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Bug fixes for gcc-plugins

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- Fix ARM per-task stack protector plugin under GCC 9 (Ard Biesheuvel)
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 Comment: Kees Cook <kees@outflux.net>
 
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Merge tag 'gcc-plugins-v5.0-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull gcc-plugins fixes from Kees Cook:
 "Fix ARM per-task stack protector plugin under GCC 9 (Ard Biesheuvel)"

* tag 'gcc-plugins-v5.0-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  gcc-plugins: arm_ssp_per_task_plugin: fix for GCC 9+
  gcc-plugins: arm_ssp_per_task_plugin: sign extend the SP mask
This commit is contained in:
Linus Torvalds 2019-01-21 13:07:03 +13:00
commit dbcfc96193
1 changed files with 21 additions and 2 deletions
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23
scripts/gcc-plugins/arm_ssp_per_task_plugin.c
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@ -13,7 +13,7 @@ static unsigned int arm_pertask_ssp_rtl_execute(void)
for (insn = get_insns(); insn; insn = NEXT_INSN(insn)) {
const char *sym;
rtx body;
rtx masked_sp;
rtx mask, masked_sp;
/*
* Find a SET insn involving a SYMBOL_REF to __stack_chk_guard
@ -33,12 +33,13 @@ static unsigned int arm_pertask_ssp_rtl_execute(void)
* 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,
GEN_INT(sp_mask))),
mask)),
insn);
SET_SRC(body) = gen_rtx_PLUS(Pmode, masked_sp,
@ -52,6 +53,19 @@ static unsigned int arm_pertask_ssp_rtl_execute(void)
#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)
{
@ -99,5 +113,10 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
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;
}