TOMOYO: Allow using argv[]/envp[] of execve() as conditions.

This patch adds support for permission checks using argv[]/envp[] of execve()
request. Hooks 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>

security/tomoyo/audit.c

@@ -9,6 +9,104 @@
 #include "common.h"
 #include <linux/slab.h>
 
+/**
+ * tomoyo_print_bprm - Print "struct linux_binprm" for auditing.
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ * @dump: Pointer to "struct tomoyo_page_dump".
+ *
+ * Returns the contents of @bprm on success, NULL otherwise.
+ *
+ * This function uses kzalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+static char *tomoyo_print_bprm(struct linux_binprm *bprm,
+			       struct tomoyo_page_dump *dump)
+{
+	static const int tomoyo_buffer_len = 4096 * 2;
+	char *buffer = kzalloc(tomoyo_buffer_len, GFP_NOFS);
+	char *cp;
+	char *last_start;
+	int len;
+	unsigned long pos = bprm->p;
+	int offset = pos % PAGE_SIZE;
+	int argv_count = bprm->argc;
+	int envp_count = bprm->envc;
+	bool truncated = false;
+	if (!buffer)
+		return NULL;
+	len = snprintf(buffer, tomoyo_buffer_len - 1, "argv[]={ ");
+	cp = buffer + len;
+	if (!argv_count) {
+		memmove(cp, "} envp[]={ ", 11);
+		cp += 11;
+	}
+	last_start = cp;
+	while (argv_count || envp_count) {
+		if (!tomoyo_dump_page(bprm, pos, dump))
+			goto out;
+		pos += PAGE_SIZE - offset;
+		/* Read. */
+		while (offset < PAGE_SIZE) {
+			const char *kaddr = dump->data;
+			const unsigned char c = kaddr[offset++];
+			if (cp == last_start)
+				*cp++ = '"';
+			if (cp >= buffer + tomoyo_buffer_len - 32) {
+				/* Reserve some room for "..." string. */
+				truncated = true;
+			} else if (c == '\\') {
+				*cp++ = '\\';
+				*cp++ = '\\';
+			} else if (c > ' ' && c < 127) {
+				*cp++ = c;
+			} else if (!c) {
+				*cp++ = '"';
+				*cp++ = ' ';
+				last_start = cp;
+			} else {
+				*cp++ = '\\';
+				*cp++ = (c >> 6) + '0';
+				*cp++ = ((c >> 3) & 7) + '0';
+				*cp++ = (c & 7) + '0';
+			}
+			if (c)
+				continue;
+			if (argv_count) {
+				if (--argv_count == 0) {
+					if (truncated) {
+						cp = last_start;
+						memmove(cp, "... ", 4);
+						cp += 4;
+					}
+					memmove(cp, "} envp[]={ ", 11);
+					cp += 11;
+					last_start = cp;
+					truncated = false;
+				}
+			} else if (envp_count) {
+				if (--envp_count == 0) {
+					if (truncated) {
+						cp = last_start;
+						memmove(cp, "... ", 4);
+						cp += 4;
+					}
+				}
+			}
+			if (!argv_count && !envp_count)
+				break;
+		}
+		offset = 0;
+	}
+	*cp++ = '}';
+	*cp = '\0';
+	return buffer;
+out:
+	snprintf(buffer, tomoyo_buffer_len - 1,
+		 "argv[]={ ... } envp[]= { ... }");
+	return buffer;
+}
+
 /**
  * tomoyo_filetype - Get string representation of file type.
  *
@@ -139,6 +237,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
 		      va_list args)
 {
 	char *buf = NULL;
+	char *bprm_info = NULL;
 	const char *header = NULL;
 	char *realpath = NULL;
 	const char *symlink = NULL;
@@ -152,10 +251,11 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
 	if (r->ee) {
 		struct file *file = r->ee->bprm->file;
 		realpath = tomoyo_realpath_from_path(&file->f_path);
-		if (!realpath)
+		bprm_info = tomoyo_print_bprm(r->ee->bprm, &r->ee->dump);
+		if (!realpath || !bprm_info)
 			goto out;
-		/* +80 is for " exec={ realpath=\"%s\" }" */
-		len += strlen(realpath) + 80;
+		/* +80 is for " exec={ realpath=\"%s\" argc=%d envc=%d %s }" */
+		len += strlen(realpath) + 80 + strlen(bprm_info);
 	} else if (r->obj && r->obj->symlink_target) {
 		symlink = r->obj->symlink_target->name;
 		/* +18 is for " symlink.target=\"%s\"" */
@@ -168,8 +268,10 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
 	len--;
 	pos = snprintf(buf, len, "%s", header);
 	if (realpath) {
+		struct linux_binprm *bprm = r->ee->bprm;
 		pos += snprintf(buf + pos, len - pos,
-				" exec={ realpath=\"%s\" }", realpath);
+				" exec={ realpath=\"%s\" argc=%d envc=%d %s }",
+				realpath, bprm->argc, bprm->envc, bprm_info);
 	} else if (symlink)
 		pos += snprintf(buf + pos, len - pos, " symlink.target=\"%s\"",
 				symlink);
@@ -177,6 +279,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
 	vsnprintf(buf + pos, len - pos, fmt, args);
 out:
 	kfree(realpath);
+	kfree(bprm_info);
 	kfree(header);
 	return buf;
 }

security/tomoyo/common.c

@@ -60,6 +60,8 @@ 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_EXEC_ARGC]            = "exec.argc",
+	[TOMOYO_EXEC_ENVC]            = "exec.envc",
 	[TOMOYO_TYPE_IS_SOCKET]       = "socket",
 	[TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
 	[TOMOYO_TYPE_IS_FILE]         = "file",
@@ -1127,12 +1129,22 @@ static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
 			const struct tomoyo_name_union *names_p =
 				(typeof(names_p))
 				(numbers_p + cond->numbers_count);
+			const struct tomoyo_argv *argv =
+				(typeof(argv)) (names_p + cond->names_count);
+			const struct tomoyo_envp *envp =
+				(typeof(envp)) (argv + cond->argc);
 			u16 skip;
 			for (skip = 0; skip < head->r.cond_index; skip++) {
 				const u8 left = condp->left;
 				const u8 right = condp->right;
 				condp++;
 				switch (left) {
+				case TOMOYO_ARGV_ENTRY:
+					argv++;
+					continue;
+				case TOMOYO_ENVP_ENTRY:
+					envp++;
+					continue;
 				case TOMOYO_NUMBER_UNION:
 					numbers_p++;
 					break;
@@ -1156,6 +1168,34 @@ static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
 				head->r.cond_index++;
 				tomoyo_set_space(head);
 				switch (left) {
+				case TOMOYO_ARGV_ENTRY:
+					tomoyo_io_printf(head,
+							 "exec.argv[%lu]%s=\"",
+							 argv->index, argv->
+							 is_not ? "!" : "");
+					tomoyo_set_string(head,
+							  argv->value->name);
+					tomoyo_set_string(head, "\"");
+					argv++;
+					continue;
+				case TOMOYO_ENVP_ENTRY:
+					tomoyo_set_string(head,
+							  "exec.envp[\"");
+					tomoyo_set_string(head,
+							  envp->name->name);
+					tomoyo_io_printf(head, "\"]%s=", envp->
+							 is_not ? "!" : "");
+					if (envp->value) {
+						tomoyo_set_string(head, "\"");
+						tomoyo_set_string(head, envp->
+								  value->name);
+						tomoyo_set_string(head, "\"");
+					} else {
+						tomoyo_set_string(head,
+								  "NULL");
+					}
+					envp++;
+					continue;
 				case TOMOYO_NUMBER_UNION:
 					tomoyo_print_number_union_nospace
 						(head, numbers_p++);
@@ -1726,6 +1766,7 @@ static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
 {
 	char *buffer;
 	char *realpath = NULL;
+	char *argv0 = NULL;
 	char *symlink = NULL;
 	char *cp = strchr(header, '\n');
 	int len;
@@ -1738,6 +1779,11 @@ static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
 	len = strlen(cp) + 1;
 	/* strstr() will return NULL if ordering is wrong. */
 	if (*cp == 'f') {
+		argv0 = strstr(header, " argv[]={ \"");
+		if (argv0) {
+			argv0 += 10;
+			len += tomoyo_truncate(argv0) + 14;
+		}
 		realpath = strstr(header, " exec={ realpath=\"");
 		if (realpath) {
 			realpath += 8;
@@ -1753,6 +1799,8 @@ static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
 	snprintf(buffer, len - 1, "%s", cp);
 	if (realpath)
 		tomoyo_addprintf(buffer, len, " exec.%s", realpath);
+	if (argv0)
+		tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
 	if (symlink)
 		tomoyo_addprintf(buffer, len, "%s", symlink);
 	tomoyo_normalize_line(buffer);

security/tomoyo/common.h

@@ -54,6 +54,8 @@ enum tomoyo_conditions_index {
 	TOMOYO_TASK_FSGID,           /* current_fsgid() */
 	TOMOYO_TASK_PID,             /* sys_getpid()   */
 	TOMOYO_TASK_PPID,            /* sys_getppid()  */
+	TOMOYO_EXEC_ARGC,            /* "struct linux_binprm *"->argc */
+	TOMOYO_EXEC_ENVC,            /* "struct linux_binprm *"->envc */
 	TOMOYO_TYPE_IS_SOCKET,       /* S_IFSOCK */
 	TOMOYO_TYPE_IS_SYMLINK,      /* S_IFLNK */
 	TOMOYO_TYPE_IS_FILE,         /* S_IFREG */
@@ -104,6 +106,8 @@ enum tomoyo_conditions_index {
 	TOMOYO_MAX_CONDITION_KEYWORD,
 	TOMOYO_NUMBER_UNION,
 	TOMOYO_NAME_UNION,
+	TOMOYO_ARGV_ENTRY,
+	TOMOYO_ENVP_ENTRY,
 };
 
 
@@ -467,6 +471,12 @@ struct tomoyo_mini_stat {
 	dev_t rdev;
 };
 
+/* Structure for dumping argv[] and envp[] of "struct linux_binprm". */
+struct tomoyo_page_dump {
+	struct page *page;    /* Previously dumped page. */
+	char *data;           /* Contents of "page". Size is PAGE_SIZE. */
+};
+
 /* Structure for attribute checks in addition to pathname checks. */
 struct tomoyo_obj_info {
 	/*
@@ -491,20 +501,45 @@ struct tomoyo_obj_info {
 	struct tomoyo_path_info *symlink_target;
 };
 
+/* Structure for argv[]. */
+struct tomoyo_argv {
+	unsigned long index;
+	const struct tomoyo_path_info *value;
+	bool is_not;
+};
+
+/* Structure for envp[]. */
+struct tomoyo_envp {
+	const struct tomoyo_path_info *name;
+	const struct tomoyo_path_info *value;
+	bool is_not;
+};
+
 /* Structure for execve() operation. */
 struct tomoyo_execve {
 	struct tomoyo_request_info r;
 	struct tomoyo_obj_info obj;
 	struct linux_binprm *bprm;
+	/* For dumping argv[] and envp[]. */
+	struct tomoyo_page_dump dump;
 	/* For temporary use. */
 	char *tmp; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
 };
 
 /* Structure for entries which follows "struct tomoyo_condition". */
 struct tomoyo_condition_element {
-	/* Left hand operand. */
+	/*
+	 * Left hand operand. A "struct tomoyo_argv" for TOMOYO_ARGV_ENTRY, a
+	 * "struct tomoyo_envp" for TOMOYO_ENVP_ENTRY is attached to the tail
+	 * of the array of this struct.
+	 */
 	u8 left;
-	/* Right hand operand. */
+	/*
+	 * Right hand operand. A "struct tomoyo_number_union" for
+	 * TOMOYO_NUMBER_UNION, a "struct tomoyo_name_union" for
+	 * TOMOYO_NAME_UNION is attached to the tail of the array of this
+	 * struct.
+	 */
 	u8 right;
 	/* Equation operator. True if equals or overlaps, false otherwise. */
 	bool equals;
@@ -517,10 +552,14 @@ struct tomoyo_condition {
 	u16 condc; /* Number of conditions in this struct. */
 	u16 numbers_count; /* Number of "struct tomoyo_number_union values". */
 	u16 names_count; /* Number of "struct tomoyo_name_union names". */
+	u16 argc; /* Number of "struct tomoyo_argv". */
+	u16 envc; /* Number of "struct tomoyo_envp". */
 	/*
 	 * struct tomoyo_condition_element condition[condc];
 	 * struct tomoyo_number_union values[numbers_count];
 	 * struct tomoyo_name_union names[names_count];
+	 * struct tomoyo_argv argv[argc];
+	 * struct tomoyo_envp envp[envc];
 	 */
 };
 
@@ -751,6 +790,8 @@ bool tomoyo_correct_path(const char *filename);
 bool tomoyo_correct_word(const char *string);
 bool tomoyo_domain_def(const unsigned char *buffer);
 bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
+bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
+		      struct tomoyo_page_dump *dump);
 bool tomoyo_memory_ok(void *ptr);
 bool tomoyo_number_matches_group(const unsigned long min,
 				 const unsigned long max,

security/tomoyo/condition.c

@@ -10,6 +10,209 @@
 /* List of "struct tomoyo_condition". */
 LIST_HEAD(tomoyo_condition_list);
 
+/**
+ * tomoyo_argv - Check argv[] in "struct linux_binbrm".
+ *
+ * @index:   Index number of @arg_ptr.
+ * @arg_ptr: Contents of argv[@index].
+ * @argc:    Length of @argv.
+ * @argv:    Pointer to "struct tomoyo_argv".
+ * @checked: Set to true if @argv[@index] was found.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_argv(const unsigned int index, const char *arg_ptr,
+			const int argc, const struct tomoyo_argv *argv,
+			u8 *checked)
+{
+	int i;
+	struct tomoyo_path_info arg;
+	arg.name = arg_ptr;
+	for (i = 0; i < argc; argv++, checked++, i++) {
+		bool result;
+		if (index != argv->index)
+			continue;
+		*checked = 1;
+		tomoyo_fill_path_info(&arg);
+		result = tomoyo_path_matches_pattern(&arg, argv->value);
+		if (argv->is_not)
+			result = !result;
+		if (!result)
+			return false;
+	}
+	return true;
+}
+
+/**
+ * tomoyo_envp - Check envp[] in "struct linux_binbrm".
+ *
+ * @env_name:  The name of environment variable.
+ * @env_value: The value of environment variable.
+ * @envc:      Length of @envp.
+ * @envp:      Pointer to "struct tomoyo_envp".
+ * @checked:   Set to true if @envp[@env_name] was found.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_envp(const char *env_name, const char *env_value,
+			const int envc, const struct tomoyo_envp *envp,
+			u8 *checked)
+{
+	int i;
+	struct tomoyo_path_info name;
+	struct tomoyo_path_info value;
+	name.name = env_name;
+	tomoyo_fill_path_info(&name);
+	value.name = env_value;
+	tomoyo_fill_path_info(&value);
+	for (i = 0; i < envc; envp++, checked++, i++) {
+		bool result;
+		if (!tomoyo_path_matches_pattern(&name, envp->name))
+			continue;
+		*checked = 1;
+		if (envp->value) {
+			result = tomoyo_path_matches_pattern(&value,
+							     envp->value);
+			if (envp->is_not)
+				result = !result;
+		} else {
+			result = true;
+			if (!envp->is_not)
+				result = !result;
+		}
+		if (!result)
+			return false;
+	}
+	return true;
+}
+
+/**
+ * tomoyo_scan_bprm - Scan "struct linux_binprm".
+ *
+ * @ee:   Pointer to "struct tomoyo_execve".
+ * @argc: Length of @argc.
+ * @argv: Pointer to "struct tomoyo_argv".
+ * @envc: Length of @envp.
+ * @envp: Poiner to "struct tomoyo_envp".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_scan_bprm(struct tomoyo_execve *ee,
+			     const u16 argc, const struct tomoyo_argv *argv,
+			     const u16 envc, const struct tomoyo_envp *envp)
+{
+	struct linux_binprm *bprm = ee->bprm;
+	struct tomoyo_page_dump *dump = &ee->dump;
+	char *arg_ptr = ee->tmp;
+	int arg_len = 0;
+	unsigned long pos = bprm->p;
+	int offset = pos % PAGE_SIZE;
+	int argv_count = bprm->argc;
+	int envp_count = bprm->envc;
+	bool result = true;
+	u8 local_checked[32];
+	u8 *checked;
+	if (argc + envc <= sizeof(local_checked)) {
+		checked = local_checked;
+		memset(local_checked, 0, sizeof(local_checked));
+	} else {
+		checked = kzalloc(argc + envc, GFP_NOFS);
+		if (!checked)
+			return false;
+	}
+	while (argv_count || envp_count) {
+		if (!tomoyo_dump_page(bprm, pos, dump)) {
+			result = false;
+			goto out;
+		}
+		pos += PAGE_SIZE - offset;
+		while (offset < PAGE_SIZE) {
+			/* Read. */
+			const char *kaddr = dump->data;
+			const unsigned char c = kaddr[offset++];
+			if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
+				if (c == '\\') {
+					arg_ptr[arg_len++] = '\\';
+					arg_ptr[arg_len++] = '\\';
+				} else if (c > ' ' && c < 127) {
+					arg_ptr[arg_len++] = c;
+				} else {
+					arg_ptr[arg_len++] = '\\';
+					arg_ptr[arg_len++] = (c >> 6) + '0';
+					arg_ptr[arg_len++] =
+						((c >> 3) & 7) + '0';
+					arg_ptr[arg_len++] = (c & 7) + '0';
+				}
+			} else {
+				arg_ptr[arg_len] = '\0';
+			}
+			if (c)
+				continue;
+			/* Check. */
+			if (argv_count) {
+				if (!tomoyo_argv(bprm->argc - argv_count,
+						 arg_ptr, argc, argv,
+						 checked)) {
+					result = false;
+					break;
+				}
+				argv_count--;
+			} else if (envp_count) {
+				char *cp = strchr(arg_ptr, '=');
+				if (cp) {
+					*cp = '\0';
+					if (!tomoyo_envp(arg_ptr, cp + 1,
+							 envc, envp,
+							 checked + argc)) {
+						result = false;
+						break;
+					}
+				}
+				envp_count--;
+			} else {
+				break;
+			}
+			arg_len = 0;
+		}
+		offset = 0;
+		if (!result)
+			break;
+	}
+out:
+	if (result) {
+		int i;
+		/* Check not-yet-checked entries. */
+		for (i = 0; i < argc; i++) {
+			if (checked[i])
+				continue;
+			/*
+			 * Return true only if all unchecked indexes in
+			 * bprm->argv[] are not matched.
+			 */
+			if (argv[i].is_not)
+				continue;
+			result = false;
+			break;
+		}
+		for (i = 0; i < envc; envp++, i++) {
+			if (checked[argc + i])
+				continue;
+			/*
+			 * Return true only if all unchecked environ variables
+			 * in bprm->envp[] are either undefined or not matched.
+			 */
+			if ((!envp->value && !envp->is_not) ||
+			    (envp->value && envp->is_not))
+				continue;
+			result = false;
+			break;
+		}
+	}
+	if (checked != local_checked)
+		kfree(checked);
+	return result;
+}
+
 /**
  * tomoyo_scan_exec_realpath - Check "exec.realpath" parameter of "struct tomoyo_condition".
  *
@@ -72,6 +275,64 @@ static bool tomoyo_parse_name_union_quoted(struct tomoyo_acl_param *param,
 	return ptr->filename != NULL;
 }
 
+/**
+ * tomoyo_parse_argv - Parse an argv[] condition part.
+ *
+ * @left:  Lefthand value.
+ * @right: Righthand value.
+ * @argv:  Pointer to "struct tomoyo_argv".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_parse_argv(char *left, char *right,
+			      struct tomoyo_argv *argv)
+{
+	if (tomoyo_parse_ulong(&argv->index, &left) !=
+	    TOMOYO_VALUE_TYPE_DECIMAL || *left++ != ']' || *left)
+		return false;
+	argv->value = tomoyo_get_dqword(right);
+	return argv->value != NULL;
+}
+
+/**
+ * tomoyo_parse_envp - Parse an envp[] condition part.
+ *
+ * @left:  Lefthand value.
+ * @right: Righthand value.
+ * @envp:  Pointer to "struct tomoyo_envp".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_parse_envp(char *left, char *right,
+			      struct tomoyo_envp *envp)
+{
+	const struct tomoyo_path_info *name;
+	const struct tomoyo_path_info *value;
+	char *cp = left + strlen(left) - 1;
+	if (*cp-- != ']' || *cp != '"')
+		goto out;
+	*cp = '\0';
+	if (!tomoyo_correct_word(left))
+		goto out;
+	name = tomoyo_get_name(left);
+	if (!name)
+		goto out;
+	if (!strcmp(right, "NULL")) {
+		value = NULL;
+	} else {
+		value = tomoyo_get_dqword(right);
+		if (!value) {
+			tomoyo_put_name(name);
+			goto out;
+		}
+	}
+	envp->name = name;
+	envp->value = value;
+	return true;
+out:
+	return false;
+}
+
 /**
  * tomoyo_same_condition - Check for duplicated "struct tomoyo_condition" entry.
  *
@@ -86,6 +347,7 @@ static inline bool tomoyo_same_condition(const struct tomoyo_condition *a,
 	return a->size == b->size && a->condc == b->condc &&
 		a->numbers_count == b->numbers_count &&
 		a->names_count == b->names_count &&
+		a->argc == b->argc && a->envc == b->envc &&
 		!memcmp(a + 1, b + 1, a->size - sizeof(*a));
 }
 
@@ -178,6 +440,8 @@ struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param)
 	struct tomoyo_condition_element *condp = NULL;
 	struct tomoyo_number_union *numbers_p = NULL;
 	struct tomoyo_name_union *names_p = NULL;
+	struct tomoyo_argv *argv = NULL;
+	struct tomoyo_envp *envp = NULL;
 	struct tomoyo_condition e = { };
 	char * const start_of_string = param->data;
 	char * const end_of_string = start_of_string + strlen(start_of_string);
@@ -222,6 +486,36 @@ rerun:
 			goto out;
 		dprintk(KERN_WARNING "%u: <%s>%s=<%s>\n", __LINE__, left_word,
 			is_not ? "!" : "", right_word);
+		if (!strncmp(left_word, "exec.argv[", 10)) {
+			if (!argv) {
+				e.argc++;
+				e.condc++;
+			} else {
+				e.argc--;
+				e.condc--;
+				left = TOMOYO_ARGV_ENTRY;
+				argv->is_not = is_not;
+				if (!tomoyo_parse_argv(left_word + 10,
+						       right_word, argv++))
+					goto out;
+			}
+			goto store_value;
+		}
+		if (!strncmp(left_word, "exec.envp[\"", 11)) {
+			if (!envp) {
+				e.envc++;
+				e.condc++;
+			} else {
+				e.envc--;
+				e.condc--;
+				left = TOMOYO_ENVP_ENTRY;
+				envp->is_not = is_not;
+				if (!tomoyo_parse_envp(left_word + 11,
+						       right_word, envp++))
+					goto out;
+			}
+			goto store_value;
+		}
 		left = tomoyo_condition_type(left_word);
 		dprintk(KERN_WARNING "%u: <%s> left=%u\n", __LINE__, left_word,
 			left);
@@ -283,16 +577,20 @@ store_value:
 			condp->equals);
 		condp++;
 	}
-	dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u\n",
-		__LINE__, e.condc, e.numbers_count, e.names_count);
+	dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u ac=%u ec=%u\n",
+		__LINE__, e.condc, e.numbers_count, e.names_count, e.argc,
+		e.envc);
 	if (entry) {
-		BUG_ON(e.names_count | e.numbers_count | e.condc);
+		BUG_ON(e.names_count | e.numbers_count | e.argc | e.envc |
+		       e.condc);
 		return tomoyo_commit_condition(entry);
 	}
 	e.size = sizeof(*entry)
 		+ e.condc * sizeof(struct tomoyo_condition_element)
 		+ e.numbers_count * sizeof(struct tomoyo_number_union)
-		+ e.names_count * sizeof(struct tomoyo_name_union);
+		+ e.names_count * sizeof(struct tomoyo_name_union)
+		+ e.argc * sizeof(struct tomoyo_argv)
+		+ e.envc * sizeof(struct tomoyo_envp);
 	entry = kzalloc(e.size, GFP_NOFS);
 	if (!entry)
 		return NULL;
@@ -300,6 +598,8 @@ store_value:
 	condp = (struct tomoyo_condition_element *) (entry + 1);
 	numbers_p = (struct tomoyo_number_union *) (condp + e.condc);
 	names_p = (struct tomoyo_name_union *) (numbers_p + e.numbers_count);
+	argv = (struct tomoyo_argv *) (names_p + e.names_count);
+	envp = (struct tomoyo_envp *) (argv + e.argc);
 	{
 		bool flag = false;
 		for (pos = start_of_string; pos < end_of_string; pos++) {
@@ -391,16 +691,29 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
 	const struct tomoyo_condition_element *condp;
 	const struct tomoyo_number_union *numbers_p;
 	const struct tomoyo_name_union *names_p;
+	const struct tomoyo_argv *argv;
+	const struct tomoyo_envp *envp;
 	struct tomoyo_obj_info *obj;
 	u16 condc;
+	u16 argc;
+	u16 envc;
+	struct linux_binprm *bprm = NULL;
 	if (!cond)
 		return true;
 	condc = cond->condc;
+	argc = cond->argc;
+	envc = cond->envc;
 	obj = r->obj;
+	if (r->ee)
+		bprm = r->ee->bprm;
+	if (!bprm && (argc || envc))
+		return false;
 	condp = (struct tomoyo_condition_element *) (cond + 1);
 	numbers_p = (const struct tomoyo_number_union *) (condp + condc);
 	names_p = (const struct tomoyo_name_union *)
 		(numbers_p + cond->numbers_count);
+	argv = (const struct tomoyo_argv *) (names_p + cond->names_count);
+	envp = (const struct tomoyo_envp *) (argv + argc);
 	for (i = 0; i < condc; i++) {
 		const bool match = condp->equals;
 		const u8 left = condp->left;
@@ -408,6 +721,9 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
 		bool is_bitop[2] = { false, false };
 		u8 j;
 		condp++;
+		/* Check argv[] and envp[] later. */
+		if (left == TOMOYO_ARGV_ENTRY || left == TOMOYO_ENVP_ENTRY)
+			continue;
 		/* Check string expressions. */
 		if (right == TOMOYO_NAME_UNION) {
 			const struct tomoyo_name_union *ptr = names_p++;
@@ -524,6 +840,16 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
 			case TOMOYO_MODE_OTHERS_EXECUTE:
 				value = S_IXOTH;
 				break;
+			case TOMOYO_EXEC_ARGC:
+				if (!bprm)
+					goto out;
+				value = bprm->argc;
+				break;
+			case TOMOYO_EXEC_ENVC:
+				if (!bprm)
+					goto out;
+				value = bprm->envc;
+				break;
 			case TOMOYO_NUMBER_UNION:
 				/* Fetch values later. */
 				break;
@@ -702,5 +1028,8 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
 out:
 		return false;
 	}
+	/* Check argv[] and envp[] now. */
+	if (r->ee && (argc || envc))
+		return tomoyo_scan_bprm(r->ee, argc, argv, envc, envp);
 	return true;
 }

security/tomoyo/domain.c

@@ -713,3 +713,49 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
 	kfree(tmp);
 	return retval;
 }
+
+/**
+ * tomoyo_dump_page - Dump a page to buffer.
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ * @pos:  Location to dump.
+ * @dump: Poiner to "struct tomoyo_page_dump".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
+		      struct tomoyo_page_dump *dump)
+{
+	struct page *page;
+	/* dump->data is released by tomoyo_finish_execve(). */
+	if (!dump->data) {
+		dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
+		if (!dump->data)
+			return false;
+	}
+	/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */
+#ifdef CONFIG_MMU
+	if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0)
+		return false;
+#else
+	page = bprm->page[pos / PAGE_SIZE];
+#endif
+	if (page != dump->page) {
+		const unsigned int offset = pos % PAGE_SIZE;
+		/*
+		 * Maybe kmap()/kunmap() should be used here.
+		 * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic().
+		 * So do I.
+		 */
+		char *kaddr = kmap_atomic(page, KM_USER0);
+		dump->page = page;
+		memcpy(dump->data + offset, kaddr + offset,
+		       PAGE_SIZE - offset);
+		kunmap_atomic(kaddr, KM_USER0);
+	}
+	/* Same with put_arg_page(page) in fs/exec.c */
+#ifdef CONFIG_MMU
+	put_page(page);
+#endif
+	return true;
+}

security/tomoyo/gc.c

@@ -358,6 +358,8 @@ void tomoyo_del_condition(struct list_head *element)
 	const u16 condc = cond->condc;
 	const u16 numbers_count = cond->numbers_count;
 	const u16 names_count = cond->names_count;
+	const u16 argc = cond->argc;
+	const u16 envc = cond->envc;
 	unsigned int i;
 	const struct tomoyo_condition_element *condp
 		= (const struct tomoyo_condition_element *) (cond + 1);
@@ -365,10 +367,20 @@ void tomoyo_del_condition(struct list_head *element)
 		= (struct tomoyo_number_union *) (condp + condc);
 	struct tomoyo_name_union *names_p
 		= (struct tomoyo_name_union *) (numbers_p + numbers_count);
+	const struct tomoyo_argv *argv
+		= (const struct tomoyo_argv *) (names_p + names_count);
+	const struct tomoyo_envp *envp
+		= (const struct tomoyo_envp *) (argv + argc);
 	for (i = 0; i < numbers_count; i++)
 		tomoyo_put_number_union(numbers_p++);
 	for (i = 0; i < names_count; i++)
 		tomoyo_put_name_union(names_p++);
+	for (i = 0; i < argc; argv++, i++)
+		tomoyo_put_name(argv->value);
+	for (i = 0; i < envc; envp++, i++) {
+		tomoyo_put_name(envp->name);
+		tomoyo_put_name(envp->value);
+	}
 }
 
 /**