// SPDX-License-Identifier: GPL-2.0-only/* * Test cases for printf facility. */ #include <kunit/test.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/sprintf.h>#include <linux/string.h> #include <linux/bitmap.h>#include <linux/dcache.h>#include <linux/socket.h>#include <linux/in.h>#include <linux/in6.h> #include <linux/gfp.h>#include <linux/mm.h> #include <linux/property.h> #define BUF_SIZE 256#define PAD_SIZE 16#define FILL_CHAR '$' #define NOWARN(option, comment, block) \	__diag_push(); \	__diag_ignore_all(#option, comment); \	block \	__diag_pop(); static unsigned int total_tests; static char *test_buffer;static char *alloced_buffer; static void __printf(7, 0)do_test(struct kunit *kunittest, const char *file, const int line, 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) {		KUNIT_FAIL(kunittest,			   "%s:%d: vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",			   file, line, bufsize, fmt, ret, elen);		return;	} 	if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {		KUNIT_FAIL(kunittest,			   "%s:%d: vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n",			   file, line, bufsize, fmt);		return;	} 	if (!bufsize) {		if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {			KUNIT_FAIL(kunittest,				   "%s:%d: vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",				   file, line, fmt);		}		return;	} 	written = min(bufsize-1, elen);	if (test_buffer[written]) {		KUNIT_FAIL(kunittest,			   "%s:%d: vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",			   file, line, bufsize, fmt);		return;	} 	if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize - (written + 1))) {		KUNIT_FAIL(kunittest,			   "%s:%d: vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",			   file, line, bufsize, fmt);		return;	} 	if (memchr_inv(test_buffer + bufsize, FILL_CHAR, BUF_SIZE + PAD_SIZE - bufsize)) {		KUNIT_FAIL(kunittest,			   "%s:%d: vsnprintf(buf, %d, \"%s\", ...) wrote beyond buffer\n",			   file, line, bufsize, fmt);		return;	} 	if (memcmp(test_buffer, expect, written)) {		KUNIT_FAIL(kunittest,			   "%s:%d: vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",			   file, line, bufsize, fmt, test_buffer, written, expect);		return;	}} static void __printf(6, 7)__test(struct kunit *kunittest, const char *file, const int line, const char *expect, int elen,	const char *fmt, ...){	va_list ap;	int rand;	char *p; 	if (elen >= BUF_SIZE) {		KUNIT_FAIL(kunittest,			   "%s:%d: error in test suite: expected length (%d) >= BUF_SIZE (%d). fmt=\"%s\"\n",			   file, line, elen, BUF_SIZE, fmt);		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.	 */	do_test(kunittest, file, line, BUF_SIZE, expect, elen, fmt, ap);	rand = get_random_u32_inclusive(1, elen + 1);	/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */	do_test(kunittest, file, line, rand, expect, elen, fmt, ap);	do_test(kunittest, file, line, 0, expect, elen, fmt, ap); 	p = kvasprintf(GFP_KERNEL, fmt, ap);	if (p) {		total_tests++;		if (memcmp(p, expect, elen+1)) {			KUNIT_FAIL(kunittest,				   "%s:%d: kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",				   file, line, fmt, p, expect);		}		kfree(p);	}	va_end(ap);} #define test(expect, fmt, ...)					\	__test(kunittest, __FILE__, __LINE__, expect, strlen(expect), fmt, ##__VA_ARGS__) static voidtest_basic(struct kunit *kunittest){	/* Work around annoying "warning: zero-length gnu_printf format string". */	char nul = '\0'; 	test("", &nul);	test("100%", "100%%");	test("xxx%yyy", "xxx%cyyy", '%');	__test(kunittest, __FILE__, __LINE__, "xxx\0yyy", 7, "xxx%cyyy", '\0');} static voidtest_number(struct kunit *kunittest){	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);	NOWARN(-Wformat, "Intentionally test narrowing conversion specifiers.", {		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);} static voidtest_string(struct kunit *kunittest){	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 */#define ONES "ffffffff"		/* hex 32 one bits */ #else #define PTR_WIDTH 8#define PTR ((void *)0x456789ab)#define PTR_STR "456789ab"#define PTR_VAL_NO_CRNG "(ptrval)"#define ZEROS ""#define ONES "" #endif	/* BITS_PER_LONG == 64 */ static voidplain_hash_to_buffer(struct kunit *kunittest, const void *p, char *buf, size_t len){	KUNIT_ASSERT_EQ(kunittest, snprintf(buf, len, "%p", p), PTR_WIDTH); 	if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {		kunit_skip(kunittest,			   "crng possibly not yet initialized. plain 'p' buffer contains \"%s\"\n",			   PTR_VAL_NO_CRNG);	}} static voidhash_pointer(struct kunit *kunittest){	if (no_hash_pointers)		kunit_skip(kunittest, "hash pointers disabled"); 	char buf[PLAIN_BUF_SIZE]; 	plain_hash_to_buffer(kunittest, PTR, buf, PLAIN_BUF_SIZE); 	/*	 * The hash of %p is unpredictable, therefore test() cannot be used.	 *	 * Instead verify that the first 32 bits are zeros on a 64-bit system	 * and that the non-hashed value is not printed.	 */ 	KUNIT_EXPECT_MEMEQ(kunittest, buf, ZEROS, strlen(ZEROS));	KUNIT_EXPECT_MEMNEQ(kunittest, buf, PTR_STR, PTR_WIDTH);} /* * This is a macro so that the compiler can compare its arguments to the * __printf() attribute on __test(). This cannot be a function with a __printf() * attribute because GCC requires __printf() functions to be variadic. */#define test_hashed(kunittest, fmt, p)						\	do {									\		char buf[PLAIN_BUF_SIZE];					\		plain_hash_to_buffer(kunittest, p, buf, PLAIN_BUF_SIZE);	\		test(buf, fmt, p);						\	} while (0) /* * NULL pointers aren't hashed. */static voidnull_pointer(struct kunit *kunittest){	test(ZEROS "00000000", "%p", NULL);	test(ZEROS "00000000", "%px", NULL);	test("(null)", "%pE", NULL);} /* * Error pointers aren't hashed. */static voiderror_pointer(struct kunit *kunittest){	test(ONES "fffffff5", "%p", ERR_PTR(-11));	test(ONES "fffffff5", "%px", ERR_PTR(-11));	test("(efault)", "%pE", ERR_PTR(-11));} #define PTR_INVALID ((void *)0x000000ab) static voidinvalid_pointer(struct kunit *kunittest){	test_hashed(kunittest, "%p", PTR_INVALID);	test(ZEROS "000000ab", "%px", PTR_INVALID);	test("(efault)", "%pE", PTR_INVALID);} static voidsymbol_ptr(struct kunit *kunittest){} static voidkernel_ptr(struct kunit *kunittest){	switch (kptr_restrict) {	case 0:		if (no_hash_pointers) {			test(PTR_STR, "%pK", PTR);		} else {			char buf[PLAIN_BUF_SIZE]; 			plain_hash_to_buffer(kunittest, PTR, buf, PLAIN_BUF_SIZE);			/* %pK behaves the same as hashing */			test(buf, "%pK", PTR);		}		break;	case 1:		/* The KUnit kthread has all capabilities, including CAP_SYSLOG */		test(PTR_STR, "%pK", PTR);		break;	case 2:	default:		test(ZEROS "00000000", "%pK", PTR);		break;	}} static voidstruct_resource(struct kunit *kunittest){	struct resource test_resource = {		.start = 0xc0ffee00,		.end = 0xc0ffee00,		.flags = IORESOURCE_MEM,	}; 	test("[mem 0xc0ffee00 flags 0x200]",	     "%pr", &test_resource); 	test_resource = (struct resource) {		.start = 0xc0ffee,		.end = 0xba5eba11,		.flags = IORESOURCE_MEM,	};	test("[mem 0x00c0ffee-0xba5eba11 flags 0x200]",	     "%pr", &test_resource); 	test_resource = (struct resource) {		.start = 0xba5eba11,		.end = 0xc0ffee,		.flags = IORESOURCE_MEM,	};	test("[mem 0xba5eba11-0x00c0ffee flags 0x200]",	     "%pr", &test_resource); 	test_resource = (struct resource) {		.start = 0xba5eba11,		.end = 0xba5eca11,		.flags = IORESOURCE_MEM,	}; 	test("[mem 0xba5eba11-0xba5eca11 flags 0x200]",	     "%pr", &test_resource); 	test_resource = (struct resource) {		.start = 0xba11,		.end = 0xca10,		.flags = IORESOURCE_IO |			 IORESOURCE_DISABLED |			 IORESOURCE_UNSET,	}; 	test("[io  size 0x1000 disabled]",	     "%pR", &test_resource);} static voidstruct_range(struct kunit *kunittest){	struct range test_range = DEFINE_RANGE(0xc0ffee00ba5eba11,					       0xc0ffee00ba5eba11);	test("[range 0xc0ffee00ba5eba11]", "%pra", &test_range); 	test_range = DEFINE_RANGE(0xc0ffee, 0xba5eba11);	test("[range 0x0000000000c0ffee-0x00000000ba5eba11]",	     "%pra", &test_range); 	test_range = DEFINE_RANGE(0xba5eba11, 0xc0ffee);	test("[range 0x00000000ba5eba11-0x0000000000c0ffee]",	     "%pra", &test_range);} static voidaddr(struct kunit *kunittest){} static voidescaped_str(struct kunit *kunittest){} static voidhex_string(struct kunit *kunittest){	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 voidmac(struct kunit *kunittest){	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("05:7A:FC:D6:48:2D", "%pMRU", addr);	test("2d-48-d6-fc-7a-05", "%pMF", addr);	test("2d48d6fc7a05", "%pm", addr);	test("2D48D6FC7A05", "%pmU", addr);	test("057afcd6482d", "%pmR", addr);} static voidip4(struct kunit *kunittest){	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 voidip6(struct kunit *kunittest){	const struct in6_addr addr = {		.s6_addr = { 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04,			     0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 }	};	const struct in6_addr single_zero = {		.s6_addr = { 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0x04,			     0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08 }	};	struct sockaddr_in6 sa = {		.sin6_family = AF_INET6,		.sin6_port = cpu_to_be16(12345),		.sin6_addr = addr,	}; 	test("00010002000300040005000600070008|0001:0002:0003:0004:0005:0006:0007:0008",	     "%pi6|%pI6", &addr, &addr);	test("00010002000300040005000600070008|0001:0002:0003:0004:0005:0006:0007:0008",	     "%piS|%pIS", &sa, &sa);	test("1:2:3:4:5:6:7:8", "%pI6c", &addr);	test("1:0:3:4:5:6:7:8", "%pI6c", &single_zero);	test("[1:2:3:4:5:6:7:8]:12345", "%pISpc", &sa);} static voiduuid(struct kunit *kunittest){	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] = {	{ .d_parent = &test_dentry[0],	  .d_name = QSTR_INIT(test_dentry[0].d_iname, 3),

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