From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter =?utf-8?q?M=C3=BCller?= To: development@lists.ipfire.org Subject: [PATCH] linux: Randomize layout of sensitive kernel structures Date: Mon, 01 Aug 2022 17:18:07 +0000 Message-ID: <6f293556-db9a-086e-1b2d-5e7d10eee48b@ipfire.org> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0634964801958843281==" List-Id: --===============0634964801958843281== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable To quote from the kernel documentation: > If you say Y here, the layouts of structures that are entirely > function pointers (and have not been manually annotated with > __no_randomize_layout), or structures that have been explicitly > marked with __randomize_layout, will be randomized at compile-time. > This can introduce the requirement of an additional information > exposure vulnerability for exploits targeting these structure > types. > > Enabling this feature will introduce some performance impact, > slightly increase memory usage, and prevent the use of forensic > tools like Volatility against the system (unless the kernel > source tree isn't cleaned after kernel installation). > > The seed used for compilation is located at > scripts/gcc-plgins/randomize_layout_seed.h. It remains after > a make clean to allow for external modules to be compiled with > the existing seed and will be removed by a make mrproper or > make distclean. > > Note that the implementation requires gcc 4.7 or newer. Signed-off-by: Peter M=C3=BCller --- config/kernel/kernel.config.x86_64-ipfire | 3 ++- config/rootfiles/common/aarch64/linux | 5 +++++ config/rootfiles/common/armv6l/linux | 5 +++++ config/rootfiles/common/x86_64/linux | 5 +++++ 4 files changed, 17 insertions(+), 1 deletion(-) diff --git a/config/kernel/kernel.config.x86_64-ipfire b/config/kernel/kernel= .config.x86_64-ipfire index 40975b5fc..c8e7ada01 100644 --- a/config/kernel/kernel.config.x86_64-ipfire +++ b/config/kernel/kernel.config.x86_64-ipfire @@ -793,7 +793,8 @@ CONFIG_HAVE_GCC_PLUGINS=3Dy CONFIG_GCC_PLUGINS=3Dy # CONFIG_GCC_PLUGIN_CYC_COMPLEXITY is not set CONFIG_GCC_PLUGIN_LATENT_ENTROPY=3Dy -# CONFIG_GCC_PLUGIN_RANDSTRUCT is not set +CONFIG_GCC_PLUGIN_RANDSTRUCT=3Dy +CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE=3Dy # end of General architecture-dependent options =20 CONFIG_RT_MUTEXES=3Dy diff --git a/config/rootfiles/common/aarch64/linux b/config/rootfiles/common/= aarch64/linux index dbd6e8f2f..b3a642e56 100644 --- a/config/rootfiles/common/aarch64/linux +++ b/config/rootfiles/common/aarch64/linux @@ -7646,6 +7646,8 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/include/config/GARP #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGINS #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_LATENT_ENTROPY +#lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_RANDSTRUCT +#lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_RANDSTRUCT_PERFORMA= NCE #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_STRUCTLEAK #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_STRUCTLEAK_BYREF_ALL #lib/modules/KVER-ipfire/build/include/config/GCC_VERSION @@ -11684,6 +11686,7 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/include/generated/autoconf.h #lib/modules/KVER-ipfire/build/include/generated/bounds.h #lib/modules/KVER-ipfire/build/include/generated/compile.h +#lib/modules/KVER-ipfire/build/include/generated/randomize_layout_hash.h #lib/modules/KVER-ipfire/build/include/generated/timeconst.h #lib/modules/KVER-ipfire/build/include/generated/uapi #lib/modules/KVER-ipfire/build/include/generated/uapi/linux @@ -17129,6 +17132,8 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/latent_entropy_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/latent_entropy_plugin.so #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_plugin.c +#lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_plugin.so +#lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_seed.h #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/sancov_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/stackleak_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/structleak_plugin.c diff --git a/config/rootfiles/common/armv6l/linux b/config/rootfiles/common/a= rmv6l/linux index 79e4facfe..c3411fe8d 100644 --- a/config/rootfiles/common/armv6l/linux +++ b/config/rootfiles/common/armv6l/linux @@ -8071,6 +8071,8 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGINS #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_ARM_SSP_PER_TASK #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_LATENT_ENTROPY +#lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_RANDSTRUCT +#lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_RANDSTRUCT_PERFORMA= NCE #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_STRUCTLEAK #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_STRUCTLEAK_BYREF_ALL #lib/modules/KVER-ipfire/build/include/config/GCC_VERSION @@ -12134,6 +12136,7 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/include/generated/autoconf.h #lib/modules/KVER-ipfire/build/include/generated/bounds.h #lib/modules/KVER-ipfire/build/include/generated/compile.h +#lib/modules/KVER-ipfire/build/include/generated/randomize_layout_hash.h #lib/modules/KVER-ipfire/build/include/generated/timeconst.h #lib/modules/KVER-ipfire/build/include/generated/uapi #lib/modules/KVER-ipfire/build/include/generated/uapi/linux @@ -17579,6 +17582,8 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/latent_entropy_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/latent_entropy_plugin.so #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_plugin.c +#lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_plugin.so +#lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_seed.h #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/sancov_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/stackleak_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/structleak_plugin.c diff --git a/config/rootfiles/common/x86_64/linux b/config/rootfiles/common/x= 86_64/linux index b25f85a3a..1b78fe8c5 100644 --- a/config/rootfiles/common/x86_64/linux +++ b/config/rootfiles/common/x86_64/linux @@ -7624,6 +7624,8 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/include/config/GARP #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGINS #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_LATENT_ENTROPY +#lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_RANDSTRUCT +#lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_RANDSTRUCT_PERFORMA= NCE #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_STRUCTLEAK #lib/modules/KVER-ipfire/build/include/config/GCC_PLUGIN_STRUCTLEAK_BYREF_ALL #lib/modules/KVER-ipfire/build/include/config/GCC_VERSION @@ -12128,6 +12130,7 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/include/generated/autoconf.h #lib/modules/KVER-ipfire/build/include/generated/bounds.h #lib/modules/KVER-ipfire/build/include/generated/compile.h +#lib/modules/KVER-ipfire/build/include/generated/randomize_layout_hash.h #lib/modules/KVER-ipfire/build/include/generated/timeconst.h #lib/modules/KVER-ipfire/build/include/generated/uapi #lib/modules/KVER-ipfire/build/include/generated/uapi/linux @@ -17567,6 +17570,8 @@ etc/modprobe.d/ipv6.conf #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/latent_entropy_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/latent_entropy_plugin.so #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_plugin.c +#lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_plugin.so +#lib/modules/KVER-ipfire/build/scripts/gcc-plugins/randomize_layout_seed.h #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/sancov_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/stackleak_plugin.c #lib/modules/KVER-ipfire/build/scripts/gcc-plugins/structleak_plugin.c --=20 2.35.3 --===============0634964801958843281==--