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Comment: minor cleanup

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Note that C23, section 7.16.1.1, paragraph 2 indicates that it is safe to specify a signed integer conversion specifier with an unsigned integer argument, or an unsigned specifier with a signed argument, as long as both types are compatible , and the integer value is representable in both types.  In contrast, the %n specifier requires a pointer to signed int, it is undefined behavior to pass it . Passing the %n specifier an unsigned int or any other type of integer is undefined behavior.

Format strings are usually string literals specified at the call site, but they need not be. However, they should not contain tainted values. (See FIO30-C. Exclude user input from format strings for more information.)

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Rule

Severity

Likelihood

Detectable

Repairable

Priority

Level

FIO47-C

High

Unlikely

Yes

No

P6

L2

Automated Detection

Tool

Version

Checker

Description

Astrée
Include Page
Astrée_V
Astrée_V
format-string-excessive-arguments
format-string-mismatched-arguments
invalid-format-string		Partially checked
Axivion Bauhaus Suite

Include Page
Axivion Bauhaus Suite_V
Axivion Bauhaus Suite_V

CertC-FIO47Fully implemented
CodeSonar
Include Page
CodeSonar_V
CodeSonar_V

IO.INJ.FMT
MISC.FMT
MISC.FMTTYPE

Format string injection
Format string
Format string type error

Coverity
Include Page
Coverity_V
Coverity_V
PWReports when the number of arguments differs from the number of required arguments according to the format string
Cppcheck

 

Include Page
Cppcheck_V
Cppcheck_V

invalidscanf
wrongPrintfScanfArgNum
invalidLengthModifierError
invalidScanfFormatWidth
wrongPrintfScanfParameterPositionError
Cppcheck Premium

Include Page
Cppcheck Premium_V
Cppcheck Premium_V

invalidscanf
wrongPrintfScanfArgNum
invalidLengthModifierError
invalidScanfFormatWidth
wrongPrintfScanfParameterPositionError
GCC
Include Page
GCC_V
GCC_V


Can detect violations of this recommendation when the -Wformat flag is used

Helix QAC

Include Page
Helix QAC_V
Helix QAC_V

C0161, C0162, C0163, C0164, C0165, C0166, C0167, C0168, C0169, C0170, C0171, C0172, C0173, C0174, C0175, C0176, C0177, C0178, C0179, C0180, C0184, C0185, C0190, C0191, C0192, C0193, C0194, C0195, C0196, C0197, C0198, C0199, C0200, C0201, C0202, C0204, C0206, C0209

C++3150, C++3151, C++3152, C++3153, C++3154, C++3155, C++3156, C++3157, C++3158, C++3159


Klocwork
Include Page
Klocwork_V
Klocwork_V

SV.FMT_STR.PRINT_FORMAT_MISMATCH.BAD
SV.FMT_STR.PRINT_FORMAT_MISMATCH.UNDESIRED
SV.FMT_STR.PRINT_IMPROP_LENGTH
SV.FMT_STR.PRINT_PARAMS_WRONGNUM.FEW
SV.FMT_STR.PRINT_PARAMS_WRONGNUM.MANY
SV.FMT_STR.SCAN_FORMAT_MISMATCH.BAD
SV.FMT_STR.SCAN_FORMAT_MISMATCH.UNDESIRED
SV.FMT_STR.SCAN_IMPROP_LENGTH
SV.FMT_STR.SCAN_PARAMS_WRONGNUM.FEW
SV.FMT_STR.SCAN_PARAMS_WRONGNUM.MANY
SV.FMT_STR.UNKWN_FORMAT


LDRA tool suite
Include Page
LDRA_V
LDRA_V

486 S
589 S

Fully implemented

Parasoft C/C++test
Include Page
Parasoft_V
Parasoft_V

CERT_C-FIO47-a
CERT_C-FIO47-b
CERT_C-FIO47-c
CERT_C-FIO47-d
CERT_C-FIO47-e
CERT_C-FIO47-f

There should be no mismatch between the '%s' and '%c' format specifiers in the format string and their corresponding arguments in the invocation of a string formatting function
There should be no mismatch between the '%f' format specifier in the format string and its corresponding argument in the invocation of a string formatting function
There should be no mismatch between the '%i' and '%d' format specifiers in the string and their corresponding arguments in the invocation of a string formatting function
There should be no mismatch between the '%u' format specifier in the format string and its corresponding argument in the invocation of a string formatting function
There should be no mismatch between the '%p' format specifier in the format string and its corresponding argument in the invocation of a string formatting function
The number of format specifiers in the format string and the number of corresponding arguments in the invocation of a string formatting function should be equal

PC-lint Plus

Include Page
PC-lint Plus_V
PC-lint Plus_V

492, 493, 494, 499, 557,
558, 559, 566, 705, 706,
719, 816, 855, 2401, 2402,
2403, 2404, 2405, 2406, 2407

Fully supported

Polyspace Bug Finder

Include Page
Polyspace Bug Finder_V
Polyspace Bug Finder_V

CERT C: Rule FIO47-C

Check for format string specifiers and arguments mismatch (rule fully covered)

PVS-Studio

Include Page
PVS-Studio_V
PVS-Studio_V

V510, V576
RuleChecker

Include Page
RuleChecker_V
RuleChecker_V

format-string-excessive-arguments
format-string-mismatched-arguments
invalid-format-string

Partially checked
Security Reviewer - Static Reviewer

Include Page
Security Reviewer - Static Reviewer_V
Security Reviewer - Static Reviewer_V

C81
C82
C83
C83
C84
C85
C86
C86

TrustInSoft Analyzer

Include Page
TrustInSoft Analyzer_V
TrustInSoft Analyzer_V

match format and argumentsExhaustively verified (see the compliant and the non-compliant example).

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