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Subject[PATCH bpf-next v8 10/11] bpf,landlock: Add tests for Landlock
Date
Test basic context access, ptrace protection and filesystem hooks and
Landlock program chaining with multiple cases.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David S. Miller <davem@davemloft.net>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Serge E. Hallyn <serge@hallyn.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Will Drewry <wad@chromium.org>
---

Changes since v7:
* update tests and add new ones for filesystem hierarchy and Landlock
chains.

Changes since v6:
* use the new kselftest_harness.h
* use const variables
* replace ASSERT_STEP with ASSERT_*
* rename BPF_PROG_TYPE_LANDLOCK to BPF_PROG_TYPE_LANDLOCK_RULE
* force sample library rebuild
* fix install target

Changes since v5:
* add subtype test
* add ptrace tests
* split and rename files
* cleanup and rebase
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/bpf/bpf_helpers.h | 7 +
tools/testing/selftests/bpf/test_verifier.c | 84 +++++
tools/testing/selftests/landlock/.gitignore | 5 +
tools/testing/selftests/landlock/Makefile | 35 ++
tools/testing/selftests/landlock/test.h | 31 ++
tools/testing/selftests/landlock/test_base.c | 27 ++
tools/testing/selftests/landlock/test_chain.c | 249 +++++++++++++
tools/testing/selftests/landlock/test_fs.c | 492 +++++++++++++++++++++++++
tools/testing/selftests/landlock/test_ptrace.c | 158 ++++++++
10 files changed, 1089 insertions(+)
create mode 100644 tools/testing/selftests/landlock/.gitignore
create mode 100644 tools/testing/selftests/landlock/Makefile
create mode 100644 tools/testing/selftests/landlock/test.h
create mode 100644 tools/testing/selftests/landlock/test_base.c
create mode 100644 tools/testing/selftests/landlock/test_chain.c
create mode 100644 tools/testing/selftests/landlock/test_fs.c
create mode 100644 tools/testing/selftests/landlock/test_ptrace.c

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 7442dfb73b7f..5d00deb3cab6 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -14,6 +14,7 @@ TARGETS += gpio
TARGETS += intel_pstate
TARGETS += ipc
TARGETS += kcmp
+TARGETS += landlock
TARGETS += lib
TARGETS += membarrier
TARGETS += memfd
diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h
index dde2c11d7771..414e267491f7 100644
--- a/tools/testing/selftests/bpf/bpf_helpers.h
+++ b/tools/testing/selftests/bpf/bpf_helpers.h
@@ -86,6 +86,13 @@ static int (*bpf_perf_prog_read_value)(void *ctx, void *buf,
(void *) BPF_FUNC_perf_prog_read_value;
static int (*bpf_override_return)(void *ctx, unsigned long rc) =
(void *) BPF_FUNC_override_return;
+static unsigned long long (*bpf_inode_map_lookup)(void *map, void *key) =
+ (void *) BPF_FUNC_inode_map_lookup;
+static unsigned long long (*bpf_inode_get_tag)(void *inode, void *chain) =
+ (void *) BPF_FUNC_inode_get_tag;
+static unsigned long long (*bpf_landlock_set_tag)(void *tag_obj, void *chain,
+ unsigned long long value) =
+ (void *) BPF_FUNC_landlock_set_tag;

/* llvm builtin functions that eBPF C program may use to
* emit BPF_LD_ABS and BPF_LD_IND instructions
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 3c24a5a7bafc..5f68b95187fe 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -31,6 +31,7 @@
#include <linux/bpf_perf_event.h>
#include <linux/bpf.h>
#include <linux/if_ether.h>
+#include <linux/landlock.h>

#include <bpf/bpf.h>

@@ -11240,6 +11241,89 @@ static struct bpf_test tests[] = {
.result = REJECT,
.has_prog_subtype = true,
},
+ {
+ "missing subtype",
+ .insns = {
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr = "",
+ .result = REJECT,
+ .prog_type = BPF_PROG_TYPE_LANDLOCK_HOOK,
+ },
+ {
+ "landlock/fs_pick: always accept",
+ .insns = {
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_LANDLOCK_HOOK,
+ .has_prog_subtype = true,
+ .prog_subtype = {
+ .landlock_hook = {
+ .type = LANDLOCK_HOOK_FS_PICK,
+ .triggers = LANDLOCK_TRIGGER_FS_PICK_READ,
+ }
+ },
+ },
+ {
+ "landlock/fs_pick: read context",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_pick, cookie)),
+ /* test operations on raw values */
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, 1),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_pick, inode)),
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_LANDLOCK_HOOK,
+ .has_prog_subtype = true,
+ .prog_subtype = {
+ .landlock_hook = {
+ .type = LANDLOCK_HOOK_FS_PICK,
+ .triggers = LANDLOCK_TRIGGER_FS_PICK_READ,
+ }
+ },
+ },
+ {
+ "landlock/fs_pick: no option for previous program",
+ .insns = {
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr = "",
+ .result = REJECT,
+ .prog_type = BPF_PROG_TYPE_LANDLOCK_HOOK,
+ .prog_subtype = {
+ .landlock_hook = {
+ .type = LANDLOCK_HOOK_FS_PICK,
+ .previous = 1,
+ }
+ },
+ },
+ {
+ "landlock/fs_pick: bad previous program FD",
+ .insns = {
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr = "",
+ .result = REJECT,
+ .prog_type = BPF_PROG_TYPE_LANDLOCK_HOOK,
+ .prog_subtype = {
+ .landlock_hook = {
+ .type = LANDLOCK_HOOK_FS_PICK,
+ .options = LANDLOCK_OPTION_PREVIOUS,
+ /* assume FD 0 is a TTY or a pipe */
+ .previous = 0,
+ }
+ },
+ },
};

static int probe_filter_length(const struct bpf_insn *fp)
diff --git a/tools/testing/selftests/landlock/.gitignore b/tools/testing/selftests/landlock/.gitignore
new file mode 100644
index 000000000000..d4e365980c9c
--- /dev/null
+++ b/tools/testing/selftests/landlock/.gitignore
@@ -0,0 +1,5 @@
+/test_base
+/test_chain
+/test_fs
+/test_ptrace
+/tmp_*
diff --git a/tools/testing/selftests/landlock/Makefile b/tools/testing/selftests/landlock/Makefile
new file mode 100644
index 000000000000..9b2791ded1cc
--- /dev/null
+++ b/tools/testing/selftests/landlock/Makefile
@@ -0,0 +1,35 @@
+LIBDIR := ../../../lib
+OBJDIR := ../../../lib/bpf
+BPFOBJS := $(OBJDIR)/bpf.o $(OBJDIR)/nlattr.o
+LOADOBJ := ../../../../samples/bpf/bpf_load.o
+
+CFLAGS += -Wl,-no-as-needed -Wall -O2 -I../../../include/uapi -I$(LIBDIR)
+LDFLAGS += -lelf
+
+test_src = $(wildcard test_*.c)
+
+test_objs := $(test_src:.c=)
+
+TEST_PROGS := $(test_objs)
+
+.PHONY: all clean force
+
+all: $(test_objs)
+
+# force a rebuild of BPFOBJS when its dependencies are updated
+force:
+
+# rebuild bpf.o as a workaround for the samples/bpf bug
+$(BPFOBJS): $(LOADOBJ) force
+ $(MAKE) -C $(OBJDIR)
+
+$(LOADOBJ): force
+ $(MAKE) -C $(dir $(LOADOBJ))
+
+$(test_objs): $(BPFOBJS) $(LOADOBJ) ../kselftest_harness.h
+
+include ../lib.mk
+
+clean:
+ $(RM) $(test_objs)
+
diff --git a/tools/testing/selftests/landlock/test.h b/tools/testing/selftests/landlock/test.h
new file mode 100644
index 000000000000..3046516488d9
--- /dev/null
+++ b/tools/testing/selftests/landlock/test.h
@@ -0,0 +1,31 @@
+/*
+ * Landlock helpers
+ *
+ * Copyright © 2017 Mickaël Salaün <mic@digikod.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <errno.h>
+#include <linux/landlock.h>
+#include <linux/seccomp.h>
+#include <sys/prctl.h>
+#include <sys/syscall.h>
+
+#include "../kselftest_harness.h"
+#include "../../../../samples/bpf/bpf_load.h"
+
+#ifndef SECCOMP_PREPEND_LANDLOCK_PROG
+#define SECCOMP_PREPEND_LANDLOCK_PROG 3
+#endif
+
+#ifndef seccomp
+static int __attribute__((unused)) seccomp(unsigned int op, unsigned int flags,
+ void *args)
+{
+ errno = 0;
+ return syscall(__NR_seccomp, op, flags, args);
+}
+#endif
diff --git a/tools/testing/selftests/landlock/test_base.c b/tools/testing/selftests/landlock/test_base.c
new file mode 100644
index 000000000000..3ad18a779ecf
--- /dev/null
+++ b/tools/testing/selftests/landlock/test_base.c
@@ -0,0 +1,27 @@
+/*
+ * Landlock tests - base
+ *
+ * Copyright © 2017 Mickaël Salaün <mic@digikod.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+
+#include "test.h"
+
+TEST(seccomp_landlock)
+{
+ int ret;
+
+ ret = seccomp(SECCOMP_PREPEND_LANDLOCK_PROG, 0, NULL);
+ EXPECT_EQ(-1, ret);
+ EXPECT_EQ(EFAULT, errno) {
+ TH_LOG("Kernel does not support CONFIG_SECURITY_LANDLOCK");
+ }
+}
+
+TEST_HARNESS_MAIN
diff --git a/tools/testing/selftests/landlock/test_chain.c b/tools/testing/selftests/landlock/test_chain.c
new file mode 100644
index 000000000000..916e84802fd4
--- /dev/null
+++ b/tools/testing/selftests/landlock/test_chain.c
@@ -0,0 +1,249 @@
+/*
+ * Landlock tests - chain
+ *
+ * Copyright © 2018 Mickaël Salaün <mic@digikod.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <errno.h>
+
+#include "test.h"
+
+static int new_prog(struct __test_metadata *_metadata, int is_valid,
+ __u32 hook_type, int prev)
+{
+ const struct bpf_insn prog_accept[] = {
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ };
+ union bpf_prog_subtype subtype = {
+ .landlock_hook = {
+ .type = hook_type,
+ .triggers = hook_type == LANDLOCK_HOOK_FS_PICK ?
+ LANDLOCK_TRIGGER_FS_PICK_OPEN : 0,
+ }
+ };
+ int prog;
+ char log[256] = "";
+
+ if (prev != -1) {
+ subtype.landlock_hook.options = LANDLOCK_OPTION_PREVIOUS;
+ subtype.landlock_hook.previous = prev;
+ }
+ prog = bpf_load_program(BPF_PROG_TYPE_LANDLOCK_HOOK,
+ (const struct bpf_insn *)&prog_accept,
+ sizeof(prog_accept) / sizeof(struct bpf_insn), "GPL",
+ 0, log, sizeof(log), &subtype);
+ if (is_valid) {
+ ASSERT_NE(-1, prog) {
+ TH_LOG("Failed to load program: %s\n%s",
+ strerror(errno), log);
+ }
+ } else {
+ ASSERT_EQ(-1, prog) {
+ TH_LOG("Successfully loaded a wrong program\n");
+ }
+ ASSERT_EQ(errno, EINVAL);
+ }
+ return prog;
+}
+
+static void apply_chain(struct __test_metadata *_metadata, int is_valid,
+ int prog)
+{
+ if (is_valid) {
+ ASSERT_EQ(0, seccomp(SECCOMP_PREPEND_LANDLOCK_PROG, 0, &prog)) {
+ TH_LOG("Failed to apply chain: %s", strerror(errno));
+ }
+ } else {
+ ASSERT_NE(0, seccomp(SECCOMP_PREPEND_LANDLOCK_PROG, 0, &prog)) {
+ TH_LOG("Successfully applied a wrong chain");
+ }
+ ASSERT_EQ(errno, EINVAL);
+ }
+}
+
+TEST(chain_fs_good_walk_pick)
+{
+ /* fs_walk1 -> [fs_pick1] */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ apply_chain(_metadata, 1, fs_pick1);
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_good_pick_pick)
+{
+ /* fs_pick1 -> [fs_pick2] */
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, -1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_pick1);
+ apply_chain(_metadata, 1, fs_pick2);
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+}
+
+TEST(chain_fs_wrong_pick_walk)
+{
+ /* fs_pick1 -> fs_walk1 */
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, -1);
+ new_prog(_metadata, 0, LANDLOCK_HOOK_FS_WALK, fs_pick1);
+ EXPECT_EQ(0, close(fs_pick1));
+}
+
+TEST(chain_fs_wrong_walk_walk)
+{
+ /* fs_walk1 -> fs_walk2 */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ new_prog(_metadata, 0, LANDLOCK_HOOK_FS_WALK, fs_walk1);
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_good_pick_get)
+{
+ /* fs_pick1 -> [fs_get1] */
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, -1);
+ int fs_get1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_GET, fs_pick1);
+ apply_chain(_metadata, 1, fs_get1);
+ EXPECT_EQ(0, close(fs_get1));
+ EXPECT_EQ(0, close(fs_pick1));
+}
+
+TEST(chain_fs_wrong_get_get)
+{
+ /* fs_get1 -> [fs_get2] */
+ int fs_get1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ new_prog(_metadata, 0, LANDLOCK_HOOK_FS_GET, fs_get1);
+ EXPECT_EQ(0, close(fs_get1));
+}
+
+TEST(chain_fs_wrong_tree_1)
+{
+ /* [fs_walk1] -> { [fs_pick1] , [fs_pick2] } */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ apply_chain(_metadata, 1, fs_walk1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ apply_chain(_metadata, 0, fs_pick1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ apply_chain(_metadata, 0, fs_pick2);
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_wrong_tree_2)
+{
+ /* fs_walk1 -> { [fs_pick1] , [fs_pick2] } */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ apply_chain(_metadata, 1, fs_pick1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ apply_chain(_metadata, 0, fs_pick2);
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_wrong_tree_3)
+{
+ /* fs_walk1 -> [fs_pick1] -> [fs_pick2] */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ apply_chain(_metadata, 1, fs_pick1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_pick1);
+ apply_chain(_metadata, 0, fs_pick2);
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_wrong_tree_4)
+{
+ /* fs_walk1 -> fs_pick1 -> fs_pick2 -> { [fs_get1] , [fs_get2] } */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_pick1);
+ int fs_get1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_GET, fs_pick2);
+ apply_chain(_metadata, 1, fs_get1);
+ int fs_get2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_GET, fs_pick2);
+ apply_chain(_metadata, 0, fs_get2);
+ EXPECT_EQ(0, close(fs_get2));
+ EXPECT_EQ(0, close(fs_get1));
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_wrong_tree_5)
+{
+ /* fs_walk1 -> fs_pick1 -> { [fs_pick2] , [fs_pick3] } */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_pick1);
+ apply_chain(_metadata, 1, fs_pick2);
+ int fs_pick3 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_pick1);
+ apply_chain(_metadata, 0, fs_pick3);
+ EXPECT_EQ(0, close(fs_pick3));
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_wrong_tree_6)
+{
+ /* thread 1: fs_walk1 -> fs_pick1 -> [fs_pick2] */
+ /* thread 2: fs_walk1 -> fs_pick1 -> [fs_pick2] -> [fs_get1] */
+ int child;
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_pick1);
+ apply_chain(_metadata, 1, fs_pick2);
+ child = fork();
+ if (child) {
+ /* parent */
+ int status;
+ waitpid(child, &status, 0);
+ EXPECT_TRUE(WIFEXITED(status) && !WEXITSTATUS(status));
+ } else {
+ /* child */
+ int fs_get1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_GET,
+ fs_pick2);
+ apply_chain(_metadata, 0, fs_get1);
+ _exit(0);
+ }
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_good_tree_1)
+{
+ /* fs_walk1 -> fs_pick1 -> [fs_pick2] */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_pick1);
+ apply_chain(_metadata, 1, fs_pick2);
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST(chain_fs_good_tree_2)
+{
+ /* fs_walk1 -> fs_pick1 -> [fs_pick2] -> [fs_get1] */
+ int fs_walk1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_WALK, -1);
+ int fs_pick1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_walk1);
+ int fs_pick2 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_PICK, fs_pick1);
+ apply_chain(_metadata, 1, fs_pick2);
+ int fs_get1 = new_prog(_metadata, 1, LANDLOCK_HOOK_FS_GET, fs_pick2);
+ apply_chain(_metadata, 1, fs_get1);
+ EXPECT_EQ(0, close(fs_get1));
+ EXPECT_EQ(0, close(fs_pick2));
+ EXPECT_EQ(0, close(fs_pick1));
+ EXPECT_EQ(0, close(fs_walk1));
+}
+
+TEST_HARNESS_MAIN
diff --git a/tools/testing/selftests/landlock/test_fs.c b/tools/testing/selftests/landlock/test_fs.c
new file mode 100644
index 000000000000..54d85b16aafb
--- /dev/null
+++ b/tools/testing/selftests/landlock/test_fs.c
@@ -0,0 +1,492 @@
+/*
+ * Landlock tests - file system
+ *
+ * Copyright © 2018 Mickaël Salaün <mic@digikod.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <fcntl.h> /* O_DIRECTORY */
+#include <sys/stat.h> /* statbuf */
+#include <unistd.h> /* faccessat() */
+
+#include "test.h"
+
+#define TEST_PATH_TRIGGERS ( \
+ LANDLOCK_TRIGGER_FS_PICK_OPEN | \
+ LANDLOCK_TRIGGER_FS_PICK_READDIR | \
+ LANDLOCK_TRIGGER_FS_PICK_EXECUTE | \
+ LANDLOCK_TRIGGER_FS_PICK_GETATTR)
+
+static void enforce_depth(struct __test_metadata *_metadata, int depth)
+{
+ const struct bpf_insn prog_walk[] = {
+ BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1,
+ offsetof(struct landlock_ctx_fs_walk, cookie)),
+ BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_1,
+ offsetof(struct landlock_ctx_fs_walk, inode_lookup)),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_7,
+ LANDLOCK_CTX_FS_WALK_INODE_LOOKUP_DOTDOT, 3),
+ /* assume 1 is the root */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 1, 4),
+ BPF_ALU64_IMM(BPF_SUB, BPF_REG_6, 1),
+ BPF_JMP_IMM(BPF_JA, 0, 0, 2),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_7,
+ LANDLOCK_CTX_FS_WALK_INODE_LOOKUP_DOT, 1),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),
+ BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_walk, cookie)),
+ BPF_MOV32_IMM(BPF_REG_0, LANDLOCK_RET_ALLOW),
+ BPF_EXIT_INSN(),
+ };
+ const struct bpf_insn prog_pick[] = {
+ BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1,
+ offsetof(struct landlock_ctx_fs_pick, cookie)),
+ /* allow without fs_walk */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 11),
+ BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_1,
+ offsetof(struct landlock_ctx_fs_walk, inode_lookup)),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_7,
+ LANDLOCK_CTX_FS_WALK_INODE_LOOKUP_DOTDOT, 3),
+ /* assume 1 is the root */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 1, 4),
+ BPF_ALU64_IMM(BPF_SUB, BPF_REG_6, 1),
+ BPF_JMP_IMM(BPF_JA, 0, 0, 2),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_7,
+ LANDLOCK_CTX_FS_WALK_INODE_LOOKUP_DOT, 1),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),
+ BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_walk, cookie)),
+ /* with fs_walk */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, depth + 1, 2),
+ BPF_MOV32_IMM(BPF_REG_0, LANDLOCK_RET_DENY),
+ BPF_EXIT_INSN(),
+ BPF_MOV32_IMM(BPF_REG_0, LANDLOCK_RET_ALLOW),
+ BPF_EXIT_INSN(),
+ };
+ union bpf_prog_subtype subtype = {
+ .landlock_hook = {
+ .type = LANDLOCK_HOOK_FS_WALK,
+ }
+ };
+ int fd_walk, fd_pick;
+ char log[1030] = "";
+
+ fd_walk = bpf_load_program(BPF_PROG_TYPE_LANDLOCK_HOOK,
+ (const struct bpf_insn *)&prog_walk,
+ sizeof(prog_walk) / sizeof(struct bpf_insn), "GPL",
+ 0, log, sizeof(log), &subtype);
+ ASSERT_NE(-1, fd_walk) {
+ TH_LOG("Failed to load fs_walk program: %s\n%s",
+ strerror(errno), log);
+ }
+
+ subtype.landlock_hook.type = LANDLOCK_HOOK_FS_PICK;
+ subtype.landlock_hook.options = LANDLOCK_OPTION_PREVIOUS;
+ subtype.landlock_hook.previous = fd_walk;
+ subtype.landlock_hook.triggers = TEST_PATH_TRIGGERS;
+ fd_pick = bpf_load_program(BPF_PROG_TYPE_LANDLOCK_HOOK,
+ (const struct bpf_insn *)&prog_pick,
+ sizeof(prog_pick) / sizeof(struct bpf_insn), "GPL",
+ 0, log, sizeof(log), &subtype);
+ ASSERT_NE(-1, fd_pick) {
+ TH_LOG("Failed to load fs_pick program: %s\n%s",
+ strerror(errno), log);
+ }
+
+ ASSERT_EQ(0, seccomp(SECCOMP_PREPEND_LANDLOCK_PROG, 0, &fd_pick)) {
+ TH_LOG("Failed to apply Landlock chain: %s", strerror(errno));
+ }
+ EXPECT_EQ(0, close(fd_pick));
+ EXPECT_EQ(0, close(fd_walk));
+}
+
+static void test_path_rel(struct __test_metadata *_metadata, int dirfd,
+ const char *path, int ret)
+{
+ int fd;
+ struct stat statbuf;
+
+ ASSERT_EQ(ret, faccessat(dirfd, path, R_OK | X_OK, 0));
+ ASSERT_EQ(ret, fstatat(dirfd, path, &statbuf, 0));
+ fd = openat(dirfd, path, O_DIRECTORY);
+ if (ret) {
+ ASSERT_EQ(-1, fd);
+ } else {
+ ASSERT_NE(-1, fd);
+ EXPECT_EQ(0, close(fd));
+ }
+}
+
+static void test_path(struct __test_metadata *_metadata, const char *path,
+ int ret)
+{
+ return test_path_rel(_metadata, AT_FDCWD, path, ret);
+}
+
+const char d1[] = "/usr";
+const char d1_dotdot1[] = "/usr/share/..";
+const char d1_dotdot2[] = "/usr/../usr/share/..";
+const char d1_dotdot3[] = "/usr/../../usr/share/..";
+const char d1_dotdot4[] = "/usr/../../../usr/share/..";
+const char d1_dotdot5[] = "/usr/../../../usr/share/../.";
+const char d1_dotdot6[] = "/././usr/./share/..";
+const char d2[] = "/usr/share";
+const char d2_dotdot1[] = "/usr/share/doc/..";
+const char d2_dotdot2[] = "/usr/../usr/share";
+const char d3[] = "/usr/share/doc";
+const char d4[] = "/etc";
+
+TEST(fs_depth_free)
+{
+ test_path(_metadata, d1, 0);
+ test_path(_metadata, d2, 0);
+ test_path(_metadata, d3, 0);
+}
+
+TEST(fs_depth_1)
+{
+ enforce_depth(_metadata, 1);
+ test_path(_metadata, d1, 0);
+ test_path(_metadata, d1_dotdot1, 0);
+ test_path(_metadata, d1_dotdot2, 0);
+ test_path(_metadata, d1_dotdot3, 0);
+ test_path(_metadata, d1_dotdot4, 0);
+ test_path(_metadata, d1_dotdot5, 0);
+ test_path(_metadata, d1_dotdot6, 0);
+ test_path(_metadata, d2, -1);
+ test_path(_metadata, d2_dotdot1, -1);
+ test_path(_metadata, d2_dotdot2, -1);
+ test_path(_metadata, d3, -1);
+}
+
+TEST(fs_depth_2)
+{
+ enforce_depth(_metadata, 2);
+ test_path(_metadata, d1, -1);
+ test_path(_metadata, d1_dotdot1, -1);
+ test_path(_metadata, d1_dotdot2, -1);
+ test_path(_metadata, d1_dotdot3, -1);
+ test_path(_metadata, d1_dotdot4, -1);
+ test_path(_metadata, d1_dotdot5, -1);
+ test_path(_metadata, d1_dotdot6, -1);
+ test_path(_metadata, d2, 0);
+ test_path(_metadata, d2_dotdot2, 0);
+ test_path(_metadata, d2_dotdot1, 0);
+ test_path(_metadata, d3, -1);
+}
+
+#define MAP_VALUE_ALLOW 1
+#define COOKIE_VALUE_ALLOW 2
+
+static int create_inode_map(struct __test_metadata *_metadata,
+ const char *const dirs[])
+{
+ int map, key, i;
+ __u64 value = MAP_VALUE_ALLOW;
+
+ ASSERT_NE(NULL, dirs) {
+ TH_LOG("No directory list\n");
+ }
+ ASSERT_NE(NULL, dirs[0]) {
+ TH_LOG("Empty directory list\n");
+ }
+ for (i = 0; dirs[i]; i++);
+ map = bpf_create_map(BPF_MAP_TYPE_INODE, sizeof(key), sizeof(value),
+ i, 0);
+ ASSERT_NE(-1, map) {
+ TH_LOG("Failed to create a map of %d elements: %s\n", i,
+ strerror(errno));
+ }
+ for (i = 0; dirs[i]; i++) {
+ key = open(dirs[i], O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ ASSERT_NE(-1, key) {
+ TH_LOG("Failed to open directory \"%s\": %s\n", dirs[i],
+ strerror(errno));
+ }
+ ASSERT_EQ(0, bpf_map_update_elem(map, &key, &value, BPF_ANY)) {
+ TH_LOG("Failed to update the map with \"%s\": %s\n",
+ dirs[i], strerror(errno));
+ }
+ close(key);
+ }
+ return map;
+}
+
+#define TAG_VALUE_ALLOW 1
+
+static void enforce_map(struct __test_metadata *_metadata, int map,
+ bool subpath, bool tag)
+{
+ /* do not handle dot nor dotdot */
+ const struct bpf_insn prog_walk[] = {
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),
+ /* look at the inode's tag */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_walk, inode)),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_walk, chain)),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_inode_get_tag),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, TAG_VALUE_ALLOW, 5),
+ /* look for the requested inode in the map */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_walk, inode)),
+ BPF_LD_MAP_FD(BPF_REG_1, map), /* 2 instructions */
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_inode_map_lookup),
+ /* if it is there, then mark the session as such */
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, MAP_VALUE_ALLOW, 2),
+ BPF_MOV64_IMM(BPF_REG_7, COOKIE_VALUE_ALLOW),
+ BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_7,
+ offsetof(struct landlock_ctx_fs_walk, cookie)),
+ /* allow to walk anything... but not to pick anything */
+ BPF_MOV32_IMM(BPF_REG_0, LANDLOCK_RET_ALLOW),
+ BPF_EXIT_INSN(),
+ };
+ /* do not handle dot nor dotdot */
+ const struct bpf_insn prog_pick[] = {
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),
+ /* allow if the inode's tag is mark as such */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_pick, inode)),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_pick, chain)),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_inode_get_tag),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, TAG_VALUE_ALLOW, 9),
+ /* look if the walk saw an inode in the whitelist */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_pick, cookie)),
+ /* if it was there, then allow access */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_7, COOKIE_VALUE_ALLOW, 7),
+ /* otherwise, look for the requested inode in the map */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_pick, inode)),
+ BPF_LD_MAP_FD(BPF_REG_1, map), /* 2 instructions */
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_inode_map_lookup),
+ /* if it is there, then allow access */
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, MAP_VALUE_ALLOW, 2),
+ /* otherwise deny access */
+ BPF_MOV32_IMM(BPF_REG_0, LANDLOCK_RET_DENY),
+ BPF_EXIT_INSN(),
+ BPF_MOV32_IMM(BPF_REG_0, LANDLOCK_RET_ALLOW),
+ BPF_EXIT_INSN(),
+ };
+ const struct bpf_insn prog_get[] = {
+ BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),
+ /* if prog_pick allowed this prog_get, then keep the state in
+ * the inode's tag */
+ BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_get, tag_object)),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_6,
+ offsetof(struct landlock_ctx_fs_get, chain)),
+ BPF_MOV64_IMM(BPF_REG_3, TAG_VALUE_ALLOW),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_landlock_set_tag),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
+ /* for this test, deny on error */
+ BPF_MOV32_IMM(BPF_REG_0, LANDLOCK_RET_DENY),
+ BPF_EXIT_INSN(),
+ /* the check was previously performed by prog_pick */
+ BPF_MOV32_IMM(BPF_REG_0, LANDLOCK_RET_ALLOW),
+ BPF_EXIT_INSN(),
+ };
+ union bpf_prog_subtype subtype = {};
+ int fd_walk = -1, fd_pick, fd_get, fd_last;
+ char log[1024] = "";
+
+ if (subpath) {
+ subtype.landlock_hook.type = LANDLOCK_HOOK_FS_WALK;
+ fd_walk = bpf_load_program(BPF_PROG_TYPE_LANDLOCK_HOOK,
+ (const struct bpf_insn *)&prog_walk,
+ sizeof(prog_walk) / sizeof(struct bpf_insn),
+ "GPL", 0, log, sizeof(log), &subtype);
+ ASSERT_NE(-1, fd_walk) {
+ TH_LOG("Failed to load fs_walk program: %s\n%s",
+ strerror(errno), log);
+ }
+ subtype.landlock_hook.options = LANDLOCK_OPTION_PREVIOUS;
+ subtype.landlock_hook.previous = fd_walk;
+ }
+
+ subtype.landlock_hook.type = LANDLOCK_HOOK_FS_PICK;
+ subtype.landlock_hook.triggers = TEST_PATH_TRIGGERS;
+ fd_pick = bpf_load_program(BPF_PROG_TYPE_LANDLOCK_HOOK,
+ (const struct bpf_insn *)&prog_pick,
+ sizeof(prog_pick) / sizeof(struct bpf_insn), "GPL", 0,
+ log, sizeof(log), &subtype);
+ ASSERT_NE(-1, fd_pick) {
+ TH_LOG("Failed to load fs_pick program: %s\n%s",
+ strerror(errno), log);
+ }
+ fd_last = fd_pick;
+
+ if (tag) {
+ subtype.landlock_hook.type = LANDLOCK_HOOK_FS_GET;
+ subtype.landlock_hook.triggers = 0;
+ subtype.landlock_hook.options = LANDLOCK_OPTION_PREVIOUS;
+ subtype.landlock_hook.previous = fd_pick;
+ fd_get = bpf_load_program(BPF_PROG_TYPE_LANDLOCK_HOOK,
+ (const struct bpf_insn *)&prog_get,
+ sizeof(prog_get) / sizeof(struct bpf_insn),
+ "GPL", 0, log, sizeof(log), &subtype);
+ ASSERT_NE(-1, fd_get) {
+ TH_LOG("Failed to load fs_get program: %s\n%s",
+ strerror(errno), log);
+ }
+ fd_last = fd_get;
+ }
+
+ ASSERT_EQ(0, seccomp(SECCOMP_PREPEND_LANDLOCK_PROG, 0, &fd_last)) {
+ TH_LOG("Failed to apply Landlock chain: %s", strerror(errno));
+ }
+ if (tag)
+ EXPECT_EQ(0, close(fd_get));
+ EXPECT_EQ(0, close(fd_pick));
+ if (subpath)
+ EXPECT_EQ(0, close(fd_walk));
+}
+
+/* do not handle dot nor dotdot */
+static void check_map_whitelist(struct __test_metadata *_metadata,
+ bool subpath)
+{
+ int map = create_inode_map(_metadata, (const char *const [])
+ { d2, NULL });
+ ASSERT_NE(-1, map);
+ enforce_map(_metadata, map, subpath, false);
+ test_path(_metadata, d1, -1);
+ test_path(_metadata, d2, 0);
+ test_path(_metadata, d3, subpath ? 0 : -1);
+ EXPECT_EQ(0, close(map));
+}
+
+TEST(fs_map_whitelist_literal)
+{
+ check_map_whitelist(_metadata, false);
+}
+
+TEST(fs_map_whitelist_subpath)
+{
+ check_map_whitelist(_metadata, true);
+}
+
+const char r2[] = ".";
+const char r3[] = "./doc";
+
+enum relative_access {
+ REL_OPEN,
+ REL_CHDIR,
+ REL_CHROOT,
+};
+
+static void check_tag(struct __test_metadata *_metadata,
+ bool enforce, bool with_tag, enum relative_access rel)
+{
+ int dirfd;
+ int map = -1;
+ int access_beneath, access_absolute;
+
+ if (rel == REL_CHROOT) {
+ /* do not tag with the chdir, only with the chroot */
+ ASSERT_NE(-1, chdir(d2));
+ }
+ if (enforce) {
+ map = create_inode_map(_metadata, (const char *const [])
+ { d1, NULL });
+ ASSERT_NE(-1, map);
+ enforce_map(_metadata, map, true, with_tag);
+ }
+ switch (rel) {
+ case REL_OPEN:
+ dirfd = open(d2, O_DIRECTORY);
+ ASSERT_NE(-1, dirfd);
+ break;
+ case REL_CHDIR:
+ ASSERT_NE(-1, chdir(d2));
+ dirfd = AT_FDCWD;
+ break;
+ case REL_CHROOT:
+ ASSERT_NE(-1, chroot(d2)) {
+ TH_LOG("Failed to chroot: %s\n", strerror(errno));
+ }
+ dirfd = AT_FDCWD;
+ break;
+ default:
+ ASSERT_TRUE(false);
+ return;
+ }
+
+ access_beneath = (!enforce || with_tag) ? 0 : -1;
+ test_path_rel(_metadata, dirfd, r2, access_beneath);
+ test_path_rel(_metadata, dirfd, r3, access_beneath);
+
+ access_absolute = (enforce || rel == REL_CHROOT) ? -1 : 0;
+ test_path(_metadata, d4, access_absolute);
+ test_path_rel(_metadata, dirfd, d4, access_absolute);
+
+ if (rel == REL_OPEN)
+ EXPECT_EQ(0, close(dirfd));
+ if (enforce)
+ EXPECT_EQ(0, close(map));
+}
+
+TEST(fs_notag_allow_open)
+{
+ /* no enforcement, via open */
+ check_tag(_metadata, false, false, REL_OPEN);
+}
+
+TEST(fs_notag_allow_chdir)
+{
+ /* no enforcement, via chdir */
+ check_tag(_metadata, false, false, REL_CHDIR);
+}
+
+TEST(fs_notag_allow_chroot)
+{
+ /* no enforcement, via chroot */
+ check_tag(_metadata, false, false, REL_CHROOT);
+}
+
+TEST(fs_notag_deny_open)
+{
+ /* enforcement without tag, via open */
+ check_tag(_metadata, true, false, REL_OPEN);
+}
+
+TEST(fs_notag_deny_chdir)
+{
+ /* enforcement without tag, via chdir */
+ check_tag(_metadata, true, false, REL_CHDIR);
+}
+
+TEST(fs_notag_deny_chroot)
+{
+ /* enforcement without tag, via chroot */
+ check_tag(_metadata, true, false, REL_CHROOT);
+}
+
+TEST(fs_tag_allow_open)
+{
+ /* enforcement with tag, via open */
+ check_tag(_metadata, true, true, REL_OPEN);
+}
+
+TEST(fs_tag_allow_chdir)
+{
+ /* enforcement with tag, via chdir */
+ check_tag(_metadata, true, true, REL_CHDIR);
+}
+
+TEST(fs_tag_allow_chroot)
+{
+ /* enforcement with tag, via chroot */
+ check_tag(_metadata, true, true, REL_CHROOT);
+}
+
+TEST_HARNESS_MAIN
diff --git a/tools/testing/selftests/landlock/test_ptrace.c b/tools/testing/selftests/landlock/test_ptrace.c
new file mode 100644
index 000000000000..1423a60b6e0a
--- /dev/null
+++ b/tools/testing/selftests/landlock/test_ptrace.c
@@ -0,0 +1,158 @@
+/*
+ * Landlock tests - ptrace
+ *
+ * Copyright © 2017 Mickaël Salaün <mic@digikod.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#define _GNU_SOURCE
+#include <signal.h> /* raise */
+#include <sys/ptrace.h>
+#include <sys/types.h> /* waitpid */
+#include <sys/wait.h> /* waitpid */
+#include <unistd.h> /* fork, pipe */
+
+#include "test.h"
+
+static void apply_null_sandbox(struct __test_metadata *_metadata)
+{
+ const struct bpf_insn prog_accept[] = {
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ };
+ const union bpf_prog_subtype subtype = {
+ .landlock_hook = {
+ .type = LANDLOCK_HOOK_FS_PICK,
+ .triggers = LANDLOCK_TRIGGER_FS_PICK_OPEN,
+ }
+ };
+ int prog;
+ char log[256] = "";
+
+ prog = bpf_load_program(BPF_PROG_TYPE_LANDLOCK_HOOK,
+ (const struct bpf_insn *)&prog_accept,
+ sizeof(prog_accept) / sizeof(struct bpf_insn), "GPL",
+ 0, log, sizeof(log), &subtype);
+ ASSERT_NE(-1, prog) {
+ TH_LOG("Failed to load minimal rule: %s\n%s",
+ strerror(errno), log);
+ }
+ ASSERT_EQ(0, seccomp(SECCOMP_PREPEND_LANDLOCK_PROG, 0, &prog)) {
+ TH_LOG("Failed to apply minimal rule: %s", strerror(errno));
+ }
+ EXPECT_EQ(0, close(prog));
+}
+
+/* PTRACE_TRACEME and PTRACE_ATTACH without Landlock rules effect */
+static void check_ptrace(struct __test_metadata *_metadata,
+ int sandbox_both, int sandbox_parent, int sandbox_child,
+ int expect_ptrace)
+{
+ pid_t child;
+ int status;
+ int pipefd[2];
+
+ ASSERT_EQ(0, pipe(pipefd));
+ if (sandbox_both)
+ apply_null_sandbox(_metadata);
+
+ child = fork();
+ ASSERT_LE(0, child);
+ if (child == 0) {
+ char buf;
+
+ EXPECT_EQ(0, close(pipefd[1]));
+ if (sandbox_child)
+ apply_null_sandbox(_metadata);
+
+ /* test traceme */
+ ASSERT_EQ(expect_ptrace, ptrace(PTRACE_TRACEME));
+ if (expect_ptrace) {
+ ASSERT_EQ(EPERM, errno);
+ } else {
+ ASSERT_EQ(0, raise(SIGSTOP));
+ }
+
+ /* sync */
+ ASSERT_EQ(1, read(pipefd[0], &buf, 1)) {
+ TH_LOG("Failed to read() sync from parent");
+ }
+ ASSERT_EQ('.', buf);
+ _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
+ }
+
+ EXPECT_EQ(0, close(pipefd[0]));
+ if (sandbox_parent)
+ apply_null_sandbox(_metadata);
+
+ /* test traceme */
+ if (!expect_ptrace) {
+ ASSERT_EQ(child, waitpid(child, &status, 0));
+ ASSERT_EQ(1, WIFSTOPPED(status));
+ ASSERT_EQ(0, ptrace(PTRACE_DETACH, child, NULL, 0));
+ }
+ /* test attach */
+ ASSERT_EQ(expect_ptrace, ptrace(PTRACE_ATTACH, child, NULL, 0));
+ if (expect_ptrace) {
+ ASSERT_EQ(EPERM, errno);
+ } else {
+ ASSERT_EQ(child, waitpid(child, &status, 0));
+ ASSERT_EQ(1, WIFSTOPPED(status));
+ ASSERT_EQ(0, ptrace(PTRACE_CONT, child, NULL, 0));
+ }
+
+ /* sync */
+ ASSERT_EQ(1, write(pipefd[1], ".", 1)) {
+ TH_LOG("Failed to write() sync to child");
+ }
+ ASSERT_EQ(child, waitpid(child, &status, 0));
+ if (WIFSIGNALED(status) || WEXITSTATUS(status))
+ _metadata->passed = 0;
+}
+
+TEST(ptrace_allow_without_sandbox)
+{
+ /* no sandbox */
+ check_ptrace(_metadata, 0, 0, 0, 0);
+}
+
+TEST(ptrace_allow_with_one_sandbox)
+{
+ /* child sandbox */
+ check_ptrace(_metadata, 0, 0, 1, 0);
+}
+
+TEST(ptrace_allow_with_nested_sandbox)
+{
+ /* inherited and child sandbox */
+ check_ptrace(_metadata, 1, 0, 1, 0);
+}
+
+TEST(ptrace_deny_with_parent_sandbox)
+{
+ /* parent sandbox */
+ check_ptrace(_metadata, 0, 1, 0, -1);
+}
+
+TEST(ptrace_deny_with_nested_and_parent_sandbox)
+{
+ /* inherited and parent sandbox */
+ check_ptrace(_metadata, 1, 1, 0, -1);
+}
+
+TEST(ptrace_deny_with_forked_sandbox)
+{
+ /* inherited, parent and child sandbox */
+ check_ptrace(_metadata, 1, 1, 1, -1);
+}
+
+TEST(ptrace_deny_with_sibling_sandbox)
+{
+ /* parent and child sandbox */
+ check_ptrace(_metadata, 0, 1, 1, -1);
+}
+
+TEST_HARNESS_MAIN
--
2.16.2
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