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From: Deepak Gupta <debug@rivosinc.com>
To: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Eric Biederman <ebiederm@xmission.com>,
	Kees Cook <keescook@chromium.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: Deepak Gupta <debug@rivosinc.com>,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH v1 RFC Zisslpcfi 07/20] elf: ELF header parsing in GNU property for cfi state
Date: Sun, 12 Feb 2023 20:53:36 -0800	[thread overview]
Message-ID: <20230213045351.3945824-8-debug@rivosinc.com> (raw)
In-Reply-To: <20230213045351.3945824-1-debug@rivosinc.com>

Binaries enabled with support for control-flow integrity will have new
instructions that may fault on cpus which dont implement cfi mechanisms.
This change adds

 - stub for setting up cfi state when loading a binary. Architecture
   specific implementation can choose to implement this stub and setup
   cfi state for program.
 - define riscv ELF flag marker for forward cfi and backward cfi in
   uapi/linux/elf.h

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
---
 fs/binfmt_elf.c          | 5 +++++
 include/linux/elf.h      | 8 ++++++++
 include/uapi/linux/elf.h | 6 ++++++
 3 files changed, 19 insertions(+)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 9a780fafc539..bb431052eb01 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1277,6 +1277,11 @@ static int load_elf_binary(struct linux_binprm *bprm)
 
 	set_binfmt(&elf_format);
 
+#if defined(CONFIG_USER_SHADOW_STACK) || defined(CONFIG_USER_INDIRECT_BR_LP)
+	retval = arch_elf_setup_cfi_state(&arch_state);
+	if (retval < 0)
+		goto out;
+#endif
 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
 	retval = ARCH_SETUP_ADDITIONAL_PAGES(bprm, elf_ex, !!interpreter);
 	if (retval < 0)
diff --git a/include/linux/elf.h b/include/linux/elf.h
index c9a46c4e183b..106d28f065aa 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -109,4 +109,12 @@ static inline int arch_elf_adjust_prot(int prot,
 }
 #endif
 
+#if defined(CONFIG_USER_SHADOW_STACK) || defined(CONFIG_USER_INDIRECT_BR_LP)
+extern int arch_elf_setup_cfi_state(const struct arch_elf_state *state);
+#else
+static inline int arch_elf_setup_cfi_state(const struct arch_elf_state *state)
+{
+	return 0;
+}
+#endif
 #endif /* _LINUX_ELF_H */
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 4c6a8fa5e7ed..1cbd332061dc 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -468,4 +468,10 @@ typedef struct elf64_note {
 /* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */
 #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI	(1U << 0)
 
+/* .note.gnu.property types for RISCV: */
+/* Bits for GNU_PROPERTY_RISCV_FEATURE_1_FCFI/BCFI */
+#define GNU_PROPERTY_RISCV_FEATURE_1_AND  0xc0000000
+#define GNU_PROPERTY_RISCV_FEATURE_1_FCFI (1u << 0)
+#define GNU_PROPERTY_RISCV_FEATURE_1_BCFI (1u << 1)
+
 #endif /* _UAPI_LINUX_ELF_H */
-- 
2.25.1


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linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

WARNING: multiple messages have this Message-ID (diff)
From: Deepak Gupta <debug@rivosinc.com>
To: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Eric Biederman <ebiederm@xmission.com>,
	Kees Cook <keescook@chromium.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: Deepak Gupta <debug@rivosinc.com>,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH v1 RFC Zisslpcfi 07/20] elf: ELF header parsing in GNU property for cfi state
Date: Sun, 12 Feb 2023 20:53:36 -0800	[thread overview]
Message-ID: <20230213045351.3945824-8-debug@rivosinc.com> (raw)
In-Reply-To: <20230213045351.3945824-1-debug@rivosinc.com>

Binaries enabled with support for control-flow integrity will have new
instructions that may fault on cpus which dont implement cfi mechanisms.
This change adds

 - stub for setting up cfi state when loading a binary. Architecture
   specific implementation can choose to implement this stub and setup
   cfi state for program.
 - define riscv ELF flag marker for forward cfi and backward cfi in
   uapi/linux/elf.h

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
---
 fs/binfmt_elf.c          | 5 +++++
 include/linux/elf.h      | 8 ++++++++
 include/uapi/linux/elf.h | 6 ++++++
 3 files changed, 19 insertions(+)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 9a780fafc539..bb431052eb01 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1277,6 +1277,11 @@ static int load_elf_binary(struct linux_binprm *bprm)
 
 	set_binfmt(&elf_format);
 
+#if defined(CONFIG_USER_SHADOW_STACK) || defined(CONFIG_USER_INDIRECT_BR_LP)
+	retval = arch_elf_setup_cfi_state(&arch_state);
+	if (retval < 0)
+		goto out;
+#endif
 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
 	retval = ARCH_SETUP_ADDITIONAL_PAGES(bprm, elf_ex, !!interpreter);
 	if (retval < 0)
diff --git a/include/linux/elf.h b/include/linux/elf.h
index c9a46c4e183b..106d28f065aa 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -109,4 +109,12 @@ static inline int arch_elf_adjust_prot(int prot,
 }
 #endif
 
+#if defined(CONFIG_USER_SHADOW_STACK) || defined(CONFIG_USER_INDIRECT_BR_LP)
+extern int arch_elf_setup_cfi_state(const struct arch_elf_state *state);
+#else
+static inline int arch_elf_setup_cfi_state(const struct arch_elf_state *state)
+{
+	return 0;
+}
+#endif
 #endif /* _LINUX_ELF_H */
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 4c6a8fa5e7ed..1cbd332061dc 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -468,4 +468,10 @@ typedef struct elf64_note {
 /* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */
 #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI	(1U << 0)
 
+/* .note.gnu.property types for RISCV: */
+/* Bits for GNU_PROPERTY_RISCV_FEATURE_1_FCFI/BCFI */
+#define GNU_PROPERTY_RISCV_FEATURE_1_AND  0xc0000000
+#define GNU_PROPERTY_RISCV_FEATURE_1_FCFI (1u << 0)
+#define GNU_PROPERTY_RISCV_FEATURE_1_BCFI (1u << 1)
+
 #endif /* _UAPI_LINUX_ELF_H */
-- 
2.25.1


  parent reply	other threads:[~2023-02-13  4:54 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-13  4:53 [PATCH v1 RFC Zisslpcfi 00/20] riscv control-flow integrity for U mode Deepak Gupta
2023-02-13  4:53 ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 01/20] sslp stubs: shadow stack and landing pad stubs Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 02/20] riscv: zisslpcfi enumeration Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 03/20] riscv: zisslpcfi extension csr and bit definitions Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 04/20] riscv: kernel enabling user code for shadow stack and landing pad Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 05/20] mmap : Introducing new protection "PROT_SHADOWSTACK" for mmap Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  7:10   ` kernel test robot
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 06/20] riscv: Implementing "PROT_SHADOWSTACK" on riscv Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` Deepak Gupta [this message]
2023-02-13  4:53   ` [PATCH v1 RFC Zisslpcfi 07/20] elf: ELF header parsing in GNU property for cfi state Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 08/20] riscv: ELF header parsing in GNU property for riscv zisslpcfi Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  7:10   ` kernel test robot
2023-02-13  8:57   ` kernel test robot
2023-02-13 18:34   ` kernel test robot
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 09/20] riscv mmu: riscv shadow stack page fault handling Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13 19:36   ` kernel test robot
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 10/20] riscv mmu: write protect and shadow stack Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 11/20] mmu: maybe_mkwrite updated to manufacture shadow stack PTEs Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13 12:05   ` David Hildenbrand
2023-02-13 12:05     ` David Hildenbrand
2023-02-13 14:37     ` Deepak Gupta
2023-02-13 14:37       ` Deepak Gupta
2023-02-13 14:56       ` David Hildenbrand
2023-02-13 14:56         ` David Hildenbrand
2023-02-13 20:01         ` Deepak Gupta
2023-02-13 20:01           ` Deepak Gupta
2023-02-14 12:10           ` David Hildenbrand
2023-02-14 12:10             ` David Hildenbrand
2023-02-14 18:27             ` Edgecombe, Rick P
2023-02-14 18:27               ` Edgecombe, Rick P
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 12/20] riscv mm: manufacture shadow stack pte and is vma shadowstack Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 13/20] riscv: illegal instruction handler for cfi violations Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 14/20] riscv: audit mode " Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 15/20] sslp prctl: arch-agnostic prctl for shadow stack and landing pad instr Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  7:31   ` kernel test robot
2023-05-25 17:17   ` Mark Brown
2023-05-25 17:17     ` Mark Brown
2023-06-07 20:22   ` Mark Brown
2023-06-07 20:22     ` Mark Brown
2023-10-09 21:22     ` Deepak Gupta
2023-10-09 21:22       ` Deepak Gupta
2023-10-10 16:17       ` Mark Brown
2023-10-10 16:17         ` Mark Brown
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 16/20] riscv: Implements sslp prctls Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 17/20] riscv ucontext: adding shadow stack pointer field in ucontext Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 18/20] riscv signal: Save and restore of shadow stack for signal Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 19/20] config: adding two new config for control flow integrity Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta
2023-02-13  4:53 ` [PATCH v1 RFC Zisslpcfi 20/20] riscv: select config for shadow stack and landing pad instr support Deepak Gupta
2023-02-13  4:53   ` Deepak Gupta

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