Hi all, How about the generic_entry version: https://lore.kernel.org/lkml/20220907014809.919979-1-guoren@xxxxxxxxxx/ On Wed, Sep 7, 2022 at 1:35 AM <Conor.Dooley@xxxxxxxxxxxxx> wrote: > > On 03/09/2022 17:23, guoren@xxxxxxxxxx wrote: > > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > > > From: Xianting Tian <xianting.tian@xxxxxxxxxxxxxxxxx> > > > > This adds support for the STACKLEAK gcc plugin to RISC-V and disables > > the plugin in EFI stub code, which is out of scope for the protection. > > > > For the benefits of STACKLEAK feature, please check the commit > > afaef01c0015 ("x86/entry: Add STACKLEAK erasing the kernel stack at the end of syscalls") > > > > Performance impact (tested on qemu env with 1 riscv64 hart, 1GB mem) > > hackbench -s 512 -l 200 -g 15 -f 25 -P > > 2.0% slowdown > > > > Signed-off-by: Xianting Tian <xianting.tian@xxxxxxxxxxxxxxxxx> > > What changed since Xianting posted it himself a week ago: > https://lore.kernel.org/linux-riscv/20220828135407.3897717-1-xianting.tian@xxxxxxxxxxxxxxxxx/ > > There's an older patch from Du Lao adding STACKLEAK too: > https://lore.kernel.org/linux-riscv/20220615213834.3116135-1-daolu@xxxxxxxxxxxx/ > > But since there's been no activity there since June... > > > --- > > arch/riscv/Kconfig | 1 + > > arch/riscv/include/asm/processor.h | 4 ++++ > > arch/riscv/kernel/entry.S | 3 +++ > > drivers/firmware/efi/libstub/Makefile | 2 +- > > 4 files changed, 9 insertions(+), 1 deletion(-) > > > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > > index ed66c31e4655..61fd0dad4463 100644 > > --- a/arch/riscv/Kconfig > > +++ b/arch/riscv/Kconfig > > @@ -85,6 +85,7 @@ config RISCV > > select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE > > select HAVE_ARCH_THREAD_STRUCT_WHITELIST > > select HAVE_ARCH_VMAP_STACK if MMU && 64BIT > > + select HAVE_ARCH_STACKLEAK > > select HAVE_ASM_MODVERSIONS > > select HAVE_CONTEXT_TRACKING_USER > > select HAVE_DEBUG_KMEMLEAK > > diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile > > index d0537573501e..5e1fc4f82883 100644 > > --- a/drivers/firmware/efi/libstub/Makefile > > +++ b/drivers/firmware/efi/libstub/Makefile > > @@ -25,7 +25,7 @@ cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ > > -fno-builtin -fpic \ > > $(call cc-option,-mno-single-pic-base) > > cflags-$(CONFIG_RISCV) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ > > - -fpic > > + -fpic $(DISABLE_STACKLEAK_PLUGIN) > > > > cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt > > > > -- > > 2.17.1 > > > > > > _______________________________________________ > > linux-riscv mailing list > > linux-riscv@xxxxxxxxxxxxxxxxxxx > > http://lists.infradead.org/mailman/listinfo/linux-riscv > -- Best Regards Guo Ren
