From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- lib/tests/scanf_kunit.c | 815 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 815 insertions(+) create mode 100644 lib/tests/scanf_kunit.c (limited to 'lib/tests/scanf_kunit.c') diff --git a/lib/tests/scanf_kunit.c b/lib/tests/scanf_kunit.c new file mode 100644 index 000000000..e9a36ed80 --- /dev/null +++ b/lib/tests/scanf_kunit.c @@ -0,0 +1,815 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Test cases for sscanf facility. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define BUF_SIZE 1024 + +static char *test_buffer; +static char *fmt_buffer; +static struct rnd_state rnd_state; + +typedef void (*check_fn)(struct kunit *test, const char *file, const int line, + const void *check_data, const char *string, const char *fmt, int n_args, + va_list ap); + +static void __scanf(7, 9) +_test(struct kunit *test, const char *file, const int line, check_fn fn, const void *check_data, + const char *string, const char *fmt, int n_args, ...) +{ + va_list ap, ap_copy; + int ret; + + va_start(ap, n_args); + va_copy(ap_copy, ap); + ret = vsscanf(string, fmt, ap_copy); + va_end(ap_copy); + + if (ret != n_args) { + KUNIT_FAIL(test, "%s:%d: vsscanf(\"%s\", \"%s\", ...) returned %d expected %d", + file, line, string, fmt, ret, n_args); + } else { + (*fn)(test, file, line, check_data, string, fmt, n_args, ap); + } + + va_end(ap); +} + +#define _check_numbers_template(arg_fmt, expect, str, fmt, n_args, ap) \ +do { \ + for (; n_args > 0; n_args--, expect++) { \ + typeof(*expect) got = *va_arg(ap, typeof(expect)); \ + if (got != *expect) { \ + KUNIT_FAIL(test, \ + "%s:%d: vsscanf(\"%s\", \"%s\", ...) expected " arg_fmt " got " arg_fmt, \ + file, line, str, fmt, *expect, got); \ + return; \ + } \ + } \ +} while (0) + +static void check_ull(struct kunit *test, const char *file, const int line, const void *check_data, + const char *string, const char *fmt, int n_args, va_list ap) +{ + const unsigned long long *pval = check_data; + + _check_numbers_template("%llu", pval, string, fmt, n_args, ap); +} + +static void check_ll(struct kunit *test, const char *file, const int line, const void *check_data, + const char *string, const char *fmt, int n_args, va_list ap) +{ + const long long *pval = check_data; + + _check_numbers_template("%lld", pval, string, fmt, n_args, ap); +} + +static void check_ulong(struct kunit *test, const char *file, const int line, + const void *check_data, const char *string, const char *fmt, int n_args, + va_list ap) +{ + const unsigned long *pval = check_data; + + _check_numbers_template("%lu", pval, string, fmt, n_args, ap); +} + +static void check_long(struct kunit *test, const char *file, const int line, const void *check_data, + const char *string, const char *fmt, int n_args, va_list ap) +{ + const long *pval = check_data; + + _check_numbers_template("%ld", pval, string, fmt, n_args, ap); +} + +static void check_uint(struct kunit *test, const char *file, const int line, const void *check_data, + const char *string, const char *fmt, int n_args, va_list ap) +{ + const unsigned int *pval = check_data; + + _check_numbers_template("%u", pval, string, fmt, n_args, ap); +} + +static void check_int(struct kunit *test, const char *file, const int line, const void *check_data, + const char *string, const char *fmt, int n_args, va_list ap) +{ + const int *pval = check_data; + + _check_numbers_template("%d", pval, string, fmt, n_args, ap); +} + +static void check_ushort(struct kunit *test, const char *file, const int line, + const void *check_data, const char *string, const char *fmt, int n_args, + va_list ap) +{ + const unsigned short *pval = check_data; + + _check_numbers_template("%hu", pval, string, fmt, n_args, ap); +} + +static void check_short(struct kunit *test, const char *file, const int line, + const void *check_data, const char *string, const char *fmt, int n_args, + va_list ap) +{ + const short *pval = check_data; + + _check_numbers_template("%hd", pval, string, fmt, n_args, ap); +} + +static void check_uchar(struct kunit *test, const char *file, const int line, + const void *check_data, const char *string, const char *fmt, int n_args, + va_list ap) +{ + const unsigned char *pval = check_data; + + _check_numbers_template("%hhu", pval, string, fmt, n_args, ap); +} + +static void check_char(struct kunit *test, const char *file, const int line, const void *check_data, + const char *string, const char *fmt, int n_args, va_list ap) +{ + const signed char *pval = check_data; + + _check_numbers_template("%hhd", pval, string, fmt, n_args, ap); +} + +/* Selection of interesting numbers to test, copied from test-kstrtox.c */ +static const unsigned long long numbers[] = { + 0x0ULL, + 0x1ULL, + 0x7fULL, + 0x80ULL, + 0x81ULL, + 0xffULL, + 0x100ULL, + 0x101ULL, + 0x7fffULL, + 0x8000ULL, + 0x8001ULL, + 0xffffULL, + 0x10000ULL, + 0x10001ULL, + 0x7fffffffULL, + 0x80000000ULL, + 0x80000001ULL, + 0xffffffffULL, + 0x100000000ULL, + 0x100000001ULL, + 0x7fffffffffffffffULL, + 0x8000000000000000ULL, + 0x8000000000000001ULL, + 0xfffffffffffffffeULL, + 0xffffffffffffffffULL, +}; + +#define value_representable_in_type(T, val) \ +(is_signed_type(T) \ + ? ((long long)(val) >= type_min(T)) && ((long long)(val) <= type_max(T)) \ + : ((unsigned long long)(val) <= type_max(T))) + + +#define test_one_number(T, gen_fmt, scan_fmt, val, fn) \ +do { \ + const T expect_val = (T)(val); \ + T result = ~expect_val; /* should be overwritten */ \ + \ + snprintf(test_buffer, BUF_SIZE, gen_fmt, expect_val); \ + _test(test, __FILE__, __LINE__, fn, &expect_val, test_buffer, "%" scan_fmt, 1, &result);\ +} while (0) + +#define simple_numbers_loop(T, gen_fmt, scan_fmt, fn) \ +do { \ + int i; \ + \ + for (i = 0; i < ARRAY_SIZE(numbers); i++) { \ + if (value_representable_in_type(T, numbers[i])) \ + test_one_number(T, gen_fmt, scan_fmt, \ + numbers[i], fn); \ + \ + if (value_representable_in_type(T, -numbers[i])) \ + test_one_number(T, gen_fmt, scan_fmt, \ + -numbers[i], fn); \ + } \ +} while (0) + +static void numbers_simple(struct kunit *test) +{ + simple_numbers_loop(unsigned long long, "%llu", "llu", check_ull); + simple_numbers_loop(long long, "%lld", "lld", check_ll); + simple_numbers_loop(long long, "%lld", "lli", check_ll); + simple_numbers_loop(unsigned long long, "%llx", "llx", check_ull); + simple_numbers_loop(long long, "%llx", "llx", check_ll); + simple_numbers_loop(long long, "0x%llx", "lli", check_ll); + simple_numbers_loop(unsigned long long, "0x%llx", "llx", check_ull); + simple_numbers_loop(long long, "0x%llx", "llx", check_ll); + + simple_numbers_loop(unsigned long, "%lu", "lu", check_ulong); + simple_numbers_loop(long, "%ld", "ld", check_long); + simple_numbers_loop(long, "%ld", "li", check_long); + simple_numbers_loop(unsigned long, "%lx", "lx", check_ulong); + simple_numbers_loop(long, "%lx", "lx", check_long); + simple_numbers_loop(long, "0x%lx", "li", check_long); + simple_numbers_loop(unsigned long, "0x%lx", "lx", check_ulong); + simple_numbers_loop(long, "0x%lx", "lx", check_long); + + simple_numbers_loop(unsigned int, "%u", "u", check_uint); + simple_numbers_loop(int, "%d", "d", check_int); + simple_numbers_loop(int, "%d", "i", check_int); + simple_numbers_loop(unsigned int, "%x", "x", check_uint); + simple_numbers_loop(int, "%x", "x", check_int); + simple_numbers_loop(int, "0x%x", "i", check_int); + simple_numbers_loop(unsigned int, "0x%x", "x", check_uint); + simple_numbers_loop(int, "0x%x", "x", check_int); + + simple_numbers_loop(unsigned short, "%hu", "hu", check_ushort); + simple_numbers_loop(short, "%hd", "hd", check_short); + simple_numbers_loop(short, "%hd", "hi", check_short); + simple_numbers_loop(unsigned short, "%hx", "hx", check_ushort); + simple_numbers_loop(short, "%hx", "hx", check_short); + simple_numbers_loop(short, "0x%hx", "hi", check_short); + simple_numbers_loop(unsigned short, "0x%hx", "hx", check_ushort); + simple_numbers_loop(short, "0x%hx", "hx", check_short); + + simple_numbers_loop(unsigned char, "%hhu", "hhu", check_uchar); + simple_numbers_loop(signed char, "%hhd", "hhd", check_char); + simple_numbers_loop(signed char, "%hhd", "hhi", check_char); + simple_numbers_loop(unsigned char, "%hhx", "hhx", check_uchar); + simple_numbers_loop(signed char, "%hhx", "hhx", check_char); + simple_numbers_loop(signed char, "0x%hhx", "hhi", check_char); + simple_numbers_loop(unsigned char, "0x%hhx", "hhx", check_uchar); + simple_numbers_loop(signed char, "0x%hhx", "hhx", check_char); +} + +/* + * This gives a better variety of number "lengths" in a small sample than + * the raw prandom*() functions (Not mathematically rigorous!!). + * Variabilty of length and value is more important than perfect randomness. + */ +static u32 next_test_random(u32 max_bits) +{ + u32 n_bits = hweight32(prandom_u32_state(&rnd_state)) % (max_bits + 1); + + return prandom_u32_state(&rnd_state) & GENMASK(n_bits, 0); +} + +static unsigned long long next_test_random_ull(void) +{ + u32 rand1 = prandom_u32_state(&rnd_state); + u32 n_bits = (hweight32(rand1) * 3) % 64; + u64 val = (u64)prandom_u32_state(&rnd_state) * rand1; + + return val & GENMASK_ULL(n_bits, 0); +} + +#define random_for_type(T) \ + ((T)(sizeof(T) <= sizeof(u32) \ + ? next_test_random(BITS_PER_TYPE(T)) \ + : next_test_random_ull())) + +/* + * Define a pattern of negative and positive numbers to ensure we get + * some of both within the small number of samples in a test string. + */ +#define NEGATIVES_PATTERN 0x3246 /* 00110010 01000110 */ + +#define fill_random_array(arr) \ +do { \ + unsigned int neg_pattern = NEGATIVES_PATTERN; \ + int i; \ + \ + for (i = 0; i < ARRAY_SIZE(arr); i++, neg_pattern >>= 1) { \ + (arr)[i] = random_for_type(typeof((arr)[0])); \ + if (is_signed_type(typeof((arr)[0])) && (neg_pattern & 1)) \ + (arr)[i] = -(arr)[i]; \ + } \ +} while (0) + +/* + * Convenience wrapper around snprintf() to append at buf_pos in buf, + * updating buf_pos and returning the number of characters appended. + * On error buf_pos is not changed and return value is 0. + */ +static int __printf(4, 5) +append_fmt(char *buf, int *buf_pos, int buf_len, const char *val_fmt, ...) +{ + va_list ap; + int field_len; + + va_start(ap, val_fmt); + field_len = vsnprintf(buf + *buf_pos, buf_len - *buf_pos, val_fmt, ap); + va_end(ap); + + if (field_len < 0) + field_len = 0; + + *buf_pos += field_len; + + return field_len; +} + +/* + * Convenience function to append the field delimiter string + * to both the value string and format string buffers. + */ +static void append_delim(char *str_buf, int *str_buf_pos, int str_buf_len, + char *fmt_buf, int *fmt_buf_pos, int fmt_buf_len, + const char *delim_str) +{ + append_fmt(str_buf, str_buf_pos, str_buf_len, delim_str); + append_fmt(fmt_buf, fmt_buf_pos, fmt_buf_len, delim_str); +} + +#define test_array_8(fn, check_data, string, fmt, arr) \ +do { \ + BUILD_BUG_ON(ARRAY_SIZE(arr) != 8); \ + _test(test, __FILE__, __LINE__, fn, check_data, string, fmt, 8, \ + &(arr)[0], &(arr)[1], &(arr)[2], &(arr)[3], \ + &(arr)[4], &(arr)[5], &(arr)[6], &(arr)[7]); \ +} while (0) + +#define numbers_list_8(T, gen_fmt, field_sep, scan_fmt, fn) \ +do { \ + int i, pos = 0, fmt_pos = 0; \ + T expect[8], result[8]; \ + \ + fill_random_array(expect); \ + \ + for (i = 0; i < ARRAY_SIZE(expect); i++) { \ + if (i != 0) \ + append_delim(test_buffer, &pos, BUF_SIZE, \ + fmt_buffer, &fmt_pos, BUF_SIZE, \ + field_sep); \ + \ + append_fmt(test_buffer, &pos, BUF_SIZE, gen_fmt, expect[i]); \ + append_fmt(fmt_buffer, &fmt_pos, BUF_SIZE, "%%%s", scan_fmt); \ + } \ + \ + test_array_8(fn, expect, test_buffer, fmt_buffer, result); \ +} while (0) + +#define numbers_list_fix_width(T, gen_fmt, field_sep, width, scan_fmt, fn) \ +do { \ + char full_fmt[16]; \ + \ + snprintf(full_fmt, sizeof(full_fmt), "%u%s", width, scan_fmt); \ + numbers_list_8(T, gen_fmt, field_sep, full_fmt, fn); \ +} while (0) + +#define numbers_list_val_width(T, gen_fmt, field_sep, scan_fmt, fn) \ +do { \ + int i, val_len, pos = 0, fmt_pos = 0; \ + T expect[8], result[8]; \ + \ + fill_random_array(expect); \ + \ + for (i = 0; i < ARRAY_SIZE(expect); i++) { \ + if (i != 0) \ + append_delim(test_buffer, &pos, BUF_SIZE, \ + fmt_buffer, &fmt_pos, BUF_SIZE, field_sep);\ + \ + val_len = append_fmt(test_buffer, &pos, BUF_SIZE, gen_fmt, \ + expect[i]); \ + append_fmt(fmt_buffer, &fmt_pos, BUF_SIZE, \ + "%%%u%s", val_len, scan_fmt); \ + } \ + \ + test_array_8(fn, expect, test_buffer, fmt_buffer, result); \ +} while (0) + +static void numbers_list_ll(struct kunit *test, const char *delim) +{ + numbers_list_8(unsigned long long, "%llu", delim, "llu", check_ull); + numbers_list_8(long long, "%lld", delim, "lld", check_ll); + numbers_list_8(long long, "%lld", delim, "lli", check_ll); + numbers_list_8(unsigned long long, "%llx", delim, "llx", check_ull); + numbers_list_8(unsigned long long, "0x%llx", delim, "llx", check_ull); + numbers_list_8(long long, "0x%llx", delim, "lli", check_ll); +} + +static void numbers_list_l(struct kunit *test, const char *delim) +{ + numbers_list_8(unsigned long, "%lu", delim, "lu", check_ulong); + numbers_list_8(long, "%ld", delim, "ld", check_long); + numbers_list_8(long, "%ld", delim, "li", check_long); + numbers_list_8(unsigned long, "%lx", delim, "lx", check_ulong); + numbers_list_8(unsigned long, "0x%lx", delim, "lx", check_ulong); + numbers_list_8(long, "0x%lx", delim, "li", check_long); +} + +static void numbers_list_d(struct kunit *test, const char *delim) +{ + numbers_list_8(unsigned int, "%u", delim, "u", check_uint); + numbers_list_8(int, "%d", delim, "d", check_int); + numbers_list_8(int, "%d", delim, "i", check_int); + numbers_list_8(unsigned int, "%x", delim, "x", check_uint); + numbers_list_8(unsigned int, "0x%x", delim, "x", check_uint); + numbers_list_8(int, "0x%x", delim, "i", check_int); +} + +static void numbers_list_h(struct kunit *test, const char *delim) +{ + numbers_list_8(unsigned short, "%hu", delim, "hu", check_ushort); + numbers_list_8(short, "%hd", delim, "hd", check_short); + numbers_list_8(short, "%hd", delim, "hi", check_short); + numbers_list_8(unsigned short, "%hx", delim, "hx", check_ushort); + numbers_list_8(unsigned short, "0x%hx", delim, "hx", check_ushort); + numbers_list_8(short, "0x%hx", delim, "hi", check_short); +} + +static void numbers_list_hh(struct kunit *test, const char *delim) +{ + numbers_list_8(unsigned char, "%hhu", delim, "hhu", check_uchar); + numbers_list_8(signed char, "%hhd", delim, "hhd", check_char); + numbers_list_8(signed char, "%hhd", delim, "hhi", check_char); + numbers_list_8(unsigned char, "%hhx", delim, "hhx", check_uchar); + numbers_list_8(unsigned char, "0x%hhx", delim, "hhx", check_uchar); + numbers_list_8(signed char, "0x%hhx", delim, "hhi", check_char); +} + +static void numbers_list(struct kunit *test) +{ + const char * const *param = test->param_value; + const char *delim = *param; + + numbers_list_ll(test, delim); + numbers_list_l(test, delim); + numbers_list_d(test, delim); + numbers_list_h(test, delim); + numbers_list_hh(test, delim); +} + +static void numbers_list_field_width_ll(struct kunit *test, const char *delim) +{ + numbers_list_fix_width(unsigned long long, "%llu", delim, 20, "llu", check_ull); + numbers_list_fix_width(long long, "%lld", delim, 20, "lld", check_ll); + numbers_list_fix_width(long long, "%lld", delim, 20, "lli", check_ll); + numbers_list_fix_width(unsigned long long, "%llx", delim, 16, "llx", check_ull); + numbers_list_fix_width(unsigned long long, "0x%llx", delim, 18, "llx", check_ull); + numbers_list_fix_width(long long, "0x%llx", delim, 18, "lli", check_ll); +} + +static void numbers_list_field_width_l(struct kunit *test, const char *delim) +{ +#if BITS_PER_LONG == 64 + numbers_list_fix_width(unsigned long, "%lu", delim, 20, "lu", check_ulong); + numbers_list_fix_width(long, "%ld", delim, 20, "ld", check_long); + numbers_list_fix_width(long, "%ld", delim, 20, "li", check_long); + numbers_list_fix_width(unsigned long, "%lx", delim, 16, "lx", check_ulong); + numbers_list_fix_width(unsigned long, "0x%lx", delim, 18, "lx", check_ulong); + numbers_list_fix_width(long, "0x%lx", delim, 18, "li", check_long); +#else + numbers_list_fix_width(unsigned long, "%lu", delim, 10, "lu", check_ulong); + numbers_list_fix_width(long, "%ld", delim, 11, "ld", check_long); + numbers_list_fix_width(long, "%ld", delim, 11, "li", check_long); + numbers_list_fix_width(unsigned long, "%lx", delim, 8, "lx", check_ulong); + numbers_list_fix_width(unsigned long, "0x%lx", delim, 10, "lx", check_ulong); + numbers_list_fix_width(long, "0x%lx", delim, 10, "li", check_long); +#endif +} + +static void numbers_list_field_width_d(struct kunit *test, const char *delim) +{ + numbers_list_fix_width(unsigned int, "%u", delim, 10, "u", check_uint); + numbers_list_fix_width(int, "%d", delim, 11, "d", check_int); + numbers_list_fix_width(int, "%d", delim, 11, "i", check_int); + numbers_list_fix_width(unsigned int, "%x", delim, 8, "x", check_uint); + numbers_list_fix_width(unsigned int, "0x%x", delim, 10, "x", check_uint); + numbers_list_fix_width(int, "0x%x", delim, 10, "i", check_int); +} + +static void numbers_list_field_width_h(struct kunit *test, const char *delim) +{ + numbers_list_fix_width(unsigned short, "%hu", delim, 5, "hu", check_ushort); + numbers_list_fix_width(short, "%hd", delim, 6, "hd", check_short); + numbers_list_fix_width(short, "%hd", delim, 6, "hi", check_short); + numbers_list_fix_width(unsigned short, "%hx", delim, 4, "hx", check_ushort); + numbers_list_fix_width(unsigned short, "0x%hx", delim, 6, "hx", check_ushort); + numbers_list_fix_width(short, "0x%hx", delim, 6, "hi", check_short); +} + +static void numbers_list_field_width_hh(struct kunit *test, const char *delim) +{ + numbers_list_fix_width(unsigned char, "%hhu", delim, 3, "hhu", check_uchar); + numbers_list_fix_width(signed char, "%hhd", delim, 4, "hhd", check_char); + numbers_list_fix_width(signed char, "%hhd", delim, 4, "hhi", check_char); + numbers_list_fix_width(unsigned char, "%hhx", delim, 2, "hhx", check_uchar); + numbers_list_fix_width(unsigned char, "0x%hhx", delim, 4, "hhx", check_uchar); + numbers_list_fix_width(signed char, "0x%hhx", delim, 4, "hhi", check_char); +} + +/* + * List of numbers separated by delim. Each field width specifier is the + * maximum possible digits for the given type and base. + */ +static void numbers_list_field_width_typemax(struct kunit *test) +{ + const char * const *param = test->param_value; + const char *delim = *param; + + numbers_list_field_width_ll(test, delim); + numbers_list_field_width_l(test, delim); + numbers_list_field_width_d(test, delim); + numbers_list_field_width_h(test, delim); + numbers_list_field_width_hh(test, delim); +} + +static void numbers_list_field_width_val_ll(struct kunit *test, const char *delim) +{ + numbers_list_val_width(unsigned long long, "%llu", delim, "llu", check_ull); + numbers_list_val_width(long long, "%lld", delim, "lld", check_ll); + numbers_list_val_width(long long, "%lld", delim, "lli", check_ll); + numbers_list_val_width(unsigned long long, "%llx", delim, "llx", check_ull); + numbers_list_val_width(unsigned long long, "0x%llx", delim, "llx", check_ull); + numbers_list_val_width(long long, "0x%llx", delim, "lli", check_ll); +} + +static void numbers_list_field_width_val_l(struct kunit *test, const char *delim) +{ + numbers_list_val_width(unsigned long, "%lu", delim, "lu", check_ulong); + numbers_list_val_width(long, "%ld", delim, "ld", check_long); + numbers_list_val_width(long, "%ld", delim, "li", check_long); + numbers_list_val_width(unsigned long, "%lx", delim, "lx", check_ulong); + numbers_list_val_width(unsigned long, "0x%lx", delim, "lx", check_ulong); + numbers_list_val_width(long, "0x%lx", delim, "li", check_long); +} + +static void numbers_list_field_width_val_d(struct kunit *test, const char *delim) +{ + numbers_list_val_width(unsigned int, "%u", delim, "u", check_uint); + numbers_list_val_width(int, "%d", delim, "d", check_int); + numbers_list_val_width(int, "%d", delim, "i", check_int); + numbers_list_val_width(unsigned int, "%x", delim, "x", check_uint); + numbers_list_val_width(unsigned int, "0x%x", delim, "x", check_uint); + numbers_list_val_width(int, "0x%x", delim, "i", check_int); +} + +static void numbers_list_field_width_val_h(struct kunit *test, const char *delim) +{ + numbers_list_val_width(unsigned short, "%hu", delim, "hu", check_ushort); + numbers_list_val_width(short, "%hd", delim, "hd", check_short); + numbers_list_val_width(short, "%hd", delim, "hi", check_short); + numbers_list_val_width(unsigned short, "%hx", delim, "hx", check_ushort); + numbers_list_val_width(unsigned short, "0x%hx", delim, "hx", check_ushort); + numbers_list_val_width(short, "0x%hx", delim, "hi", check_short); +} + +static void numbers_list_field_width_val_hh(struct kunit *test, const char *delim) +{ + numbers_list_val_width(unsigned char, "%hhu", delim, "hhu", check_uchar); + numbers_list_val_width(signed char, "%hhd", delim, "hhd", check_char); + numbers_list_val_width(signed char, "%hhd", delim, "hhi", check_char); + numbers_list_val_width(unsigned char, "%hhx", delim, "hhx", check_uchar); + numbers_list_val_width(unsigned char, "0x%hhx", delim, "hhx", check_uchar); + numbers_list_val_width(signed char, "0x%hhx", delim, "hhi", check_char); +} + +/* + * List of numbers separated by delim. Each field width specifier is the + * exact length of the corresponding value digits in the string being scanned. + */ +static void numbers_list_field_width_val_width(struct kunit *test) +{ + const char * const *param = test->param_value; + const char *delim = *param; + + numbers_list_field_width_val_ll(test, delim); + numbers_list_field_width_val_l(test, delim); + numbers_list_field_width_val_d(test, delim); + numbers_list_field_width_val_h(test, delim); + numbers_list_field_width_val_hh(test, delim); +} + +/* + * Slice a continuous string of digits without field delimiters, containing + * numbers of varying length, using the field width to extract each group + * of digits. For example the hex values c0,3,bf01,303 would have a + * string representation of "c03bf01303" and extracted with "%2x%1x%4x%3x". + */ +static void numbers_slice(struct kunit *test) +{ + const char *delim = ""; + + KUNIT_ASSERT_PTR_EQ(test, test->param_value, NULL); + test->param_value = &delim; + + numbers_list_field_width_val_width(test); +} + +#define test_number_prefix(T, str, scan_fmt, expect0, expect1, n_args, fn) \ +do { \ + const T expect[2] = { expect0, expect1 }; \ + T result[2] = { (T)~expect[0], (T)~expect[1] }; \ + \ + _test(test, __FILE__, __LINE__, fn, &expect, str, scan_fmt, n_args, &result[0], &result[1]);\ +} while (0) + +/* + * Number prefix is >= field width. + * Expected behaviour is derived from testing userland sscanf. + */ +static void numbers_prefix_overflow(struct kunit *test) +{ + /* + * Negative decimal with a field of width 1, should quit scanning + * and return 0. + */ + test_number_prefix(long long, "-1 1", "%1lld %lld", 0, 0, 0, check_ll); + test_number_prefix(long, "-1 1", "%1ld %ld", 0, 0, 0, check_long); + test_number_prefix(int, "-1 1", "%1d %d", 0, 0, 0, check_int); + test_number_prefix(short, "-1 1", "%1hd %hd", 0, 0, 0, check_short); + test_number_prefix(signed char, "-1 1", "%1hhd %hhd", 0, 0, 0, check_char); + + test_number_prefix(long long, "-1 1", "%1lli %lli", 0, 0, 0, check_ll); + test_number_prefix(long, "-1 1", "%1li %li", 0, 0, 0, check_long); + test_number_prefix(int, "-1 1", "%1i %i", 0, 0, 0, check_int); + test_number_prefix(short, "-1 1", "%1hi %hi", 0, 0, 0, check_short); + test_number_prefix(signed char, "-1 1", "%1hhi %hhi", 0, 0, 0, check_char); + + /* + * 0x prefix in a field of width 1: 0 is a valid digit so should + * convert. Next field scan starts at the 'x' which isn't a digit so + * scan quits with one field converted. + */ + test_number_prefix(unsigned long long, "0xA7", "%1llx%llx", 0, 0, 1, check_ull); + test_number_prefix(unsigned long, "0xA7", "%1lx%lx", 0, 0, 1, check_ulong); + test_number_prefix(unsigned int, "0xA7", "%1x%x", 0, 0, 1, check_uint); + test_number_prefix(unsigned short, "0xA7", "%1hx%hx", 0, 0, 1, check_ushort); + test_number_prefix(unsigned char, "0xA7", "%1hhx%hhx", 0, 0, 1, check_uchar); + test_number_prefix(long long, "0xA7", "%1lli%llx", 0, 0, 1, check_ll); + test_number_prefix(long, "0xA7", "%1li%lx", 0, 0, 1, check_long); + test_number_prefix(int, "0xA7", "%1i%x", 0, 0, 1, check_int); + test_number_prefix(short, "0xA7", "%1hi%hx", 0, 0, 1, check_short); + test_number_prefix(char, "0xA7", "%1hhi%hhx", 0, 0, 1, check_char); + + /* + * 0x prefix in a field of width 2 using %x conversion: first field + * converts to 0. Next field scan starts at the character after "0x". + * Both fields will convert. + */ + test_number_prefix(unsigned long long, "0xA7", "%2llx%llx", 0, 0xa7, 2, check_ull); + test_number_prefix(unsigned long, "0xA7", "%2lx%lx", 0, 0xa7, 2, check_ulong); + test_number_prefix(unsigned int, "0xA7", "%2x%x", 0, 0xa7, 2, check_uint); + test_number_prefix(unsigned short, "0xA7", "%2hx%hx", 0, 0xa7, 2, check_ushort); + test_number_prefix(unsigned char, "0xA7", "%2hhx%hhx", 0, 0xa7, 2, check_uchar); + + /* + * 0x prefix in a field of width 2 using %i conversion: first field + * converts to 0. Next field scan starts at the character after "0x", + * which will convert if can be interpreted as decimal but will fail + * if it contains any hex digits (since no 0x prefix). + */ + test_number_prefix(long long, "0x67", "%2lli%lli", 0, 67, 2, check_ll); + test_number_prefix(long, "0x67", "%2li%li", 0, 67, 2, check_long); + test_number_prefix(int, "0x67", "%2i%i", 0, 67, 2, check_int); + test_number_prefix(short, "0x67", "%2hi%hi", 0, 67, 2, check_short); + test_number_prefix(char, "0x67", "%2hhi%hhi", 0, 67, 2, check_char); + + test_number_prefix(long long, "0xA7", "%2lli%lli", 0, 0, 1, check_ll); + test_number_prefix(long, "0xA7", "%2li%li", 0, 0, 1, check_long); + test_number_prefix(int, "0xA7", "%2i%i", 0, 0, 1, check_int); + test_number_prefix(short, "0xA7", "%2hi%hi", 0, 0, 1, check_short); + test_number_prefix(char, "0xA7", "%2hhi%hhi", 0, 0, 1, check_char); +} + +#define _test_simple_strtoxx(T, fn, gen_fmt, expect, base) \ +do { \ + T got; \ + char *endp; \ + int len; \ + \ + len = snprintf(test_buffer, BUF_SIZE, gen_fmt, expect); \ + got = (fn)(test_buffer, &endp, base); \ + if (got != (expect)) { \ + KUNIT_FAIL(test, #fn "(\"%s\", %d): got " gen_fmt " expected " gen_fmt, \ + test_buffer, base, got, expect); \ + } else if (endp != test_buffer + len) { \ + KUNIT_FAIL(test, #fn "(\"%s\", %d) startp=0x%px got endp=0x%px expected 0x%px", \ + test_buffer, base, test_buffer, \ + test_buffer + len, endp); \ + } \ +} while (0) + +#define test_simple_strtoxx(T, fn, gen_fmt, base) \ +do { \ + int i; \ + \ + for (i = 0; i < ARRAY_SIZE(numbers); i++) { \ + _test_simple_strtoxx(T, fn, gen_fmt, (T)numbers[i], base); \ + \ + if (is_signed_type(T)) \ + _test_simple_strtoxx(T, fn, gen_fmt, \ + -(T)numbers[i], base); \ + } \ +} while (0) + +static void test_simple_strtoull(struct kunit *test) +{ + test_simple_strtoxx(unsigned long long, simple_strtoull, "%llu", 10); + test_simple_strtoxx(unsigned long long, simple_strtoull, "%llu", 0); + test_simple_strtoxx(unsigned long long, simple_strtoull, "%llx", 16); + test_simple_strtoxx(unsigned long long, simple_strtoull, "0x%llx", 16); + test_simple_strtoxx(unsigned long long, simple_strtoull, "0x%llx", 0); +} + +static void test_simple_strtoll(struct kunit *test) +{ + test_simple_strtoxx(long long, simple_strtoll, "%lld", 10); + test_simple_strtoxx(long long, simple_strtoll, "%lld", 0); + test_simple_strtoxx(long long, simple_strtoll, "%llx", 16); + test_simple_strtoxx(long long, simple_strtoll, "0x%llx", 16); + test_simple_strtoxx(long long, simple_strtoll, "0x%llx", 0); +} + +static void test_simple_strtoul(struct kunit *test) +{ + test_simple_strtoxx(unsigned long, simple_strtoul, "%lu", 10); + test_simple_strtoxx(unsigned long, simple_strtoul, "%lu", 0); + test_simple_strtoxx(unsigned long, simple_strtoul, "%lx", 16); + test_simple_strtoxx(unsigned long, simple_strtoul, "0x%lx", 16); + test_simple_strtoxx(unsigned long, simple_strtoul, "0x%lx", 0); +} + +static void test_simple_strtol(struct kunit *test) +{ + test_simple_strtoxx(long, simple_strtol, "%ld", 10); + test_simple_strtoxx(long, simple_strtol, "%ld", 0); + test_simple_strtoxx(long, simple_strtol, "%lx", 16); + test_simple_strtoxx(long, simple_strtol, "0x%lx", 16); + test_simple_strtoxx(long, simple_strtol, "0x%lx", 0); +} + +/* Selection of common delimiters/separators between numbers in a string. */ +static const char * const number_delimiters[] = { + " ", ":", ",", "-", "/", +}; + +static void number_delimiter_param_desc(const char * const *param, + char *desc) +{ + snprintf(desc, KUNIT_PARAM_DESC_SIZE, "\"%s\"", *param); +} + +KUNIT_ARRAY_PARAM(number_delimiters, number_delimiters, number_delimiter_param_desc); + +static struct kunit_case scanf_test_cases[] = { + KUNIT_CASE(numbers_simple), + /* String with multiple numbers separated by delimiter. */ + KUNIT_CASE_PARAM(numbers_list, number_delimiters_gen_params), + /* Field width may be longer than actual field digits. */ + KUNIT_CASE_PARAM(numbers_list_field_width_typemax, number_delimiters_gen_params), + /* Each field width exactly length of actual field digits. */ + KUNIT_CASE_PARAM(numbers_list_field_width_val_width, number_delimiters_gen_params), + /* Slice continuous sequence of digits using field widths. */ + KUNIT_CASE(numbers_slice), + KUNIT_CASE(numbers_prefix_overflow), + + KUNIT_CASE(test_simple_strtoull), + KUNIT_CASE(test_simple_strtoll), + KUNIT_CASE(test_simple_strtoul), + KUNIT_CASE(test_simple_strtol), + {} +}; + +static int scanf_suite_init(struct kunit_suite *suite) +{ + test_buffer = kmalloc(BUF_SIZE, GFP_KERNEL); + if (!test_buffer) + return -ENOMEM; + + fmt_buffer = kmalloc(BUF_SIZE, GFP_KERNEL); + if (!fmt_buffer) { + kfree(test_buffer); + return -ENOMEM; + } + + prandom_seed_state(&rnd_state, 3141592653589793238ULL); + + return 0; +} + +static void scanf_suite_exit(struct kunit_suite *suite) +{ + kfree(fmt_buffer); + kfree(test_buffer); +} + +static struct kunit_suite scanf_test_suite = { + .name = "scanf", + .suite_init = scanf_suite_init, + .suite_exit = scanf_suite_exit, + .test_cases = scanf_test_cases, +}; + +kunit_test_suite(scanf_test_suite); + +MODULE_AUTHOR("Richard Fitzgerald "); +MODULE_DESCRIPTION("Test cases for sscanf facility"); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1