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Date: Fri, 4 Mar 2022 13:11:33 +0100
From: Janosch Frank <frankja@...ux.ibm.com>
To: Steffen Eiden <seiden@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc: Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
David Hildenbrand <david@...hat.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>,
Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 3/3] selftests: drivers/s390x: Add uvdevice tests
On 2/23/22 15:48, Steffen Eiden wrote:
> Adds some selftests to test ioctl error paths of the uv-uapi.
> The Kconfig S390_UV_UAPI must be selected and the Ultravisor facility
> must be available. The test can be executed by non-root, however, the
> uvdevice special file /dev/uv must be accessible for reading and
> writing which may imply root privileges.
Acked-by: Janosch Frank <frankja@...ux.ibm.com>
>
> ./test-uv-device
> TAP version 13
> 1..10
> # Starting 10 tests from 4 test cases.
> # RUN uvio_fixture.qui.fault_ioctl_arg ...
> # OK uvio_fixture.qui.fault_ioctl_arg
> ok 1 uvio_fixture.qui.fault_ioctl_arg
> # RUN uvio_fixture.qui.fault_uvio_arg ...
> # OK uvio_fixture.qui.fault_uvio_arg
> ok 2 uvio_fixture.qui.fault_uvio_arg
> # RUN uvio_fixture.qui.inval_ioctl_cb ...
> # OK uvio_fixture.qui.inval_ioctl_cb
> ok 3 uvio_fixture.qui.inval_ioctl_cb
> # RUN uvio_fixture.qui.inval_ioctl_cmd ...
> # OK uvio_fixture.qui.inval_ioctl_cmd
> ok 4 uvio_fixture.qui.inval_ioctl_cmd
> # RUN uvio_fixture.att.fault_ioctl_arg ...
> # OK uvio_fixture.att.fault_ioctl_arg
> ok 5 uvio_fixture.att.fault_ioctl_arg
> # RUN uvio_fixture.att.fault_uvio_arg ...
> # OK uvio_fixture.att.fault_uvio_arg
> ok 6 uvio_fixture.att.fault_uvio_arg
> # RUN uvio_fixture.att.inval_ioctl_cb ...
> # OK uvio_fixture.att.inval_ioctl_cb
> ok 7 uvio_fixture.att.inval_ioctl_cb
> # RUN uvio_fixture.att.inval_ioctl_cmd ...
> # OK uvio_fixture.att.inval_ioctl_cmd
> ok 8 uvio_fixture.att.inval_ioctl_cmd
> # RUN attest_fixture.att_inval_request ...
> # OK attest_fixture.att_inval_request
> ok 9 attest_fixture.att_inval_request
> # RUN attest_fixture.att_inval_addr ...
> # OK attest_fixture.att_inval_addr
> ok 10 attest_fixture.att_inval_addr
> # PASSED: 10 / 10 tests passed.
> # Totals: pass:10 fail:0 xfail:0 xpass:0 skip:0 error:0
>
> Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>
> ---
> MAINTAINERS | 1 +
> tools/testing/selftests/Makefile | 1 +
> tools/testing/selftests/drivers/.gitignore | 1 +
> .../selftests/drivers/s390x/uvdevice/Makefile | 22 ++
> .../selftests/drivers/s390x/uvdevice/config | 1 +
> .../drivers/s390x/uvdevice/test_uvdevice.c | 281 ++++++++++++++++++
> 6 files changed, 307 insertions(+)
> create mode 100644 tools/testing/selftests/drivers/s390x/uvdevice/Makefile
> create mode 100644 tools/testing/selftests/drivers/s390x/uvdevice/config
> create mode 100644 tools/testing/selftests/drivers/s390x/uvdevice/test_uvdevice.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index f32e876f45c2..7fdf0fa006db 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10582,6 +10582,7 @@ F: arch/s390/kernel/uv.c
> F: arch/s390/kvm/
> F: arch/s390/mm/gmap.c
> F: drivers/s390/char/uvdevice.c
> +F: tools/testing/selftests/drivers/s390x/uvdevice/
> F: tools/testing/selftests/kvm/*/s390x/
> F: tools/testing/selftests/kvm/s390x/
>
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index d08fe4cfe811..d454faf936c3 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -10,6 +10,7 @@ TARGETS += core
> TARGETS += cpufreq
> TARGETS += cpu-hotplug
> TARGETS += drivers/dma-buf
> +TARGETS += drivers/s390x/uvdevice
> TARGETS += efivarfs
> TARGETS += exec
> TARGETS += filesystems
> diff --git a/tools/testing/selftests/drivers/.gitignore b/tools/testing/selftests/drivers/.gitignore
> index ca74f2e1c719..09e23b5afa96 100644
> --- a/tools/testing/selftests/drivers/.gitignore
> +++ b/tools/testing/selftests/drivers/.gitignore
> @@ -1,2 +1,3 @@
> # SPDX-License-Identifier: GPL-2.0-only
> /dma-buf/udmabuf
> +/s390x/uvdevice/test_uvdevice
> diff --git a/tools/testing/selftests/drivers/s390x/uvdevice/Makefile b/tools/testing/selftests/drivers/s390x/uvdevice/Makefile
> new file mode 100644
> index 000000000000..5e701d2708d4
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/s390x/uvdevice/Makefile
> @@ -0,0 +1,22 @@
> +include ../../../../../build/Build.include
> +
> +UNAME_M := $(shell uname -m)
> +
> +ifneq ($(UNAME_M),s390x)
> +nothing:
> +.PHONY: all clean run_tests install
> +.SILENT:
> +else
> +
> +TEST_GEN_PROGS := test_uvdevice
> +
> +top_srcdir ?= ../../../../../..
> +KSFT_KHDR_INSTALL := 1
> +khdr_dir = $(top_srcdir)/usr/include
> +LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
> +
> +CFLAGS += -Wall -Werror -static -I$(khdr_dir) -I$(LINUX_TOOL_ARCH_INCLUDE)
> +
> +include ../../../lib.mk
> +
> +endif
> diff --git a/tools/testing/selftests/drivers/s390x/uvdevice/config b/tools/testing/selftests/drivers/s390x/uvdevice/config
> new file mode 100644
> index 000000000000..f28a04b99eff
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/s390x/uvdevice/config
> @@ -0,0 +1 @@
> +CONFIG_S390_UV_UAPI=y
> diff --git a/tools/testing/selftests/drivers/s390x/uvdevice/test_uvdevice.c b/tools/testing/selftests/drivers/s390x/uvdevice/test_uvdevice.c
> new file mode 100644
> index 000000000000..44a6fbefc156
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/s390x/uvdevice/test_uvdevice.c
> @@ -0,0 +1,281 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * selftest for the Ultravisor UAPI device
> + *
> + * Copyright IBM Corp. 2022
> + * Author(s): Steffen Eiden <seiden@...ux.ibm.com>
> + */
> +
> +#include <stdint.h>
> +#include <fcntl.h>
> +#include <errno.h>
> +#include <sys/ioctl.h>
> +#include <sys/mman.h>
> +
> +#include <asm/uvdevice.h>
> +
> +#include "../../../kselftest_harness.h"
> +
> +#define UV_PATH "/dev/uv"
> +#define BUFFER_SIZE 0x200
> +FIXTURE(uvio_fixture) {
> + int uv_fd;
> + struct uvio_ioctl_cb uvio_ioctl;
> + uint8_t buffer[BUFFER_SIZE];
> + __u64 fault_page;
> +};
> +
> +FIXTURE_VARIANT(uvio_fixture) {
> + unsigned long ioctl_cmd;
> + uint32_t arg_size;
> +};
> +
> +FIXTURE_VARIANT_ADD(uvio_fixture, qui) {
> + .ioctl_cmd = UVIO_IOCTL_QUI,
> + .arg_size = BUFFER_SIZE,
> +};
> +
> +FIXTURE_VARIANT_ADD(uvio_fixture, att) {
> + .ioctl_cmd = UVIO_IOCTL_ATT,
> + .arg_size = sizeof(struct uvio_attest),
> +};
> +
> +FIXTURE_SETUP(uvio_fixture)
> +{
> + self->uv_fd = open(UV_PATH, O_ACCMODE);
> +
> + self->uvio_ioctl.argument_addr = (__u64)self->buffer;
> + self->uvio_ioctl.argument_len = variant->arg_size;
> + self->fault_page =
> + (__u64)mmap(NULL, (size_t)getpagesize(), PROT_NONE, MAP_ANONYMOUS, -1, 0);
> +}
> +
> +FIXTURE_TEARDOWN(uvio_fixture)
> +{
> + if (self->uv_fd)
> + close(self->uv_fd);
> + munmap((void *)self->fault_page, (size_t)getpagesize());
> +}
> +
> +TEST_F(uvio_fixture, fault_ioctl_arg)
> +{
> + int rc, errno_cache;
> +
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, NULL);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EFAULT);
> +
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, self->fault_page);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EFAULT);
> +}
> +
> +TEST_F(uvio_fixture, fault_uvio_arg)
> +{
> + int rc, errno_cache;
> +
> + self->uvio_ioctl.argument_addr = 0;
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EFAULT);
> +
> + self->uvio_ioctl.argument_addr = self->fault_page;
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EFAULT);
> +}
> +
> +/*
> + * Test to verify that IOCTLs with invalid values in the ioctl_control block
> + * are rejected.
> + */
> +TEST_F(uvio_fixture, inval_ioctl_cb)
> +{
> + int rc, errno_cache;
> +
> + self->uvio_ioctl.argument_len = 0;
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EINVAL);
> +
> + self->uvio_ioctl.argument_len = (uint32_t)-1;
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EINVAL);
> + self->uvio_ioctl.argument_len = variant->arg_size;
> +
> + self->uvio_ioctl.flags = (uint32_t)-1;
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EINVAL);
> + self->uvio_ioctl.flags = 0;
> +
> + memset(self->uvio_ioctl.reserved14, 0xff, sizeof(self->uvio_ioctl.reserved14));
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EINVAL);
> +
> + memset(&self->uvio_ioctl, 0x11, sizeof(self->uvio_ioctl));
> + rc = ioctl(self->uv_fd, variant->ioctl_cmd, &self->uvio_ioctl);
> + ASSERT_EQ(rc, -1);
> +}
> +
> +TEST_F(uvio_fixture, inval_ioctl_cmd)
> +{
> + int rc, errno_cache;
> + uint8_t nr = _IOC_NR(variant->ioctl_cmd);
> + unsigned long cmds[] = {
> + _IOWR('a', nr, struct uvio_ioctl_cb),
> + _IOWR(UVIO_TYPE_UVC, nr, int),
> + _IO(UVIO_TYPE_UVC, nr),
> + _IOR(UVIO_TYPE_UVC, nr, struct uvio_ioctl_cb),
> + _IOW(UVIO_TYPE_UVC, nr, struct uvio_ioctl_cb),
> + };
> +
> + for (size_t i = 0; i < ARRAY_SIZE(cmds); i++) {
> + rc = ioctl(self->uv_fd, cmds[i], &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, ENOTTY);
> + }
> +}
> +
> +struct test_attest_buffer {
> + uint8_t arcb[0x180];
> + uint8_t meas[64];
> + uint8_t add[32];
> +};
> +
> +FIXTURE(attest_fixture) {
> + int uv_fd;
> + struct uvio_ioctl_cb uvio_ioctl;
> + struct uvio_attest uvio_attest;
> + struct test_attest_buffer attest_buffer;
> + __u64 fault_page;
> +};
> +
> +FIXTURE_SETUP(attest_fixture)
> +{
> + self->uv_fd = open(UV_PATH, O_ACCMODE);
> +
> + self->uvio_ioctl.argument_addr = (__u64)&self->uvio_attest;
> + self->uvio_ioctl.argument_len = sizeof(self->uvio_attest);
> +
> + self->uvio_attest.arcb_addr = (__u64)&self->attest_buffer.arcb;
> + self->uvio_attest.arcb_len = sizeof(self->attest_buffer.arcb);
> +
> + self->uvio_attest.meas_addr = (__u64)&self->attest_buffer.meas;
> + self->uvio_attest.meas_len = sizeof(self->attest_buffer.meas);
> +
> + self->uvio_attest.add_data_addr = (__u64)&self->attest_buffer.add;
> + self->uvio_attest.add_data_len = sizeof(self->attest_buffer.add);
> + self->fault_page =
> + (__u64)mmap(NULL, (size_t)getpagesize(), PROT_NONE, MAP_ANONYMOUS, -1, 0);
> +}
> +
> +FIXTURE_TEARDOWN(attest_fixture)
> +{
> + if (self->uv_fd)
> + close(self->uv_fd);
> + munmap((void *)self->fault_page, (size_t)getpagesize());
> +}
> +
> +static void att_inval_sizes_test(uint32_t *size, uint32_t max_size, bool test_zero,
> + struct __test_metadata *_metadata,
> + FIXTURE_DATA(attest_fixture) *self)
> +{
> + int rc, errno_cache;
> + uint32_t tmp = *size;
> +
> + if (test_zero) {
> + *size = 0;
> + rc = ioctl(self->uv_fd, UVIO_IOCTL_ATT, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EINVAL);
> + }
> + *size = max_size + 1;
> + rc = ioctl(self->uv_fd, UVIO_IOCTL_ATT, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EINVAL);
> + *size = tmp;
> +}
> +
> +/*
> + * Test to verify that attestation IOCTLs with invalid values in the UVIO
> + * attestation control block are rejected.
> + */
> +TEST_F(attest_fixture, att_inval_request)
> +{
> + int rc, errno_cache;
> +
> + att_inval_sizes_test(&self->uvio_attest.add_data_len, UVIO_ATT_ADDITIONAL_MAX_LEN,
> + false, _metadata, self);
> + att_inval_sizes_test(&self->uvio_attest.meas_len, UVIO_ATT_MEASUREMENT_MAX_LEN,
> + true, _metadata, self);
> + att_inval_sizes_test(&self->uvio_attest.arcb_len, UVIO_ATT_ARCB_MAX_LEN,
> + true, _metadata, self);
> +
> + self->uvio_attest.reserved136 = (uint16_t)-1;
> + rc = ioctl(self->uv_fd, UVIO_IOCTL_ATT, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EINVAL);
> +
> + memset(&self->uvio_attest, 0x11, sizeof(self->uvio_attest));
> + rc = ioctl(self->uv_fd, UVIO_IOCTL_ATT, &self->uvio_ioctl);
> + ASSERT_EQ(rc, -1);
> +}
> +
> +static void att_inval_addr_test(__u64 *addr, struct __test_metadata *_metadata,
> + FIXTURE_DATA(attest_fixture) *self)
> +{
> + int rc, errno_cache;
> + __u64 tmp = *addr;
> +
> + *addr = 0;
> + rc = ioctl(self->uv_fd, UVIO_IOCTL_ATT, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EFAULT);
> + *addr = self->fault_page;
> + rc = ioctl(self->uv_fd, UVIO_IOCTL_ATT, &self->uvio_ioctl);
> + errno_cache = errno;
> + ASSERT_EQ(rc, -1);
> + ASSERT_EQ(errno_cache, EFAULT);
> + *addr = tmp;
> +}
> +
> +TEST_F(attest_fixture, att_inval_addr)
> +{
> + att_inval_addr_test(&self->uvio_attest.arcb_addr, _metadata, self);
> + att_inval_addr_test(&self->uvio_attest.add_data_addr, _metadata, self);
> + att_inval_addr_test(&self->uvio_attest.meas_addr, _metadata, self);
> +}
> +
> +static void __attribute__((constructor)) __constructor_order_last(void)
> +{
> + if (!__constructor_order)
> + __constructor_order = _CONSTRUCTOR_ORDER_BACKWARD;
> +}
> +
> +int main(int argc, char **argv)
> +{
> + int fd = open(UV_PATH, O_ACCMODE);
> +
> + if (fd < 0)
> + ksft_exit_skip("No uv-device or cannot access " UV_PATH "\n"
> + "Enable CONFIG_S390_UV_UAPI and check the access rights on "
> + UV_PATH ".\n");
> + close(fd);
> + return test_harness_run(argc, argv);
> +}
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