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gcc-plugins: structleak: add option to init all vars used as byref args

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In the Linux kernel, struct type variables are rarely passed by-value,
and so functions that initialize such variables typically take an input
reference to the variable rather than returning a value that can
subsequently be used in an assignment.

If the initalization function is not part of the same compilation unit,
the lack of an assignment operation defeats any analysis the compiler
can perform as to whether the variable may be used before having been
initialized. This means we may end up passing on such variables
uninitialized, resulting in potential information leaks.

So extend the existing structleak GCC plugin so it will [optionally]
apply to all struct type variables that have their address taken at any
point, rather than only to variables of struct types that have a __user
annotation.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Ard Biesheuvel 2017-08-06 12:06:27 +01:00 committed by Kees Cook
parent 520eccdfe1
commit f7dd250789
3 changed files with 19 additions and 2 deletions
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7
arch/Kconfig
View File

@ -458,6 +458,13 @@ config GCC_PLUGIN_STRUCTLEAK
* https://grsecurity.net/
* https://pax.grsecurity.net/
config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
bool "Force initialize all struct type variables passed by reference"
depends on GCC_PLUGIN_STRUCTLEAK
help
Zero initialize any struct type local variable that may be passed by
reference without having been initialized.
config GCC_PLUGIN_STRUCTLEAK_VERBOSE
bool "Report forcefully initialized variables"
depends on GCC_PLUGIN_STRUCTLEAK

1
scripts/Makefile.gcc-plugins
View File

@ -27,6 +27,7 @@ ifdef CONFIG_GCC_PLUGINS
gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += structleak_plugin.so
gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE) += -fplugin-arg-structleak_plugin-verbose
gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL) += -fplugin-arg-structleak_plugin-byref-all
gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += -DSTRUCTLEAK_PLUGIN
gcc-plugin-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) += randomize_layout_plugin.so

13
scripts/gcc-plugins/structleak_plugin.c
View File

@ -16,6 +16,7 @@
* Options:
* -fplugin-arg-structleak_plugin-disable
* -fplugin-arg-structleak_plugin-verbose
* -fplugin-arg-structleak_plugin-byref-all
*
* Usage:
* $ # for 4.5/4.6/C based 4.7
@ -42,6 +43,7 @@ static struct plugin_info structleak_plugin_info = {
};
static bool verbose;
static bool byref_all;
static tree handle_user_attribute(tree *node, tree name, tree args, int flags, bool *no_add_attrs)
{
@ -150,7 +152,9 @@ static void initialize(tree var)
/* these aren't the 0days you're looking for */
if (verbose)
inform(DECL_SOURCE_LOCATION(var),
"userspace variable will be forcibly initialized");
"%s variable will be forcibly initialized",
(byref_all && TREE_ADDRESSABLE(var)) ? "byref"
: "userspace");
/* build the initializer expression */
initializer = build_constructor(TREE_TYPE(var), NULL);
@ -190,7 +194,8 @@ static unsigned int structleak_execute(void)
continue;
/* if the type is of interest, examine the variable */
if (TYPE_USERSPACE(type))
if (TYPE_USERSPACE(type) ||
(byref_all && TREE_ADDRESSABLE(var)))
initialize(var);
}
@ -232,6 +237,10 @@ __visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gc
verbose = true;
continue;
}
if (!strcmp(argv[i].key, "byref-all")) {
byref_all = true;
continue;
}
error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
}