* [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly @ 2018-06-11 7:42 Ard Biesheuvel 2018-06-11 8:38 ` Gao, Liming 2018-06-11 9:13 ` Laszlo Ersek 0 siblings, 2 replies; 9+ messages in thread From: Ard Biesheuvel @ 2018-06-11 7:42 UTC (permalink / raw) To: edk2-devel Cc: yonghong.zhu, liming.gao, lersek, steven.shi, zenith432, Ard Biesheuvel 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 -- 2.17.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly 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 9:13 ` Laszlo Ersek 1 sibling, 1 reply; 9+ messages in thread From: Gao, Liming @ 2018-06-11 8:38 UTC (permalink / raw) To: Ard Biesheuvel, edk2-devel@lists.01.org Cc: Zhu, Yonghong, lersek@redhat.com, Shi, Steven, zenith432@users.sourceforge.net, Gao, Liming Ard: Do you mean the default GCC compiler disables PIC and PIE for IA32 arch? But now, some distribution GCC compiler enables PIC and PIE by default. So, we have to obviously disable PIC and PIE in tools_def.txt. Thanks Liming >-----Original Message----- >From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] >Sent: Monday, June 11, 2018 3:42 PM >To: edk2-devel@lists.01.org >Cc: Zhu, Yonghong <yonghong.zhu@intel.com>; Gao, Liming ><liming.gao@intel.com>; lersek@redhat.com; Shi, Steven ><steven.shi@intel.com>; zenith432@users.sourceforge.net; Ard Biesheuvel ><ard.biesheuvel@linaro.org> >Subject: [PATCH] BaseTools/tools_def IA32: disable PIE code generation >explicitly > >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 >-- >2.17.1 ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly 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 0 siblings, 2 replies; 9+ messages in thread From: Ard Biesheuvel @ 2018-06-11 8:52 UTC (permalink / raw) To: Gao, Liming Cc: edk2-devel@lists.01.org, Zhu, Yonghong, lersek@redhat.com, Shi, Steven, zenith432@users.sourceforge.net On 11 June 2018 at 10:38, Gao, Liming <liming.gao@intel.com> wrote: > Ard: > Do you mean the default GCC compiler disables PIC and PIE for IA32 arch? But now, some distribution GCC compiler enables PIC and PIE by default. So, we have to obviously disable PIC and PIE in tools_def.txt. > Yes. On my x86 Ubuntu 18.04 LTS system: $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.3.0-16ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --with-as=/usr/bin/x86_64-linux-gnu-as --with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3) Notice the '--enable-default-pie' 4 lines from the bottom. >>-----Original Message----- >>From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] >>Sent: Monday, June 11, 2018 3:42 PM >>To: edk2-devel@lists.01.org >>Cc: Zhu, Yonghong <yonghong.zhu@intel.com>; Gao, Liming >><liming.gao@intel.com>; lersek@redhat.com; Shi, Steven >><steven.shi@intel.com>; zenith432@users.sourceforge.net; Ard Biesheuvel >><ard.biesheuvel@linaro.org> >>Subject: [PATCH] BaseTools/tools_def IA32: disable PIE code generation >>explicitly >> >>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 >>-- >>2.17.1 > ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly 2018-06-11 8:52 ` Ard Biesheuvel @ 2018-06-11 8:53 ` Ard Biesheuvel 2018-06-11 16:00 ` Gao, Liming 1 sibling, 0 replies; 9+ messages in thread From: Ard Biesheuvel @ 2018-06-11 8:53 UTC (permalink / raw) To: Gao, Liming Cc: edk2-devel@lists.01.org, Zhu, Yonghong, lersek@redhat.com, Shi, Steven, zenith432@users.sourceforge.net On 11 June 2018 at 10:52, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote: > On 11 June 2018 at 10:38, Gao, Liming <liming.gao@intel.com> wrote: >> Ard: >> Do you mean the default GCC compiler disables PIC and PIE for IA32 arch? But now, some distribution GCC compiler enables PIC and PIE by default. So, we have to obviously disable PIC and PIE in tools_def.txt. >> > > Yes. On my x86 Ubuntu 18.04 LTS system: > > $ gcc -v > Using built-in specs. > COLLECT_GCC=gcc > COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper > OFFLOAD_TARGET_NAMES=nvptx-none > OFFLOAD_TARGET_DEFAULT=1 > Target: x86_64-linux-gnu > Configured with: ../src/configure -v --with-pkgversion='Ubuntu > 7.3.0-16ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs > --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ > --prefix=/usr --with-gcc-major-version-only > --with-as=/usr/bin/x86_64-linux-gnu-as > --with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7 > --program-prefix=x86_64-linux-gnu- --enable-shared > --enable-linker-build-id --libexecdir=/usr/lib > --without-included-gettext --enable-threads=posix --libdir=/usr/lib > --enable-nls --with-sysroot=/ --enable-clocale=gnu > --enable-libstdcxx-debug --enable-libstdcxx-time=yes > --with-default-libstdcxx-abi=new --enable-gnu-unique-object > --disable-vtable-verify --enable-libmpx --enable-plugin > --enable-default-pie --with-system-zlib --with-target-system-zlib > --enable-objc-gc=auto --enable-multiarch --disable-werror > --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 > --enable-multilib --with-tune=generic > --enable-offload-targets=nvptx-none --without-cuda-driver > --enable-checking=release --build=x86_64-linux-gnu > --host=x86_64-linux-gnu --target=x86_64-linux-gnu > Thread model: posix > gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3) > > > Notice the '--enable-default-pie' 4 lines from the bottom. > (or 9 lines after the mail was rewrapped by gmail) ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly 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 1 sibling, 1 reply; 9+ messages in thread From: Gao, Liming @ 2018-06-11 16:00 UTC (permalink / raw) To: Ard Biesheuvel Cc: edk2-devel@lists.01.org, lersek@redhat.com, zenith432@users.sourceforge.net Ard: Is this option required in GCC49 tool chain? Or, this option is only required when lto is enabled? Thanks Liming > -----Original Message----- > From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ard Biesheuvel > Sent: Monday, June 11, 2018 4:53 PM > To: Gao, Liming <liming.gao@intel.com> > Cc: edk2-devel@lists.01.org; lersek@redhat.com; zenith432@users.sourceforge.net > Subject: Re: [edk2] [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly > > On 11 June 2018 at 10:38, Gao, Liming <liming.gao@intel.com> wrote: > > Ard: > > Do you mean the default GCC compiler disables PIC and PIE for IA32 arch? But now, some distribution GCC compiler enables PIC > and PIE by default. So, we have to obviously disable PIC and PIE in tools_def.txt. > > > > Yes. On my x86 Ubuntu 18.04 LTS system: > > $ gcc -v > Using built-in specs. > COLLECT_GCC=gcc > COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper > OFFLOAD_TARGET_NAMES=nvptx-none > OFFLOAD_TARGET_DEFAULT=1 > Target: x86_64-linux-gnu > Configured with: ../src/configure -v --with-pkgversion='Ubuntu > 7.3.0-16ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs > --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ > --prefix=/usr --with-gcc-major-version-only > --with-as=/usr/bin/x86_64-linux-gnu-as > --with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7 > --program-prefix=x86_64-linux-gnu- --enable-shared > --enable-linker-build-id --libexecdir=/usr/lib > --without-included-gettext --enable-threads=posix --libdir=/usr/lib > --enable-nls --with-sysroot=/ --enable-clocale=gnu > --enable-libstdcxx-debug --enable-libstdcxx-time=yes > --with-default-libstdcxx-abi=new --enable-gnu-unique-object > --disable-vtable-verify --enable-libmpx --enable-plugin > --enable-default-pie --with-system-zlib --with-target-system-zlib > --enable-objc-gc=auto --enable-multiarch --disable-werror > --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 > --enable-multilib --with-tune=generic > --enable-offload-targets=nvptx-none --without-cuda-driver > --enable-checking=release --build=x86_64-linux-gnu > --host=x86_64-linux-gnu --target=x86_64-linux-gnu > Thread model: posix > gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3) > > > Notice the '--enable-default-pie' 4 lines from the bottom. > > > > >>-----Original Message----- > >>From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] > >>Sent: Monday, June 11, 2018 3:42 PM > >>To: edk2-devel@lists.01.org > >>Cc: Zhu, Yonghong <yonghong.zhu@intel.com>; Gao, Liming > >><liming.gao@intel.com>; lersek@redhat.com; Shi, Steven > >><steven.shi@intel.com>; zenith432@users.sourceforge.net; Ard Biesheuvel > >><ard.biesheuvel@linaro.org> > >>Subject: [PATCH] BaseTools/tools_def IA32: disable PIE code generation > >>explicitly > >> > >>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 > >>-- > >>2.17.1 > > > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.01.org > https://lists.01.org/mailman/listinfo/edk2-devel ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly 2018-06-11 16:00 ` Gao, Liming @ 2018-06-11 16:03 ` Ard Biesheuvel 2018-06-11 16:09 ` Gao, Liming 0 siblings, 1 reply; 9+ messages in thread From: Ard Biesheuvel @ 2018-06-11 16:03 UTC (permalink / raw) To: Gao, Liming Cc: edk2-devel@lists.01.org, lersek@redhat.com, zenith432@users.sourceforge.net On 11 June 2018 at 18:00, Gao, Liming <liming.gao@intel.com> wrote: > Ard: > Is this option required in GCC49 tool chain? Or, this option is only required when lto is enabled? > It has nothing to do with LTO. In theory, it could be required for any toolchain that supports -fpic and or -fpie. However, not all 4.x toolchains support -fpie and so they don't support -fno-pie either. Given that the distros only changed this default recently (in the 5.x timeframe or later), it makes sense to only disable it for GCC5, although it is safe to disable it for GCC49 as well. >> -----Original Message----- >> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ard Biesheuvel >> Sent: Monday, June 11, 2018 4:53 PM >> To: Gao, Liming <liming.gao@intel.com> >> Cc: edk2-devel@lists.01.org; lersek@redhat.com; zenith432@users.sourceforge.net >> Subject: Re: [edk2] [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly >> >> On 11 June 2018 at 10:38, Gao, Liming <liming.gao@intel.com> wrote: >> > Ard: >> > Do you mean the default GCC compiler disables PIC and PIE for IA32 arch? But now, some distribution GCC compiler enables PIC >> and PIE by default. So, we have to obviously disable PIC and PIE in tools_def.txt. >> > >> >> Yes. On my x86 Ubuntu 18.04 LTS system: >> >> $ gcc -v >> Using built-in specs. >> COLLECT_GCC=gcc >> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper >> OFFLOAD_TARGET_NAMES=nvptx-none >> OFFLOAD_TARGET_DEFAULT=1 >> Target: x86_64-linux-gnu >> Configured with: ../src/configure -v --with-pkgversion='Ubuntu >> 7.3.0-16ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs >> --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ >> --prefix=/usr --with-gcc-major-version-only >> --with-as=/usr/bin/x86_64-linux-gnu-as >> --with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7 >> --program-prefix=x86_64-linux-gnu- --enable-shared >> --enable-linker-build-id --libexecdir=/usr/lib >> --without-included-gettext --enable-threads=posix --libdir=/usr/lib >> --enable-nls --with-sysroot=/ --enable-clocale=gnu >> --enable-libstdcxx-debug --enable-libstdcxx-time=yes >> --with-default-libstdcxx-abi=new --enable-gnu-unique-object >> --disable-vtable-verify --enable-libmpx --enable-plugin >> --enable-default-pie --with-system-zlib --with-target-system-zlib >> --enable-objc-gc=auto --enable-multiarch --disable-werror >> --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 >> --enable-multilib --with-tune=generic >> --enable-offload-targets=nvptx-none --without-cuda-driver >> --enable-checking=release --build=x86_64-linux-gnu >> --host=x86_64-linux-gnu --target=x86_64-linux-gnu >> Thread model: posix >> gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3) >> >> >> Notice the '--enable-default-pie' 4 lines from the bottom. >> >> >> >> >>-----Original Message----- >> >>From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] >> >>Sent: Monday, June 11, 2018 3:42 PM >> >>To: edk2-devel@lists.01.org >> >>Cc: Zhu, Yonghong <yonghong.zhu@intel.com>; Gao, Liming >> >><liming.gao@intel.com>; lersek@redhat.com; Shi, Steven >> >><steven.shi@intel.com>; zenith432@users.sourceforge.net; Ard Biesheuvel >> >><ard.biesheuvel@linaro.org> >> >>Subject: [PATCH] BaseTools/tools_def IA32: disable PIE code generation >> >>explicitly >> >> >> >>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 >> >>-- >> >>2.17.1 >> > >> _______________________________________________ >> edk2-devel mailing list >> edk2-devel@lists.01.org >> https://lists.01.org/mailman/listinfo/edk2-devel ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly 2018-06-11 16:03 ` Ard Biesheuvel @ 2018-06-11 16:09 ` Gao, Liming 2018-06-11 16:25 ` Ard Biesheuvel 0 siblings, 1 reply; 9+ messages in thread From: Gao, Liming @ 2018-06-11 16:09 UTC (permalink / raw) To: Ard Biesheuvel Cc: edk2-devel@lists.01.org, lersek@redhat.com, zenith432@users.sourceforge.net Ard: GCC49 tool chain can be used by GCC4.9 and above compiler. It provides the GCC setting without LTO. GCC5 tool chain provides GCC setting with LTO. So, I suggest to disable it also in GCC49 tool chain. Thanks Liming > -----Original Message----- > From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] > Sent: Tuesday, June 12, 2018 12:04 AM > To: Gao, Liming <liming.gao@intel.com> > Cc: edk2-devel@lists.01.org; lersek@redhat.com; zenith432@users.sourceforge.net > Subject: Re: [edk2] [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly > > On 11 June 2018 at 18:00, Gao, Liming <liming.gao@intel.com> wrote: > > Ard: > > Is this option required in GCC49 tool chain? Or, this option is only required when lto is enabled? > > > > It has nothing to do with LTO. > > In theory, it could be required for any toolchain that supports -fpic > and or -fpie. However, not all 4.x toolchains support -fpie and so > they don't support -fno-pie either. > > Given that the distros only changed this default recently (in the 5.x > timeframe or later), it makes sense to only disable it for GCC5, > although it is safe to disable it for GCC49 as well. > > >> -----Original Message----- > >> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ard Biesheuvel > >> Sent: Monday, June 11, 2018 4:53 PM > >> To: Gao, Liming <liming.gao@intel.com> > >> Cc: edk2-devel@lists.01.org; lersek@redhat.com; zenith432@users.sourceforge.net > >> Subject: Re: [edk2] [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly > >> > >> On 11 June 2018 at 10:38, Gao, Liming <liming.gao@intel.com> wrote: > >> > Ard: > >> > Do you mean the default GCC compiler disables PIC and PIE for IA32 arch? But now, some distribution GCC compiler enables > PIC > >> and PIE by default. So, we have to obviously disable PIC and PIE in tools_def.txt. > >> > > >> > >> Yes. On my x86 Ubuntu 18.04 LTS system: > >> > >> $ gcc -v > >> Using built-in specs. > >> COLLECT_GCC=gcc > >> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper > >> OFFLOAD_TARGET_NAMES=nvptx-none > >> OFFLOAD_TARGET_DEFAULT=1 > >> Target: x86_64-linux-gnu > >> Configured with: ../src/configure -v --with-pkgversion='Ubuntu > >> 7.3.0-16ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs > >> --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ > >> --prefix=/usr --with-gcc-major-version-only > >> --with-as=/usr/bin/x86_64-linux-gnu-as > >> --with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7 > >> --program-prefix=x86_64-linux-gnu- --enable-shared > >> --enable-linker-build-id --libexecdir=/usr/lib > >> --without-included-gettext --enable-threads=posix --libdir=/usr/lib > >> --enable-nls --with-sysroot=/ --enable-clocale=gnu > >> --enable-libstdcxx-debug --enable-libstdcxx-time=yes > >> --with-default-libstdcxx-abi=new --enable-gnu-unique-object > >> --disable-vtable-verify --enable-libmpx --enable-plugin > >> --enable-default-pie --with-system-zlib --with-target-system-zlib > >> --enable-objc-gc=auto --enable-multiarch --disable-werror > >> --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 > >> --enable-multilib --with-tune=generic > >> --enable-offload-targets=nvptx-none --without-cuda-driver > >> --enable-checking=release --build=x86_64-linux-gnu > >> --host=x86_64-linux-gnu --target=x86_64-linux-gnu > >> Thread model: posix > >> gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3) > >> > >> > >> Notice the '--enable-default-pie' 4 lines from the bottom. > >> > >> > >> > >> >>-----Original Message----- > >> >>From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] > >> >>Sent: Monday, June 11, 2018 3:42 PM > >> >>To: edk2-devel@lists.01.org > >> >>Cc: Zhu, Yonghong <yonghong.zhu@intel.com>; Gao, Liming > >> >><liming.gao@intel.com>; lersek@redhat.com; Shi, Steven > >> >><steven.shi@intel.com>; zenith432@users.sourceforge.net; Ard Biesheuvel > >> >><ard.biesheuvel@linaro.org> > >> >>Subject: [PATCH] BaseTools/tools_def IA32: disable PIE code generation > >> >>explicitly > >> >> > >> >>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 > >> >>-- > >> >>2.17.1 > >> > > >> _______________________________________________ > >> edk2-devel mailing list > >> edk2-devel@lists.01.org > >> https://lists.01.org/mailman/listinfo/edk2-devel ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly 2018-06-11 16:09 ` Gao, Liming @ 2018-06-11 16:25 ` Ard Biesheuvel 0 siblings, 0 replies; 9+ messages in thread From: Ard Biesheuvel @ 2018-06-11 16:25 UTC (permalink / raw) To: Gao, Liming Cc: edk2-devel@lists.01.org, lersek@redhat.com, zenith432@users.sourceforge.net On 11 June 2018 at 18:09, Gao, Liming <liming.gao@intel.com> wrote: > Ard: > GCC49 tool chain can be used by GCC4.9 and above compiler. It provides the GCC setting without LTO. GCC5 tool chain provides GCC setting with LTO. So, I suggest to disable it also in GCC49 tool chain. > OK that works for me. >> -----Original Message----- >> From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] >> Sent: Tuesday, June 12, 2018 12:04 AM >> To: Gao, Liming <liming.gao@intel.com> >> Cc: edk2-devel@lists.01.org; lersek@redhat.com; zenith432@users.sourceforge.net >> Subject: Re: [edk2] [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly >> >> On 11 June 2018 at 18:00, Gao, Liming <liming.gao@intel.com> wrote: >> > Ard: >> > Is this option required in GCC49 tool chain? Or, this option is only required when lto is enabled? >> > >> >> It has nothing to do with LTO. >> >> In theory, it could be required for any toolchain that supports -fpic >> and or -fpie. However, not all 4.x toolchains support -fpie and so >> they don't support -fno-pie either. >> >> Given that the distros only changed this default recently (in the 5.x >> timeframe or later), it makes sense to only disable it for GCC5, >> although it is safe to disable it for GCC49 as well. >> >> >> -----Original Message----- >> >> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ard Biesheuvel >> >> Sent: Monday, June 11, 2018 4:53 PM >> >> To: Gao, Liming <liming.gao@intel.com> >> >> Cc: edk2-devel@lists.01.org; lersek@redhat.com; zenith432@users.sourceforge.net >> >> Subject: Re: [edk2] [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly >> >> >> >> On 11 June 2018 at 10:38, Gao, Liming <liming.gao@intel.com> wrote: >> >> > Ard: >> >> > Do you mean the default GCC compiler disables PIC and PIE for IA32 arch? But now, some distribution GCC compiler enables >> PIC >> >> and PIE by default. So, we have to obviously disable PIC and PIE in tools_def.txt. >> >> > >> >> >> >> Yes. On my x86 Ubuntu 18.04 LTS system: >> >> >> >> $ gcc -v >> >> Using built-in specs. >> >> COLLECT_GCC=gcc >> >> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper >> >> OFFLOAD_TARGET_NAMES=nvptx-none >> >> OFFLOAD_TARGET_DEFAULT=1 >> >> Target: x86_64-linux-gnu >> >> Configured with: ../src/configure -v --with-pkgversion='Ubuntu >> >> 7.3.0-16ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs >> >> --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ >> >> --prefix=/usr --with-gcc-major-version-only >> >> --with-as=/usr/bin/x86_64-linux-gnu-as >> >> --with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7 >> >> --program-prefix=x86_64-linux-gnu- --enable-shared >> >> --enable-linker-build-id --libexecdir=/usr/lib >> >> --without-included-gettext --enable-threads=posix --libdir=/usr/lib >> >> --enable-nls --with-sysroot=/ --enable-clocale=gnu >> >> --enable-libstdcxx-debug --enable-libstdcxx-time=yes >> >> --with-default-libstdcxx-abi=new --enable-gnu-unique-object >> >> --disable-vtable-verify --enable-libmpx --enable-plugin >> >> --enable-default-pie --with-system-zlib --with-target-system-zlib >> >> --enable-objc-gc=auto --enable-multiarch --disable-werror >> >> --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 >> >> --enable-multilib --with-tune=generic >> >> --enable-offload-targets=nvptx-none --without-cuda-driver >> >> --enable-checking=release --build=x86_64-linux-gnu >> >> --host=x86_64-linux-gnu --target=x86_64-linux-gnu >> >> Thread model: posix >> >> gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3) >> >> >> >> >> >> Notice the '--enable-default-pie' 4 lines from the bottom. >> >> >> >> >> >> >> >> >>-----Original Message----- >> >> >>From: Ard Biesheuvel [mailto:ard.biesheuvel@linaro.org] >> >> >>Sent: Monday, June 11, 2018 3:42 PM >> >> >>To: edk2-devel@lists.01.org >> >> >>Cc: Zhu, Yonghong <yonghong.zhu@intel.com>; Gao, Liming >> >> >><liming.gao@intel.com>; lersek@redhat.com; Shi, Steven >> >> >><steven.shi@intel.com>; zenith432@users.sourceforge.net; Ard Biesheuvel >> >> >><ard.biesheuvel@linaro.org> >> >> >>Subject: [PATCH] BaseTools/tools_def IA32: disable PIE code generation >> >> >>explicitly >> >> >> >> >> >>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 >> >> >>-- >> >> >>2.17.1 >> >> > >> >> _______________________________________________ >> >> edk2-devel mailing list >> >> edk2-devel@lists.01.org >> >> https://lists.01.org/mailman/listinfo/edk2-devel ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH] BaseTools/tools_def IA32: disable PIE code generation explicitly 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 9:13 ` Laszlo Ersek 1 sibling, 0 replies; 9+ messages in thread From: Laszlo Ersek @ 2018-06-11 9:13 UTC (permalink / raw) To: Ard Biesheuvel, edk2-devel Cc: yonghong.zhu, liming.gao, steven.shi, zenith432 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> ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2018-06-11 16:25 UTC | newest] Thread overview: 9+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 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 is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox