[linux-2.6-block.git] / lib / test_printf.c

/*
 * 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/rtc.h>
#include <linux/slab.h>
#include <linux/string.h>

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

#include <linux/gfp.h>
#include <linux/mm.h>

#define BUF_SIZE 256
#define PAD_SIZE 16
#define FILL_CHAR '$'

static unsigned total_tests __initdata;
static unsigned failed_tests __initdata;
static char *test_buffer __initdata;
static char *alloced_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(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_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 (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
		return 1;
	}

	if (!bufsize) {
		if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_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 (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
		pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\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;

	if (elen >= BUF_SIZE) {
		pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
		       elen, fmt);
		failed_tests++;
		return;
	}

	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) {
		total_tests++;
		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);
	test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
	test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
	test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
	/*
	 * POSIX/C99: »The result of converting zero with an explicit
	 * precision of zero shall be no characters.« Hence the output
	 * from the below test should really be "00|0||| ". However,
	 * the kernel's printf also produces a single 0 in that
	 * case. This test case simply documents the current
	 * behaviour.
	 */
	test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
#ifndef __CHAR_UNSIGNED__
	{
		/*
		 * Passing a 'char' to a %02x specifier doesn't do
		 * what was presumably the intention when char is
		 * signed and the value is negative. One must either &
		 * with 0xff or cast to u8.
		 */
		char val = -16;
		test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
	}
#endif
}

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");
	test("1234      ", "%-10.4s", "123456");
	test("      1234", "%10.4s", "123456");
	/*
	 * POSIX and C99 say that a negative precision (which is only
	 * possible to pass via a * argument) should be treated as if
	 * the precision wasn't present, and that if the precision is
	 * omitted (as in %.s), the precision should be taken to be
	 * 0. However, the kernel's printf behave exactly opposite,
	 * treating a negative precision as 0 and treating an omitted
	 * precision specifier as if no precision was given.
	 *
	 * These test cases document the current behaviour; should
	 * anyone ever feel the need to follow the standards more
	 * closely, this can be revisited.
	 */
	test("    ", "%4.*s", -5, "123456");
	test("123456", "%.s", "123456");
	test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
	test("a  |   |   ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
}

#define PLAIN_BUF_SIZE 64	/* leave some space so we don't oops */

#if BITS_PER_LONG == 64

#define PTR_WIDTH 16
#define PTR ((void *)0xffff0123456789abUL)
#define PTR_STR "ffff0123456789ab"
#define PTR_VAL_NO_CRNG "(____ptrval____)"
#define ZEROS "00000000"	/* hex 32 zero bits */

static int __init
plain_format(void)
{
	char buf[PLAIN_BUF_SIZE];
	int nchars;

	nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);

	if (nchars != PTR_WIDTH)
		return -1;

	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
			PTR_VAL_NO_CRNG);
		return 0;
	}

	if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
		return -1;

	return 0;
}

#else

#define PTR_WIDTH 8
#define PTR ((void *)0x456789ab)
#define PTR_STR "456789ab"
#define PTR_VAL_NO_CRNG "(ptrval)"

static int __init
plain_format(void)
{
	/* Format is implicitly tested for 32 bit machines by plain_hash() */
	return 0;
}

#endif	/* BITS_PER_LONG == 64 */

static int __init
plain_hash_to_buffer(const void *p, char *buf, size_t len)
{
	int nchars;

	nchars = snprintf(buf, len, "%p", p);

	if (nchars != PTR_WIDTH)
		return -1;

	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
		pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
			PTR_VAL_NO_CRNG);
		return 0;
	}

	return 0;
}


static int __init
plain_hash(void)
{
	char buf[PLAIN_BUF_SIZE];
	int ret;

	ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
	if (ret)
		return ret;

	if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
		return -1;

	return 0;
}

/*
 * We can't use test() to test %p because we don't know what output to expect
 * after an address is hashed.
 */
static void __init
plain(void)
{
	int err;

	err = plain_hash();
	if (err) {
		pr_warn("plain 'p' does not appear to be hashed\n");
		failed_tests++;
		return;
	}

	err = plain_format();
	if (err) {
		pr_warn("hashing plain 'p' has unexpected format\n");
		failed_tests++;
	}
}

static void __init
test_hashed(const char *fmt, const void *p)
{
	char buf[PLAIN_BUF_SIZE];
	int ret;

	/*
	 * No need to increase failed test counter since this is assumed
	 * to be called after plain().
	 */
	ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
	if (ret)
		return;

	test(buf, fmt, p);
}

static void __init
symbol_ptr(void)
{
}

static void __init
kernel_ptr(void)
{
	/* We can't test this without access to kptr_restrict. */
}

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 struct dentry test_dentry[4] __initdata = {
	{ .d_parent = &test_dentry[0],
	  .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
	  .d_iname = "foo" },
	{ .d_parent = &test_dentry[0],
	  .d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
	  .d_iname = "bravo" },
	{ .d_parent = &test_dentry[1],
	  .d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
	  .d_iname = "alfa" },
	{ .d_parent = &test_dentry[2],
	  .d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
	  .d_iname = "romeo" },
};

static void __init
dentry(void)
{
	test("foo", "%pd", &test_dentry[0]);
	test("foo", "%pd2", &test_dentry[0]);

	test("romeo", "%pd", &test_dentry[3]);
	test("alfa/romeo", "%pd2", &test_dentry[3]);
	test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
	test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
	test("/bravo/alfa", "%pd4", &test_dentry[2]);

	test("bravo/alfa  |bravo/alfa  ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
	test("  bravo/alfa|  bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
}

static void __init
struct_va_format(void)
{
}

static void __init
struct_rtc_time(void)
{
	/* 1543210543 */
	const struct rtc_time tm = {
		.tm_sec = 43,
		.tm_min = 35,
		.tm_hour = 5,
		.tm_mday = 26,
		.tm_mon = 10,
		.tm_year = 118,
	};

	test_hashed("%pt", &tm);

	test("2018-11-26T05:35:43", "%ptR", &tm);
	test("0118-10-26T05:35:43", "%ptRr", &tm);
	test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
	test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
	test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
	test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
}

static void __init
struct_clk(void)
{
}

static void __init
large_bitmap(void)
{
	const int nbits = 1 << 16;
	unsigned long *bits = kcalloc(BITS_TO_LONGS(nbits), sizeof(long), GFP_KERNEL);
	if (!bits)
		return;

	bitmap_set(bits, 1, 20);
	bitmap_set(bits, 60000, 15);
	test("1-20,60000-60014", "%*pbl", nbits, bits);
	kfree(bits);
}

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);

	large_bitmap();
}

static void __init
netdev_features(void)
{
}

static void __init
flags(void)
{
	unsigned long flags;
	gfp_t gfp;
	char *cmp_buffer;

	flags = 0;
	test("", "%pGp", &flags);

	/* Page flags should filter the zone id */
	flags = 1UL << NR_PAGEFLAGS;
	test("", "%pGp", &flags);

	flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
		| 1UL << PG_active | 1UL << PG_swapbacked;
	test("uptodate|dirty|lru|active|swapbacked", "%pGp", &flags);


	flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC
			| VM_DENYWRITE;
	test("read|exec|mayread|maywrite|mayexec|denywrite", "%pGv", &flags);

	gfp = GFP_TRANSHUGE;
	test("GFP_TRANSHUGE", "%pGg", &gfp);

	gfp = GFP_ATOMIC|__GFP_DMA;
	test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);

	gfp = __GFP_ATOMIC;
	test("__GFP_ATOMIC", "%pGg", &gfp);

	cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
	if (!cmp_buffer)
		return;

	/* Any flags not translated by the table should remain numeric */
	gfp = ~__GFP_BITS_MASK;
	snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
	test(cmp_buffer, "%pGg", &gfp);

	snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
							(unsigned long) gfp);
	gfp |= __GFP_ATOMIC;
	test(cmp_buffer, "%pGg", &gfp);

	kfree(cmp_buffer);
}

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_rtc_time();
	struct_clk();
	bitmap();
	netdev_features();
	flags();
}

static int __init
test_printf_init(void)
{
	alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
	if (!alloced_buffer)
		return -ENOMEM;
	test_buffer = alloced_buffer + PAD_SIZE;

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

	kfree(alloced_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");
Commit	Line	Data
707cc728 RV	1	/*
	2	* Test cases for printf facility.
	3	*/
	4
	5	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	6
	7	#include <linux/init.h>
	8	#include <linux/kernel.h>
	9	#include <linux/module.h>
	10	#include <linux/printk.h>
	11	#include <linux/random.h>
4d42c447	12	#include <linux/rtc.h>
707cc728 RV	13	#include <linux/slab.h>
	14	#include <linux/string.h>
	15
857cca4d	16	#include <linux/bitmap.h>
251c7234	17	#include <linux/dcache.h>
707cc728 RV	18	#include <linux/socket.h>
	19	#include <linux/in.h>
	20
edf14cdb VB	21	#include <linux/gfp.h>
	22	#include <linux/mm.h>
	23
707cc728	24	#define BUF_SIZE 256
331e4deb	25	#define PAD_SIZE 16
707cc728 RV	26	#define FILL_CHAR '$'
707cc728 RV	27
707cc728 RV	28	static unsigned total_tests __initdata;
	29	static unsigned failed_tests __initdata;
	30	static char *test_buffer __initdata;
331e4deb	31	static char *alloced_buffer __initdata;
707cc728 RV	32
	33	static int __printf(4, 0) __init
	34	do_test(int bufsize, const char *expect, int elen,
	35	const char *fmt, va_list ap)
	36	{
	37	va_list aq;
	38	int ret, written;
	39
	40	total_tests++;
	41
331e4deb	42	memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
707cc728 RV	43	va_copy(aq, ap);
	44	ret = vsnprintf(test_buffer, bufsize, fmt, aq);
	45	va_end(aq);
	46
	47	if (ret != elen) {
	48	pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
	49	bufsize, fmt, ret, elen);
	50	return 1;
	51	}
	52
331e4deb RV	53	if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
	54	pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
	55	return 1;
	56	}
	57
707cc728	58	if (!bufsize) {
331e4deb	59	if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
707cc728 RV	60	pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
	61	fmt);
	62	return 1;
	63	}
	64	return 0;
	65	}
	66
	67	written = min(bufsize-1, elen);
	68	if (test_buffer[written]) {
	69	pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
	70	bufsize, fmt);
	71	return 1;
	72	}
	73
331e4deb RV	74	if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
	75	pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
	76	bufsize, fmt);
	77	return 1;
	78	}
	79
707cc728 RV	80	if (memcmp(test_buffer, expect, written)) {
	81	pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
	82	bufsize, fmt, test_buffer, written, expect);
	83	return 1;
	84	}
	85	return 0;
	86	}
	87
	88	static void __printf(3, 4) __init
	89	__test(const char expect, int elen, const char fmt, ...)
	90	{
	91	va_list ap;
	92	int rand;
	93	char *p;
	94
fd0515d5 RV	95	if (elen >= BUF_SIZE) {
	96	pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
	97	elen, fmt);
	98	failed_tests++;
	99	return;
	100	}
707cc728 RV	101
	102	va_start(ap, fmt);
	103
	104	/*
	105	* Every fmt+args is subjected to four tests: Three where we
	106	* tell vsnprintf varying buffer sizes (plenty, not quite
	107	* enough and 0), and then we also test that kvasprintf would
	108	* be able to print it as expected.
	109	*/
	110	failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
	111	rand = 1 + prandom_u32_max(elen+1);
	112	/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
	113	failed_tests += do_test(rand, expect, elen, fmt, ap);
	114	failed_tests += do_test(0, expect, elen, fmt, ap);
	115
	116	p = kvasprintf(GFP_KERNEL, fmt, ap);
	117	if (p) {
b79a7db3	118	total_tests++;
707cc728 RV	119	if (memcmp(p, expect, elen+1)) {
	120	pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
	121	fmt, p, expect);
	122	failed_tests++;
	123	}
	124	kfree(p);
	125	}
	126	va_end(ap);
	127	}
	128
	129	#define test(expect, fmt, ...) \
	130	__test(expect, strlen(expect), fmt, ##__VA_ARGS__)
	131
	132	static void __init
	133	test_basic(void)
	134	{
	135	/* Work around annoying "warning: zero-length gnu_printf format string". */
	136	char nul = '\0';
	137
	138	test("", &nul);
	139	test("100%", "100%%");
	140	test("xxx%yyy", "xxx%cyyy", '%');
	141	__test("xxx\0yyy", 7, "xxx%cyyy", '\0');
	142	}
	143
	144	static void __init
	145	test_number(void)
	146	{
	147	test("0x1234abcd ", "%#-12x", 0x1234abcd);
	148	test(" 0x1234abcd", "%#12x", 0x1234abcd);
	149	test("0\|001\| 12\|+123\| 1234\|-123\|-1234", "%d\|%03d\|%3d\|%+d\|% d\|%+d\|% d", 0, 1, 12, 123, 1234, -123, -1234);
1ca8e8eb RV	150	test("0\|1\|1\|128\|255", "%hhu\|%hhu\|%hhu\|%hhu\|%hhu", 0, 1, 257, 128, -1);
	151	test("0\|1\|1\|-128\|-1", "%hhd\|%hhd\|%hhd\|%hhd\|%hhd", 0, 1, 257, 128, -1);
	152	test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
	153	/*
	154	* POSIX/C99: »The result of converting zero with an explicit
	155	* precision of zero shall be no characters.« Hence the output
	156	* from the below test should really be "00\|0\|\|\| ". However,
	157	* the kernel's printf also produces a single 0 in that
	158	* case. This test case simply documents the current
	159	* behaviour.
	160	*/
	161	test("00\|0\|0\|0\|0", "%.2d\|%.1d\|%.0d\|%.*d\|%1.0d", 0, 0, 0, 0, 0, 0);
	162	#ifndef __CHAR_UNSIGNED__
	163	{
	164	/*
	165	* Passing a 'char' to a %02x specifier doesn't do
	166	* what was presumably the intention when char is
	167	* signed and the value is negative. One must either &
	168	* with 0xff or cast to u8.
	169	*/
	170	char val = -16;
	171	test("0xfffffff0\|0xf0\|0xf0", "%#02x\|%#02x\|%#02x", val, val & 0xff, (u8)val);
	172	}
	173	#endif
707cc728 RV	174	}
	175
	176	static void __init
	177	test_string(void)
	178	{
	179	test("", "%s%.0s", "", "123");
	180	test("ABCD\|abc\|123", "%s\|%.3s\|%.*s", "ABCD", "abcdef", 3, "123456");
	181	test("1 \| 2\|3 \| 4\|5 ", "%-3s\|%3s\|%-s\|%s\|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
f176eb4c RV	182	test("1234 ", "%-10.4s", "123456");
f176eb4c RV	183	test(" 1234", "%10.4s", "123456");
707cc728	184	/*
f176eb4c RV	185	* POSIX and C99 say that a negative precision (which is only
	186	* possible to pass via a * argument) should be treated as if
	187	* the precision wasn't present, and that if the precision is
	188	* omitted (as in %.s), the precision should be taken to be
	189	* 0. However, the kernel's printf behave exactly opposite,
	190	* treating a negative precision as 0 and treating an omitted
	191	* precision specifier as if no precision was given.
	192	*
	193	* These test cases document the current behaviour; should
	194	* anyone ever feel the need to follow the standards more
	195	* closely, this can be revisited.
707cc728	196	*/
f176eb4c RV	197	test(" ", "%4.*s", -5, "123456");
f176eb4c RV	198	test("123456", "%.s", "123456");
707cc728 RV	199	test("a\|\|", "%.s\|%.0s\|%.*s", "a", "b", 0, "c");
	200	test("a \| \| ", "%-3.s\|%-3.0s\|%-3.*s", "a", "b", 0, "c");
	201	}
	202
ad67b74d TH	203	#define PLAIN_BUF_SIZE 64 /* leave some space so we don't oops */
	204
	205	#if BITS_PER_LONG == 64
	206
	207	#define PTR_WIDTH 16
c604b407	208	#define PTR ((void *)0xffff0123456789abUL)
ad67b74d	209	#define PTR_STR "ffff0123456789ab"
ce041c43	210	#define PTR_VAL_NO_CRNG "(____ptrval____)"
ad67b74d TH	211	#define ZEROS "00000000" /* hex 32 zero bits */
	212
	213	static int __init
	214	plain_format(void)
	215	{
	216	char buf[PLAIN_BUF_SIZE];
	217	int nchars;
	218
	219	nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
	220
ce041c43 TE	221	if (nchars != PTR_WIDTH)
	222	return -1;
	223
	224	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
	225	pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
	226	PTR_VAL_NO_CRNG);
	227	return 0;
	228	}
	229
	230	if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
ad67b74d TH	231	return -1;
	232
	233	return 0;
	234	}
	235
	236	#else
	237
	238	#define PTR_WIDTH 8
	239	#define PTR ((void *)0x456789ab)
	240	#define PTR_STR "456789ab"
ce041c43	241	#define PTR_VAL_NO_CRNG "(ptrval)"
ad67b74d TH	242
	243	static int __init
	244	plain_format(void)
	245	{
	246	/* Format is implicitly tested for 32 bit machines by plain_hash() */
	247	return 0;
	248	}
	249
	250	#endif /* BITS_PER_LONG == 64 */
	251
	252	static int __init
4d42c447	253	plain_hash_to_buffer(const void p, char buf, size_t len)
ad67b74d	254	{
ad67b74d TH	255	int nchars;
ad67b74d TH	256
4d42c447	257	nchars = snprintf(buf, len, "%p", p);
ad67b74d	258
ce041c43 TE	259	if (nchars != PTR_WIDTH)
	260	return -1;
	261
	262	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
	263	pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
	264	PTR_VAL_NO_CRNG);
	265	return 0;
	266	}
	267
4d42c447 AS	268	return 0;
	269	}
	270
	271
	272	static int __init
	273	plain_hash(void)
	274	{
	275	char buf[PLAIN_BUF_SIZE];
	276	int ret;
	277
	278	ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
	279	if (ret)
	280	return ret;
	281
ce041c43	282	if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
ad67b74d TH	283	return -1;
	284
	285	return 0;
	286	}
	287
	288	/*
	289	* We can't use test() to test %p because we don't know what output to expect
	290	* after an address is hashed.
	291	*/
707cc728 RV	292	static void __init
	293	plain(void)
	294	{
ad67b74d	295	int err;
707cc728	296
ad67b74d TH	297	err = plain_hash();
	298	if (err) {
	299	pr_warn("plain 'p' does not appear to be hashed\n");
	300	failed_tests++;
	301	return;
	302	}
	303
	304	err = plain_format();
	305	if (err) {
	306	pr_warn("hashing plain 'p' has unexpected format\n");
	307	failed_tests++;
	308	}
707cc728 RV	309	}
707cc728 RV	310
4d42c447 AS	311	static void __init
	312	test_hashed(const char fmt, const void p)
	313	{
	314	char buf[PLAIN_BUF_SIZE];
	315	int ret;
	316
	317	/*
	318	* No need to increase failed test counter since this is assumed
	319	* to be called after plain().
	320	*/
	321	ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
	322	if (ret)
	323	return;
	324
	325	test(buf, fmt, p);
	326	}
	327
707cc728 RV	328	static void __init
	329	symbol_ptr(void)
	330	{
	331	}
	332
	333	static void __init
	334	kernel_ptr(void)
	335	{
ad67b74d	336	/* We can't test this without access to kptr_restrict. */
707cc728 RV	337	}
	338
	339	static void __init
	340	struct_resource(void)
	341	{
	342	}
	343
	344	static void __init
	345	addr(void)
	346	{
	347	}
	348
	349	static void __init
	350	escaped_str(void)
	351	{
	352	}
	353
	354	static void __init
	355	hex_string(void)
	356	{
	357	const char buf[3] = {0xc0, 0xff, 0xee};
	358
	359	test("c0 ff ee\|c0:ff:ee\|c0-ff-ee\|c0ffee",
	360	"%3ph\|%3phC\|%3phD\|%3phN", buf, buf, buf, buf);
	361	test("c0 ff ee\|c0:ff:ee\|c0-ff-ee\|c0ffee",
	362	"%ph\|%phC\|%phD\|%phN", 3, buf, 3, buf, 3, buf, 3, buf);
	363	}
	364
	365	static void __init
	366	mac(void)
	367	{
	368	const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
	369
	370	test("2d:48:d6:fc:7a:05", "%pM", addr);
	371	test("05:7a:fc:d6:48:2d", "%pMR", addr);
	372	test("2d-48-d6-fc-7a-05", "%pMF", addr);
	373	test("2d48d6fc7a05", "%pm", addr);
	374	test("057afcd6482d", "%pmR", addr);
	375	}
	376
	377	static void __init
	378	ip4(void)
	379	{
	380	struct sockaddr_in sa;
	381
	382	sa.sin_family = AF_INET;
	383	sa.sin_port = cpu_to_be16(12345);
	384	sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
	385
	386	test("127.000.000.001\|127.0.0.1", "%pi4\|%pI4", &sa.sin_addr, &sa.sin_addr);
	387	test("127.000.000.001\|127.0.0.1", "%piS\|%pIS", &sa, &sa);
	388	sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
	389	test("001.002.003.004:12345\|1.2.3.4:12345", "%piSp\|%pISp", &sa, &sa);
	390	}
	391
	392	static void __init
	393	ip6(void)
	394	{
	395	}
	396
	397	static void __init
	398	ip(void)
	399	{
	400	ip4();
401	ip6();
402	}
403
404	static void __init
405	uuid(void)
406	{
407	const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
408	0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
409
410	test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
411	test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
412	test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
413	test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
414	}
415
251c7234 RV	416	static struct dentry test_dentry[4] __initdata = {
	417	{ .d_parent = &test_dentry[0],
	418	.d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
	419	.d_iname = "foo" },
	420	{ .d_parent = &test_dentry[0],
	421	.d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
	422	.d_iname = "bravo" },
	423	{ .d_parent = &test_dentry[1],
	424	.d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
	425	.d_iname = "alfa" },
	426	{ .d_parent = &test_dentry[2],
	427	.d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
	428	.d_iname = "romeo" },
	429	};
	430
707cc728 RV	431	static void __init
	432	dentry(void)
	433	{
251c7234 RV	434	test("foo", "%pd", &test_dentry[0]);
	435	test("foo", "%pd2", &test_dentry[0]);
	436
	437	test("romeo", "%pd", &test_dentry[3]);
	438	test("alfa/romeo", "%pd2", &test_dentry[3]);
	439	test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
	440	test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
	441	test("/bravo/alfa", "%pd4", &test_dentry[2]);
	442
	443	test("bravo/alfa \|bravo/alfa ", "%-12pd2\|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
	444	test(" bravo/alfa\| bravo/alfa", "%12pd2\|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
707cc728 RV	445	}
	446
	447	static void __init
	448	struct_va_format(void)
	449	{
	450	}
	451
4d42c447 AS	452	static void __init
	453	struct_rtc_time(void)
	454	{
	455	/* 1543210543 */
	456	const struct rtc_time tm = {
	457	.tm_sec = 43,
	458	.tm_min = 35,
	459	.tm_hour = 5,
	460	.tm_mday = 26,
	461	.tm_mon = 10,
	462	.tm_year = 118,
	463	};
	464
	465	test_hashed("%pt", &tm);
	466
	467	test("2018-11-26T05:35:43", "%ptR", &tm);
	468	test("0118-10-26T05:35:43", "%ptRr", &tm);
	469	test("05:35:43\|2018-11-26", "%ptRt\|%ptRd", &tm, &tm);
	470	test("05:35:43\|0118-10-26", "%ptRtr\|%ptRdr", &tm, &tm);
	471	test("05:35:43\|2018-11-26", "%ptRttr\|%ptRdtr", &tm, &tm);
	472	test("05:35:43 tr\|2018-11-26 tr", "%ptRt tr\|%ptRd tr", &tm, &tm);
	473	}
	474
707cc728 RV	475	static void __init
	476	struct_clk(void)
	477	{
	478	}
	479
857cca4d RV	480	static void __init
	481	large_bitmap(void)
	482	{
	483	const int nbits = 1 << 16;
	484	unsigned long *bits = kcalloc(BITS_TO_LONGS(nbits), sizeof(long), GFP_KERNEL);
	485	if (!bits)
	486	return;
	487
	488	bitmap_set(bits, 1, 20);
	489	bitmap_set(bits, 60000, 15);
	490	test("1-20,60000-60014", "%*pbl", nbits, bits);
	491	kfree(bits);
	492	}
	493
707cc728 RV	494	static void __init
	495	bitmap(void)
	496	{
	497	DECLARE_BITMAP(bits, 20);
	498	const int primes[] = {2,3,5,7,11,13,17,19};
	499	int i;
	500
	501	bitmap_zero(bits, 20);
	502	test("00000\|00000", "%20pb\|%*pb", bits, 20, bits);
	503	test("\|", "%20pbl\|%*pbl", bits, 20, bits);
	504
	505	for (i = 0; i < ARRAY_SIZE(primes); ++i)
	506	set_bit(primes[i], bits);
	507	test("a28ac\|a28ac", "%20pb\|%*pb", bits, 20, bits);
	508	test("2-3,5,7,11,13,17,19\|2-3,5,7,11,13,17,19", "%20pbl\|%*pbl", bits, 20, bits);
	509
	510	bitmap_fill(bits, 20);
	511	test("fffff\|fffff", "%20pb\|%*pb", bits, 20, bits);
	512	test("0-19\|0-19", "%20pbl\|%*pbl", bits, 20, bits);
857cca4d RV	513
857cca4d RV	514	large_bitmap();
707cc728 RV	515	}
	516
	517	static void __init
	518	netdev_features(void)
	519	{
	520	}
	521
edf14cdb VB	522	static void __init
	523	flags(void)
	524	{
	525	unsigned long flags;
	526	gfp_t gfp;
	527	char *cmp_buffer;
	528
	529	flags = 0;
	530	test("", "%pGp", &flags);
	531
	532	/* Page flags should filter the zone id */
	533	flags = 1UL << NR_PAGEFLAGS;
	534	test("", "%pGp", &flags);
	535
	536	flags \|= 1UL << PG_uptodate \| 1UL << PG_dirty \| 1UL << PG_lru
	537	\| 1UL << PG_active \| 1UL << PG_swapbacked;
	538	test("uptodate\|dirty\|lru\|active\|swapbacked", "%pGp", &flags);
	539
	540
	541	flags = VM_READ \| VM_EXEC \| VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC
	542	\| VM_DENYWRITE;
	543	test("read\|exec\|mayread\|maywrite\|mayexec\|denywrite", "%pGv", &flags);
	544
	545	gfp = GFP_TRANSHUGE;
	546	test("GFP_TRANSHUGE", "%pGg", &gfp);
	547
	548	gfp = GFP_ATOMIC\|__GFP_DMA;
	549	test("GFP_ATOMIC\|GFP_DMA", "%pGg", &gfp);
	550
	551	gfp = __GFP_ATOMIC;
	552	test("__GFP_ATOMIC", "%pGg", &gfp);
	553
	554	cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
	555	if (!cmp_buffer)
	556	return;
	557
	558	/* Any flags not translated by the table should remain numeric */
	559	gfp = ~__GFP_BITS_MASK;
	560	snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
	561	test(cmp_buffer, "%pGg", &gfp);
	562
	563	snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC\|%#lx",
	564	(unsigned long) gfp);
	565	gfp \|= __GFP_ATOMIC;
	566	test(cmp_buffer, "%pGg", &gfp);
	567
	568	kfree(cmp_buffer);
	569	}
	570
707cc728 RV	571	static void __init
	572	test_pointer(void)
	573	{
	574	plain();
	575	symbol_ptr();
	576	kernel_ptr();
	577	struct_resource();
	578	addr();
	579	escaped_str();
	580	hex_string();
	581	mac();
	582	ip();
	583	uuid();
	584	dentry();
	585	struct_va_format();
4d42c447	586	struct_rtc_time();
707cc728 RV	587	struct_clk();
	588	bitmap();
	589	netdev_features();
edf14cdb	590	flags();
707cc728 RV	591	}
	592
	593	static int __init
	594	test_printf_init(void)
	595	{
331e4deb RV	596	alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
331e4deb RV	597	if (!alloced_buffer)
707cc728	598	return -ENOMEM;
331e4deb	599	test_buffer = alloced_buffer + PAD_SIZE;
707cc728 RV	600
	601	test_basic();
	602	test_number();
	603	test_string();
	604	test_pointer();
	605
331e4deb	606	kfree(alloced_buffer);
707cc728 RV	607
	608	if (failed_tests == 0)
	609	pr_info("all %u tests passed\n", total_tests);
	610	else
	611	pr_warn("failed %u out of %u tests\n", failed_tests, total_tests);
	612
	613	return failed_tests ? -EINVAL : 0;
	614	}
	615
	616	module_init(test_printf_init);
	617
	618	MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
	619	MODULE_LICENSE("GPL");