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platform_bionic/tests/async_safe_test.cpp
Christopher Ferris 35759fa84c Fix mte build breakage. 
The strerror_buf is way too large, so instead of using a separate
buffer for just this string, reuse the already existing buffer.
Increase the buffer size to cover the maximum errno string.

Add a unit test to verify that none of the errno values are cut off
in the async_safe_format_buffer function when passing %m.

Bug: 274474681

Test: New unit test passes.
Test: Changing the buffer to a small value and verify that the test fails.
Change-Id: I4cb4652709582a8a6b958e12de5d923ec950e6b6
2023-03-21 18:11:02 +00:00

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/*
* Copyright (C) 2012 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.
*/
#include <gtest/gtest.h>
#include <errno.h>
#if defined(__BIONIC__)
#include <async_safe/log.h>
#endif // __BIONIC__
TEST(async_safe_log, smoke) {
#if defined(__BIONIC__)
char buf[BUFSIZ];
async_safe_format_buffer(buf, sizeof(buf), "a");
EXPECT_STREQ("a", buf);
async_safe_format_buffer(buf, sizeof(buf), "%%");
EXPECT_STREQ("%", buf);
async_safe_format_buffer(buf, sizeof(buf), "01234");
EXPECT_STREQ("01234", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%sb", "01234");
EXPECT_STREQ("a01234b", buf);
char* s = nullptr;
async_safe_format_buffer(buf, sizeof(buf), "a%sb", s);
EXPECT_STREQ("a(null)b", buf);
async_safe_format_buffer(buf, sizeof(buf), "aa%scc", "bb");
EXPECT_STREQ("aabbcc", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%cc", 'b');
EXPECT_STREQ("abc", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%db", 1234);
EXPECT_STREQ("a1234b", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%db", -8123);
EXPECT_STREQ("a-8123b", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%hdb", static_cast<short>(0x7fff0010));
EXPECT_STREQ("a16b", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%hhdb", static_cast<char>(0x7fffff10));
EXPECT_STREQ("a16b", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%lldb", 0x1000000000LL);
EXPECT_STREQ("a68719476736b", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%ldb", 70000L);
EXPECT_STREQ("a70000b", buf);
errno = EINVAL;
async_safe_format_buffer(buf, sizeof(buf), "a%mZ");
EXPECT_STREQ("aInvalid argumentZ", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%pb", reinterpret_cast<void*>(0xb0001234));
EXPECT_STREQ("a0xb0001234b", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%xz", 0x12ab);
EXPECT_STREQ("a12abz", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%Xz", 0x12ab);
EXPECT_STREQ("a12ABz", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%08xz", 0x123456);
EXPECT_STREQ("a00123456z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%5dz", 1234);
EXPECT_STREQ("a 1234z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%05dz", 1234);
EXPECT_STREQ("a01234z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%8dz", 1234);
EXPECT_STREQ("a 1234z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%-8dz", 1234);
EXPECT_STREQ("a1234 z", buf);
async_safe_format_buffer(buf, sizeof(buf), "A%-11sZ", "abcdef");
EXPECT_STREQ("Aabcdef Z", buf);
async_safe_format_buffer(buf, sizeof(buf), "A%s:%dZ", "hello", 1234);
EXPECT_STREQ("Ahello:1234Z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%03d:%d:%02dz", 5, 5, 5);
EXPECT_STREQ("a005:5:05z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%#xZ", 34);
EXPECT_STREQ("a0x22Z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%#xZ", 0);
EXPECT_STREQ("a0Z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%#5xZ", 20);
EXPECT_STREQ("a 0x14Z", buf);
snprintf(buf, sizeof(buf), "a%#08.8xZ", 1);
EXPECT_STREQ("a0x00000001Z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%#oZ", 777);
EXPECT_STREQ("a01411Z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%#oZ", 0);
EXPECT_STREQ("a0Z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%#6oZ", 15);
EXPECT_STREQ("a 017Z", buf);
snprintf(buf, sizeof(buf), "a%#08.8oZ", 11);
EXPECT_STREQ("a00000013Z", buf);
void* p = nullptr;
async_safe_format_buffer(buf, sizeof(buf), "a%d,%pz", 5, p);
EXPECT_STREQ("a5,0x0z", buf);
async_safe_format_buffer(buf, sizeof(buf), "a%lld,%d,%d,%dz", 0x1000000000LL, 6, 7, 8);
EXPECT_STREQ("a68719476736,6,7,8z", buf);
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
TEST(async_safe_log, d_INT_MAX) {
#if defined(__BIONIC__)
char buf[BUFSIZ];
async_safe_format_buffer(buf, sizeof(buf), "%d", INT_MAX);
EXPECT_STREQ("2147483647", buf);
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
TEST(async_safe_log, d_INT_MIN) {
#if defined(__BIONIC__)
char buf[BUFSIZ];
async_safe_format_buffer(buf, sizeof(buf), "%d", INT_MIN);
EXPECT_STREQ("-2147483648", buf);
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
TEST(async_safe_log, ld_LONG_MAX) {
#if defined(__BIONIC__)
char buf[BUFSIZ];
async_safe_format_buffer(buf, sizeof(buf), "%ld", LONG_MAX);
#if defined(__LP64__)
EXPECT_STREQ("9223372036854775807", buf);
#else
EXPECT_STREQ("2147483647", buf);
#endif
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
TEST(async_safe_log, ld_LONG_MIN) {
#if defined(__BIONIC__)
char buf[BUFSIZ];
async_safe_format_buffer(buf, sizeof(buf), "%ld", LONG_MIN);
#if defined(__LP64__)
EXPECT_STREQ("-9223372036854775808", buf);
#else
EXPECT_STREQ("-2147483648", buf);
#endif
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
TEST(async_safe_log, lld_LLONG_MAX) {
#if defined(__BIONIC__)
char buf[BUFSIZ];
async_safe_format_buffer(buf, sizeof(buf), "%lld", LLONG_MAX);
EXPECT_STREQ("9223372036854775807", buf);
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
TEST(async_safe_log, lld_LLONG_MIN) {
#if defined(__BIONIC__)
char buf[BUFSIZ];
async_safe_format_buffer(buf, sizeof(buf), "%lld", LLONG_MIN);
EXPECT_STREQ("-9223372036854775808", buf);
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
TEST(async_safe_log, buffer_overrun) {
#if defined(__BIONIC__)
char buf[BUFSIZ];
ASSERT_EQ(11, async_safe_format_buffer(buf, sizeof(buf), "hello %s", "world"));
EXPECT_STREQ("hello world", buf);
ASSERT_EQ(11, async_safe_format_buffer(buf, 8, "hello %s", "world"));
EXPECT_STREQ("hello w", buf);
ASSERT_EQ(11, async_safe_format_buffer(buf, 6, "hello %s", "world"));
EXPECT_STREQ("hello", buf);
ASSERT_EQ(4, async_safe_format_buffer(nullptr, 0, "xxxx"));
ASSERT_EQ(4, async_safe_format_buffer(buf, 1, "xxxx"));
EXPECT_STREQ("", buf);
ASSERT_EQ(4, async_safe_format_buffer(buf, 2, "xxxx"));
EXPECT_STREQ("x", buf);
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
// Verify that using %m is never cut off.
TEST(async_safe_format_buffer, percent_m_fits_in_buffer) {
#if defined(__BIONIC__)
for (int i = 0; i < 256; i++) {
errno = i;
char async_buf[256];
async_safe_format_buffer(async_buf, sizeof(async_buf), "%m");
char strerror_buf[1024];
strerror_r(errno, strerror_buf, sizeof(strerror_buf));
ASSERT_STREQ(strerror_buf, async_buf);
}
#else // __BIONIC__
GTEST_SKIP() << "bionic-only test";
#endif // __BIONIC__
}
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