/*
+		 * Bit operation is valid only when counterpart value
+		 * represents permission.
+		 */
+		if (is_bitop[0] && is_bitop[1]) {
+			goto out;
+		} else if (is_bitop[0]) {
+			switch (right) {
+			case TOMOYO_PATH1_PERM:
+			case TOMOYO_PATH1_PARENT_PERM:
+			case TOMOYO_PATH2_PERM:
+			case TOMOYO_PATH2_PARENT_PERM:
+				if (!(max_v[0] & max_v[1]) == !match)
+					continue;
+			}
+			goto out;
+		} else if (is_bitop[1]) {
+			switch (left) {
+			case TOMOYO_PATH1_PERM:
+			case TOMOYO_PATH1_PARENT_PERM:
+			case TOMOYO_PATH2_PERM:
+			case TOMOYO_PATH2_PARENT_PERM:
+				if (!(max_v[0] & max_v[1]) == !match)
+					continue;
+			}
+			goto out;
+		}
 		/* Normal value range comparison. */
 		if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match)
 			continue;