Re: [RFC PATCH v1 15/28] riscv/mm: Implement map_shadow_stack() syscall

On Wed, Jan 24, 2024 at 10:21:40PM -0800, debug@rivosinc.com wrote:

From: Deepak Gupta debug@rivosinc.com

As discussed extensively in the changelog for the addition of this syscall on x86 ("x86/shstk: Introduce map_shadow_stack syscall") the existing mmap() and madvise() syscalls do not map entirely well onto the security requirements for guarded control stacks since they lead to windows where memory is allocated but not yet protected or stacks which are not properly and safely initialised. Instead a new syscall map_shadow_stack() has been defined which allocates and initialises a shadow stack page.

This patch implements this syscall for riscv. riscv doesn't require token to be setup by kernel because user mode can do that by itself. However to provide compatiblity and portability with other architectues, user mode can specify token set flag.

Signed-off-by: Deepak Gupta debug@rivosinc.com

arch/riscv/kernel/Makefile | 2 + arch/riscv/kernel/usercfi.c | 150 ++++++++++++++++++++++++++++++++ include/uapi/asm-generic/mman.h | 1 + 3 files changed, 153 insertions(+) create mode 100644 arch/riscv/kernel/usercfi.c

diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile index fee22a3d1b53..8c668269e886 100644 --- a/arch/riscv/kernel/Makefile +++ b/arch/riscv/kernel/Makefile @@ -102,3 +102,5 @@ obj-$(CONFIG_COMPAT) += compat_vdso/ obj-$(CONFIG_64BIT) += pi/ obj-$(CONFIG_ACPI) += acpi.o

+obj-$(CONFIG_RISCV_USER_CFI) += usercfi.o diff --git a/arch/riscv/kernel/usercfi.c b/arch/riscv/kernel/usercfi.c new file mode 100644 index 000000000000..35ede2cbc05b --- /dev/null +++ b/arch/riscv/kernel/usercfi.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0 +/*

• • Copyright (C) 2023 Rivos, Inc.

Nit: Should be updated to 2024

• • Deepak Gupta debug@rivosinc.com
• */

+#include <linux/sched.h> +#include <linux/bitops.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/mman.h> +#include <linux/uaccess.h> +#include <linux/sizes.h> +#include <linux/user.h> +#include <linux/syscalls.h> +#include <linux/prctl.h> +#include <asm/csr.h> +#include <asm/usercfi.h>

+#define SHSTK_ENTRY_SIZE sizeof(void *)

+/*

• • Writes on shadow stack can either be `sspush` or `ssamoswap`. `sspush` can happen
• • implicitly on current shadow stack pointed to by CSR_SSP. `ssamoswap` takes pointer to
• • shadow stack. To keep it simple, we plan to use `ssamoswap` to perform writes on shadow
• • stack.
• */

+static noinline unsigned long amo_user_shstk(unsigned long *addr, unsigned long val) +{

• /*

• * In case ssamoswap faults, return -1.
  

• * Never expect -1 on shadow stack. Expect return addresses and zero
  

• */
  

• unsigned long swap = -1;
• __enable_user_access();
• asm_volatile_goto(

• 		".option push\n"
  

• 		".option arch, +zicfiss\n"
  

+#ifdef CONFIG_64BIT

• 		"1: ssamoswap.d %0, %2, %1\n"
  

+#else

• 		"1: ssamoswap.w %0, %2, %1\n"
  

A SSAMOSWAP macro that conditionally defines this would be cleaner

+#endif

• 		_ASM_EXTABLE(1b, %l[fault])
  

• 		RISCV_ACQUIRE_BARRIER
  

• 		".option pop\n"
  

• 		: "=r" (swap), "+A" (*addr)
  

I just ran into this on one of my patches that not every compiler supports output args in asm goto blocks. You need to guard this with the kconfig option CC_HAS_ASM_GOTO_TIED_OUTPUT. Unfortunately, that means that this code needs two versions, or you can choose to gate CFI behind this option, it's supported by recent versions of GCC/CLANG.

For readability it is also nice to use labels for the asm variables such as `"=r" (swap)` can be `[swap] "=r" (swap)` and then replace %0 with %[swap].

- Charlie

• 		: "r" (val)
  

• 		: "memory"
  

• 		: fault
  

• 	);
  

• __disable_user_access();
• return swap;

+fault:

• __disable_user_access();
• return -1;

+}

+/*

• • Create a restore token on the shadow stack. A token is always XLEN wide
• • and aligned to XLEN.
• */

+static int create_rstor_token(unsigned long ssp, unsigned long *token_addr) +{

• unsigned long addr;
• /* Token must be aligned */
• if (!IS_ALIGNED(ssp, SHSTK_ENTRY_SIZE))

• return -EINVAL;
  

• /* On RISC-V we're constructing token to be function of address itself */
• addr = ssp - SHSTK_ENTRY_SIZE;
• if (amo_user_shstk((unsigned long __user *)addr, (unsigned long) ssp) == -1)

• return -EFAULT;
  

• if (token_addr)

• *token_addr = addr;
  

• return 0;

+}

+static unsigned long allocate_shadow_stack(unsigned long addr, unsigned long size,

• 		unsigned long token_offset,
  

• 		bool set_tok)
  

+{

• int flags = MAP_ANONYMOUS | MAP_PRIVATE;
• struct mm_struct *mm = current->mm;
• unsigned long populate, tok_loc = 0;
• if (addr)

• flags |= MAP_FIXED_NOREPLACE;
  

• mmap_write_lock(mm);
• addr = do_mmap(NULL, addr, size, PROT_SHADOWSTACK, flags,

• 		VM_SHADOW_STACK, 0, &populate, NULL);
  

• mmap_write_unlock(mm);
• if (!set_tok || IS_ERR_VALUE(addr))

• goto out;
  

• if (create_rstor_token(addr + token_offset, &tok_loc)) {

• vm_munmap(addr, size);
  

• return -EINVAL;
  

• }
• addr = tok_loc;

+out:

• return addr;

+}

+SYSCALL_DEFINE3(map_shadow_stack, unsigned long, addr, unsigned long, size, unsigned int, flags) +{

• bool set_tok = flags & SHADOW_STACK_SET_TOKEN;
• unsigned long aligned_size = 0;
• if (!cpu_supports_shadow_stack())

• return -EOPNOTSUPP;
  

• /* Anything other than set token should result in invalid param */
• if (flags & ~SHADOW_STACK_SET_TOKEN)

• return -EINVAL;
  

• /*

• * Unlike other architectures, on RISC-V, SSP pointer is held in CSR_SSP and is available
  

• * CSR in all modes. CSR accesses are performed using 12bit index programmed in instruction
  

• * itself. This provides static property on register programming and writes to CSR can't
  

• * be unintentional from programmer's perspective. As long as programmer has guarded areas
  

• * which perform writes to CSR_SSP properly, shadow stack pivoting is not possible. Since
  

• * CSR_SSP is writeable by user mode, it itself can setup a shadow stack token subsequent
  

• * to allocation. Although in order to provide portablity with other architecture (because
  

• * `map_shadow_stack` is arch agnostic syscall), RISC-V will follow expectation of a token
  

• * flag in flags and if provided in flags, setup a token at the base.
  

• */
  

• /* If there isn't space for a token */
• if (set_tok && size < SHSTK_ENTRY_SIZE)

• return -ENOSPC;
  

• if (addr && (addr % PAGE_SIZE))

• return -EINVAL;
  

• aligned_size = PAGE_ALIGN(size);
• if (aligned_size < size)

• return -EOVERFLOW;
  

• return allocate_shadow_stack(addr, aligned_size, size, set_tok);

+} diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h index 57e8195d0b53..0c0ac6214de6 100644 --- a/include/uapi/asm-generic/mman.h +++ b/include/uapi/asm-generic/mman.h @@ -19,4 +19,5 @@ #define MCL_FUTURE 2 /* lock all future mappings */ #define MCL_ONFAULT 4 /* lock all pages that are faulted in */ +#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */

#endif /* __ASM_GENERIC_MMAN_H */

2.43.0