Merge tag 'tomoyo-pr-20201012' of git://git.osdn.net/gitroot/tomoyo/tomoyo-test1
Pull tomoyo fix from Tetsuo HandaL
"One patch to make it possible to execute usermode-driver's path"
* tag 'tomoyo-pr-20201012' of git://git.osdn.net/gitroot/tomoyo/tomoyo-test1:
tomoyo: Loosen pathname/domainname validation.
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index eba0b33..a40abb0 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -143,6 +143,8 @@
return pos;
}
+static bool tomoyo_correct_path2(const char *filename, const size_t len);
+
/**
* tomoyo_get_domainname - Read a domainname from a line.
*
@@ -157,10 +159,10 @@
char *pos = start;
while (*pos) {
- if (*pos++ != ' ' || *pos++ == '/')
+ if (*pos++ != ' ' ||
+ tomoyo_correct_path2(pos, strchrnul(pos, ' ') - pos))
continue;
- pos -= 2;
- *pos++ = '\0';
+ *(pos - 1) = '\0';
break;
}
param->data = pos;
@@ -514,6 +516,22 @@
}
/**
+ * tomoyo_correct_path2 - Check whether the given pathname follows the naming rules.
+ *
+ * @filename: The pathname to check.
+ * @len: Length of @filename.
+ *
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+static bool tomoyo_correct_path2(const char *filename, const size_t len)
+{
+ const char *cp1 = memchr(filename, '/', len);
+ const char *cp2 = memchr(filename, '.', len);
+
+ return cp1 && (!cp2 || (cp1 < cp2)) && tomoyo_correct_word2(filename, len);
+}
+
+/**
* tomoyo_correct_path - Validate a pathname.
*
* @filename: The pathname to check.
@@ -523,7 +541,7 @@
*/
bool tomoyo_correct_path(const char *filename)
{
- return *filename == '/' && tomoyo_correct_word(filename);
+ return tomoyo_correct_path2(filename, strlen(filename));
}
/**
@@ -545,8 +563,7 @@
if (!cp)
break;
- if (*domainname != '/' ||
- !tomoyo_correct_word2(domainname, cp - domainname))
+ if (!tomoyo_correct_path2(domainname, cp - domainname))
return false;
domainname = cp + 1;
}
