/root/bitcoin/src/test/fuzz/strprintf.cpp

Source
// Copyright (c) 2020-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <tinyformat.h>
#include <util/strencodings.h>
#include <util/translation.h>

#include <algorithm>
#include <cstdint>
#include <string>
#include <vector>

template <typename... Args>
void fuzz_fmt(const std::string& fmt, const Args&... args)
{
    (void)tfm::format(tfm::RuntimeFormat{fmt}, args...);
}

FUZZ_TARGET(str_printf)
{
    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
    const std::string format_string = fuzzed_data_provider.ConsumeRandomLengthString(64);

    const int digits_in_format_specifier = std::count_if(format_string.begin(), format_string.end(), IsDigit);

    // Avoid triggering the following crash bug:
    // * strprintf("%987654321000000:", 1);
    //
    // Avoid triggering the following OOM bug:
    // * strprintf("%.222222200000000$", 1.1);
    //
    // Upstream bug report: https://github.com/c42f/tinyformat/issues/70
    if (format_string.find('%') != std::string::npos && digits_in_format_specifier >= 7) {
        return;
    }

    // Avoid triggering the following crash bug:
    // * strprintf("%1$*1$*", -11111111);
    //
    // Upstream bug report: https://github.com/c42f/tinyformat/issues/70
    if (format_string.find('%') != std::string::npos && format_string.find('$') != std::string::npos && format_string.find('*') != std::string::npos && digits_in_format_specifier > 0) {
        return;
    }

    // Avoid triggering the following crash bug:
    // * strprintf("%.1s", (char*)nullptr);
    //
    // (void)strprintf(format_string, (char*)nullptr);
    //
    // Upstream bug report: https://github.com/c42f/tinyformat/issues/70

    try {
        CallOneOf(
            fuzzed_data_provider,
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeRandomLengthString(32));
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeRandomLengthString(32).c_str());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<signed char>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<unsigned char>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<char>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeBool());
            });
    } catch (const tinyformat::format_error&) {
    }

    if (format_string.find('%') != std::string::npos && format_string.find('c') != std::string::npos) {
        // Avoid triggering the following:
        // * strprintf("%c", 1.31783e+38);
        // tinyformat.h:244:36: runtime error: 1.31783e+38 is outside the range of representable values of type 'char'
        return;
    }

    if (format_string.find('%') != std::string::npos && format_string.find('*') != std::string::npos) {
        // Avoid triggering the following:
        // * strprintf("%*", -2.33527e+38);
        // tinyformat.h:283:65: runtime error: -2.33527e+38 is outside the range of representable values of type 'int'
        // * strprintf("%*", -2147483648);
        // tinyformat.h:763:25: runtime error: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
        return;
    }

    try {
        CallOneOf(
            fuzzed_data_provider,
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeFloatingPoint<float>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeFloatingPoint<double>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<int16_t>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<uint16_t>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<int32_t>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<uint32_t>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<int64_t>());
            },
            [&] {
                fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<uint64_t>());
            });
    } catch (const tinyformat::format_error&) {
    }
}

Coverage Report

Created: 2025-09-19 18:22

Line	Count	Source
1		// Copyright (c) 2020-2021 The Bitcoin Core developers
2		// Distributed under the MIT software license, see the accompanying
3		// file COPYING or http://www.opensource.org/licenses/mit-license.php.
4
5		#include <test/fuzz/FuzzedDataProvider.h>
6		#include <test/fuzz/fuzz.h>
7		#include <test/fuzz/util.h>
8		#include <tinyformat.h>
9		#include <util/strencodings.h>
10		#include <util/translation.h>
11
12		#include <algorithm>
13		#include <cstdint>
14		#include <string>
15		#include <vector>
16
17		template <typename... Args>
18		void fuzz_fmt(const std::string& fmt, const Args&... args)
19	0	{
20	0	(void)tfm::format(tfm::RuntimeFormat{fmt}, args...);
21	0	} Unexecuted instantiation: _Z8fuzz_fmtIJNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEEvRKS5_DpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJPKcEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJaEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJhEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJcEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJbEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJfEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJdEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJsEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJtEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJiEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJjEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJlEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_ Unexecuted instantiation: _Z8fuzz_fmtIJmEEvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEDpRKT_
22
23		FUZZ_TARGET(str_printf)
24	0	{
25	0	FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
26	0	const std::string format_string = fuzzed_data_provider.ConsumeRandomLengthString(64);
27
28	0	const int digits_in_format_specifier = std::count_if(format_string.begin(), format_string.end(), IsDigit);
29
30		// Avoid triggering the following crash bug:
31		// * strprintf("%987654321000000:", 1);
32		//
33		// Avoid triggering the following OOM bug:
34		// * strprintf("%.222222200000000$", 1.1);
35		//
36		// Upstream bug report: https://github.com/c42f/tinyformat/issues/70
37	0	if (format_string.find('%') != std::string::npos && digits_in_format_specifier >= 7) {
38	0	return;
39	0	}
40
41		// Avoid triggering the following crash bug:
42		// * strprintf("%1$1$", -11111111);
43		//
44		// Upstream bug report: https://github.com/c42f/tinyformat/issues/70
45	0	if (format_string.find('%') != std::string::npos && format_string.find('$') != std::string::npos && format_string.find('*') != std::string::npos && digits_in_format_specifier > 0) {
46	0	return;
47	0	}
48
49		// Avoid triggering the following crash bug:
50		// * strprintf("%.1s", (char*)nullptr);
51		//
52		// (void)strprintf(format_string, (char*)nullptr);
53		//
54		// Upstream bug report: https://github.com/c42f/tinyformat/issues/70
55
56	0	try {
57	0	CallOneOf(
58	0	fuzzed_data_provider,
59	0	[&] {
60	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeRandomLengthString(32));
61	0	},
62	0	[&] {
63	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeRandomLengthString(32).c_str());
64	0	},
65	0	[&] {
66	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<signed char>());
67	0	},
68	0	[&] {
69	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<unsigned char>());
70	0	},
71	0	[&] {
72	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<char>());
73	0	},
74	0	[&] {
75	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeBool());
76	0	});
77	0	} catch (const tinyformat::format_error&) {
78	0	}
79
80	0	if (format_string.find('%') != std::string::npos && format_string.find('c') != std::string::npos) {
81		// Avoid triggering the following:
82		// * strprintf("%c", 1.31783e+38);
83		// tinyformat.h:244:36: runtime error: 1.31783e+38 is outside the range of representable values of type 'char'
84	0	return;
85	0	}
86
87	0	if (format_string.find('%') != std::string::npos && format_string.find('*') != std::string::npos) {
88		// Avoid triggering the following:
89		// * strprintf("%*", -2.33527e+38);
90		// tinyformat.h:283:65: runtime error: -2.33527e+38 is outside the range of representable values of type 'int'
91		// * strprintf("%*", -2147483648);
92		// tinyformat.h:763:25: runtime error: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
93	0	return;
94	0	}
95
96	0	try {
97	0	CallOneOf(
98	0	fuzzed_data_provider,
99	0	[&] {
100	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeFloatingPoint<float>());
101	0	},
102	0	[&] {
103	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeFloatingPoint<double>());
104	0	},
105	0	[&] {
106	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<int16_t>());
107	0	},
108	0	[&] {
109	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<uint16_t>());
110	0	},
111	0	[&] {
112	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<int32_t>());
113	0	},
114	0	[&] {
115	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<uint32_t>());
116	0	},
117	0	[&] {
118	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<int64_t>());
119	0	},
120	0	[&] {
121	0	fuzz_fmt(format_string, fuzzed_data_provider.ConsumeIntegral<uint64_t>());
122	0	});
123	0	} catch (const tinyformat::format_error&) {
124	0	}
125	0	}