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From: Laszlo Ersek <lersek@redhat.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>, edk2-devel@lists.01.org
Cc: yonghong.zhu@intel.com, liming.gao@intel.com,
	steven.shi@intel.com, zenith432@users.sourceforge.net
Subject: Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly
Date: Mon, 11 Jun 2018 11:13:34 +0200	[thread overview]
Message-ID: <e24797af-bf11-519b-a51a-50038e96d570@redhat.com> (raw)
In-Reply-To: <20180611074227.30625-1-ard.biesheuvel@linaro.org>

On 06/11/18 09:42, Ard Biesheuvel wrote:
> As a security measure, some distros now build their GCC toolchains with
> PIE code generation enabled by default, because it is a prerequisite
> for ASLR to be enabled when running the executable.
> 
> This typically results in slightly larger code, but it also generates
> ELF relocations that our tooling cannot deal with, so let's disable it
> explicitly when using GCC5 for IA32. (Note that this does not apply to
> X64: it uses PIE code deliberately in some cases, and our tooling does
> deal with the resuling relocations)
> 
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  BaseTools/Conf/tools_def.template | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
> index 7e9c915755ed..ab57f9c706e3 100755
> --- a/BaseTools/Conf/tools_def.template
> +++ b/BaseTools/Conf/tools_def.template
> @@ -4670,7 +4670,7 @@ DEFINE GCC49_AARCH64_DLINK2_FLAGS    = DEF(GCC48_AARCH64_DLINK2_FLAGS)
>  DEFINE GCC49_ARM_ASLDLINK_FLAGS      = DEF(GCC48_ARM_ASLDLINK_FLAGS)
>  DEFINE GCC49_AARCH64_ASLDLINK_FLAGS  = DEF(GCC48_AARCH64_ASLDLINK_FLAGS)
>  
> -DEFINE GCC5_IA32_CC_FLAGS            = DEF(GCC49_IA32_CC_FLAGS)
> +DEFINE GCC5_IA32_CC_FLAGS            = DEF(GCC49_IA32_CC_FLAGS) -fno-pic -fno-pie
>  DEFINE GCC5_X64_CC_FLAGS             = DEF(GCC49_X64_CC_FLAGS)
>  DEFINE GCC5_IA32_X64_DLINK_COMMON    = DEF(GCC49_IA32_X64_DLINK_COMMON)
>  DEFINE GCC5_IA32_X64_ASLDLINK_FLAGS  = DEF(GCC49_IA32_X64_ASLDLINK_FLAGS)
> @@ -5502,9 +5502,9 @@ RELEASE_GCC49_AARCH64_DLINK_FLAGS  = DEF(GCC49_AARCH64_DLINK_FLAGS)
>  *_GCC5_IA32_RC_PATH              = DEF(GCC5_IA32_PREFIX)objcopy
>  
>  *_GCC5_IA32_ASLCC_FLAGS          = DEF(GCC_ASLCC_FLAGS) -m32 -fno-lto
> -*_GCC5_IA32_ASLDLINK_FLAGS       = DEF(GCC5_IA32_X64_ASLDLINK_FLAGS) -Wl,-m,elf_i386
> +*_GCC5_IA32_ASLDLINK_FLAGS       = DEF(GCC5_IA32_X64_ASLDLINK_FLAGS) -Wl,-m,elf_i386 -no-pie
>  *_GCC5_IA32_ASM_FLAGS            = DEF(GCC5_ASM_FLAGS) -m32 -march=i386
> -*_GCC5_IA32_DLINK2_FLAGS         = DEF(GCC5_IA32_DLINK2_FLAGS)
> +*_GCC5_IA32_DLINK2_FLAGS         = DEF(GCC5_IA32_DLINK2_FLAGS) -no-pie
>  *_GCC5_IA32_RC_FLAGS             = DEF(GCC_IA32_RC_FLAGS)
>  *_GCC5_IA32_OBJCOPY_FLAGS        =
>  *_GCC5_IA32_NASM_FLAGS           = -f elf32
> 

Acked-by: Laszlo Ersek <lersek@redhat.com>


      parent reply	other threads:[~2018-06-11  9:13 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-11  7:42 [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly Ard Biesheuvel
2018-06-11  8:38 ` Gao, Liming
2018-06-11  8:52   ` Ard Biesheuvel
2018-06-11  8:53     ` Ard Biesheuvel
2018-06-11 16:00     ` Gao, Liming
2018-06-11 16:03       ` Ard Biesheuvel
2018-06-11 16:09         ` Gao, Liming
2018-06-11 16:25           ` Ard Biesheuvel
2018-06-11  9:13 ` Laszlo Ersek [this message]

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