Merge tag 'gcc-plugins-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull gcc plugins update from Kees Cook:
"This finishes the porting work on randstruct, and introduces a new
option to structleak, both noted below:
- For the randstruct plugin, enable automatic randomization of
structures that are entirely function pointers (along with a couple
designated initializer fixes).
- For the structleak plugin, provide an option to perform zeroing
initialization of all otherwise uninitialized stack variables that
are passed by reference (Ard Biesheuvel)"
* tag 'gcc-plugins-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
gcc-plugins: structleak: add option to init all vars used as byref args
randstruct: Enable function pointer struct detection
drivers/net/wan/z85230.c: Use designated initializers
drm/amd/powerplay: rv: Use designated initializers
diff --git a/arch/Kconfig b/arch/Kconfig
index 2520ca5..1aafb4e 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -458,6 +458,13 @@
* 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
@@ -473,11 +480,13 @@
depends on GCC_PLUGINS
select MODVERSIONS if MODULES
help
- If you say Y here, the layouts of structures explicitly
- marked by __randomize_layout will be randomized at
- compile-time. This can introduce the requirement of an
- additional information exposure vulnerability for exploits
- targeting these structure types.
+ If you say Y here, the layouts of structures that are entirely
+ function pointers (and have not been manually annotated with
+ __no_randomize_layout), or structures that have been explicitly
+ marked with __randomize_layout, will be randomized at compile-time.
+ This can introduce the requirement of an additional information
+ exposure vulnerability for exploits targeting these structure
+ types.
Enabling this feature will introduce some performance impact,
slightly increase memory usage, and prevent the use of forensic
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c
index edc5fb6..2c3e6ba 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c
@@ -317,8 +317,8 @@ static int rv_tf_set_num_active_display(struct pp_hwmgr *hwmgr, void *input,
}
static const struct phm_master_table_item rv_set_power_state_list[] = {
- { NULL, rv_tf_set_clock_limit },
- { NULL, rv_tf_set_num_active_display },
+ { .tableFunction = rv_tf_set_clock_limit },
+ { .tableFunction = rv_tf_set_num_active_display },
{ }
};
@@ -391,7 +391,7 @@ static int rv_tf_disable_gfx_off(struct pp_hwmgr *hwmgr,
}
static const struct phm_master_table_item rv_disable_dpm_list[] = {
- {NULL, rv_tf_disable_gfx_off},
+ { .tableFunction = rv_tf_disable_gfx_off },
{ },
};
@@ -416,7 +416,7 @@ static int rv_tf_enable_gfx_off(struct pp_hwmgr *hwmgr,
}
static const struct phm_master_table_item rv_enable_dpm_list[] = {
- {NULL, rv_tf_enable_gfx_off},
+ { .tableFunction = rv_tf_enable_gfx_off },
{ },
};
diff --git a/drivers/net/wan/z85230.c b/drivers/net/wan/z85230.c
index 2f0bd69..deea41e 100644
--- a/drivers/net/wan/z85230.c
+++ b/drivers/net/wan/z85230.c
@@ -483,11 +483,10 @@ static void z8530_status(struct z8530_channel *chan)
write_zsctrl(chan, RES_H_IUS);
}
-struct z8530_irqhandler z8530_sync =
-{
- z8530_rx,
- z8530_tx,
- z8530_status
+struct z8530_irqhandler z8530_sync = {
+ .rx = z8530_rx,
+ .tx = z8530_tx,
+ .status = z8530_status,
};
EXPORT_SYMBOL(z8530_sync);
@@ -605,15 +604,15 @@ static void z8530_dma_status(struct z8530_channel *chan)
}
static struct z8530_irqhandler z8530_dma_sync = {
- z8530_dma_rx,
- z8530_dma_tx,
- z8530_dma_status
+ .rx = z8530_dma_rx,
+ .tx = z8530_dma_tx,
+ .status = z8530_dma_status,
};
static struct z8530_irqhandler z8530_txdma_sync = {
- z8530_rx,
- z8530_dma_tx,
- z8530_dma_status
+ .rx = z8530_rx,
+ .tx = z8530_dma_tx,
+ .status = z8530_dma_status,
};
/**
@@ -678,11 +677,10 @@ static void z8530_status_clear(struct z8530_channel *chan)
write_zsctrl(chan, RES_H_IUS);
}
-struct z8530_irqhandler z8530_nop=
-{
- z8530_rx_clear,
- z8530_tx_clear,
- z8530_status_clear
+struct z8530_irqhandler z8530_nop = {
+ .rx = z8530_rx_clear,
+ .tx = z8530_tx_clear,
+ .status = z8530_status_clear,
};
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index 2e0e2ea..d1f7b0d 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -27,6 +27,7 @@
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
diff --git a/scripts/gcc-plugins/randomize_layout_plugin.c b/scripts/gcc-plugins/randomize_layout_plugin.c
index cdaac8c..0073af3 100644
--- a/scripts/gcc-plugins/randomize_layout_plugin.c
+++ b/scripts/gcc-plugins/randomize_layout_plugin.c
@@ -436,9 +436,6 @@ static int is_pure_ops_struct(const_tree node)
gcc_assert(TREE_CODE(node) == RECORD_TYPE || TREE_CODE(node) == UNION_TYPE);
- /* XXX: Do not apply randomization to all-ftpr structs yet. */
- return 0;
-
for (field = TYPE_FIELDS(node); field; field = TREE_CHAIN(field)) {
const_tree fieldtype = get_field_type(field);
enum tree_code code = TREE_CODE(fieldtype);
diff --git a/scripts/gcc-plugins/structleak_plugin.c b/scripts/gcc-plugins/structleak_plugin.c
index fa3d7a4..3f8dd48 100644
--- a/scripts/gcc-plugins/structleak_plugin.c
+++ b/scripts/gcc-plugins/structleak_plugin.c
@@ -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);
}