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07. Characters and Strings (STR)

Created by Robert C. Seacord, last modified by Kazunori Takeuchi on Nov 05, 2009

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Recommendations

STR00-C. Represent characters using an appropriate type

STR01-C. Adopt and implement a consistent plan for managing strings

STR02-C. Sanitize data passed to complex subsystems

STR03-C. Do not inadvertently truncate a null-terminated byte string

STR04-C. Use plain char for characters in the basic character set

STR05-C. Use pointers to const when referring to string literals

STR06-C. Do not assume that strtok() leaves the parse string unchanged

STR07-C. Use TR 24731 for remediation of existing string manipulation code

STR08-C. Use managed strings for development of new string manipulation code

STR09-C. Don't assume numeric values for expressions with type plain character

Rules

STR30-C. Do not attempt to modify string literals

STR31-C. Guarantee that storage for strings has sufficient space for character data and the null terminator

STR32-C. Null-terminate byte strings as required

STR33-C. Size wide character strings correctly

STR34-C. Cast characters to unsigned types before converting to larger integer sizes

STR35-C. Do not copy data from an unbounded source to a fixed-length array

STR36-C. Do not specify the bound of a character array initialized with a string literal

STR37-C. Arguments to character handling functions must be representable as an unsigned char

STR38-C. Do not use wide-char functions on narrow-char strings and vice versa

Risk Assessment Summary

Recommendation	Severity	Likelihood	Remediation Cost	Priority	Level
STR00-C	medium	probable	low	P12	L1
STR01-C	low	unlikely	high	P1	L3
STR02-C	high	likely	medium	P18	L1
STR03-C	medium	probable	medium	P8	L2
STR04-C	low	unlikely	low	P3	L3
STR05-C	low	unlikely	low	P3	L3
STR06-C	medium	likely	medium	P12	L1
STR07-C	high	probable	medium	P12	L1
STR08-C	high	probable	high	P6	L2

Rule	Severity	Likelihood	Remediation Cost	Priority	Level
STR30-C	low	likely	low	P9	L2
STR31-C	high	likely	medium	P18	L1
STR32-C	high	probable	medium	P12	L1
STR33-C	high	likely	medium	P18	L1
STR34-C	medium	probable	medium	P8	L2
STR35-C	high	likely	medium	P18	L1
STR36-C	high	probable	low	P18	L1
STR37-C	low	unlikely	low	P3	L3
STR38-C	high	likely	medium	P27	L1

Related Rules and Recommendations

FIO20-C. Avoid unintentional truncation when using fgets() or fgetws()

FIO30-C. Exclude user input from format strings

FIO40-C. Reset strings on fgets() or fgetws() failure

FIO47-C. Use valid format strings

INT07-C. Use only explicitly signed or unsigned char type for numeric values

POS30-C. Use the readlink() function properly

STR37-C. Arguments to character-handling functions must be representable as an unsigned char

ARR38-C. Do not add or subtract an integer to a pointer if the resulting value does not refer to a valid array element CERT C Secure Coding Standard

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