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missing-nul-cpp-string-memcpy-cpp.yml
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id: missing-nul-cpp-string-memcpy-copy-cpp
language: cpp
severity: warning
message: >-
The number of bytes copied from `$STR` does not include the NUL
terminator. This can lead to an out-of-bounds read and information
disclosure. One extra byte should be added to the length to ensure that
the NUL terminator is copied.
note: >-
[CWE-125]: Out-of-bounds Read
[REFERENCES]
- https://wiki.sei.cmu.edu/confluence/display/c/STR31-C.+Guarantee+that+storage+for+strings+has+sufficient+space+for+character+data+and+the+null+terminator
ast-grep-essentials: true
rule:
any:
- kind: qualified_identifier
- kind: identifier
pattern: $MEMFUNC
regex: ^(memcpy|wmemcpy|memmove|wmemmove|std::memcpy|std::wmemcpy|std::memmove|std::wmemmove)$
inside:
stopBy: end
any:
- kind: call_expression
all:
- has:
any:
- kind: qualified_identifier
- kind: identifier
nthChild: 1
pattern: $MEMFUNC
- has:
kind: argument_list
nthChild: 2
all:
- has:
pattern: $DEST
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
pattern: $STR.c_str()
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
pattern: strlen($STR.c_str())
nthChild:
position: 3
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 4
ofRule:
not:
kind: comment
# - pattern: $MEMFUNC($DEST, $STR.c_str(), strlen($STR.c_str()))
any:
- inside:
stopBy: end
follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- kind: call_expression
all:
- has:
any:
- kind: qualified_identifier
- kind: identifier
nthChild: 1
pattern: $MEMFUNC
- has:
kind: argument_list
nthChild: 2
all:
- has:
pattern: $DEST
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
pattern: $STR.c_str()
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
pattern: $STR.size()
nthChild:
position: 3
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 4
ofRule:
not:
kind: comment
# pattern: $MEMFUNC($DEST, $STR.c_str(), $STR.size())
any:
- inside:
stopBy: end
follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- kind: call_expression
all:
- has:
pattern: $MEMFUNC
any:
- kind: qualified_identifier
- kind: identifier
nthChild: 1
- has:
kind: argument_list
nthChild: 2
all:
- has:
pattern: $DEST
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
pattern: $STR.c_str()
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
pattern: $STR.length()
nthChild:
position: 3
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 4
ofRule:
not:
kind: comment
# pattern: $MEMFUNC($DEST, $STR.c_str(), $STR.length())
any:
- inside:
stopBy: end
follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- kind: call_expression
all:
- has:
nthChild: 1
any:
- kind: qualified_identifier
- kind: identifier
pattern: $MEMFUNC
- has:
nthChild: 2
kind: argument_list
all:
- has:
pattern: $DEST
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
pattern: $STR.c_str()
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
pattern: $LEN
nthChild:
position: 3
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 4
ofRule:
not:
kind: comment
# pattern: $MEMFUNC($DEST, $STR.c_str(), $LEN)
- all:
- any:
- follows:
stopBy: end
any:
- pattern: $LEN = strlen($STR.c_str());
- pattern: $SET $LEN = strlen($STR.c_str());
- inside:
stopBy: end
follows:
stopBy: end
any:
- pattern: $LEN = strlen($STR.c_str());
- pattern: $SET $LEN = strlen($STR.c_str());
- inside:
stopBy: end
follows:
stopBy: end
kind: declaration
has:
kind: init_declarator
all:
- has:
kind: identifier
pattern: $LEN
- has:
kind: call_expression
pattern: from.size()
- any:
- inside:
stopBy: end
follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- kind: call_expression
all:
- has:
any:
- kind: qualified_identifier
- kind: identifier
nthChild: 1
pattern: $MEMFUNC
- has:
kind: argument_list
all:
- has:
pattern: $DEST
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
pattern: $STR.c_str()
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
pattern: $LEN
nthChild:
position: 3
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 4
ofRule:
not:
kind: comment
# pattern: $MEMFUNC($DEST, $STR.c_str(), $LEN)
follows:
stopBy: end
any:
- pattern: $LEN = $STR.size();
- pattern: $SET $LEN = $STR.size();
any:
- inside:
stopBy: end
follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- kind: call_expression
all:
- has:
any:
- kind: qualified_identifier
- kind: identifier
nthChild: 1
pattern: $MEMFUNC
- has:
kind: argument_list
all:
- has:
pattern: $DEST
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
pattern: $STR.c_str()
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
pattern: $LEN
nthChild:
position: 3
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 4
ofRule:
not:
kind: comment
# pattern: $MEMFUNC($DEST, $STR.c_str(), $LEN)
- any:
- inside:
stopBy: end
follows:
stopBy: end
any:
- pattern: $LEN = $STR.length();
- pattern: $SET $LEN = $STR.length();
- follows:
stopBy: end
any:
- pattern: $LEN = $STR.length();
- pattern: $SET $LEN = $STR.length();
any:
- inside:
stopBy: end
follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;
- follows:
stopBy: end
any:
- pattern: $TYPE $DEST[$DIM] = $$$;
- pattern: $TYPE $DEST[$DIM];
- pattern: $TYPE *$DEST = $$$;