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Wed, 15 Oct 2025 13:57:01 -0700 (PDT) Date: Wed, 15 Oct 2025 13:56:56 -0700 From: Deepak Gupta To: Charles Mirabile Cc: Liam.Howlett@oracle.com, a.hindborg@kernel.org, akpm@linux-foundation.org, alex.gaynor@gmail.com, alexghiti@rivosinc.com, aliceryhl@google.com, alistair.francis@wdc.com, andybnac@gmail.com, aou@eecs.berkeley.edu, arnd@arndb.de, atishp@rivosinc.com, bjorn3_gh@protonmail.com, boqun.feng@gmail.com, bp@alien8.de, brauner@kernel.org, broonie@kernel.org, charlie@rivosinc.com, cleger@rivosinc.com, conor+dt@kernel.org, conor@kernel.org, corbet@lwn.net, dave.hansen@linux.intel.com, devicetree@vger.kernel.org, ebiederm@xmission.com, evan@rivosinc.com, gary@garyguo.net, hpa@zytor.com, jannh@google.com, jim.shu@sifive.com, kees@kernel.org, kito.cheng@sifive.com, krzk+dt@kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, lorenzo.stoakes@oracle.com, lossin@kernel.org, mingo@redhat.com, ojeda@kernel.org, oleg@redhat.com, palmer@dabbelt.com, paul.walmsley@sifive.com, peterz@infradead.org, richard.henderson@linaro.org, rick.p.edgecombe@intel.com, robh@kernel.org, rust-for-linux@vger.kernel.org, samitolvanen@google.com, shuah@kernel.org, tglx@linutronix.de, tmgross@umich.edu, vbabka@suse.cz, x86@kernel.org Subject: Re: [PATCH v20 24/28] arch/riscv: dual vdso creation logic and select vdso based on hw Message-ID: References: <20251013-v5_user_cfi_series-v20-24-b9de4be9912e@rivosinc.com> <20251015203611.2572538-1-cmirabil@redhat.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20251015203611.2572538-1-cmirabil@redhat.com> Hi Charles, On Wed, Oct 15, 2025 at 04:36:11PM -0400, Charles Mirabile wrote: >Hi Deepak - > >On Mon, Oct 13, 2025 at 02:56:16PM -0700, Deepak Gupta wrote: >> Shadow stack instructions are taken from zimop (mandated on RVA23). >> Any hardware prior to RVA23 profile will fault on shado stack instruction. >> Any userspace with shadow stack instruction in it will fault on such >> hardware. Thus such userspace can't be brought onto such a hardware. >> >> It's not known how userspace will respond to such binary fragmentation. >> However in order to keep kernel portable across such different hardware, >> `arch/riscv/kernel/vdso_cfi` is created which has logic (Makefile) to >> compile `arch/riscv/kernel/vdso` sources with cfi flags and then changes >> in `arch/riscv/kernel/vdso.c` for selecting appropriate vdso depending >> on whether underlying hardware(cpu) implements zimop extension. Offset >> of vdso symbols will change due to having two different vdso binaries, >> there is added logic to include new generated vdso offset header and >> dynamically select offset (like for rt_sigreturn). > >This looks great. As kernel test robot highlighted, the code doesn't build >when the config is off, but I was able to fix it with the attached patch. Yes sorry about that. Locally include/generated had both files and that's how I missed it. > >Assuming that these changes or equivalent are folded in, you have my: > Yes v21 changes are equivalent to what you proposed. >Acked-by: Charles Mirabile If I send another version due to some other issue, I'll collect your tag. Else Paul, Can you apply the tag when you take it in. -Deepak > >As merely a user whose previous concerns have been addressed, I am not >sure what that is worth, but I appreciate your effort on this. Thanks. > >> >> Signed-off-by: Deepak Gupta >> --- >> arch/riscv/Makefile | 3 +++ >> arch/riscv/include/asm/vdso.h | 7 ++++++- >> arch/riscv/kernel/Makefile | 1 + >> arch/riscv/kernel/vdso.c | 7 +++++++ >> arch/riscv/kernel/vdso/Makefile | 29 ++++++++++++++++++++--------- >> arch/riscv/kernel/vdso/gen_vdso_offsets.sh | 4 +++- >> arch/riscv/kernel/vdso_cfi/Makefile | 25 +++++++++++++++++++++++++ >> arch/riscv/kernel/vdso_cfi/vdso-cfi.S | 11 +++++++++++ >> 8 files changed, 76 insertions(+), 11 deletions(-) >> >> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile >> index f60c2de0ca08..b74b63da16a7 100644 >> --- a/arch/riscv/Makefile >> +++ b/arch/riscv/Makefile >> @@ -176,6 +176,8 @@ ifeq ($(CONFIG_MMU),y) >> prepare: vdso_prepare >> vdso_prepare: prepare0 >> $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h >> + $(if $(CONFIG_RISCV_USER_CFI),$(Q)$(MAKE) \ >> + $(build)=arch/riscv/kernel/vdso_cfi include/generated/vdso-cfi-offsets.h) >> $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ >> $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) >> >> @@ -183,6 +185,7 @@ endif >> endif >> >> vdso-install-y += arch/riscv/kernel/vdso/vdso.so.dbg >> +vdso-install-$(CONFIG_RISCV_USER_CFI) += arch/riscv/kernel/vdso_cfi/vdso-cfi.so.dbg >> vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg >> >> BOOT_TARGETS := Image Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader loader.bin xipImage vmlinuz.efi >> diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h >> index f80357fe24d1..3fc8f72b8bfb 100644 >> --- a/arch/riscv/include/asm/vdso.h >> +++ b/arch/riscv/include/asm/vdso.h >> @@ -18,9 +18,13 @@ >> >> #ifndef __ASSEMBLER__ >> #include >> +#include >> >> #define VDSO_SYMBOL(base, name) \ >> - (void __user *)((unsigned long)(base) + __vdso_##name##_offset) >> + ((IS_ENABLED(CONFIG_RISCV_USER_CFI) && \ >> + riscv_has_extension_unlikely(RISCV_ISA_EXT_ZIMOP)) ? \ >> + (void __user *)((unsigned long)(base) + __vdso_##name##_cfi_offset) : \ >> + (void __user *)((unsigned long)(base) + __vdso_##name##_offset)) >> >> #ifdef CONFIG_COMPAT >> #include >> @@ -33,6 +37,7 @@ extern char compat_vdso_start[], compat_vdso_end[]; >> #endif /* CONFIG_COMPAT */ >> >> extern char vdso_start[], vdso_end[]; >> +extern char vdso_cfi_start[], vdso_cfi_end[]; >> >> #endif /* !__ASSEMBLER__ */ >> >> diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile >> index 2d0e0dcedbd3..9026400cba10 100644 >> --- a/arch/riscv/kernel/Makefile >> +++ b/arch/riscv/kernel/Makefile >> @@ -72,6 +72,7 @@ obj-y += vendor_extensions/ >> obj-y += probes/ >> obj-y += tests/ >> obj-$(CONFIG_MMU) += vdso.o vdso/ >> +obj-$(CONFIG_RISCV_USER_CFI) += vdso_cfi/ >> >> obj-$(CONFIG_RISCV_MISALIGNED) += traps_misaligned.o >> obj-$(CONFIG_RISCV_MISALIGNED) += unaligned_access_speed.o >> diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c >> index 3a8e038b10a2..bf080e519101 100644 >> --- a/arch/riscv/kernel/vdso.c >> +++ b/arch/riscv/kernel/vdso.c >> @@ -98,6 +98,13 @@ static struct __vdso_info compat_vdso_info __ro_after_init = { >> >> static int __init vdso_init(void) >> { >> + /* Hart implements zimop, expose cfi compiled vdso */ >> + if (IS_ENABLED(CONFIG_RISCV_USER_CFI) && >> + riscv_has_extension_unlikely(RISCV_ISA_EXT_ZIMOP)) { >> + vdso_info.vdso_code_start = vdso_cfi_start; >> + vdso_info.vdso_code_end = vdso_cfi_end; >> + } >> + >> __vdso_init(&vdso_info); >> #ifdef CONFIG_COMPAT >> __vdso_init(&compat_vdso_info); >> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile >> index 272f1d837a80..a842dc034571 100644 >> --- a/arch/riscv/kernel/vdso/Makefile >> +++ b/arch/riscv/kernel/vdso/Makefile >> @@ -20,6 +20,10 @@ endif >> ifdef VDSO_CFI_BUILD >> CFI_MARCH = _zicfilp_zicfiss >> CFI_FULL = -fcf-protection=full >> +CFI_SUFFIX = -cfi >> +OFFSET_SUFFIX = _cfi >> +ccflags-y += -DVDSO_CFI=1 >> +asflags-y += -DVDSO_CFI=1 >> endif >> >> # Files to link into the vdso >> @@ -48,13 +52,20 @@ endif >> CFLAGS_hwprobe.o += -fPIC >> >> # Build rules >> -targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds >> +vdso_offsets := vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),)-offsets.h >> +vdso_o := vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),).o >> +vdso_so := vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),).so >> +vdso_so_dbg := vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),).so.dbg >> +vdso_lds := vdso.lds >> + >> +targets := $(obj-vdso) $(vdso_so) $(vdso_so_dbg) $(vdso_lds) >> + >> obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) >> >> -obj-y += vdso.o >> -CPPFLAGS_vdso.lds += -P -C -U$(ARCH) >> +obj-y += vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),).o >> +CPPFLAGS_$(vdso_lds) += -P -C -U$(ARCH) >> ifneq ($(filter vgettimeofday, $(vdso-syms)),) >> -CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY >> +CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY >> endif >> >> # Disable -pg to prevent insert call site >> @@ -63,12 +74,12 @@ CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) >> CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) >> >> # Force dependency >> -$(obj)/vdso.o: $(obj)/vdso.so >> +$(obj)/$(vdso_o): $(obj)/$(vdso_so) >> >> # link rule for the .so file, .lds has to be first >> -$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE >> +$(obj)/$(vdso_so_dbg): $(obj)/$(vdso_lds) $(obj-vdso) FORCE >> $(call if_changed,vdsold_and_check) >> -LDFLAGS_vdso.so.dbg = -shared -soname=linux-vdso.so.1 \ >> +LDFLAGS_$(vdso_so_dbg) = -shared -soname=linux-vdso.so.1 \ >> --build-id=sha1 --eh-frame-hdr >> >> # strip rule for the .so file >> @@ -79,9 +90,9 @@ $(obj)/%.so: $(obj)/%.so.dbg FORCE >> # Generate VDSO offsets using helper script >> gen-vdsosym := $(src)/gen_vdso_offsets.sh >> quiet_cmd_vdsosym = VDSOSYM $@ >> - cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ >> + cmd_vdsosym = $(NM) $< | $(gen-vdsosym) $(OFFSET_SUFFIX) | LC_ALL=C sort > $@ >> >> -include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE >> +include/generated/$(vdso_offsets): $(obj)/$(vdso_so_dbg) FORCE >> $(call if_changed,vdsosym) >> >> # actual build commands >> diff --git a/arch/riscv/kernel/vdso/gen_vdso_offsets.sh b/arch/riscv/kernel/vdso/gen_vdso_offsets.sh >> index c2e5613f3495..bd5d5afaaa14 100755 >> --- a/arch/riscv/kernel/vdso/gen_vdso_offsets.sh >> +++ b/arch/riscv/kernel/vdso/gen_vdso_offsets.sh >> @@ -2,4 +2,6 @@ >> # SPDX-License-Identifier: GPL-2.0 >> >> LC_ALL=C >> -sed -n -e 's/^[0]\+\(0[0-9a-fA-F]*\) . \(__vdso_[a-zA-Z0-9_]*\)$/\#define \2_offset\t0x\1/p' >> +SUFFIX=${1:-""} >> +sed -n -e \ >> +'s/^[0]\+\(0[0-9a-fA-F]*\) . \(__vdso_[a-zA-Z0-9_]*\)$/\#define \2'$SUFFIX'_offset\t0x\1/p' >> diff --git a/arch/riscv/kernel/vdso_cfi/Makefile b/arch/riscv/kernel/vdso_cfi/Makefile >> new file mode 100644 >> index 000000000000..8ebd190782b0 >> --- /dev/null >> +++ b/arch/riscv/kernel/vdso_cfi/Makefile >> @@ -0,0 +1,25 @@ >> +# SPDX-License-Identifier: GPL-2.0-only >> +# RISC-V VDSO CFI Makefile >> +# This Makefile builds the VDSO with CFI support when CONFIG_RISCV_USER_CFI is enabled >> + >> +# setting VDSO_CFI_BUILD triggers build for vdso differently >> +VDSO_CFI_BUILD := 1 >> + >> +# Set the source directory to the main vdso directory >> +src := $(srctree)/arch/riscv/kernel/vdso >> + >> +# Copy all .S and .c files from vdso directory to vdso_cfi object build directory >> +vdso_c_sources := $(wildcard $(src)/*.c) >> +vdso_S_sources := $(wildcard $(src)/*.S) >> +vdso_c_objects := $(addprefix $(obj)/, $(notdir $(vdso_c_sources))) >> +vdso_S_objects := $(addprefix $(obj)/, $(notdir $(vdso_S_sources))) >> + >> +$(vdso_S_objects): $(obj)/%.S: $(src)/%.S >> + $(Q)cp $< $@ >> + >> +$(vdso_c_objects): $(obj)/%.c: $(src)/%.c >> + $(Q)cp $< $@ >> + >> +# Include the main VDSO Makefile which contains all the build rules and sources >> +# The VDSO_CFI_BUILD variable will be passed to it to enable CFI compilation >> +include $(src)/Makefile >> diff --git a/arch/riscv/kernel/vdso_cfi/vdso-cfi.S b/arch/riscv/kernel/vdso_cfi/vdso-cfi.S >> new file mode 100644 >> index 000000000000..d426f6accb35 >> --- /dev/null >> +++ b/arch/riscv/kernel/vdso_cfi/vdso-cfi.S >> @@ -0,0 +1,11 @@ >> +/* SPDX-License-Identifier: GPL-2.0-only */ >> +/* >> + * Copyright 2025 Rivos, Inc >> + */ >> + >> +#define vdso_start vdso_cfi_start >> +#define vdso_end vdso_cfi_end >> + >> +#define __VDSO_PATH "arch/riscv/kernel/vdso_cfi/vdso-cfi.so" >> + >> +#include "../vdso/vdso.S" >> >> -- >> 2.43.0 >> >> >> _______________________________________________ >> linux-riscv mailing list >> linux-riscv@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-riscv >--- >diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h >index 3fc8f72b8bfb..9cfbb390270f 100644 >--- a/arch/riscv/include/asm/vdso.h >+++ b/arch/riscv/include/asm/vdso.h >@@ -18,13 +18,21 @@ > > #ifndef __ASSEMBLER__ > #include >+#if IS_ENABLED(CONFIG_RISCV_USER_CFI) >+ > #include > > #define VDSO_SYMBOL(base, name) \ >- ((IS_ENABLED(CONFIG_RISCV_USER_CFI) && \ >- riscv_has_extension_unlikely(RISCV_ISA_EXT_ZIMOP)) ? \ >- (void __user *)((unsigned long)(base) + __vdso_##name##_cfi_offset) : \ >- (void __user *)((unsigned long)(base) + __vdso_##name##_offset)) >+ (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZIMOP)) ? \ >+ (void __user *)((unsigned long)(base) + __vdso_##name##_cfi_offset) : \ >+ (void __user *)((unsigned long)(base) + __vdso_##name##_offset) >+ >+#else /* !CONFIG_RISCV_USER_CFI */ >+ >+#define VDSO_SYMBOL(base, name) \ >+ (void __user *)((unsigned long)(base) + __vdso_##name##_offset) >+ >+#endif /* CONFIG_RISCV_USER_CFI */ > > #ifdef CONFIG_COMPAT > #include >