| Message ID | 20240725-convert_dev_cgroup-v1-2-2c8cbd487c44@bootlin.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | selftests/bpf: convert test_dev_cgroup to test_progs | expand |
On 07/25, Alexis Lothoré (eBPF Foundation) wrote: > test_dev_cgroup is defined as a standalone test program, and so is not > executed in CI. > > Convert it to test_progs framework so it is tested automatically in CI, and > remove the old test. In order to be able to run it in test_progs, /dev/null > must remain usable, so change the new test to test operations on devices > 1:3 as valid, and operations on devices 1:5 (/dev/zero) as invalid. > > Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com> > --- > tools/testing/selftests/bpf/.gitignore | 1 - > tools/testing/selftests/bpf/Makefile | 2 - > .../testing/selftests/bpf/prog_tests/cgroup_dev.c | 120 +++++++++++++++++++++ > tools/testing/selftests/bpf/test_dev_cgroup.c | 85 --------------- > 4 files changed, 120 insertions(+), 88 deletions(-) > > diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore > index 4e4aae8aa7ec..8f14d8faeb0b 100644 > --- a/tools/testing/selftests/bpf/.gitignore > +++ b/tools/testing/selftests/bpf/.gitignore > @@ -9,7 +9,6 @@ test_lpm_map > test_tag > FEATURE-DUMP.libbpf > fixdep > -test_dev_cgroup > /test_progs > /test_progs-no_alu32 > /test_progs-bpf_gcc > diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile > index aeada478e37a..2a9ba2246f80 100644 > --- a/tools/testing/selftests/bpf/Makefile > +++ b/tools/testing/selftests/bpf/Makefile > @@ -69,7 +69,6 @@ endif > > # Order correspond to 'make run_tests' order > TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \ > - test_dev_cgroup \ > test_sock test_sockmap get_cgroup_id_user \ > test_cgroup_storage \ > test_tcpnotify_user test_sysctl \ > @@ -295,7 +294,6 @@ JSON_WRITER := $(OUTPUT)/json_writer.o > CAP_HELPERS := $(OUTPUT)/cap_helpers.o > NETWORK_HELPERS := $(OUTPUT)/network_helpers.o > > -$(OUTPUT)/test_dev_cgroup: $(CGROUP_HELPERS) $(TESTING_HELPERS) > $(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) > $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS) > $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS) > diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c > new file mode 100644 > index 000000000000..5112b99213ad > --- /dev/null > +++ b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c > @@ -0,0 +1,120 @@ > +// SPDX-License-Identifier: GPL-2.0 > + > +#include <sys/stat.h> > +#include <sys/sysmacros.h> > +#include "test_progs.h" > +#include "cgroup_helpers.h" > +#include "dev_cgroup.skel.h" > + > +#define TEST_CGROUP "/test-bpf-based-device-cgroup/" > +#define TEST_BUFFER_SIZE 64 > + > +static void test_mknod(const char *path, mode_t mode, int dev_major, > + int dev_minor, int should_fail) > +{ > + int ret; > + > + unlink(path); > + ret = mknod(path, mode, makedev(dev_major, dev_minor)); [..] > + if (should_fail) > + ASSERT_ERR(ret, "mknod"); > + else > + ASSERT_OK(ret, "mknod"); Optional: might be easier to use something like expected_ret instead of should_fail and then do: ASSERT_EQ(ret, expected_ret) I see this part being copy-pasted in a bunch of places below. > + unlink(path); > +} > + > +static void test_read(const char *path, int should_fail) > +{ > + char buf[TEST_BUFFER_SIZE]; > + int ret, fd; > + > + fd = open(path, O_RDONLY); > + > + /* A bare open on unauthorized device should fail */ > + if (should_fail) { > + ASSERT_ERR(fd, "open file for read"); [..] > + if (fd) > + close(fd); nit: should this be 'if (fd >= 0)'? I'm assuming the intention is to avoid close(-1)? > + return; > + } > + > + if (!ASSERT_OK_FD(fd, "open file for read")) > + return; > + > + ret = read(fd, buf, TEST_BUFFER_SIZE); > + if (should_fail) > + ASSERT_ERR(ret, "read"); > + else > + ASSERT_EQ(ret, TEST_BUFFER_SIZE, "read"); > + > + close(fd); > +} > + > +static void test_write(const char *path, int should_fail) > +{ > + char buf[] = "some random test data"; > + int ret, fd; > + > + fd = open(path, O_WRONLY); > + > + /* A bare open on unauthorized device should fail */ > + if (should_fail) { > + ASSERT_ERR(fd, "open file for write"); > + if (fd) > + close(fd); Same 'if (fd >= 0)'
Hello Stanislas, thanks for the review On 7/27/24 00:48, Stanislav Fomichev wrote: > On 07/25, Alexis Lothoré (eBPF Foundation) wrote: [...] >> + if (should_fail) >> + ASSERT_ERR(ret, "mknod"); >> + else >> + ASSERT_OK(ret, "mknod"); > > Optional: might be easier to use something like expected_ret instead > of should_fail and then do: > > ASSERT_EQ(ret, expected_ret) Yes, you are right. I initially went with a version relying on system() to perform the mknods/dd calls, which could return different errors codes so I used this should_fail. But while debugging some issues in CI with this series, I realized that the needed commands are basic enough to be replaced with direct library calls and I forgot to update this part, which can now assert an exact return value. I will update this accordingly. > I see this part being copy-pasted in a bunch of places below. > >> + unlink(path); >> +} >> + >> +static void test_read(const char *path, int should_fail) >> +{ >> + char buf[TEST_BUFFER_SIZE]; >> + int ret, fd; >> + >> + fd = open(path, O_RDONLY); >> + >> + /* A bare open on unauthorized device should fail */ >> + if (should_fail) { >> + ASSERT_ERR(fd, "open file for read"); > > [..] > >> + if (fd) >> + close(fd); > > nit: should this be 'if (fd >= 0)'? I'm assuming the intention is to > avoid close(-1)? Right as well, I'll fix it (here and below) in v2 Thanks, Alexis
diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore index 4e4aae8aa7ec..8f14d8faeb0b 100644 --- a/tools/testing/selftests/bpf/.gitignore +++ b/tools/testing/selftests/bpf/.gitignore @@ -9,7 +9,6 @@ test_lpm_map test_tag FEATURE-DUMP.libbpf fixdep -test_dev_cgroup /test_progs /test_progs-no_alu32 /test_progs-bpf_gcc diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index aeada478e37a..2a9ba2246f80 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -69,7 +69,6 @@ endif # Order correspond to 'make run_tests' order TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \ - test_dev_cgroup \ test_sock test_sockmap get_cgroup_id_user \ test_cgroup_storage \ test_tcpnotify_user test_sysctl \ @@ -295,7 +294,6 @@ JSON_WRITER := $(OUTPUT)/json_writer.o CAP_HELPERS := $(OUTPUT)/cap_helpers.o NETWORK_HELPERS := $(OUTPUT)/network_helpers.o -$(OUTPUT)/test_dev_cgroup: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS) diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c new file mode 100644 index 000000000000..5112b99213ad --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c @@ -0,0 +1,120 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <sys/stat.h> +#include <sys/sysmacros.h> +#include "test_progs.h" +#include "cgroup_helpers.h" +#include "dev_cgroup.skel.h" + +#define TEST_CGROUP "/test-bpf-based-device-cgroup/" +#define TEST_BUFFER_SIZE 64 + +static void test_mknod(const char *path, mode_t mode, int dev_major, + int dev_minor, int should_fail) +{ + int ret; + + unlink(path); + ret = mknod(path, mode, makedev(dev_major, dev_minor)); + if (should_fail) + ASSERT_ERR(ret, "mknod"); + else + ASSERT_OK(ret, "mknod"); + unlink(path); +} + +static void test_read(const char *path, int should_fail) +{ + char buf[TEST_BUFFER_SIZE]; + int ret, fd; + + fd = open(path, O_RDONLY); + + /* A bare open on unauthorized device should fail */ + if (should_fail) { + ASSERT_ERR(fd, "open file for read"); + if (fd) + close(fd); + return; + } + + if (!ASSERT_OK_FD(fd, "open file for read")) + return; + + ret = read(fd, buf, TEST_BUFFER_SIZE); + if (should_fail) + ASSERT_ERR(ret, "read"); + else + ASSERT_EQ(ret, TEST_BUFFER_SIZE, "read"); + + close(fd); +} + +static void test_write(const char *path, int should_fail) +{ + char buf[] = "some random test data"; + int ret, fd; + + fd = open(path, O_WRONLY); + + /* A bare open on unauthorized device should fail */ + if (should_fail) { + ASSERT_ERR(fd, "open file for write"); + if (fd) + close(fd); + return; + } + + if (!ASSERT_OK_FD(fd, "open file for write")) + return; + + ret = write(fd, buf, sizeof(buf)); + if (should_fail) + ASSERT_ERR(ret, "write"); + else + ASSERT_EQ(ret, sizeof(buf), "write"); + + close(fd); +} + +void test_cgroup_dev(void) +{ + struct dev_cgroup *skel; + int cgroup_fd; + + cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); + if (!ASSERT_OK_FD(cgroup_fd, "cgroup switch")) + return; + + skel = dev_cgroup__open_and_load(); + if (!ASSERT_OK_PTR(skel, "load program")) + goto cleanup_cgroup; + + if (!ASSERT_OK(bpf_prog_attach(bpf_program__fd(skel->progs.bpf_prog1), + cgroup_fd, BPF_CGROUP_DEVICE, 0), + "attach_program")) + goto cleanup_progs; + + if (test__start_subtest("deny-mknod")) + test_mknod("/dev/test_dev_cgroup_zero", S_IFCHR, 1, 5, 1); + + if (test__start_subtest("allow-mknod")) + test_mknod("/dev/test_dev_cgroup_null", S_IFCHR, 1, 3, 0); + + if (test__start_subtest("allow-read")) + test_read("/dev/urandom", 0); + + if (test__start_subtest("allow-write")) + test_write("/dev/null", 0); + + if (test__start_subtest("deny-read")) + test_read("/dev/random", 1); + + if (test__start_subtest("deny-write")) + test_write("/dev/zero", 1); + +cleanup_progs: + dev_cgroup__destroy(skel); +cleanup_cgroup: + cleanup_cgroup_environment(); +} diff --git a/tools/testing/selftests/bpf/test_dev_cgroup.c b/tools/testing/selftests/bpf/test_dev_cgroup.c deleted file mode 100644 index 33f544f0005a..000000000000 --- a/tools/testing/selftests/bpf/test_dev_cgroup.c +++ /dev/null @@ -1,85 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* Copyright (c) 2017 Facebook - */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <errno.h> -#include <assert.h> -#include <sys/time.h> - -#include <linux/bpf.h> -#include <bpf/bpf.h> -#include <bpf/libbpf.h> - -#include "cgroup_helpers.h" -#include "testing_helpers.h" - -#define DEV_CGROUP_PROG "./dev_cgroup.bpf.o" - -#define TEST_CGROUP "/test-bpf-based-device-cgroup/" - -int main(int argc, char **argv) -{ - struct bpf_object *obj; - int error = EXIT_FAILURE; - int prog_fd, cgroup_fd; - __u32 prog_cnt; - - /* Use libbpf 1.0 API mode */ - libbpf_set_strict_mode(LIBBPF_STRICT_ALL); - - if (bpf_prog_test_load(DEV_CGROUP_PROG, BPF_PROG_TYPE_CGROUP_DEVICE, - &obj, &prog_fd)) { - printf("Failed to load DEV_CGROUP program\n"); - goto out; - } - - cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); - if (cgroup_fd < 0) { - printf("Failed to create test cgroup\n"); - goto out; - } - - /* Attach bpf program */ - if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_DEVICE, 0)) { - printf("Failed to attach DEV_CGROUP program"); - goto err; - } - - if (bpf_prog_query(cgroup_fd, BPF_CGROUP_DEVICE, 0, NULL, NULL, - &prog_cnt)) { - printf("Failed to query attached programs"); - goto err; - } - - /* All operations with /dev/null and /dev/urandom are allowed, - * everything else is forbidden. - */ - assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5")); - assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - - /* /dev/null is whitelisted */ - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - assert(system("mknod /tmp/test_dev_cgroup_null c 1 3") == 0); - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - - assert(system("dd if=/dev/urandom of=/dev/null count=64") == 0); - - /* src is allowed, target is forbidden */ - assert(system("dd if=/dev/urandom of=/dev/full count=64")); - - /* src is forbidden, target is allowed */ - assert(system("dd if=/dev/random of=/dev/null count=64")); - - error = 0; - printf("test_dev_cgroup:PASS\n"); - -err: - cleanup_cgroup_environment(); - -out: - return error; -}
test_dev_cgroup is defined as a standalone test program, and so is not executed in CI. Convert it to test_progs framework so it is tested automatically in CI, and remove the old test. In order to be able to run it in test_progs, /dev/null must remain usable, so change the new test to test operations on devices 1:3 as valid, and operations on devices 1:5 (/dev/zero) as invalid. Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com> --- tools/testing/selftests/bpf/.gitignore | 1 - tools/testing/selftests/bpf/Makefile | 2 - .../testing/selftests/bpf/prog_tests/cgroup_dev.c | 120 +++++++++++++++++++++ tools/testing/selftests/bpf/test_dev_cgroup.c | 85 --------------- 4 files changed, 120 insertions(+), 88 deletions(-)