mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Kees Cook](/assets/img/avatar_default.png)
GCC 8 changed the order of some fields and is very picky about ordering in static initializers, so instead just move to dynamic initializers, and drop the redundant already-zero field assignments. Suggested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Kees Cook <keescook@chromium.org>
628 lines
17 KiB
C
628 lines
17 KiB
C
/*
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* Copyright 2012-2016 by the PaX Team <pageexec@freemail.hu>
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* Copyright 2016 by Emese Revfy <re.emese@gmail.com>
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* Licensed under the GPL v2
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*
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* Note: the choice of the license means that the compilation process is
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* NOT 'eligible' as defined by gcc's library exception to the GPL v3,
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* but for the kernel it doesn't matter since it doesn't link against
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* any of the gcc libraries
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*
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* This gcc plugin helps generate a little bit of entropy from program state,
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* used throughout the uptime of the kernel. Here is an instrumentation example:
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*
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* before:
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* void __latent_entropy test(int argc, char *argv[])
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* {
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* if (argc <= 1)
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* printf("%s: no command arguments :(\n", *argv);
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* else
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* printf("%s: %d command arguments!\n", *argv, args - 1);
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* }
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*
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* after:
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* void __latent_entropy test(int argc, char *argv[])
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* {
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* // latent_entropy_execute() 1.
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* unsigned long local_entropy;
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* // init_local_entropy() 1.
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* void *local_entropy_frameaddr;
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* // init_local_entropy() 3.
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* unsigned long tmp_latent_entropy;
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*
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* // init_local_entropy() 2.
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* local_entropy_frameaddr = __builtin_frame_address(0);
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* local_entropy = (unsigned long) local_entropy_frameaddr;
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*
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* // init_local_entropy() 4.
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* tmp_latent_entropy = latent_entropy;
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* // init_local_entropy() 5.
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* local_entropy ^= tmp_latent_entropy;
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*
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* // latent_entropy_execute() 3.
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* if (argc <= 1) {
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* // perturb_local_entropy()
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* local_entropy += 4623067384293424948;
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* printf("%s: no command arguments :(\n", *argv);
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* // perturb_local_entropy()
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* } else {
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* local_entropy ^= 3896280633962944730;
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* printf("%s: %d command arguments!\n", *argv, args - 1);
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* }
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*
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* // latent_entropy_execute() 4.
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* tmp_latent_entropy = rol(tmp_latent_entropy, local_entropy);
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* latent_entropy = tmp_latent_entropy;
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* }
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*
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* TODO:
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* - add ipa pass to identify not explicitly marked candidate functions
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* - mix in more program state (function arguments/return values,
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* loop variables, etc)
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* - more instrumentation control via attribute parameters
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*
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* BUGS:
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* - none known
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*
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* Options:
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* -fplugin-arg-latent_entropy_plugin-disable
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*
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* Attribute: __attribute__((latent_entropy))
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* The latent_entropy gcc attribute can be only on functions and variables.
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* If it is on a function then the plugin will instrument it. If the attribute
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* is on a variable then the plugin will initialize it with a random value.
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* The variable must be an integer, an integer array type or a structure
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* with integer fields.
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*/
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#include "gcc-common.h"
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__visible int plugin_is_GPL_compatible;
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static GTY(()) tree latent_entropy_decl;
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static struct plugin_info latent_entropy_plugin_info = {
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.version = "201606141920vanilla",
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.help = "disable\tturn off latent entropy instrumentation\n",
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};
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static unsigned HOST_WIDE_INT seed;
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/*
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* get_random_seed() (this is a GCC function) generates the seed.
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* This is a simple random generator without any cryptographic security because
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* the entropy doesn't come from here.
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*/
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static unsigned HOST_WIDE_INT get_random_const(void)
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{
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unsigned int i;
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unsigned HOST_WIDE_INT ret = 0;
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for (i = 0; i < 8 * sizeof(ret); i++) {
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ret = (ret << 1) | (seed & 1);
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seed >>= 1;
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if (ret & 1)
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seed ^= 0xD800000000000000ULL;
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}
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return ret;
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}
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static tree tree_get_random_const(tree type)
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{
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unsigned long long mask;
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mask = 1ULL << (TREE_INT_CST_LOW(TYPE_SIZE(type)) - 1);
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mask = 2 * (mask - 1) + 1;
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if (TYPE_UNSIGNED(type))
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return build_int_cstu(type, mask & get_random_const());
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return build_int_cst(type, mask & get_random_const());
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}
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static tree handle_latent_entropy_attribute(tree *node, tree name,
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tree args __unused,
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int flags __unused,
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bool *no_add_attrs)
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{
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tree type;
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#if BUILDING_GCC_VERSION <= 4007
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VEC(constructor_elt, gc) *vals;
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#else
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vec<constructor_elt, va_gc> *vals;
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#endif
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switch (TREE_CODE(*node)) {
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default:
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*no_add_attrs = true;
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error("%qE attribute only applies to functions and variables",
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name);
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break;
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case VAR_DECL:
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if (DECL_INITIAL(*node)) {
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*no_add_attrs = true;
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error("variable %qD with %qE attribute must not be initialized",
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*node, name);
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break;
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}
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if (!TREE_STATIC(*node)) {
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*no_add_attrs = true;
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error("variable %qD with %qE attribute must not be local",
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*node, name);
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break;
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}
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type = TREE_TYPE(*node);
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switch (TREE_CODE(type)) {
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default:
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*no_add_attrs = true;
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error("variable %qD with %qE attribute must be an integer or a fixed length integer array type or a fixed sized structure with integer fields",
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*node, name);
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break;
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case RECORD_TYPE: {
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tree fld, lst = TYPE_FIELDS(type);
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unsigned int nelt = 0;
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for (fld = lst; fld; nelt++, fld = TREE_CHAIN(fld)) {
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tree fieldtype;
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fieldtype = TREE_TYPE(fld);
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if (TREE_CODE(fieldtype) == INTEGER_TYPE)
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continue;
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*no_add_attrs = true;
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error("structure variable %qD with %qE attribute has a non-integer field %qE",
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*node, name, fld);
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break;
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}
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if (fld)
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break;
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#if BUILDING_GCC_VERSION <= 4007
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vals = VEC_alloc(constructor_elt, gc, nelt);
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#else
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vec_alloc(vals, nelt);
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#endif
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for (fld = lst; fld; fld = TREE_CHAIN(fld)) {
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tree random_const, fld_t = TREE_TYPE(fld);
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random_const = tree_get_random_const(fld_t);
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CONSTRUCTOR_APPEND_ELT(vals, fld, random_const);
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}
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/* Initialize the fields with random constants */
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DECL_INITIAL(*node) = build_constructor(type, vals);
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break;
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}
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/* Initialize the variable with a random constant */
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case INTEGER_TYPE:
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DECL_INITIAL(*node) = tree_get_random_const(type);
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break;
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case ARRAY_TYPE: {
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tree elt_type, array_size, elt_size;
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unsigned int i, nelt;
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HOST_WIDE_INT array_size_int, elt_size_int;
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elt_type = TREE_TYPE(type);
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elt_size = TYPE_SIZE_UNIT(TREE_TYPE(type));
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array_size = TYPE_SIZE_UNIT(type);
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if (TREE_CODE(elt_type) != INTEGER_TYPE || !array_size
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|| TREE_CODE(array_size) != INTEGER_CST) {
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*no_add_attrs = true;
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error("array variable %qD with %qE attribute must be a fixed length integer array type",
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*node, name);
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break;
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}
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array_size_int = TREE_INT_CST_LOW(array_size);
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elt_size_int = TREE_INT_CST_LOW(elt_size);
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nelt = array_size_int / elt_size_int;
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#if BUILDING_GCC_VERSION <= 4007
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vals = VEC_alloc(constructor_elt, gc, nelt);
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#else
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vec_alloc(vals, nelt);
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#endif
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for (i = 0; i < nelt; i++) {
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tree cst = size_int(i);
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tree rand_cst = tree_get_random_const(elt_type);
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CONSTRUCTOR_APPEND_ELT(vals, cst, rand_cst);
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}
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/*
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* Initialize the elements of the array with random
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* constants
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*/
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DECL_INITIAL(*node) = build_constructor(type, vals);
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break;
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}
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}
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break;
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case FUNCTION_DECL:
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break;
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}
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return NULL_TREE;
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}
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static struct attribute_spec latent_entropy_attr = { };
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static void register_attributes(void *event_data __unused, void *data __unused)
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{
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latent_entropy_attr.name = "latent_entropy";
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latent_entropy_attr.decl_required = true;
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latent_entropy_attr.handler = handle_latent_entropy_attribute;
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register_attribute(&latent_entropy_attr);
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}
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static bool latent_entropy_gate(void)
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{
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tree list;
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/* don't bother with noreturn functions for now */
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if (TREE_THIS_VOLATILE(current_function_decl))
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return false;
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/* gcc-4.5 doesn't discover some trivial noreturn functions */
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if (EDGE_COUNT(EXIT_BLOCK_PTR_FOR_FN(cfun)->preds) == 0)
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return false;
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list = DECL_ATTRIBUTES(current_function_decl);
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return lookup_attribute("latent_entropy", list) != NULL_TREE;
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}
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static tree create_var(tree type, const char *name)
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{
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tree var;
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var = create_tmp_var(type, name);
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add_referenced_var(var);
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mark_sym_for_renaming(var);
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return var;
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}
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/*
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* Set up the next operation and its constant operand to use in the latent
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* entropy PRNG. When RHS is specified, the request is for perturbing the
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* local latent entropy variable, otherwise it is for perturbing the global
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* latent entropy variable where the two operands are already given by the
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* local and global latent entropy variables themselves.
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*
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* The operation is one of add/xor/rol when instrumenting the local entropy
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* variable and one of add/xor when perturbing the global entropy variable.
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* Rotation is not used for the latter case because it would transmit less
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* entropy to the global variable than the other two operations.
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*/
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static enum tree_code get_op(tree *rhs)
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{
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static enum tree_code op;
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unsigned HOST_WIDE_INT random_const;
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random_const = get_random_const();
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switch (op) {
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case BIT_XOR_EXPR:
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op = PLUS_EXPR;
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break;
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case PLUS_EXPR:
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if (rhs) {
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op = LROTATE_EXPR;
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/*
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* This code limits the value of random_const to
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* the size of a long for the rotation
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*/
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random_const %= TYPE_PRECISION(long_unsigned_type_node);
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break;
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}
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case LROTATE_EXPR:
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default:
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op = BIT_XOR_EXPR;
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break;
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}
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if (rhs)
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*rhs = build_int_cstu(long_unsigned_type_node, random_const);
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return op;
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}
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static gimple create_assign(enum tree_code code, tree lhs, tree op1,
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tree op2)
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{
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return gimple_build_assign_with_ops(code, lhs, op1, op2);
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}
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static void perturb_local_entropy(basic_block bb, tree local_entropy)
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{
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gimple_stmt_iterator gsi;
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gimple assign;
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tree rhs;
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enum tree_code op;
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op = get_op(&rhs);
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assign = create_assign(op, local_entropy, local_entropy, rhs);
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gsi = gsi_after_labels(bb);
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gsi_insert_before(&gsi, assign, GSI_NEW_STMT);
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update_stmt(assign);
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}
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static void __perturb_latent_entropy(gimple_stmt_iterator *gsi,
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tree local_entropy)
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{
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gimple assign;
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tree temp;
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enum tree_code op;
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/* 1. create temporary copy of latent_entropy */
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temp = create_var(long_unsigned_type_node, "temp_latent_entropy");
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/* 2. read... */
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add_referenced_var(latent_entropy_decl);
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mark_sym_for_renaming(latent_entropy_decl);
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assign = gimple_build_assign(temp, latent_entropy_decl);
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gsi_insert_before(gsi, assign, GSI_NEW_STMT);
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update_stmt(assign);
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/* 3. ...modify... */
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op = get_op(NULL);
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assign = create_assign(op, temp, temp, local_entropy);
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gsi_insert_after(gsi, assign, GSI_NEW_STMT);
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update_stmt(assign);
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/* 4. ...write latent_entropy */
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assign = gimple_build_assign(latent_entropy_decl, temp);
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gsi_insert_after(gsi, assign, GSI_NEW_STMT);
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update_stmt(assign);
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}
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static bool handle_tail_calls(basic_block bb, tree local_entropy)
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{
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gimple_stmt_iterator gsi;
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for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) {
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gcall *call;
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gimple stmt = gsi_stmt(gsi);
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if (!is_gimple_call(stmt))
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continue;
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call = as_a_gcall(stmt);
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if (!gimple_call_tail_p(call))
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continue;
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__perturb_latent_entropy(&gsi, local_entropy);
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return true;
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}
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return false;
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}
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static void perturb_latent_entropy(tree local_entropy)
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{
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edge_iterator ei;
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edge e, last_bb_e;
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basic_block last_bb;
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gcc_assert(single_pred_p(EXIT_BLOCK_PTR_FOR_FN(cfun)));
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last_bb_e = single_pred_edge(EXIT_BLOCK_PTR_FOR_FN(cfun));
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FOR_EACH_EDGE(e, ei, last_bb_e->src->preds) {
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if (ENTRY_BLOCK_PTR_FOR_FN(cfun) == e->src)
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continue;
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if (EXIT_BLOCK_PTR_FOR_FN(cfun) == e->src)
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continue;
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handle_tail_calls(e->src, local_entropy);
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}
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last_bb = single_pred(EXIT_BLOCK_PTR_FOR_FN(cfun));
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if (!handle_tail_calls(last_bb, local_entropy)) {
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gimple_stmt_iterator gsi = gsi_last_bb(last_bb);
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__perturb_latent_entropy(&gsi, local_entropy);
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}
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}
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static void init_local_entropy(basic_block bb, tree local_entropy)
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{
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gimple assign, call;
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tree frame_addr, rand_const, tmp, fndecl, udi_frame_addr;
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enum tree_code op;
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unsigned HOST_WIDE_INT rand_cst;
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gimple_stmt_iterator gsi = gsi_after_labels(bb);
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/* 1. create local_entropy_frameaddr */
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frame_addr = create_var(ptr_type_node, "local_entropy_frameaddr");
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/* 2. local_entropy_frameaddr = __builtin_frame_address() */
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fndecl = builtin_decl_implicit(BUILT_IN_FRAME_ADDRESS);
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call = gimple_build_call(fndecl, 1, integer_zero_node);
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gimple_call_set_lhs(call, frame_addr);
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gsi_insert_before(&gsi, call, GSI_NEW_STMT);
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update_stmt(call);
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udi_frame_addr = fold_convert(long_unsigned_type_node, frame_addr);
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assign = gimple_build_assign(local_entropy, udi_frame_addr);
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gsi_insert_after(&gsi, assign, GSI_NEW_STMT);
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update_stmt(assign);
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/* 3. create temporary copy of latent_entropy */
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tmp = create_var(long_unsigned_type_node, "temp_latent_entropy");
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/* 4. read the global entropy variable into local entropy */
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add_referenced_var(latent_entropy_decl);
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mark_sym_for_renaming(latent_entropy_decl);
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assign = gimple_build_assign(tmp, latent_entropy_decl);
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gsi_insert_after(&gsi, assign, GSI_NEW_STMT);
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update_stmt(assign);
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/* 5. mix local_entropy_frameaddr into local entropy */
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assign = create_assign(BIT_XOR_EXPR, local_entropy, local_entropy, tmp);
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gsi_insert_after(&gsi, assign, GSI_NEW_STMT);
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update_stmt(assign);
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rand_cst = get_random_const();
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rand_const = build_int_cstu(long_unsigned_type_node, rand_cst);
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op = get_op(NULL);
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assign = create_assign(op, local_entropy, local_entropy, rand_const);
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gsi_insert_after(&gsi, assign, GSI_NEW_STMT);
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update_stmt(assign);
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}
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static bool create_latent_entropy_decl(void)
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{
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varpool_node_ptr node;
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if (latent_entropy_decl != NULL_TREE)
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return true;
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FOR_EACH_VARIABLE(node) {
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tree name, var = NODE_DECL(node);
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if (DECL_NAME_LENGTH(var) < sizeof("latent_entropy") - 1)
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continue;
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name = DECL_NAME(var);
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if (strcmp(IDENTIFIER_POINTER(name), "latent_entropy"))
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continue;
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latent_entropy_decl = var;
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break;
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}
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|
return latent_entropy_decl != NULL_TREE;
|
|
}
|
|
|
|
static unsigned int latent_entropy_execute(void)
|
|
{
|
|
basic_block bb;
|
|
tree local_entropy;
|
|
|
|
if (!create_latent_entropy_decl())
|
|
return 0;
|
|
|
|
/* prepare for step 2 below */
|
|
gcc_assert(single_succ_p(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
|
|
bb = single_succ(ENTRY_BLOCK_PTR_FOR_FN(cfun));
|
|
if (!single_pred_p(bb)) {
|
|
split_edge(single_succ_edge(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
|
|
gcc_assert(single_succ_p(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
|
|
bb = single_succ(ENTRY_BLOCK_PTR_FOR_FN(cfun));
|
|
}
|
|
|
|
/* 1. create the local entropy variable */
|
|
local_entropy = create_var(long_unsigned_type_node, "local_entropy");
|
|
|
|
/* 2. initialize the local entropy variable */
|
|
init_local_entropy(bb, local_entropy);
|
|
|
|
bb = bb->next_bb;
|
|
|
|
/*
|
|
* 3. instrument each BB with an operation on the
|
|
* local entropy variable
|
|
*/
|
|
while (bb != EXIT_BLOCK_PTR_FOR_FN(cfun)) {
|
|
perturb_local_entropy(bb, local_entropy);
|
|
bb = bb->next_bb;
|
|
};
|
|
|
|
/* 4. mix local entropy into the global entropy variable */
|
|
perturb_latent_entropy(local_entropy);
|
|
return 0;
|
|
}
|
|
|
|
static void latent_entropy_start_unit(void *gcc_data __unused,
|
|
void *user_data __unused)
|
|
{
|
|
tree type, id;
|
|
int quals;
|
|
|
|
seed = get_random_seed(false);
|
|
|
|
if (in_lto_p)
|
|
return;
|
|
|
|
/* extern volatile unsigned long latent_entropy */
|
|
quals = TYPE_QUALS(long_unsigned_type_node) | TYPE_QUAL_VOLATILE;
|
|
type = build_qualified_type(long_unsigned_type_node, quals);
|
|
id = get_identifier("latent_entropy");
|
|
latent_entropy_decl = build_decl(UNKNOWN_LOCATION, VAR_DECL, id, type);
|
|
|
|
TREE_STATIC(latent_entropy_decl) = 1;
|
|
TREE_PUBLIC(latent_entropy_decl) = 1;
|
|
TREE_USED(latent_entropy_decl) = 1;
|
|
DECL_PRESERVE_P(latent_entropy_decl) = 1;
|
|
TREE_THIS_VOLATILE(latent_entropy_decl) = 1;
|
|
DECL_EXTERNAL(latent_entropy_decl) = 1;
|
|
DECL_ARTIFICIAL(latent_entropy_decl) = 1;
|
|
lang_hooks.decls.pushdecl(latent_entropy_decl);
|
|
}
|
|
|
|
#define PASS_NAME latent_entropy
|
|
#define PROPERTIES_REQUIRED PROP_gimple_leh | PROP_cfg
|
|
#define TODO_FLAGS_FINISH TODO_verify_ssa | TODO_verify_stmts | TODO_dump_func \
|
|
| TODO_update_ssa
|
|
#include "gcc-generate-gimple-pass.h"
|
|
|
|
__visible int plugin_init(struct plugin_name_args *plugin_info,
|
|
struct plugin_gcc_version *version)
|
|
{
|
|
bool enabled = true;
|
|
const char * const plugin_name = plugin_info->base_name;
|
|
const int argc = plugin_info->argc;
|
|
const struct plugin_argument * const argv = plugin_info->argv;
|
|
int i;
|
|
|
|
static const struct ggc_root_tab gt_ggc_r_gt_latent_entropy[] = {
|
|
{
|
|
.base = &latent_entropy_decl,
|
|
.nelt = 1,
|
|
.stride = sizeof(latent_entropy_decl),
|
|
.cb = >_ggc_mx_tree_node,
|
|
.pchw = >_pch_nx_tree_node
|
|
},
|
|
LAST_GGC_ROOT_TAB
|
|
};
|
|
|
|
PASS_INFO(latent_entropy, "optimized", 1, PASS_POS_INSERT_BEFORE);
|
|
|
|
if (!plugin_default_version_check(version, &gcc_version)) {
|
|
error(G_("incompatible gcc/plugin versions"));
|
|
return 1;
|
|
}
|
|
|
|
for (i = 0; i < argc; ++i) {
|
|
if (!(strcmp(argv[i].key, "disable"))) {
|
|
enabled = false;
|
|
continue;
|
|
}
|
|
error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
|
|
}
|
|
|
|
register_callback(plugin_name, PLUGIN_INFO, NULL,
|
|
&latent_entropy_plugin_info);
|
|
if (enabled) {
|
|
register_callback(plugin_name, PLUGIN_START_UNIT,
|
|
&latent_entropy_start_unit, NULL);
|
|
register_callback(plugin_name, PLUGIN_REGISTER_GGC_ROOTS,
|
|
NULL, (void *)>_ggc_r_gt_latent_entropy);
|
|
register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL,
|
|
&latent_entropy_pass_info);
|
|
}
|
|
register_callback(plugin_name, PLUGIN_ATTRIBUTES, register_attributes,
|
|
NULL);
|
|
|
|
return 0;
|
|
}
|