diff mbox series

[v6,33/33] kselftest/riscv: kselftest for user mode cfi

Message ID 20241008-v5_user_cfi_series-v6-33-60d9fe073f37@rivosinc.com (mailing list archive)
State Superseded
Headers show
Series riscv control-flow integrity for usermode | expand

Checks

Context Check Description
conchuod/vmtest-fixes-PR fail merge-conflict

Commit Message

Deepak Gupta Oct. 8, 2024, 10:37 p.m. UTC 
Adds kselftest for RISC-V control flow integrity implementation for user
mode. There is not a lot going on in kernel for enabling landing pad for
user mode. cfi selftest are intended to be compiled with zicfilp and
zicfiss enabled compiler. Thus kselftest simply checks if landing pad and
shadow stack for the binary and process are enabled or not. selftest then
register a signal handler for SIGSEGV. Any control flow violation are
reported as SIGSEGV with si_code = SEGV_CPERR. Test will fail on receiving
any SEGV_CPERR. Shadow stack part has more changes in kernel and thus there
are separate tests for that

- Exercise `map_shadow_stack` syscall
- `fork` test to make sure COW works for shadow stack pages
- gup tests
  Kernel uses FOLL_FORCE when access happens to memory via
  /proc/<pid>/mem. Not breaking that for shadow stack.
- signal test. Make sure signal delivery results in token creation on
  shadow stack and consumes (and verifies) token on sigreturn
- shadow stack protection test. attempts to write using regular store
  instruction on shadow stack memory must result in access faults

Test outut
==========

"""
TAP version 13
1..5
  This is to ensure shadow stack is indeed enabled and working
  This is to ensure shadow stack is indeed enabled and working
ok 1 shstk fork test
ok 2 map shadow stack syscall
ok 3 shadow stack gup tests
ok 4 shadow stack signal tests
ok 5 memory protections of shadow stack memory
"""

Signed-off-by: Deepak Gupta <debug@rivosinc.com>
---
 tools/testing/selftests/riscv/Makefile             |   2 +-
 tools/testing/selftests/riscv/cfi/.gitignore       |   3 +
 tools/testing/selftests/riscv/cfi/Makefile         |  10 +
 tools/testing/selftests/riscv/cfi/cfi_rv_test.h    |  84 +++++
 tools/testing/selftests/riscv/cfi/riscv_cfi_test.c |  78 +++++
 tools/testing/selftests/riscv/cfi/shadowstack.c    | 373 +++++++++++++++++++++
 tools/testing/selftests/riscv/cfi/shadowstack.h    |  37 ++
 7 files changed, 586 insertions(+), 1 deletion(-)

Comments

Zong Li Oct. 11, 2024, 5:44 a.m. UTC | #1 
On Wed, Oct 9, 2024 at 7:46 AM Deepak Gupta <debug@rivosinc.com> wrote:
>
> Adds kselftest for RISC-V control flow integrity implementation for user
> mode. There is not a lot going on in kernel for enabling landing pad for
> user mode. cfi selftest are intended to be compiled with zicfilp and
> zicfiss enabled compiler. Thus kselftest simply checks if landing pad and
> shadow stack for the binary and process are enabled or not. selftest then
> register a signal handler for SIGSEGV. Any control flow violation are
> reported as SIGSEGV with si_code = SEGV_CPERR. Test will fail on receiving
> any SEGV_CPERR. Shadow stack part has more changes in kernel and thus there
> are separate tests for that
>
> - Exercise `map_shadow_stack` syscall
> - `fork` test to make sure COW works for shadow stack pages
> - gup tests
>   Kernel uses FOLL_FORCE when access happens to memory via
>   /proc/<pid>/mem. Not breaking that for shadow stack.
> - signal test. Make sure signal delivery results in token creation on
>   shadow stack and consumes (and verifies) token on sigreturn
> - shadow stack protection test. attempts to write using regular store
>   instruction on shadow stack memory must result in access faults
>
> Test outut
> ==========
>
> """
> TAP version 13
> 1..5
>   This is to ensure shadow stack is indeed enabled and working
>   This is to ensure shadow stack is indeed enabled and working
> ok 1 shstk fork test
> ok 2 map shadow stack syscall
> ok 3 shadow stack gup tests
> ok 4 shadow stack signal tests
> ok 5 memory protections of shadow stack memory
> """
>
> Signed-off-by: Deepak Gupta <debug@rivosinc.com>
> ---
>  tools/testing/selftests/riscv/Makefile             |   2 +-
>  tools/testing/selftests/riscv/cfi/.gitignore       |   3 +
>  tools/testing/selftests/riscv/cfi/Makefile         |  10 +
>  tools/testing/selftests/riscv/cfi/cfi_rv_test.h    |  84 +++++
>  tools/testing/selftests/riscv/cfi/riscv_cfi_test.c |  78 +++++
>  tools/testing/selftests/riscv/cfi/shadowstack.c    | 373 +++++++++++++++++++++
>  tools/testing/selftests/riscv/cfi/shadowstack.h    |  37 ++
>  7 files changed, 586 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/riscv/Makefile b/tools/testing/selftests/riscv/Makefile
> index 7ce03d832b64..6e142fe004ab 100644
> --- a/tools/testing/selftests/riscv/Makefile
> +++ b/tools/testing/selftests/riscv/Makefile
> @@ -5,7 +5,7 @@
>  ARCH ?= $(shell uname -m 2>/dev/null || echo not)
>
>  ifneq (,$(filter $(ARCH),riscv))
> -RISCV_SUBTARGETS ?= hwprobe vector mm sigreturn
> +RISCV_SUBTARGETS ?= hwprobe vector mm sigreturn cfi
>  else
>  RISCV_SUBTARGETS :=
>  endif
> diff --git a/tools/testing/selftests/riscv/cfi/.gitignore b/tools/testing/selftests/riscv/cfi/.gitignore
> new file mode 100644
> index 000000000000..82545863bac6
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/cfi/.gitignore
> @@ -0,0 +1,3 @@
> +cfitests
> +riscv_cfi_test
> +shadowstack
> diff --git a/tools/testing/selftests/riscv/cfi/Makefile b/tools/testing/selftests/riscv/cfi/Makefile
> new file mode 100644
> index 000000000000..b65f7ff38a32
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/cfi/Makefile
> @@ -0,0 +1,10 @@
> +CFLAGS += -I$(top_srcdir)/tools/include
> +
> +CFLAGS += -march=rv64gc_zicfilp_zicfiss
> +
> +TEST_GEN_PROGS := cfitests
> +
> +include ../../lib.mk
> +
> +$(OUTPUT)/cfitests: riscv_cfi_test.c shadowstack.c
> +       $(CC) -o$@ $(CFLAGS) $(LDFLAGS) $^
> diff --git a/tools/testing/selftests/riscv/cfi/cfi_rv_test.h b/tools/testing/selftests/riscv/cfi/cfi_rv_test.h
> new file mode 100644
> index 000000000000..0fefdc33f71e
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/cfi/cfi_rv_test.h
> @@ -0,0 +1,84 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef SELFTEST_RISCV_CFI_H
> +#define SELFTEST_RISCV_CFI_H
> +#include <stddef.h>
> +#include <sys/types.h>
> +#include "shadowstack.h"
> +
> +#define RISCV_CFI_SELFTEST_COUNT RISCV_SHADOW_STACK_TESTS
> +
> +#define CHILD_EXIT_CODE_SSWRITE                10
> +#define CHILD_EXIT_CODE_SIG_TEST       11
> +
> +#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5)                 \
> +({                                                                     \
> +       register long _num  __asm__ ("a7") = (num);                     \
> +       register long _arg1 __asm__ ("a0") = (long)(arg1);              \
> +       register long _arg2 __asm__ ("a1") = (long)(arg2);              \
> +       register long _arg3 __asm__ ("a2") = (long)(arg3);              \
> +       register long _arg4 __asm__ ("a3") = (long)(arg4);              \
> +       register long _arg5 __asm__ ("a4") = (long)(arg5);              \
> +                                                                       \
> +       __asm__ volatile(                                               \
> +               "ecall\n"                                               \
> +               : "+r"                                                  \
> +               (_arg1)                                                 \
> +               : "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5),       \
> +                 "r"(_num)                                             \
> +               : "memory", "cc"                                        \
> +       );                                                              \
> +       _arg1;                                                          \
> +})
> +
> +#define my_syscall3(num, arg1, arg2, arg3)                             \
> +({                                                                     \
> +       register long _num  __asm__ ("a7") = (num);                     \
> +       register long _arg1 __asm__ ("a0") = (long)(arg1);              \
> +       register long _arg2 __asm__ ("a1") = (long)(arg2);              \
> +       register long _arg3 __asm__ ("a2") = (long)(arg3);              \
> +                                                                       \
> +       __asm__ volatile(                                               \
> +               "ecall\n"                                               \
> +               : "+r" (_arg1)                                          \
> +               : "r"(_arg2), "r"(_arg3),                               \
> +                 "r"(_num)                                             \
> +               : "memory", "cc"                                        \
> +       );                                                              \
> +       _arg1;                                                          \
> +})
> +
> +#ifndef __NR_prctl
> +#define __NR_prctl 167
> +#endif
> +
> +#ifndef __NR_map_shadow_stack
> +#define __NR_map_shadow_stack 453
> +#endif
> +
> +#define CSR_SSP 0x011
> +
> +#ifdef __ASSEMBLY__
> +#define __ASM_STR(x)    x
> +#else
> +#define __ASM_STR(x)    #x
> +#endif
> +
> +#define csr_read(csr)                                                  \
> +({                                                                     \
> +       register unsigned long __v;                                     \
> +       __asm__ __volatile__ ("csrr %0, " __ASM_STR(csr)                \
> +                               : "=r" (__v) :                          \
> +                               : "memory");                            \
> +       __v;                                                            \
> +})
> +
> +#define csr_write(csr, val)                                            \
> +({                                                                     \
> +       unsigned long __v = (unsigned long) (val);                      \
> +       __asm__ __volatile__ ("csrw " __ASM_STR(csr) ", %0"             \
> +                               : : "rK" (__v)                          \
> +                               : "memory");                            \
> +})
> +
> +#endif
> diff --git a/tools/testing/selftests/riscv/cfi/riscv_cfi_test.c b/tools/testing/selftests/riscv/cfi/riscv_cfi_test.c
> new file mode 100644
> index 000000000000..720a001f7c31
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/cfi/riscv_cfi_test.c
> @@ -0,0 +1,78 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include "../../kselftest.h"
> +#include <signal.h>
> +#include <asm/ucontext.h>
> +#include <linux/prctl.h>
> +#include "cfi_rv_test.h"
> +
> +/* do not optimize cfi related test functions */
> +#pragma GCC push_options
> +#pragma GCC optimize("O0")
> +
> +void sigsegv_handler(int signum, siginfo_t *si, void *uc)
> +{
> +       struct ucontext *ctx = (struct ucontext *) uc;
> +
> +       if (si->si_code == SEGV_CPERR) {

Hi Deepak,
I got some errors when building this test, I suppose they should be
fixed in the next version.

riscv_cfi_test.c: In function 'sigsegv_handler':
riscv_cfi_test.c:17:28: error: 'SEGV_CPERR' undeclared (first use in
this function); did you mean 'SEGV_ACCERR'?
   17 |         if (si->si_code == SEGV_CPERR) {
      |                            ^~~~~~~~~~
      |                            SEGV_ACCERR


> +               ksft_print_msg("Control flow violation happened somewhere\n");
> +               ksft_print_msg("PC where violation happened %lx\n", ctx->uc_mcontext.gregs[0]);
> +               exit(-1);
> +       }
> +
> +       /* all other cases are expected to be of shadow stack write case */
> +       exit(CHILD_EXIT_CODE_SSWRITE);
> +}
> +
> +bool register_signal_handler(void)
> +{
> +       struct sigaction sa = {};
> +
> +       sa.sa_sigaction = sigsegv_handler;
> +       sa.sa_flags = SA_SIGINFO;
> +       if (sigaction(SIGSEGV, &sa, NULL)) {
> +               ksft_print_msg("Registering signal handler for landing pad violation failed\n");
> +               return false;
> +       }
> +
> +       return true;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +       int ret = 0;
> +       unsigned long lpad_status = 0, ss_status = 0;
> +
> +       ksft_print_header();
> +
> +       ksft_print_msg("Starting risc-v tests\n");
> +
> +       /*
> +        * Landing pad test. Not a lot of kernel changes to support landing
> +        * pad for user mode except lighting up a bit in senvcfg via a prctl
> +        * Enable landing pad through out the execution of test binary
> +        */
> +       ret = my_syscall5(__NR_prctl, PR_GET_INDIR_BR_LP_STATUS, &lpad_status, 0, 0, 0);
> +       if (ret)
> +               ksft_exit_fail_msg("Get landing pad status failed with %d\n", ret);
> +
> +       if (!(lpad_status & PR_INDIR_BR_LP_ENABLE))
> +               ksft_exit_fail_msg("Landing pad is not enabled, should be enabled via glibc\n");
> +
> +       ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, &ss_status, 0, 0, 0);
> +       if (ret)
> +               ksft_exit_fail_msg("Get shadow stack failed with %d\n", ret);
> +
> +       if (!(ss_status & PR_SHADOW_STACK_ENABLE))
> +               ksft_exit_fail_msg("Shadow stack is not enabled, should be enabled via glibc\n");
> +
> +       if (!register_signal_handler())
> +               ksft_exit_fail_msg("Registering signal handler for SIGSEGV failed\n");
> +
> +       ksft_print_msg("Landing pad and shadow stack are enabled for binary\n");
> +       execute_shadow_stack_tests();
> +
> +       return 0;
> +}
> +
> +#pragma GCC pop_options
> diff --git a/tools/testing/selftests/riscv/cfi/shadowstack.c b/tools/testing/selftests/riscv/cfi/shadowstack.c
> new file mode 100644
> index 000000000000..9d5301914578
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/cfi/shadowstack.c
> @@ -0,0 +1,373 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include "../../kselftest.h"
> +#include <sys/wait.h>
> +#include <signal.h>
> +#include <fcntl.h>
> +#include <asm-generic/unistd.h>
> +#include <sys/mman.h>
> +#include "shadowstack.h"
> +#include "cfi_rv_test.h"
> +
> +/* do not optimize shadow stack related test functions */
> +#pragma GCC push_options
> +#pragma GCC optimize("O0")
> +
> +void zar(void)
> +{
> +       unsigned long ssp = 0;
> +
> +       ssp = csr_read(CSR_SSP);
> +       ksft_print_msg("Spewing out shadow stack ptr: %lx\n"
> +                       "  This is to ensure shadow stack is indeed enabled and working\n",
> +                       ssp);
> +}
> +
> +void bar(void)
> +{
> +       zar();
> +}
> +
> +void foo(void)
> +{
> +       bar();
> +}
> +
> +void zar_child(void)
> +{
> +       unsigned long ssp = 0;
> +
> +       ssp = csr_read(CSR_SSP);
> +       ksft_print_msg("Spewing out shadow stack ptr: %lx\n"
> +                       "  This is to ensure shadow stack is indeed enabled and working\n",
> +                       ssp);
> +}
> +
> +void bar_child(void)
> +{
> +       zar_child();
> +}
> +
> +void foo_child(void)
> +{
> +       bar_child();
> +}
> +
> +typedef void (call_func_ptr)(void);
> +/*
> + * call couple of functions to test push pop.
> + */
> +int shadow_stack_call_tests(call_func_ptr fn_ptr, bool parent)
> +{
> +       ksft_print_msg("Exercising dummy calls for sspush and sspopchk in"
> +                       " context of %s\n", parent ? "parent" : "child");
> +
> +       (fn_ptr)();
> +
> +       return 0;
> +}
> +
> +/* forks a thread, and ensure shadow stacks fork out */
> +bool shadow_stack_fork_test(unsigned long test_num, void *ctx)
> +{
> +       int pid = 0, child_status = 0, parent_pid = 0, ret = 0;
> +       unsigned long ss_status = 0;
> +
> +       ksft_print_msg("Exercising shadow stack fork test\n");
> +
> +       ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, &ss_status, 0, 0, 0);
> +       if (ret) {
> +               ksft_exit_skip("Shadow stack get status prctl failed with errorcode %d\n", ret);
> +               return false;
> +       }
> +
> +       if (!(ss_status & PR_SHADOW_STACK_ENABLE))
> +               ksft_exit_skip("Shadow stack is not enabled, should be enabled via glibc\n");
> +
> +       parent_pid = getpid();
> +       pid = fork();
> +
> +       if (pid) {
> +               ksft_print_msg("Parent pid %d and child pid %d\n", parent_pid, pid);
> +               shadow_stack_call_tests(&foo, true);
> +       } else
> +               shadow_stack_call_tests(&foo_child, false);
> +
> +       if (pid) {
> +               ksft_print_msg("Waiting on child to finish\n");
> +               wait(&child_status);
> +       } else {
> +               /* exit child gracefully */
> +               exit(0);
> +       }
> +
> +       if (pid && WIFSIGNALED(child_status)) {
> +               ksft_print_msg("Child faulted, fork test failed\n");
> +               return false;
> +       }
> +
> +       return true;
> +}
> +
> +/* exercise `map_shadow_stack`, pivot to it and call some functions to ensure it works */
> +#define SHADOW_STACK_ALLOC_SIZE 4096
> +bool shadow_stack_map_test(unsigned long test_num, void *ctx)
> +{
> +       unsigned long shdw_addr;
> +       int ret = 0;
> +
> +       ksft_print_msg("Exercising shadow stack map test\n");
> +
> +       shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
> +
> +       if (((long) shdw_addr) <= 0) {
> +               ksft_print_msg("map_shadow_stack failed with error code %d\n", (int) shdw_addr);
> +               return false;
> +       }
> +
> +       ret = munmap((void *) shdw_addr, SHADOW_STACK_ALLOC_SIZE);
> +
> +       if (ret) {
> +               ksft_print_msg("munmap failed with error code %d\n", ret);
> +               return false;
> +       }
> +
> +       return true;
> +}
> +
> +/*
> + * shadow stack protection tests. map a shadow stack and
> + * validate all memory protections work on it
> + */
> +bool shadow_stack_protection_test(unsigned long test_num, void *ctx)
> +{
> +       unsigned long shdw_addr;
> +       unsigned long *write_addr = NULL;
> +       int ret = 0, pid = 0, child_status = 0;
> +
> +       ksft_print_msg("Exercising shadow stack protection test\n");
> +
> +       shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
> +
> +       if (((long) shdw_addr) <= 0) {
> +               ksft_print_msg("map_shadow_stack failed with error code %d\n", (int) shdw_addr);
> +               return false;
> +       }
> +
> +       write_addr = (unsigned long *) shdw_addr;
> +       pid = fork();
> +
> +       /* no child was created, return false */
> +       if (pid == -1)
> +               return false;
> +
> +       /*
> +        * try to perform a store from child on shadow stack memory
> +        * it should result in SIGSEGV
> +        */
> +       if (!pid) {
> +               /* below write must lead to SIGSEGV */
> +               *write_addr = 0xdeadbeef;
> +       } else {
> +               wait(&child_status);
> +       }
> +
> +       /* test fail, if 0xdeadbeef present on shadow stack address */
> +       if (*write_addr == 0xdeadbeef) {
> +               ksft_print_msg("Write suceeded on shadow stack memory, shadow stack protection test"
> +               " failed\n");
> +               return false;
> +       }
> +
> +       /* if child reached here, then fail */
> +       if (!pid) {
> +               ksft_print_msg("Shadow stack protection test: child reached unreachable state\n");
> +               return false;
> +       }
> +
> +       /* if child exited via signal handler but not for write on ss */
> +       if (WIFEXITED(child_status) &&
> +               WEXITSTATUS(child_status) != CHILD_EXIT_CODE_SSWRITE) {
> +               ksft_print_msg("Shadow stack protection test: child wasn't signaled for write on"
> +               " shadow stack\n");
> +               return false;
> +       }
> +
> +       ret = munmap(write_addr, SHADOW_STACK_ALLOC_SIZE);
> +       if (ret) {
> +               ksft_print_msg("Shadow stack protection test: munmap failed with error code %d\n",
> +               ret);
> +               return false;
> +       }
> +
> +       return true;
> +}
> +
> +#define SS_MAGIC_WRITE_VAL 0xbeefdead
> +
> +int gup_tests(int mem_fd, unsigned long *shdw_addr)
> +{
> +       unsigned long val = 0;
> +
> +       lseek(mem_fd, (unsigned long)shdw_addr, SEEK_SET);
> +       if (read(mem_fd, &val, sizeof(val)) < 0) {
> +               ksft_print_msg("Reading shadow stack mem via gup failed\n");
> +               return 1;
> +       }
> +
> +       val = SS_MAGIC_WRITE_VAL;
> +       lseek(mem_fd, (unsigned long)shdw_addr, SEEK_SET);
> +       if (write(mem_fd, &val, sizeof(val)) < 0) {
> +               ksft_print_msg("Writing shadow stack mem via gup failed\n");
> +               return 1;
> +       }
> +
> +       if (*shdw_addr != SS_MAGIC_WRITE_VAL) {
> +               ksft_print_msg("GUP write to shadow stack memory failed\n");
> +               return 1;
> +       }
> +
> +       return 0;
> +}
> +
> +bool shadow_stack_gup_tests(unsigned long test_num, void *ctx)
> +{
> +       unsigned long shdw_addr = 0;
> +       unsigned long *write_addr = NULL;
> +       int fd = 0;
> +       bool ret = false;
> +
> +       ksft_print_msg("Exercising shadow stack gup tests\n");
> +       shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
> +
> +       if (((long) shdw_addr) <= 0) {
> +               ksft_print_msg("map_shadow_stack failed with error code %d\n", (int) shdw_addr);
> +               return false;
> +       }
> +
> +       write_addr = (unsigned long *) shdw_addr;
> +
> +       fd = open("/proc/self/mem", O_RDWR);
> +       if (fd == -1)
> +               return false;
> +
> +       if (gup_tests(fd, write_addr)) {
> +               ksft_print_msg("gup tests failed\n");
> +               goto out;
> +       }
> +
> +       ret = true;
> +out:
> +       if (shdw_addr && munmap(write_addr, SHADOW_STACK_ALLOC_SIZE)) {
> +               ksft_print_msg("munmap failed with error code %d\n", ret);
> +               ret = false;
> +       }
> +
> +       return ret;
> +}
> +
> +volatile bool break_loop;
> +
> +void sigusr1_handler(int signo)
> +{
> +       break_loop = true;
> +}
> +
> +bool sigusr1_signal_test(void)
> +{
> +       struct sigaction sa = {};
> +
> +       sa.sa_handler = sigusr1_handler;
> +       sa.sa_flags = 0;
> +       sigemptyset(&sa.sa_mask);
> +       if (sigaction(SIGUSR1, &sa, NULL)) {
> +               ksft_print_msg("Registering signal handler for SIGUSR1 failed\n");
> +               return false;
> +       }
> +
> +       return true;
> +}
> +/*
> + * shadow stack signal test. shadow stack must be enabled.
> + * register a signal, fork another thread which is waiting
> + * on signal. Send a signal from parent to child, verify
> + * that signal was received by child. If not test fails
> + */
> +bool shadow_stack_signal_test(unsigned long test_num, void *ctx)
> +{
> +       int pid = 0, child_status = 0, ret = 0;
> +       unsigned long ss_status = 0;
> +
> +       ksft_print_msg("Exercising shadow stack signal test\n");
> +
> +       ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, &ss_status, 0, 0, 0);
> +       if (ret) {
> +               ksft_print_msg("Shadow stack get status prctl failed with errorcode %d\n", ret);
> +               return false;
> +       }
> +
> +       if (!(ss_status & PR_SHADOW_STACK_ENABLE))
> +               ksft_print_msg("Shadow stack is not enabled, should be enabled via glibc\n");
> +
> +       /* this should be caught by signal handler and do an exit */
> +       if (!sigusr1_signal_test()) {
> +               ksft_print_msg("Registering sigusr1 handler failed\n");
> +               exit(-1);
> +       }
> +
> +       pid = fork();
> +
> +       if (pid == -1) {
> +               ksft_print_msg("Signal test: fork failed\n");
> +               goto out;
> +       }
> +
> +       if (pid == 0) {
> +               while (!break_loop)
> +                       sleep(1);
> +
> +               exit(11);
> +               /* child shouldn't go beyond here */
> +       }
> +
> +       /* send SIGUSR1 to child */
> +       kill(pid, SIGUSR1);
> +       wait(&child_status);
> +
> +out:
> +
> +       return (WIFEXITED(child_status) &&
> +                       WEXITSTATUS(child_status) == 11);
> +}
> +
> +int execute_shadow_stack_tests(void)
> +{
> +       int ret = 0;
> +       unsigned long test_count = 0;
> +       unsigned long shstk_status = 0;
> +       bool test_pass = false;
> +
> +       ksft_print_msg("Executing RISC-V shadow stack self tests\n");
> +       ksft_set_plan(RISCV_SHADOW_STACK_TESTS);
> +
> +       ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, &shstk_status, 0, 0, 0);
> +
> +       if (ret != 0)
> +               ksft_exit_fail_msg("Get shadow stack status failed with %d\n", ret);
> +
> +       /*
> +        * If we are here that means get shadow stack status succeeded and
> +        * thus shadow stack support is baked in the kernel.
> +        */
> +       while (test_count < ARRAY_SIZE(shstk_tests)) {
> +               test_pass = (*shstk_tests[test_count].t_func)(test_count, NULL);
> +               ksft_test_result(test_pass, shstk_tests[test_count].name);
> +               test_count++;
> +       }
> +
> +       ksft_finished();
> +
> +       return 0;
> +}
> +
> +#pragma GCC pop_options
> diff --git a/tools/testing/selftests/riscv/cfi/shadowstack.h b/tools/testing/selftests/riscv/cfi/shadowstack.h
> new file mode 100644
> index 000000000000..b43e74136a26
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/cfi/shadowstack.h
> @@ -0,0 +1,37 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef SELFTEST_SHADOWSTACK_TEST_H
> +#define SELFTEST_SHADOWSTACK_TEST_H
> +#include <stddef.h>
> +#include <linux/prctl.h>
> +
> +/*
> + * a cfi test returns true for success or false for fail
> + * takes a number for test number to index into array and void pointer.
> + */
> +typedef bool (*shstk_test_func)(unsigned long test_num, void *);
> +
> +struct shadow_stack_tests {
> +       char *name;
> +       shstk_test_func t_func;
> +};
> +
> +bool shadow_stack_fork_test(unsigned long test_num, void *ctx);
> +bool shadow_stack_map_test(unsigned long test_num, void *ctx);
> +bool shadow_stack_protection_test(unsigned long test_num, void *ctx);
> +bool shadow_stack_gup_tests(unsigned long test_num, void *ctx);
> +bool shadow_stack_signal_test(unsigned long test_num, void *ctx);
> +
> +static struct shadow_stack_tests shstk_tests[] = {

shadowstack.h:25:34: warning: 'shstk_tests' defined but not used
[-Wunused-variable]
   25 | static struct shadow_stack_tests shstk_tests[] = {

> +       { "shstk fork test\n", shadow_stack_fork_test },
> +       { "map shadow stack syscall\n", shadow_stack_map_test },
> +       { "shadow stack gup tests\n", shadow_stack_gup_tests },
> +       { "shadow stack signal tests\n", shadow_stack_signal_test},
> +       { "memory protections of shadow stack memory\n", shadow_stack_protection_test }
> +};
> +
> +#define RISCV_SHADOW_STACK_TESTS ARRAY_SIZE(shstk_tests)
> +
> +int execute_shadow_stack_tests(void);
> +
> +#endif
>
> --
> 2.45.0
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv
Mark Brown Oct. 11, 2024, 10:18 a.m. UTC | #2 
On Fri, Oct 11, 2024 at 01:44:55PM +0800, Zong Li wrote:
> On Wed, Oct 9, 2024 at 7:46 AM Deepak Gupta <debug@rivosinc.com> wrote:

> > +       if (si->si_code == SEGV_CPERR) {

> Hi Deepak,
> I got some errors when building this test, I suppose they should be
> fixed in the next version.

> riscv_cfi_test.c: In function 'sigsegv_handler':
> riscv_cfi_test.c:17:28: error: 'SEGV_CPERR' undeclared (first use in
> this function); did you mean 'SEGV_ACCERR'?
>    17 |         if (si->si_code == SEGV_CPERR) {
>       |                            ^~~~~~~~~~
>       |                            SEGV_ACCERR
> 

Did you run "make headers_install" prior to building kselftest to get
the current kernel's headers available for userspace builds?
Zong Li Oct. 11, 2024, 11:43 a.m. UTC | #3 
On Fri, Oct 11, 2024 at 6:18 PM Mark Brown <broonie@kernel.org> wrote:
>
> On Fri, Oct 11, 2024 at 01:44:55PM +0800, Zong Li wrote:
> > On Wed, Oct 9, 2024 at 7:46 AM Deepak Gupta <debug@rivosinc.com> wrote:
>
> > > +       if (si->si_code == SEGV_CPERR) {
>
> > Hi Deepak,
> > I got some errors when building this test, I suppose they should be
> > fixed in the next version.
>
> > riscv_cfi_test.c: In function 'sigsegv_handler':
> > riscv_cfi_test.c:17:28: error: 'SEGV_CPERR' undeclared (first use in
> > this function); did you mean 'SEGV_ACCERR'?
> >    17 |         if (si->si_code == SEGV_CPERR) {
> >       |                            ^~~~~~~~~~
> >       |                            SEGV_ACCERR
> >
>
> Did you run "make headers_install" prior to building kselftest to get
> the current kernel's headers available for userspace builds?

Yes, I have run "make header" and "make header_install" before
building the kselftest. This error happens when I cross compiled it,
perhaps I can help to check if it is missing some header files or
header search path.
Deepak Gupta Oct. 11, 2024, 7:45 p.m. UTC | #4 
On Fri, Oct 11, 2024 at 07:43:30PM +0800, Zong Li wrote:
>On Fri, Oct 11, 2024 at 6:18 PM Mark Brown <broonie@kernel.org> wrote:
>>
>> On Fri, Oct 11, 2024 at 01:44:55PM +0800, Zong Li wrote:
>> > On Wed, Oct 9, 2024 at 7:46 AM Deepak Gupta <debug@rivosinc.com> wrote:
>>
>> > > +       if (si->si_code == SEGV_CPERR) {
>>
>> > Hi Deepak,
>> > I got some errors when building this test, I suppose they should be
>> > fixed in the next version.
>>
>> > riscv_cfi_test.c: In function 'sigsegv_handler':
>> > riscv_cfi_test.c:17:28: error: 'SEGV_CPERR' undeclared (first use in
>> > this function); did you mean 'SEGV_ACCERR'?
>> >    17 |         if (si->si_code == SEGV_CPERR) {
>> >       |                            ^~~~~~~~~~
>> >       |                            SEGV_ACCERR
>> >
>>
>> Did you run "make headers_install" prior to building kselftest to get
>> the current kernel's headers available for userspace builds?
>
>Yes, I have run "make header" and "make header_install" before
>building the kselftest. This error happens when I cross compiled it,
>perhaps I can help to check if it is missing some header files or
>header search path.

That's wierd.

It doesn't fail for me even if I do not do `make headers_install`. But I am
building kernel and selftests with toolchain which supports shadow stack and
landing pad. It's defined in `siginfo.h`. When I built toolchain, I did point
it at the latest kernel headers. May be that's the trick.

"""

$ grep -nir SEGV_CPERR /scratch/debug/linux/kbuild/usr/include/*
/scratch/debug/linux/kbuild/usr/include/asm-generic/siginfo.h:240:#define SEGV_CPERR    10      /* Control protection fault */

$ grep -nir SEGV_CPERR /scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/*
/scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/asm-generic/siginfo.h:240:#define SEGV_CPERR    10      /* Control protection fault */
/scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/bits/siginfo-consts.h:139:  SEGV_CPERR                  /* Control protection fault.  */
/scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/bits/siginfo-consts.h:140:#  define SEGV_CPERR  SEGV_CPERR

"""
Zong Li Oct. 14, 2024, 2:33 p.m. UTC | #5 
On Sat, Oct 12, 2024 at 3:46 AM Deepak Gupta <debug@rivosinc.com> wrote:
>
> On Fri, Oct 11, 2024 at 07:43:30PM +0800, Zong Li wrote:
> >On Fri, Oct 11, 2024 at 6:18 PM Mark Brown <broonie@kernel.org> wrote:
> >>
> >> On Fri, Oct 11, 2024 at 01:44:55PM +0800, Zong Li wrote:
> >> > On Wed, Oct 9, 2024 at 7:46 AM Deepak Gupta <debug@rivosinc.com> wrote:
> >>
> >> > > +       if (si->si_code == SEGV_CPERR) {
> >>
> >> > Hi Deepak,
> >> > I got some errors when building this test, I suppose they should be
> >> > fixed in the next version.
> >>
> >> > riscv_cfi_test.c: In function 'sigsegv_handler':
> >> > riscv_cfi_test.c:17:28: error: 'SEGV_CPERR' undeclared (first use in
> >> > this function); did you mean 'SEGV_ACCERR'?
> >> >    17 |         if (si->si_code == SEGV_CPERR) {
> >> >       |                            ^~~~~~~~~~
> >> >       |                            SEGV_ACCERR
> >> >
> >>
> >> Did you run "make headers_install" prior to building kselftest to get
> >> the current kernel's headers available for userspace builds?
> >
> >Yes, I have run "make header" and "make header_install" before
> >building the kselftest. This error happens when I cross compiled it,
> >perhaps I can help to check if it is missing some header files or
> >header search path.
>
> That's wierd.
>
> It doesn't fail for me even if I do not do `make headers_install`. But I am
> building kernel and selftests with toolchain which supports shadow stack and
> landing pad. It's defined in `siginfo.h`. When I built toolchain, I did point
> it at the latest kernel headers. May be that's the trick.
>
> """
>
> $ grep -nir SEGV_CPERR /scratch/debug/linux/kbuild/usr/include/*
> /scratch/debug/linux/kbuild/usr/include/asm-generic/siginfo.h:240:#define SEGV_CPERR    10      /* Control protection fault */
>
> $ grep -nir SEGV_CPERR /scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/*
> /scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/asm-generic/siginfo.h:240:#define SEGV_CPERR    10      /* Control protection fault */
> /scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/bits/siginfo-consts.h:139:  SEGV_CPERR                  /* Control protection fault.  */
> /scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/bits/siginfo-consts.h:140:#  define SEGV_CPERR  SEGV_CPERR
>
> """

In my case, because the test files don't explicitly include siginfo.h,
I assume it's expected that siginfo.h will be included through
signal.h. Regarding the header search path, it will eventually locate
signal.h in toolchain_path/sysroot/usr/include/. In my
toolchain_path/sysroot/usr/include/signal.h, it doesn't include any
signal.h; instead, signal.h will be included from
toolchain_path/sysroot/usr/include/linux/signal.h or
kernel_src/usr/include/linux/signal.h rather than
toolchain/sysroot/usr/include/signal.h. I think that is why I lost the
SEGV_CPERR definition. Is there any difference with you?

>
diff mbox series

Patch

diff --git a/tools/testing/selftests/riscv/Makefile b/tools/testing/selftests/riscv/Makefile
index 7ce03d832b64..6e142fe004ab 100644
--- a/tools/testing/selftests/riscv/Makefile
+++ b/tools/testing/selftests/riscv/Makefile
@@ -5,7 +5,7 @@ 
 ARCH ?= $(shell uname -m 2>/dev/null || echo not)
 
 ifneq (,$(filter $(ARCH),riscv))
-RISCV_SUBTARGETS ?= hwprobe vector mm sigreturn
+RISCV_SUBTARGETS ?= hwprobe vector mm sigreturn cfi
 else
 RISCV_SUBTARGETS :=
 endif
diff --git a/tools/testing/selftests/riscv/cfi/.gitignore b/tools/testing/selftests/riscv/cfi/.gitignore
new file mode 100644
index 000000000000..82545863bac6
--- /dev/null
+++ b/tools/testing/selftests/riscv/cfi/.gitignore
@@ -0,0 +1,3 @@ 
+cfitests
+riscv_cfi_test
+shadowstack
diff --git a/tools/testing/selftests/riscv/cfi/Makefile b/tools/testing/selftests/riscv/cfi/Makefile
new file mode 100644
index 000000000000..b65f7ff38a32
--- /dev/null
+++ b/tools/testing/selftests/riscv/cfi/Makefile
@@ -0,0 +1,10 @@ 
+CFLAGS += -I$(top_srcdir)/tools/include
+
+CFLAGS += -march=rv64gc_zicfilp_zicfiss
+
+TEST_GEN_PROGS := cfitests
+
+include ../../lib.mk
+
+$(OUTPUT)/cfitests: riscv_cfi_test.c shadowstack.c
+	$(CC) -o$@ $(CFLAGS) $(LDFLAGS) $^
diff --git a/tools/testing/selftests/riscv/cfi/cfi_rv_test.h b/tools/testing/selftests/riscv/cfi/cfi_rv_test.h
new file mode 100644
index 000000000000..0fefdc33f71e
--- /dev/null
+++ b/tools/testing/selftests/riscv/cfi/cfi_rv_test.h
@@ -0,0 +1,84 @@ 
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SELFTEST_RISCV_CFI_H
+#define SELFTEST_RISCV_CFI_H
+#include <stddef.h>
+#include <sys/types.h>
+#include "shadowstack.h"
+
+#define RISCV_CFI_SELFTEST_COUNT RISCV_SHADOW_STACK_TESTS
+
+#define CHILD_EXIT_CODE_SSWRITE		10
+#define CHILD_EXIT_CODE_SIG_TEST	11
+
+#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5)			\
+({									\
+	register long _num  __asm__ ("a7") = (num);			\
+	register long _arg1 __asm__ ("a0") = (long)(arg1);		\
+	register long _arg2 __asm__ ("a1") = (long)(arg2);		\
+	register long _arg3 __asm__ ("a2") = (long)(arg3);		\
+	register long _arg4 __asm__ ("a3") = (long)(arg4);		\
+	register long _arg5 __asm__ ("a4") = (long)(arg5);		\
+									\
+	__asm__ volatile(						\
+		"ecall\n"						\
+		: "+r"							\
+		(_arg1)							\
+		: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5),	\
+		  "r"(_num)						\
+		: "memory", "cc"					\
+	);								\
+	_arg1;								\
+})
+
+#define my_syscall3(num, arg1, arg2, arg3)				\
+({									\
+	register long _num  __asm__ ("a7") = (num);			\
+	register long _arg1 __asm__ ("a0") = (long)(arg1);		\
+	register long _arg2 __asm__ ("a1") = (long)(arg2);		\
+	register long _arg3 __asm__ ("a2") = (long)(arg3);		\
+									\
+	__asm__ volatile(						\
+		"ecall\n"						\
+		: "+r" (_arg1)						\
+		: "r"(_arg2), "r"(_arg3),				\
+		  "r"(_num)						\
+		: "memory", "cc"					\
+	);								\
+	_arg1;								\
+})
+
+#ifndef __NR_prctl
+#define __NR_prctl 167
+#endif
+
+#ifndef __NR_map_shadow_stack
+#define __NR_map_shadow_stack 453
+#endif
+
+#define CSR_SSP 0x011
+
+#ifdef __ASSEMBLY__
+#define __ASM_STR(x)    x
+#else
+#define __ASM_STR(x)    #x
+#endif
+
+#define csr_read(csr)							\
+({									\
+	register unsigned long __v;					\
+	__asm__ __volatile__ ("csrr %0, " __ASM_STR(csr)		\
+				: "=r" (__v) :				\
+				: "memory");				\
+	__v;								\
+})
+
+#define csr_write(csr, val)						\
+({									\
+	unsigned long __v = (unsigned long) (val);			\
+	__asm__ __volatile__ ("csrw " __ASM_STR(csr) ", %0"		\
+				: : "rK" (__v)				\
+				: "memory");				\
+})
+
+#endif
diff --git a/tools/testing/selftests/riscv/cfi/riscv_cfi_test.c b/tools/testing/selftests/riscv/cfi/riscv_cfi_test.c
new file mode 100644
index 000000000000..720a001f7c31
--- /dev/null
+++ b/tools/testing/selftests/riscv/cfi/riscv_cfi_test.c
@@ -0,0 +1,78 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "../../kselftest.h"
+#include <signal.h>
+#include <asm/ucontext.h>
+#include <linux/prctl.h>
+#include "cfi_rv_test.h"
+
+/* do not optimize cfi related test functions */
+#pragma GCC push_options
+#pragma GCC optimize("O0")
+
+void sigsegv_handler(int signum, siginfo_t *si, void *uc)
+{
+	struct ucontext *ctx = (struct ucontext *) uc;
+
+	if (si->si_code == SEGV_CPERR) {
+		ksft_print_msg("Control flow violation happened somewhere\n");
+		ksft_print_msg("PC where violation happened %lx\n", ctx->uc_mcontext.gregs[0]);
+		exit(-1);
+	}
+
+	/* all other cases are expected to be of shadow stack write case */
+	exit(CHILD_EXIT_CODE_SSWRITE);
+}
+
+bool register_signal_handler(void)
+{
+	struct sigaction sa = {};
+
+	sa.sa_sigaction = sigsegv_handler;
+	sa.sa_flags = SA_SIGINFO;
+	if (sigaction(SIGSEGV, &sa, NULL)) {
+		ksft_print_msg("Registering signal handler for landing pad violation failed\n");
+		return false;
+	}
+
+	return true;
+}
+
+int main(int argc, char *argv[])
+{
+	int ret = 0;
+	unsigned long lpad_status = 0, ss_status = 0;
+
+	ksft_print_header();
+
+	ksft_print_msg("Starting risc-v tests\n");
+
+	/*
+	 * Landing pad test. Not a lot of kernel changes to support landing
+	 * pad for user mode except lighting up a bit in senvcfg via a prctl
+	 * Enable landing pad through out the execution of test binary
+	 */
+	ret = my_syscall5(__NR_prctl, PR_GET_INDIR_BR_LP_STATUS, &lpad_status, 0, 0, 0);
+	if (ret)
+		ksft_exit_fail_msg("Get landing pad status failed with %d\n", ret);
+
+	if (!(lpad_status & PR_INDIR_BR_LP_ENABLE))
+		ksft_exit_fail_msg("Landing pad is not enabled, should be enabled via glibc\n");
+
+	ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, &ss_status, 0, 0, 0);
+	if (ret)
+		ksft_exit_fail_msg("Get shadow stack failed with %d\n", ret);
+
+	if (!(ss_status & PR_SHADOW_STACK_ENABLE))
+		ksft_exit_fail_msg("Shadow stack is not enabled, should be enabled via glibc\n");
+
+	if (!register_signal_handler())
+		ksft_exit_fail_msg("Registering signal handler for SIGSEGV failed\n");
+
+	ksft_print_msg("Landing pad and shadow stack are enabled for binary\n");
+	execute_shadow_stack_tests();
+
+	return 0;
+}
+
+#pragma GCC pop_options
diff --git a/tools/testing/selftests/riscv/cfi/shadowstack.c b/tools/testing/selftests/riscv/cfi/shadowstack.c
new file mode 100644
index 000000000000..9d5301914578
--- /dev/null
+++ b/tools/testing/selftests/riscv/cfi/shadowstack.c
@@ -0,0 +1,373 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "../../kselftest.h"
+#include <sys/wait.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <asm-generic/unistd.h>
+#include <sys/mman.h>
+#include "shadowstack.h"
+#include "cfi_rv_test.h"
+
+/* do not optimize shadow stack related test functions */
+#pragma GCC push_options
+#pragma GCC optimize("O0")
+
+void zar(void)
+{
+	unsigned long ssp = 0;
+
+	ssp = csr_read(CSR_SSP);
+	ksft_print_msg("Spewing out shadow stack ptr: %lx\n"
+			"  This is to ensure shadow stack is indeed enabled and working\n",
+			ssp);
+}
+
+void bar(void)
+{
+	zar();
+}
+
+void foo(void)
+{
+	bar();
+}
+
+void zar_child(void)
+{
+	unsigned long ssp = 0;
+
+	ssp = csr_read(CSR_SSP);
+	ksft_print_msg("Spewing out shadow stack ptr: %lx\n"
+			"  This is to ensure shadow stack is indeed enabled and working\n",
+			ssp);
+}
+
+void bar_child(void)
+{
+	zar_child();
+}
+
+void foo_child(void)
+{
+	bar_child();
+}
+
+typedef void (call_func_ptr)(void);
+/*
+ * call couple of functions to test push pop.
+ */
+int shadow_stack_call_tests(call_func_ptr fn_ptr, bool parent)
+{
+	ksft_print_msg("Exercising dummy calls for sspush and sspopchk in"
+			" context of %s\n", parent ? "parent" : "child");
+
+	(fn_ptr)();
+
+	return 0;
+}
+
+/* forks a thread, and ensure shadow stacks fork out */
+bool shadow_stack_fork_test(unsigned long test_num, void *ctx)
+{
+	int pid = 0, child_status = 0, parent_pid = 0, ret = 0;
+	unsigned long ss_status = 0;
+
+	ksft_print_msg("Exercising shadow stack fork test\n");
+
+	ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, &ss_status, 0, 0, 0);
+	if (ret) {
+		ksft_exit_skip("Shadow stack get status prctl failed with errorcode %d\n", ret);
+		return false;
+	}
+
+	if (!(ss_status & PR_SHADOW_STACK_ENABLE))
+		ksft_exit_skip("Shadow stack is not enabled, should be enabled via glibc\n");
+
+	parent_pid = getpid();
+	pid = fork();
+
+	if (pid) {
+		ksft_print_msg("Parent pid %d and child pid %d\n", parent_pid, pid);
+		shadow_stack_call_tests(&foo, true);
+	} else
+		shadow_stack_call_tests(&foo_child, false);
+
+	if (pid) {
+		ksft_print_msg("Waiting on child to finish\n");
+		wait(&child_status);
+	} else {
+		/* exit child gracefully */
+		exit(0);
+	}
+
+	if (pid && WIFSIGNALED(child_status)) {
+		ksft_print_msg("Child faulted, fork test failed\n");
+		return false;
+	}
+
+	return true;
+}
+
+/* exercise `map_shadow_stack`, pivot to it and call some functions to ensure it works */
+#define SHADOW_STACK_ALLOC_SIZE 4096
+bool shadow_stack_map_test(unsigned long test_num, void *ctx)
+{
+	unsigned long shdw_addr;
+	int ret = 0;
+
+	ksft_print_msg("Exercising shadow stack map test\n");
+
+	shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
+
+	if (((long) shdw_addr) <= 0) {
+		ksft_print_msg("map_shadow_stack failed with error code %d\n", (int) shdw_addr);
+		return false;
+	}
+
+	ret = munmap((void *) shdw_addr, SHADOW_STACK_ALLOC_SIZE);
+
+	if (ret) {
+		ksft_print_msg("munmap failed with error code %d\n", ret);
+		return false;
+	}
+
+	return true;
+}
+
+/*
+ * shadow stack protection tests. map a shadow stack and
+ * validate all memory protections work on it
+ */
+bool shadow_stack_protection_test(unsigned long test_num, void *ctx)
+{
+	unsigned long shdw_addr;
+	unsigned long *write_addr = NULL;
+	int ret = 0, pid = 0, child_status = 0;
+
+	ksft_print_msg("Exercising shadow stack protection test\n");
+
+	shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
+
+	if (((long) shdw_addr) <= 0) {
+		ksft_print_msg("map_shadow_stack failed with error code %d\n", (int) shdw_addr);
+		return false;
+	}
+
+	write_addr = (unsigned long *) shdw_addr;
+	pid = fork();
+
+	/* no child was created, return false */
+	if (pid == -1)
+		return false;
+
+	/*
+	 * try to perform a store from child on shadow stack memory
+	 * it should result in SIGSEGV
+	 */
+	if (!pid) {
+		/* below write must lead to SIGSEGV */
+		*write_addr = 0xdeadbeef;
+	} else {
+		wait(&child_status);
+	}
+
+	/* test fail, if 0xdeadbeef present on shadow stack address */
+	if (*write_addr == 0xdeadbeef) {
+		ksft_print_msg("Write suceeded on shadow stack memory, shadow stack protection test"
+		" failed\n");
+		return false;
+	}
+
+	/* if child reached here, then fail */
+	if (!pid) {
+		ksft_print_msg("Shadow stack protection test: child reached unreachable state\n");
+		return false;
+	}
+
+	/* if child exited via signal handler but not for write on ss */
+	if (WIFEXITED(child_status) &&
+		WEXITSTATUS(child_status) != CHILD_EXIT_CODE_SSWRITE) {
+		ksft_print_msg("Shadow stack protection test: child wasn't signaled for write on"
+		" shadow stack\n");
+		return false;
+	}
+
+	ret = munmap(write_addr, SHADOW_STACK_ALLOC_SIZE);
+	if (ret) {
+		ksft_print_msg("Shadow stack protection test: munmap failed with error code %d\n",
+		ret);
+		return false;
+	}
+
+	return true;
+}
+
+#define SS_MAGIC_WRITE_VAL 0xbeefdead
+
+int gup_tests(int mem_fd, unsigned long *shdw_addr)
+{
+	unsigned long val = 0;
+
+	lseek(mem_fd, (unsigned long)shdw_addr, SEEK_SET);
+	if (read(mem_fd, &val, sizeof(val)) < 0) {
+		ksft_print_msg("Reading shadow stack mem via gup failed\n");
+		return 1;
+	}
+
+	val = SS_MAGIC_WRITE_VAL;
+	lseek(mem_fd, (unsigned long)shdw_addr, SEEK_SET);
+	if (write(mem_fd, &val, sizeof(val)) < 0) {
+		ksft_print_msg("Writing shadow stack mem via gup failed\n");
+		return 1;
+	}
+
+	if (*shdw_addr != SS_MAGIC_WRITE_VAL) {
+		ksft_print_msg("GUP write to shadow stack memory failed\n");
+		return 1;
+	}
+
+	return 0;
+}
+
+bool shadow_stack_gup_tests(unsigned long test_num, void *ctx)
+{
+	unsigned long shdw_addr = 0;
+	unsigned long *write_addr = NULL;
+	int fd = 0;
+	bool ret = false;
+
+	ksft_print_msg("Exercising shadow stack gup tests\n");
+	shdw_addr = my_syscall3(__NR_map_shadow_stack, NULL, SHADOW_STACK_ALLOC_SIZE, 0);
+
+	if (((long) shdw_addr) <= 0) {
+		ksft_print_msg("map_shadow_stack failed with error code %d\n", (int) shdw_addr);
+		return false;
+	}
+
+	write_addr = (unsigned long *) shdw_addr;
+
+	fd = open("/proc/self/mem", O_RDWR);
+	if (fd == -1)
+		return false;
+
+	if (gup_tests(fd, write_addr)) {
+		ksft_print_msg("gup tests failed\n");
+		goto out;
+	}
+
+	ret = true;
+out:
+	if (shdw_addr && munmap(write_addr, SHADOW_STACK_ALLOC_SIZE)) {
+		ksft_print_msg("munmap failed with error code %d\n", ret);
+		ret = false;
+	}
+
+	return ret;
+}
+
+volatile bool break_loop;
+
+void sigusr1_handler(int signo)
+{
+	break_loop = true;
+}
+
+bool sigusr1_signal_test(void)
+{
+	struct sigaction sa = {};
+
+	sa.sa_handler = sigusr1_handler;
+	sa.sa_flags = 0;
+	sigemptyset(&sa.sa_mask);
+	if (sigaction(SIGUSR1, &sa, NULL)) {
+		ksft_print_msg("Registering signal handler for SIGUSR1 failed\n");
+		return false;
+	}
+
+	return true;
+}
+/*
+ * shadow stack signal test. shadow stack must be enabled.
+ * register a signal, fork another thread which is waiting
+ * on signal. Send a signal from parent to child, verify
+ * that signal was received by child. If not test fails
+ */
+bool shadow_stack_signal_test(unsigned long test_num, void *ctx)
+{
+	int pid = 0, child_status = 0, ret = 0;
+	unsigned long ss_status = 0;
+
+	ksft_print_msg("Exercising shadow stack signal test\n");
+
+	ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, &ss_status, 0, 0, 0);
+	if (ret) {
+		ksft_print_msg("Shadow stack get status prctl failed with errorcode %d\n", ret);
+		return false;
+	}
+
+	if (!(ss_status & PR_SHADOW_STACK_ENABLE))
+		ksft_print_msg("Shadow stack is not enabled, should be enabled via glibc\n");
+
+	/* this should be caught by signal handler and do an exit */
+	if (!sigusr1_signal_test()) {
+		ksft_print_msg("Registering sigusr1 handler failed\n");
+		exit(-1);
+	}
+
+	pid = fork();
+
+	if (pid == -1) {
+		ksft_print_msg("Signal test: fork failed\n");
+		goto out;
+	}
+
+	if (pid == 0) {
+		while (!break_loop)
+			sleep(1);
+
+		exit(11);
+		/* child shouldn't go beyond here */
+	}
+
+	/* send SIGUSR1 to child */
+	kill(pid, SIGUSR1);
+	wait(&child_status);
+
+out:
+
+	return (WIFEXITED(child_status) &&
+			WEXITSTATUS(child_status) == 11);
+}
+
+int execute_shadow_stack_tests(void)
+{
+	int ret = 0;
+	unsigned long test_count = 0;
+	unsigned long shstk_status = 0;
+	bool test_pass = false;
+
+	ksft_print_msg("Executing RISC-V shadow stack self tests\n");
+	ksft_set_plan(RISCV_SHADOW_STACK_TESTS);
+
+	ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, &shstk_status, 0, 0, 0);
+
+	if (ret != 0)
+		ksft_exit_fail_msg("Get shadow stack status failed with %d\n", ret);
+
+	/*
+	 * If we are here that means get shadow stack status succeeded and
+	 * thus shadow stack support is baked in the kernel.
+	 */
+	while (test_count < ARRAY_SIZE(shstk_tests)) {
+		test_pass = (*shstk_tests[test_count].t_func)(test_count, NULL);
+		ksft_test_result(test_pass, shstk_tests[test_count].name);
+		test_count++;
+	}
+
+	ksft_finished();
+
+	return 0;
+}
+
+#pragma GCC pop_options
diff --git a/tools/testing/selftests/riscv/cfi/shadowstack.h b/tools/testing/selftests/riscv/cfi/shadowstack.h
new file mode 100644
index 000000000000..b43e74136a26
--- /dev/null
+++ b/tools/testing/selftests/riscv/cfi/shadowstack.h
@@ -0,0 +1,37 @@ 
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SELFTEST_SHADOWSTACK_TEST_H
+#define SELFTEST_SHADOWSTACK_TEST_H
+#include <stddef.h>
+#include <linux/prctl.h>
+
+/*
+ * a cfi test returns true for success or false for fail
+ * takes a number for test number to index into array and void pointer.
+ */
+typedef bool (*shstk_test_func)(unsigned long test_num, void *);
+
+struct shadow_stack_tests {
+	char *name;
+	shstk_test_func t_func;
+};
+
+bool shadow_stack_fork_test(unsigned long test_num, void *ctx);
+bool shadow_stack_map_test(unsigned long test_num, void *ctx);
+bool shadow_stack_protection_test(unsigned long test_num, void *ctx);
+bool shadow_stack_gup_tests(unsigned long test_num, void *ctx);
+bool shadow_stack_signal_test(unsigned long test_num, void *ctx);
+
+static struct shadow_stack_tests shstk_tests[] = {
+	{ "shstk fork test\n", shadow_stack_fork_test },
+	{ "map shadow stack syscall\n", shadow_stack_map_test },
+	{ "shadow stack gup tests\n", shadow_stack_gup_tests },
+	{ "shadow stack signal tests\n", shadow_stack_signal_test},
+	{ "memory protections of shadow stack memory\n", shadow_stack_protection_test }
+};
+
+#define RISCV_SHADOW_STACK_TESTS ARRAY_SIZE(shstk_tests)
+
+int execute_shadow_stack_tests(void);
+
+#endif