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- make sure required exports from gcc plugins are visible to gcc

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- switch latent_entropy to unsigned long to avoid stack frame bloat
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 Version: GnuPG v1
 Comment: Kees Cook <kees@outflux.net>
 
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Merge tag 'gcc-plugins-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull gcc plugin fixes from Kees Cook:
 - make sure required exports from gcc plugins are visible to gcc
 - switch latent_entropy to unsigned long to avoid stack frame bloat

* tag 'gcc-plugins-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  latent_entropy: Fix wrong gcc code generation with 64 bit variables
  gcc-plugins: Export symbols needed by gcc
This commit is contained in:
Linus Torvalds 2016-11-01 17:48:46 -06:00
commit 577f12c07e
5 changed files with 18 additions and 18 deletions
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2
mm/page_alloc.c
View File

@ -92,7 +92,7 @@ int _node_numa_mem_[MAX_NUMNODES];
#endif
#ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY
volatile u64 latent_entropy __latent_entropy;
volatile unsigned long latent_entropy __latent_entropy;
EXPORT_SYMBOL(latent_entropy);
#endif

4
scripts/gcc-plugins/cyc_complexity_plugin.c
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@ -20,7 +20,7 @@
#include "gcc-common.h"
int plugin_is_GPL_compatible;
__visible int plugin_is_GPL_compatible;
static struct plugin_info cyc_complexity_plugin_info = {
.version = "20160225",
@ -49,7 +49,7 @@ static unsigned int cyc_complexity_execute(void)
#include "gcc-generate-gimple-pass.h"
int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
{
const char * const plugin_name = plugin_info->base_name;
struct register_pass_info cyc_complexity_pass_info;

1
scripts/gcc-plugins/gcc-common.h
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@ -130,6 +130,7 @@ extern void dump_gimple_stmt(pretty_printer *, gimple, int, int);
#endif
#define __unused __attribute__((__unused__))
#define __visible __attribute__((visibility("default")))
#define DECL_NAME_POINTER(node) IDENTIFIER_POINTER(DECL_NAME(node))
#define DECL_NAME_LENGTH(node) IDENTIFIER_LENGTH(DECL_NAME(node))

25
scripts/gcc-plugins/latent_entropy_plugin.c
View File

@ -77,7 +77,7 @@
#include "gcc-common.h"
int plugin_is_GPL_compatible;
__visible int plugin_is_GPL_compatible;
static GTY(()) tree latent_entropy_decl;
@ -340,7 +340,7 @@ static enum tree_code get_op(tree *rhs)
break;
}
if (rhs)
*rhs = build_int_cstu(unsigned_intDI_type_node, random_const);
*rhs = build_int_cstu(long_unsigned_type_node, random_const);
return op;
}
@ -372,7 +372,7 @@ static void __perturb_latent_entropy(gimple_stmt_iterator *gsi,
enum tree_code op;
/* 1. create temporary copy of latent_entropy */
temp = create_var(unsigned_intDI_type_node, "tmp_latent_entropy");
temp = create_var(long_unsigned_type_node, "temp_latent_entropy");
/* 2. read... */
add_referenced_var(latent_entropy_decl);
@ -459,13 +459,13 @@ static void init_local_entropy(basic_block bb, tree local_entropy)
gsi_insert_before(&gsi, call, GSI_NEW_STMT);
update_stmt(call);
udi_frame_addr = fold_convert(unsigned_intDI_type_node, frame_addr);
udi_frame_addr = fold_convert(long_unsigned_type_node, frame_addr);
assign = gimple_build_assign(local_entropy, udi_frame_addr);
gsi_insert_after(&gsi, assign, GSI_NEW_STMT);
update_stmt(assign);
/* 3. create temporary copy of latent_entropy */
tmp = create_var(unsigned_intDI_type_node, "tmp_latent_entropy");
tmp = create_var(long_unsigned_type_node, "temp_latent_entropy");
/* 4. read the global entropy variable into local entropy */
add_referenced_var(latent_entropy_decl);
@ -480,7 +480,7 @@ static void init_local_entropy(basic_block bb, tree local_entropy)
update_stmt(assign);
rand_cst = get_random_const();
rand_const = build_int_cstu(unsigned_intDI_type_node, rand_cst);
rand_const = build_int_cstu(long_unsigned_type_node, rand_cst);
op = get_op(NULL);
assign = create_assign(op, local_entropy, local_entropy, rand_const);
gsi_insert_after(&gsi, assign, GSI_NEW_STMT);
@ -529,7 +529,7 @@ static unsigned int latent_entropy_execute(void)
}
/* 1. create the local entropy variable */
local_entropy = create_var(unsigned_intDI_type_node, "local_entropy");
local_entropy = create_var(long_unsigned_type_node, "local_entropy");
/* 2. initialize the local entropy variable */
init_local_entropy(bb, local_entropy);
@ -561,10 +561,9 @@ static void latent_entropy_start_unit(void *gcc_data __unused,
if (in_lto_p)
return;
/* extern volatile u64 latent_entropy */
gcc_assert(TYPE_PRECISION(long_long_unsigned_type_node) == 64);
quals = TYPE_QUALS(long_long_unsigned_type_node) | TYPE_QUAL_VOLATILE;
type = build_qualified_type(long_long_unsigned_type_node, quals);
/* 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);
@ -584,8 +583,8 @@ static void latent_entropy_start_unit(void *gcc_data __unused,
| TODO_update_ssa
#include "gcc-generate-gimple-pass.h"
int plugin_init(struct plugin_name_args *plugin_info,
struct plugin_gcc_version *version)
__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;

4
scripts/gcc-plugins/sancov_plugin.c
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@ -21,7 +21,7 @@
#include "gcc-common.h"
int plugin_is_GPL_compatible;
__visible int plugin_is_GPL_compatible;
tree sancov_fndecl;
@ -86,7 +86,7 @@ static void sancov_start_unit(void __unused *gcc_data, void __unused *user_data)
#endif
}
int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
{
int i;
struct register_pass_info sancov_plugin_pass_info;