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Date: Fri, 10 May 2019 13:23:24 -0700
From: Kees Cook <keescook@...omium.org>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: re.emese@...il.com, kernel-hardening@...ts.openwall.com,
linux-kernel@...r.kernel.org,
Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH] gcc-plugins: arm_ssp_per_task_plugin: Fix for older GCC
< 6
On Fri, May 10, 2019 at 09:00:25PM +1200, Chris Packham wrote:
> 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@...iedtelesis.co.nz>
Thanks for this! It seems correct to me. Ard, any thoughts? I can send
it to Linus next week...
Fixes: 189af4657186 ("ARM: smp: add support for per-task stack canaries")
Cc: stable@...r.kernel.org
-Kees
> ---
> scripts/gcc-plugins/arm_ssp_per_task_plugin.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/gcc-plugins/arm_ssp_per_task_plugin.c b/scripts/gcc-plugins/arm_ssp_per_task_plugin.c
> index 89c47f57d1ce..8c1af9bdcb1b 100644
> --- a/scripts/gcc-plugins/arm_ssp_per_task_plugin.c
> +++ b/scripts/gcc-plugins/arm_ssp_per_task_plugin.c
> @@ -36,7 +36,7 @@ static unsigned int arm_pertask_ssp_rtl_execute(void)
> 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,
> + emit_insn_before(gen_rtx_set(masked_sp,
> gen_rtx_AND(Pmode,
> stack_pointer_rtx,
> mask)),
> --
> 2.21.0
>
--
Kees Cook
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