test_printf: test printf family at runtime (707cc728) · Commits · 戴 / test

lib/Kconfig.debug

+3 −0

Original line number	Diff line number	Diff line
		@@ -1686,6 +1686,9 @@ config TEST_STRING_HELPERS
		config TEST_KSTRTOX
		tristate "Test kstrto*() family of functions at runtime"

		config TEST_PRINTF
		tristate "Test printf() family of functions at runtime"

		config TEST_RHASHTABLE
		tristate "Perform selftest on resizable hash table"
		default n

lib/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -42,6 +42,7 @@ obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
		obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
		obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o
		obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
		obj-$(CONFIG_TEST_PRINTF) += test_printf.o

		ifeq ($(CONFIG_DEBUG_KOBJECT),y)
		CFLAGS_kobject.o += -DDEBUG

lib/test_printf.c

0 → 100644

+362 −0

Original line number	Diff line number	Diff line
		/*
		* Test cases for printf facility.
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/printk.h>
		#include <linux/random.h>
		#include <linux/slab.h>
		#include <linux/string.h>

		#include <linux/socket.h>
		#include <linux/in.h>

		#define BUF_SIZE 256
		#define FILL_CHAR '$'

		#define PTR1 ((void*)0x01234567)
		#define PTR2 ((void*)(long)(int)0xfedcba98)

		#if BITS_PER_LONG == 64
		#define PTR1_ZEROES "000000000"
		#define PTR1_SPACES " "
		#define PTR1_STR "1234567"
		#define PTR2_STR "fffffffffedcba98"
		#define PTR_WIDTH 16
		#else
		#define PTR1_ZEROES "0"
		#define PTR1_SPACES " "
		#define PTR1_STR "1234567"
		#define PTR2_STR "fedcba98"
		#define PTR_WIDTH 8
		#endif
		#define PTR_WIDTH_STR stringify(PTR_WIDTH)

		static unsigned total_tests __initdata;
		static unsigned failed_tests __initdata;
		static char *test_buffer __initdata;

		static int __printf(4, 0) __init
		do_test(int bufsize, const char *expect, int elen,
		const char *fmt, va_list ap)
		{
		va_list aq;
		int ret, written;

		total_tests++;

		memset(test_buffer, FILL_CHAR, BUF_SIZE);
		va_copy(aq, ap);
		ret = vsnprintf(test_buffer, bufsize, fmt, aq);
		va_end(aq);

		if (ret != elen) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
		bufsize, fmt, ret, elen);
		return 1;
		}

		if (!bufsize) {
		if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE)) {
		pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
		fmt);
		return 1;
		}
		return 0;
		}

		written = min(bufsize-1, elen);
		if (test_buffer[written]) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
		bufsize, fmt);
		return 1;
		}

		if (memcmp(test_buffer, expect, written)) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
		bufsize, fmt, test_buffer, written, expect);
		return 1;
		}
		return 0;
		}

		static void __printf(3, 4) __init
		__test(const char expect, int elen, const char fmt, ...)
		{
		va_list ap;
		int rand;
		char *p;

		BUG_ON(elen >= BUF_SIZE);

		va_start(ap, fmt);

		/*
		* Every fmt+args is subjected to four tests: Three where we
		* tell vsnprintf varying buffer sizes (plenty, not quite
		* enough and 0), and then we also test that kvasprintf would
		* be able to print it as expected.
		*/
		failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
		rand = 1 + prandom_u32_max(elen+1);
		/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
		failed_tests += do_test(rand, expect, elen, fmt, ap);
		failed_tests += do_test(0, expect, elen, fmt, ap);

		p = kvasprintf(GFP_KERNEL, fmt, ap);
		if (p) {
		if (memcmp(p, expect, elen+1)) {
		pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
		fmt, p, expect);
		failed_tests++;
		}
		kfree(p);
		}
		va_end(ap);
		}

		#define test(expect, fmt, ...) \
		__test(expect, strlen(expect), fmt, ##__VA_ARGS__)

		static void __init
		test_basic(void)
		{
		/* Work around annoying "warning: zero-length gnu_printf format string". */
		char nul = '\0';

		test("", &nul);
		test("100%", "100%%");
		test("xxx%yyy", "xxx%cyyy", '%');
		__test("xxx\0yyy", 7, "xxx%cyyy", '\0');
		}

		static void __init
		test_number(void)
		{
		test("0x1234abcd ", "%#-12x", 0x1234abcd);
		test(" 0x1234abcd", "%#12x", 0x1234abcd);
		test("0\|001\| 12\|+123\| 1234\|-123\|-1234", "%d\|%03d\|%3d\|%+d\|% d\|%+d\|% d", 0, 1, 12, 123, 1234, -123, -1234);
		}

		static void __init
		test_string(void)
		{
		test("", "%s%.0s", "", "123");
		test("ABCD\|abc\|123", "%s\|%.3s\|%.*s", "ABCD", "abcdef", 3, "123456");
		test("1 \| 2\|3 \| 4\|5 ", "%-3s\|%3s\|%-s\|%s\|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
		/*
		* POSIX and C99 say that a missing precision should be
		* treated as a precision of 0. However, the kernel's printf
		* implementation treats this case as if the . wasn't
		* present. Let's add a test case documenting the current
		* behaviour; should anyone ever feel the need to follow the
		* standards more closely, this can be revisited.
		*/
		test("a\|\|", "%.s\|%.0s\|%.*s", "a", "b", 0, "c");
		test("a \| \| ", "%-3.s\|%-3.0s\|%-3.*s", "a", "b", 0, "c");
		}

		static void __init
		plain(void)
		{
		test(PTR1_ZEROES PTR1_STR " " PTR2_STR, "%p %p", PTR1, PTR2);
		/*
		* The field width is overloaded for some %p extensions to
		* pass another piece of information. For plain pointers, the
		* behaviour is slightly odd: One cannot pass either the 0
		* flag nor a precision to %p without gcc complaining, and if
		* one explicitly gives a field width, the number is no longer
		* zero-padded.
		*/
		test("\|" PTR1_STR PTR1_SPACES " \| " PTR1_SPACES PTR1_STR "\|",
		"\|%-p\|%p\|", PTR_WIDTH+2, PTR1, PTR_WIDTH+2, PTR1);
		test("\|" PTR2_STR " \| " PTR2_STR "\|",
		"\|%-p\|%p\|", PTR_WIDTH+2, PTR2, PTR_WIDTH+2, PTR2);

		/*
		* Unrecognized %p extensions are treated as plain %p, but the
		* alphanumeric suffix is ignored (that is, does not occur in
		* the output.)
		*/
		test("\|"PTR1_ZEROES PTR1_STR"\|", "\|%p0y\|", PTR1);
		test("\|"PTR2_STR"\|", "\|%p0y\|", PTR2);
		}

		static void __init
		symbol_ptr(void)
		{
		}

		static void __init
		kernel_ptr(void)
		{
		}

		static void __init
		struct_resource(void)
		{
		}

		static void __init
		addr(void)
		{
		}

		static void __init
		escaped_str(void)
		{
		}

		static void __init
		hex_string(void)
		{
		const char buf[3] = {0xc0, 0xff, 0xee};

		test("c0 ff ee\|c0:ff:ee\|c0-ff-ee\|c0ffee",
		"%3ph\|%3phC\|%3phD\|%3phN", buf, buf, buf, buf);
		test("c0 ff ee\|c0:ff:ee\|c0-ff-ee\|c0ffee",
		"%ph\|%phC\|%phD\|%phN", 3, buf, 3, buf, 3, buf, 3, buf);
		}

		static void __init
		mac(void)
		{
		const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};

		test("2d:48:d6:fc:7a:05", "%pM", addr);
		test("05:7a:fc:d6:48:2d", "%pMR", addr);
		test("2d-48-d6-fc-7a-05", "%pMF", addr);
		test("2d48d6fc7a05", "%pm", addr);
		test("057afcd6482d", "%pmR", addr);
		}

		static void __init
		ip4(void)
		{
		struct sockaddr_in sa;

		sa.sin_family = AF_INET;
		sa.sin_port = cpu_to_be16(12345);
		sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);

		test("127.000.000.001\|127.0.0.1", "%pi4\|%pI4", &sa.sin_addr, &sa.sin_addr);
		test("127.000.000.001\|127.0.0.1", "%piS\|%pIS", &sa, &sa);
		sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
		test("001.002.003.004:12345\|1.2.3.4:12345", "%piSp\|%pISp", &sa, &sa);
		}

		static void __init
		ip6(void)
		{
		}

		static void __init
		ip(void)
		{
		ip4();
		ip6();
		}

		static void __init
		uuid(void)
		{
		const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
		0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};

		test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
		test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
		test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
		test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
		}

		static void __init
		dentry(void)
		{
		}

		static void __init
		struct_va_format(void)
		{
		}

		static void __init
		struct_clk(void)
		{
		}

		static void __init
		bitmap(void)
		{
		DECLARE_BITMAP(bits, 20);
		const int primes[] = {2,3,5,7,11,13,17,19};
		int i;

		bitmap_zero(bits, 20);
		test("00000\|00000", "%20pb\|%*pb", bits, 20, bits);
		test("\|", "%20pbl\|%*pbl", bits, 20, bits);

		for (i = 0; i < ARRAY_SIZE(primes); ++i)
		set_bit(primes[i], bits);
		test("a28ac\|a28ac", "%20pb\|%*pb", bits, 20, bits);
		test("2-3,5,7,11,13,17,19\|2-3,5,7,11,13,17,19", "%20pbl\|%*pbl", bits, 20, bits);

		bitmap_fill(bits, 20);
		test("fffff\|fffff", "%20pb\|%*pb", bits, 20, bits);
		test("0-19\|0-19", "%20pbl\|%*pbl", bits, 20, bits);
		}

		static void __init
		netdev_features(void)
		{
		}

		static void __init
		test_pointer(void)
		{
		plain();
		symbol_ptr();
		kernel_ptr();
		struct_resource();
		addr();
		escaped_str();
		hex_string();
		mac();
		ip();
		uuid();
		dentry();
		struct_va_format();
		struct_clk();
		bitmap();
		netdev_features();
		}

		static int __init
		test_printf_init(void)
		{
		test_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
		if (!test_buffer)
		return -ENOMEM;

		test_basic();
		test_number();
		test_string();
		test_pointer();

		kfree(test_buffer);

		if (failed_tests == 0)
		pr_info("all %u tests passed\n", total_tests);
		else
		pr_warn("failed %u out of %u tests\n", failed_tests, total_tests);

		return failed_tests ? -EINVAL : 0;
		}

		module_init(test_printf_init);

		MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
		MODULE_LICENSE("GPL");

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