[PATCH v3 2/3] selftests/powerpc: Add test for real address error handling
From: Ganesh Goudar <hidden>
Date: 2021-09-06 08:44:59
Subsystem:
kernel selftest framework, the rest · Maintainers:
Shuah Khan, Shuah Khan, Linus Torvalds
Add test for real address or control memory address access error handling, using NX-GZIP engine. The error is injected by accessing the control memory address using illegal instruction, on successful handling the process attempting to access control memory address using illegal instruction receives SIGBUS. Signed-off-by: Ganesh Goudar <redacted> --- v3: Avoid using shell script to inject error. v2: Fix build error. --- tools/testing/selftests/powerpc/Makefile | 3 +- tools/testing/selftests/powerpc/mce/Makefile | 7 ++ .../selftests/powerpc/mce/inject-ra-err.c | 65 +++++++++++++++++++ tools/testing/selftests/powerpc/mce/vas-api.h | 1 + 4 files changed, 75 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/mce/Makefile create mode 100644 tools/testing/selftests/powerpc/mce/inject-ra-err.c create mode 120000 tools/testing/selftests/powerpc/mce/vas-api.h
diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile
index 0830e63818c1..4830372d7416 100644
--- a/tools/testing/selftests/powerpc/Makefile
+++ b/tools/testing/selftests/powerpc/Makefile@@ -31,7 +31,8 @@ SUB_DIRS = alignment \ vphn \ math \ ptrace \ - security + security \ + mce endif
diff --git a/tools/testing/selftests/powerpc/mce/Makefile b/tools/testing/selftests/powerpc/mce/Makefile
new file mode 100644
index 000000000000..2424513982d9
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/Makefile@@ -0,0 +1,7 @@ +#SPDX-License-Identifier: GPL-2.0-or-later + +TEST_GEN_PROGS := inject-ra-err + +include ../../lib.mk + +$(TEST_GEN_PROGS): ../harness.c
diff --git a/tools/testing/selftests/powerpc/mce/inject-ra-err.c b/tools/testing/selftests/powerpc/mce/inject-ra-err.c
new file mode 100644
index 000000000000..94323c34d9a6
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/inject-ra-err.c@@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <errno.h> +#include <fcntl.h> +#include <signal.h> +#include <stdio.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +#include "vas-api.h" +#include "utils.h" + +static bool faulted; + +static void sigbus_handler(int n, siginfo_t *info, void *ctxt_v) +{ + ucontext_t *ctxt = (ucontext_t *)ctxt_v; + struct pt_regs *regs = ctxt->uc_mcontext.regs; + + faulted = true; + regs->nip += 4; +} + +static int test_ra_error(void) +{ + struct vas_tx_win_open_attr attr; + int fd, *paste_addr; + char *devname = "/dev/crypto/nx-gzip"; + struct sigaction act = { + .sa_sigaction = sigbus_handler, + .sa_flags = SA_SIGINFO, + }; + + memset(&attr, 0, sizeof(attr)); + attr.version = 1; + attr.vas_id = 0; + + SKIP_IF(access(devname, F_OK)); + + fd = open(devname, O_RDWR); + FAIL_IF(fd < 0); + FAIL_IF(ioctl(fd, VAS_TX_WIN_OPEN, &attr) < 0); + FAIL_IF(sigaction(SIGBUS, &act, NULL) != 0); + + paste_addr = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0ULL); + + /* The following assignment triggers exception */ + mb(); + *paste_addr = 1; + mb(); + + FAIL_IF(!faulted); + + return 0; +} + +int main(void) +{ + return test_harness(test_ra_error, "inject-ra-err"); +} +
diff --git a/tools/testing/selftests/powerpc/mce/vas-api.h b/tools/testing/selftests/powerpc/mce/vas-api.h
new file mode 120000
index 000000000000..1455c1bcd351
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/vas-api.h@@ -0,0 +1 @@ +../../../../../arch/powerpc/include/uapi/asm/vas-api.h
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