Port syscall filtering unit tests to C++.
That way they can be run on Android Platform Continuous Testing,
which requires gtest for parsing of test output. Also fix some issues
in the tests:
-Use ASSERT instead of EXCEPT for pointers that are later
dereferenced.
-Add a few missing ASSERTs.
syscall_filter_unittest.cpp has no changes from
syscall_filter_unittest.c. Keep parallel targets for now, and once
Chrome OS is updated, remove C targets.
Bug: 30973585
Change-Id: I46a1474afa8850015da927ce8c7d9f8b8ce95b65
diff --git a/syscall_filter_unittest.cpp b/syscall_filter_unittest.cpp
new file mode 100644
index 0000000..09e98f6
--- /dev/null
+++ b/syscall_filter_unittest.cpp
@@ -0,0 +1,769 @@
+// syscall_filter_unittest.cpp
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Test syscall filtering using gtest.
+
+#include <asm/unistd.h>
+#include <errno.h>
+#include <fcntl.h> /* For O_WRONLY. */
+
+#include <gtest/gtest.h>
+
+#include "bpf.h"
+#include "syscall_filter.h"
+#include "syscall_filter_unittest_macros.h"
+#include "util.h"
+
+/* Test that setting one BPF instruction works. */
+TEST(bpf, set_bpf_instr) {
+ struct sock_filter instr;
+ unsigned char code = BPF_LD + BPF_W + BPF_ABS;
+ unsigned int k = 4;
+ unsigned char jt = 1, jf = 2;
+
+ size_t len = set_bpf_instr(&instr, code, k, jt, jf);
+
+ EXPECT_EQ(len, 1U);
+ EXPECT_EQ_BLOCK(&instr, code, k, jt, jf);
+}
+
+TEST(bpf, bpf_load_arg) {
+ struct sock_filter load_arg[BPF_LOAD_ARG_LEN];
+ int argidx = 1;
+ size_t len = bpf_load_arg(load_arg, argidx);
+
+ EXPECT_EQ(len, BPF_LOAD_ARG_LEN);
+
+#if defined(BITS32)
+ EXPECT_EQ_STMT(&load_arg[0], BPF_LD + BPF_W + BPF_ABS, LO_ARG(argidx));
+#elif defined(BITS64)
+ EXPECT_EQ_STMT(&load_arg[0], BPF_LD + BPF_W + BPF_ABS, LO_ARG(argidx));
+ EXPECT_EQ_STMT(&load_arg[1], BPF_ST, 0);
+ EXPECT_EQ_STMT(&load_arg[2], BPF_LD + BPF_W + BPF_ABS, HI_ARG(argidx));
+ EXPECT_EQ_STMT(&load_arg[3], BPF_ST, 1);
+#endif
+}
+
+TEST(bpf, bpf_comp_jeq) {
+ struct sock_filter comp_jeq[BPF_COMP_LEN];
+ unsigned long c = 1;
+ unsigned char jt = 1;
+ unsigned char jf = 2;
+
+ size_t len = bpf_comp_jeq(comp_jeq, c, jt, jf);
+
+ EXPECT_EQ(len, BPF_COMP_LEN);
+
+#if defined(BITS32)
+ EXPECT_EQ_BLOCK(&comp_jeq[0], BPF_JMP + BPF_JEQ + BPF_K, c, jt, jf);
+#elif defined(BITS64)
+ EXPECT_EQ_BLOCK(&comp_jeq[0], BPF_JMP + BPF_JEQ + BPF_K, 0, 0, jf + 2);
+ EXPECT_EQ_STMT(&comp_jeq[1], BPF_LD + BPF_MEM, 0);
+ EXPECT_EQ_BLOCK(&comp_jeq[2], BPF_JMP + BPF_JEQ + BPF_K, c, jt, jf);
+#endif
+}
+
+TEST(bpf, bpf_comp_jset) {
+ struct sock_filter comp_jset[BPF_COMP_LEN];
+ unsigned long mask = O_WRONLY;
+ unsigned char jt = 1;
+ unsigned char jf = 2;
+
+ size_t len = bpf_comp_jset(comp_jset, mask, jt, jf);
+
+ EXPECT_EQ(len, BPF_COMP_LEN);
+
+#if defined(BITS32)
+ EXPECT_EQ_BLOCK(&comp_jset[0], BPF_JMP + BPF_JSET + BPF_K, mask, jt, jf);
+#elif defined(BITS64)
+ EXPECT_EQ_BLOCK(&comp_jset[0], BPF_JMP + BPF_JSET + BPF_K, 0, jt + 2, 0);
+ EXPECT_EQ_STMT(&comp_jset[1], BPF_LD + BPF_MEM, 0);
+ EXPECT_EQ_BLOCK(&comp_jset[2], BPF_JMP + BPF_JSET + BPF_K, mask, jt, jf);
+#endif
+}
+
+TEST(bpf, bpf_arg_comp) {
+ struct sock_filter *arg_comp;
+ int op = EQ;
+ int argidx = 1;
+ unsigned long c = 3;
+ unsigned int label_id = 0;
+
+ size_t len = bpf_arg_comp(&arg_comp, op, argidx, c, label_id);
+
+ EXPECT_EQ(len, BPF_ARG_COMP_LEN + 1);
+
+#if defined(BITS32)
+ EXPECT_EQ_STMT(&arg_comp[0], BPF_LD + BPF_W + BPF_ABS, LO_ARG(argidx));
+ EXPECT_EQ_BLOCK(&arg_comp[1], BPF_JMP + BPF_JEQ + BPF_K, c, 1, 0);
+ EXPECT_JUMP_LBL(&arg_comp[2]);
+#elif defined(BITS64)
+ EXPECT_EQ_STMT(&arg_comp[0], BPF_LD + BPF_W + BPF_ABS, LO_ARG(argidx));
+ EXPECT_EQ_STMT(&arg_comp[1], BPF_ST, 0);
+ EXPECT_EQ_STMT(&arg_comp[2], BPF_LD + BPF_W + BPF_ABS, HI_ARG(argidx));
+ EXPECT_EQ_STMT(&arg_comp[3], BPF_ST, 1);
+
+ EXPECT_EQ_BLOCK(&arg_comp[4], BPF_JMP + BPF_JEQ + BPF_K, 0, 0, 2);
+ EXPECT_EQ_STMT(&arg_comp[5], BPF_LD + BPF_MEM, 0);
+ EXPECT_EQ_BLOCK(&arg_comp[6], BPF_JMP + BPF_JEQ + BPF_K, c, 1, 0);
+ EXPECT_JUMP_LBL(&arg_comp[7]);
+#endif
+ free(arg_comp);
+}
+
+TEST(bpf, bpf_validate_arch) {
+ struct sock_filter validate_arch[ARCH_VALIDATION_LEN];
+
+ size_t len = bpf_validate_arch(validate_arch);
+
+ EXPECT_EQ(len, ARCH_VALIDATION_LEN);
+ EXPECT_ARCH_VALIDATION(validate_arch);
+}
+
+TEST(bpf, bpf_allow_syscall) {
+ struct sock_filter allow_syscall[ALLOW_SYSCALL_LEN];
+ int nr = 1;
+
+ size_t len = bpf_allow_syscall(allow_syscall, nr);
+
+ EXPECT_EQ(len, ALLOW_SYSCALL_LEN);
+ EXPECT_ALLOW_SYSCALL(allow_syscall, nr);
+}
+
+TEST(bpf, bpf_allow_syscall_args) {
+ struct sock_filter allow_syscall[ALLOW_SYSCALL_LEN];
+ int nr = 1;
+ unsigned int id = 1024;
+
+ size_t len = bpf_allow_syscall_args(allow_syscall, nr, id);
+
+ EXPECT_EQ(len, ALLOW_SYSCALL_LEN);
+ EXPECT_ALLOW_SYSCALL_ARGS(allow_syscall, nr, id, JUMP_JT, JUMP_JF);
+}
+
+class ArgFilterTest : public ::testing::Test {
+ protected:
+ virtual void TearDown() { free_label_strings(&labels_); }
+ struct bpf_labels labels_;
+};
+
+TEST_F(ArgFilterTest, arg0_equals) {
+ const char *fragment = "arg0 == 0";
+ int nr = 1;
+ unsigned int id = 0;
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is a comparison. */
+ curr_block = block->next;
+ EXPECT_COMP(curr_block);
+
+ /* Third block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /* Fourth block is SECCOMP_RET_KILL. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_KILL(curr_block);
+
+ /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_ALLOW(curr_block);
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+TEST_F(ArgFilterTest, arg0_mask) {
+ const char *fragment = "arg1 & O_RDWR";
+ int nr = 1;
+ unsigned int id = 0;
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is a comparison. */
+ curr_block = block->next;
+ EXPECT_COMP(curr_block);
+
+ /* Third block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /* Fourth block is SECCOMP_RET_KILL. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_KILL(curr_block);
+
+ /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_ALLOW(curr_block);
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+TEST_F(ArgFilterTest, arg0_eq_mask) {
+ const char *fragment = "arg1 == O_WRONLY|O_CREAT";
+ int nr = 1;
+ unsigned int id = 0;
+
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is a comparison. */
+ curr_block = block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+ EXPECT_EQ(curr_block->instrs[BPF_ARG_COMP_LEN - 1].k,
+ (unsigned int)(O_WRONLY | O_CREAT));
+
+ /* Third block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /* Fourth block is SECCOMP_RET_KILL. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_KILL(curr_block);
+
+ /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_ALLOW(curr_block);
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+TEST_F(ArgFilterTest, and_or) {
+ const char *fragment = "arg0 == 0 && arg1 == 0 || arg0 == 1";
+ int nr = 1;
+ unsigned int id = 0;
+
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 1 + 3 * (BPF_ARG_COMP_LEN + 1) + 2 + 2 + 1 + 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is a comparison ("arg0 == 0"). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+
+ /* Third block is a comparison ("arg1 == 0"). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+
+ /* Fourth block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /* Fifth block is a comparison ("arg0 == 1"). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+
+ /* Sixth block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /* Seventh block is SECCOMP_RET_KILL. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_KILL(curr_block);
+
+ /* Eigth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_ALLOW(curr_block);
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+TEST_F(ArgFilterTest, ret_errno) {
+ const char *fragment = "arg0 == 0 || arg0 == 1; return 1";
+ int nr = 1;
+ unsigned int id = 0;
+
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 1 + 2 * (BPF_ARG_COMP_LEN + 1) + 2 + 2 + 1 + 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is a comparison ("arg0 == 0"). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+
+ /* Third block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /* Fourth block is a comparison ("arg0 == 1"). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+
+ /* Fifth block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /* Sixth block is SECCOMP_RET_ERRNO. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(curr_block->len, 1U);
+ EXPECT_EQ_STMT(curr_block->instrs,
+ BPF_RET + BPF_K,
+ SECCOMP_RET_ERRNO | (1 & SECCOMP_RET_DATA));
+
+ /* Seventh block is "SUCCESS" label and SECCOMP_RET_ALLOW. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_ALLOW(curr_block);
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+TEST_F(ArgFilterTest, unconditional_errno) {
+ const char *fragment = "return 1";
+ int nr = 1;
+ unsigned int id = 0;
+
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is SECCOMP_RET_ERRNO. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(curr_block->len, 1U);
+ EXPECT_EQ_STMT(curr_block->instrs,
+ BPF_RET + BPF_K,
+ SECCOMP_RET_ERRNO | (1 & SECCOMP_RET_DATA));
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+TEST_F(ArgFilterTest, invalid) {
+ const char *fragment = "argnn == 0";
+ int nr = 1;
+ unsigned int id = 0;
+
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+ ASSERT_TRUE(block == NULL);
+
+ fragment = "arg0 == 0 && arg1 == 1; return errno";
+ block = compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+ ASSERT_TRUE(block == NULL);
+}
+
+TEST_F(ArgFilterTest, log_no_ret_error) {
+ const char *fragment = "arg0 == 0";
+ int nr = 1;
+ unsigned int id = 0;
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, USE_LOGGING);
+
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is a comparison. */
+ curr_block = block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+
+ /* Third block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /* Fourth block is SECCOMP_RET_TRAP, with no errno. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_TRAP(curr_block);
+
+ /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_ALLOW(curr_block);
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+TEST_F(ArgFilterTest, log_bad_ret_error) {
+ const char *fragment = "arg0 == 0; return";
+ int nr = 1;
+ unsigned int id = 0;
+
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, NO_LOGGING);
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is a comparison ("arg0 == 0"). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+
+ /* Third block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /*
+ * Sixth block is NOT SECCOMP_RET_ERRNO, it should be SECCOMP_RET_KILL.
+ */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_KILL(curr_block);
+
+ /* Seventh block is "SUCCESS" label and SECCOMP_RET_ALLOW. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_ALLOW(curr_block);
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+TEST_F(ArgFilterTest, no_log_bad_ret_error) {
+ const char *fragment = "arg0 == 0; return";
+ int nr = 1;
+ unsigned int id = 0;
+
+ struct filter_block *block =
+ compile_section(nr, fragment, id, &labels_, USE_LOGGING);
+ ASSERT_TRUE(block != NULL);
+ size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2;
+ EXPECT_EQ(block->total_len, exp_total_len);
+
+ /* First block is a label. */
+ struct filter_block *curr_block = block;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_EQ(block->len, 1U);
+ EXPECT_LBL(curr_block->instrs);
+
+ /* Second block is a comparison ("arg0 == 0"). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_COMP(curr_block);
+
+ /* Third block is a jump and a label (end of AND group). */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_GROUP_END(curr_block);
+
+ /*
+ * Sixth block is *not* SECCOMP_RET_ERRNO, it should be
+ * SECCOMP_RET_TRAP.
+ */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_TRAP(curr_block);
+
+ /* Seventh block is "SUCCESS" label and SECCOMP_RET_ALLOW. */
+ curr_block = curr_block->next;
+ ASSERT_TRUE(curr_block != NULL);
+ EXPECT_ALLOW(curr_block);
+
+ EXPECT_TRUE(curr_block->next == NULL);
+
+ free_block_list(block);
+}
+
+FILE *write_policy_to_pipe(const char *policy, size_t len) {
+ int pipefd[2];
+ if (pipe(pipefd) == -1) {
+ pwarn("pipe(pipefd) failed");
+ return NULL;
+ }
+
+ size_t i = 0;
+ unsigned int attempts = 0;
+ ssize_t ret;
+ while (i < len) {
+ ret = write(pipefd[1], &policy[i], len - i);
+ if (ret == -1) {
+ close(pipefd[0]);
+ close(pipefd[1]);
+ return NULL;
+ }
+
+ /* If we write 0 bytes three times in a row, fail. */
+ if (ret == 0) {
+ if (++attempts >= 3) {
+ close(pipefd[0]);
+ close(pipefd[1]);
+ warn("write() returned 0 three times in a row");
+ return NULL;
+ }
+ continue;
+ }
+
+ attempts = 0;
+ i += (size_t)ret;
+ }
+
+ close(pipefd[1]);
+ return fdopen(pipefd[0], "r");
+}
+
+TEST(FilterTest, seccomp_mode1) {
+ struct sock_fprog actual;
+ const char *policy =
+ "read: 1\n"
+ "write: 1\n"
+ "rt_sigreturn: 1\n"
+ "exit: 1\n";
+
+ FILE *policy_file = write_policy_to_pipe(policy, strlen(policy));
+ ASSERT_TRUE(policy_file != NULL);
+
+ int res = compile_filter(policy_file, &actual, NO_LOGGING);
+ fclose(policy_file);
+
+ /*
+ * Checks return value, filter length, and that the filter
+ * validates arch, loads syscall number, and
+ * only allows expected syscalls.
+ */
+ ASSERT_EQ(res, 0);
+ EXPECT_EQ(actual.len, 13);
+ EXPECT_ARCH_VALIDATION(actual.filter);
+ EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN,
+ BPF_LD + BPF_W + BPF_ABS,
+ syscall_nr);
+ EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 1, __NR_read);
+ EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 3, __NR_write);
+ EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 5,
+ __NR_rt_sigreturn);
+ EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 7, __NR_exit);
+ EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN + 9,
+ BPF_RET + BPF_K,
+ SECCOMP_RET_KILL);
+
+ free(actual.filter);
+}
+
+TEST(FilterTest, seccomp_read_write) {
+ struct sock_fprog actual;
+ const char *policy =
+ "read: arg0 == 0\n"
+ "write: arg0 == 1 || arg0 == 2\n"
+ "rt_sigreturn: 1\n"
+ "exit: 1\n";
+
+ FILE *policy_file = write_policy_to_pipe(policy, strlen(policy));
+ ASSERT_TRUE(policy_file != NULL);
+
+ int res = compile_filter(policy_file, &actual, NO_LOGGING);
+ fclose(policy_file);
+
+ /*
+ * Checks return value, filter length, and that the filter
+ * validates arch, loads syscall number, and
+ * only allows expected syscalls, jumping to correct arg filter
+ * offsets.
+ */
+ ASSERT_EQ(res, 0);
+ size_t exp_total_len = 27 + 3 * (BPF_ARG_COMP_LEN + 1);
+ EXPECT_EQ(actual.len, exp_total_len);
+
+ EXPECT_ARCH_VALIDATION(actual.filter);
+ EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN,
+ BPF_LD + BPF_W + BPF_ABS,
+ syscall_nr);
+ EXPECT_ALLOW_SYSCALL_ARGS(
+ actual.filter + ARCH_VALIDATION_LEN + 1, __NR_read, 7, 0, 0);
+ EXPECT_ALLOW_SYSCALL_ARGS(actual.filter + ARCH_VALIDATION_LEN + 3,
+ __NR_write,
+ 12 + BPF_ARG_COMP_LEN,
+ 0,
+ 0);
+ EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 5,
+ __NR_rt_sigreturn);
+ EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 7, __NR_exit);
+ EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN + 9,
+ BPF_RET + BPF_K,
+ SECCOMP_RET_KILL);
+
+ free(actual.filter);
+}
+
+TEST(FilterTest, invalid_name) {
+ struct sock_fprog actual;
+ const char *policy = "notasyscall: 1\n";
+
+ FILE *policy_file = write_policy_to_pipe(policy, strlen(policy));
+ ASSERT_TRUE(policy_file != NULL);
+
+ int res = compile_filter(policy_file, &actual, NO_LOGGING);
+ fclose(policy_file);
+ ASSERT_NE(res, 0);
+}
+
+TEST(FilterTest, invalid_arg) {
+ struct sock_fprog actual;
+ const char *policy = "open: argnn ==\n";
+
+ FILE *policy_file = write_policy_to_pipe(policy, strlen(policy));
+ ASSERT_TRUE(policy_file != NULL);
+
+ int res = compile_filter(policy_file, &actual, NO_LOGGING);
+ fclose(policy_file);
+ ASSERT_NE(res, 0);
+}
+
+TEST(FilterTest, nonexistent) {
+ struct sock_fprog actual;
+ int res = compile_filter(NULL, &actual, NO_LOGGING);
+ ASSERT_NE(res, 0);
+}
+
+TEST(FilterTest, log) {
+ struct sock_fprog actual;
+ const char *policy =
+ "read: 1\n"
+ "write: 1\n"
+ "rt_sigreturn: 1\n"
+ "exit: 1\n";
+
+ FILE *policy_file = write_policy_to_pipe(policy, strlen(policy));
+ ASSERT_TRUE(policy_file != NULL);
+
+ int res = compile_filter(policy_file, &actual, USE_LOGGING);
+ fclose(policy_file);
+
+ size_t i;
+ size_t index = 0;
+ /*
+ * Checks return value, filter length, and that the filter
+ * validates arch, loads syscall number, only allows expected syscalls,
+ * and returns TRAP on failure.
+ * NOTE(jorgelo): the filter is longer since we add the syscalls needed
+ * for logging.
+ */
+ ASSERT_EQ(res, 0);
+ EXPECT_EQ(actual.len, 13 + 2 * log_syscalls_len);
+ EXPECT_ARCH_VALIDATION(actual.filter);
+ EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN,
+ BPF_LD + BPF_W + BPF_ABS,
+ syscall_nr);
+
+ index = ARCH_VALIDATION_LEN + 1;
+ for (i = 0; i < log_syscalls_len; i++)
+ EXPECT_ALLOW_SYSCALL(actual.filter + (index + 2 * i),
+ lookup_syscall(log_syscalls[i]));
+
+ index += 2 * log_syscalls_len;
+
+ EXPECT_ALLOW_SYSCALL(actual.filter + index, __NR_read);
+ EXPECT_ALLOW_SYSCALL(actual.filter + index + 2, __NR_write);
+ EXPECT_ALLOW_SYSCALL(actual.filter + index + 4, __NR_rt_sigreturn);
+ EXPECT_ALLOW_SYSCALL(actual.filter + index + 6, __NR_exit);
+ EXPECT_EQ_STMT(actual.filter + index + 8, BPF_RET + BPF_K, SECCOMP_RET_TRAP);
+
+ free(actual.filter);
+}