forked from Minki/linux
259799ea5a
Use gen_rtx_set instead of gen_rtx_SET. The former is a wrapper macro
that handles the difference between GCC versions implementing
the latter.
This fixes the following error on my system with g++ 5.4.0 as the host
compiler
HOSTCXX -fPIC scripts/gcc-plugins/arm_ssp_per_task_plugin.o
scripts/gcc-plugins/arm_ssp_per_task_plugin.c:42:14: error: macro "gen_rtx_SET" requires 3 arguments, but only 2 given
mask)),
^
scripts/gcc-plugins/arm_ssp_per_task_plugin.c: In function ‘unsigned int arm_pertask_ssp_rtl_execute()’:
scripts/gcc-plugins/arm_ssp_per_task_plugin.c:39:20: error: ‘gen_rtx_SET’ was not declared in this scope
emit_insn_before(gen_rtx_SET
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Fixes: 189af46571 ("ARM: smp: add support for per-task stack canaries")
Cc: stable@vger.kernel.org
Tested-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include "gcc-common.h"
|
|
|
|
__visible int plugin_is_GPL_compatible;
|
|
|
|
static unsigned int sp_mask, canary_offset;
|
|
|
|
static unsigned int arm_pertask_ssp_rtl_execute(void)
|
|
{
|
|
rtx_insn *insn;
|
|
|
|
for (insn = get_insns(); insn; insn = NEXT_INSN(insn)) {
|
|
const char *sym;
|
|
rtx body;
|
|
rtx mask, masked_sp;
|
|
|
|
/*
|
|
* Find a SET insn involving a SYMBOL_REF to __stack_chk_guard
|
|
*/
|
|
if (!INSN_P(insn))
|
|
continue;
|
|
body = PATTERN(insn);
|
|
if (GET_CODE(body) != SET ||
|
|
GET_CODE(SET_SRC(body)) != SYMBOL_REF)
|
|
continue;
|
|
sym = XSTR(SET_SRC(body), 0);
|
|
if (strcmp(sym, "__stack_chk_guard"))
|
|
continue;
|
|
|
|
/*
|
|
* Replace the source of the SET insn with an expression that
|
|
* produces the address of the copy of the stack canary value
|
|
* stored in struct thread_info
|
|
*/
|
|
mask = GEN_INT(sext_hwi(sp_mask, GET_MODE_PRECISION(Pmode)));
|
|
masked_sp = gen_reg_rtx(Pmode);
|
|
|
|
emit_insn_before(gen_rtx_set(masked_sp,
|
|
gen_rtx_AND(Pmode,
|
|
stack_pointer_rtx,
|
|
mask)),
|
|
insn);
|
|
|
|
SET_SRC(body) = gen_rtx_PLUS(Pmode, masked_sp,
|
|
GEN_INT(canary_offset));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define PASS_NAME arm_pertask_ssp_rtl
|
|
|
|
#define NO_GATE
|
|
#include "gcc-generate-rtl-pass.h"
|
|
|
|
#if BUILDING_GCC_VERSION >= 9000
|
|
static bool no(void)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static void arm_pertask_ssp_start_unit(void *gcc_data, void *user_data)
|
|
{
|
|
targetm.have_stack_protect_combined_set = no;
|
|
targetm.have_stack_protect_combined_test = no;
|
|
}
|
|
#endif
|
|
|
|
__visible int plugin_init(struct plugin_name_args *plugin_info,
|
|
struct plugin_gcc_version *version)
|
|
{
|
|
const char * const plugin_name = plugin_info->base_name;
|
|
const int argc = plugin_info->argc;
|
|
const struct plugin_argument *argv = plugin_info->argv;
|
|
int tso = 0;
|
|
int i;
|
|
|
|
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"))
|
|
return 0;
|
|
|
|
/* all remaining options require a value */
|
|
if (!argv[i].value) {
|
|
error(G_("no value supplied for option '-fplugin-arg-%s-%s'"),
|
|
plugin_name, argv[i].key);
|
|
return 1;
|
|
}
|
|
|
|
if (!strcmp(argv[i].key, "tso")) {
|
|
tso = atoi(argv[i].value);
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(argv[i].key, "offset")) {
|
|
canary_offset = atoi(argv[i].value);
|
|
continue;
|
|
}
|
|
error(G_("unknown option '-fplugin-arg-%s-%s'"),
|
|
plugin_name, argv[i].key);
|
|
return 1;
|
|
}
|
|
|
|
/* create the mask that produces the base of the stack */
|
|
sp_mask = ~((1U << (12 + tso)) - 1);
|
|
|
|
PASS_INFO(arm_pertask_ssp_rtl, "expand", 1, PASS_POS_INSERT_AFTER);
|
|
|
|
register_callback(plugin_info->base_name, PLUGIN_PASS_MANAGER_SETUP,
|
|
NULL, &arm_pertask_ssp_rtl_pass_info);
|
|
|
|
#if BUILDING_GCC_VERSION >= 9000
|
|
register_callback(plugin_info->base_name, PLUGIN_START_UNIT,
|
|
arm_pertask_ssp_start_unit, NULL);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|