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abnormal termination [Open Group 2008]
Abnormal termination occurs when requested by the
abort() function or when some signals are received. See also normal terminationend [ISO/IEC/IEEE 24765:2010]Termination of a process prior to completion.
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abnormal program termination See abnormal end.
Anchor analyzer analyzer
analyzer [ISO/IEC TS 17961:2013]
Mechanism that diagnoses
Mechanism that diagnoses coding flaws in software programs.
NOTE
Analyzers may include static analysis tools, tools within a compiler suite, or tools in other contexts.
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async-signal-safe function [ISO/IEC 9945:2008]
A function that may be invoked, without restriction, from signal-catching functions. No function (defined in ISO/IEC 9945) is async-signal-safe unless explicitly described as such. See also asynchronous-safe.
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asynchronous-safe function [GNU Pth]
A function is asynchronous-safe, or asynchronous-signal safe, if it can be called safely and without side effects from within a signal handler context. That is, it must be able to be interrupted at any point to run linearly out of sequence without causing an inconsistent state. It must also function properly when global data might itself be in an inconsistent state. Some asynchronous-safe operations are listed here:
- call Call the
signal()function to reinstall a signal handler. - unconditionally Unconditionally modify a
volatile sig_atomic_tvariable (as modification to this type is atomic). - call Call the
_Exit()function to immediately terminate program execution. - invoke Invoke an asynchronous-safe function, as specified by your the implementation.
Few functions are portably asynchronous-safe. If a function performs any other operations, it is probably not portably asynchronous-safe.
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availability [IEEE Std 610.12 1990]
The degree to which a system or component is operational and accessible when required for use. Often expressed as a probability.
| Anchor | conforming program | conforming program |
|---|
Conforming programs may depend on nonportable features of a conforming implementation.
Tracking of value constraints along nonexcluded paths through the code.
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condition predicate
An expression constructed from the variables of a function that must be true for a thread to be allowed to continue execution.
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conforming [ISO/IEC 9899:2011]
Conforming programs may depend on nonportable features of a conforming implementation.
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critical sections
Code that accesses shared data and would otherwise be protected from data races.
Anchor dangling pointer dangling pointer
dangling pointer
A pointer to deallocated memory.
Anchor data flow analysis data flow analysis
data flow analysis
Tracking of value constraints along nonexcluded paths through the code.
NOTE
Tracking NOTE 1 Tracking can be performed intraprocedurally, with various assumptions made about what happens at function call boundaries, or interprocedurally, where values are tracked flowing into function calls (directly or indirectly) as arguments and flowing back out either as return values or indirectly through arguments.
NOTE 2 Data flow analysis may or may not track values flowing into or out of the heap or take into account global variables. When this specification refers to values flowing, the key point is contrast with variables or expressions , because a given variable or expression may hold different values along different paths , and a given value may be held by multiple variables or expressions along a path.
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data race [ISO/IEC 9899:2011]
The execution of a program contains a data race if it contains two conflicting actions in different threads, at least one of which is not atomic, and neither happens before the other. Any such data race results in undefined behavior.
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denial-of-service attack
Also DoS attack. An attempt to make a computer resource unavailable to its intended users.
Anchor diagnostic message diagnostic message
diagnostic message [ISO/IEC 9899:2011]
According to the C11 standard, a diagnostic message is a message A message belonging to an implementation-defined subset of the implementation’s message output. A diagnostic message may indicate a constraint violation , or a valid but questionable language construct. Messages typically include the file name and line number pointing to the offending code construct. In addition, implementations also often indicate the severity of the problem. While Although the C standard doesn't Standard does not specify any such requirement, the most severe problems often cause implementations to fail to successfully translate a translation unit. Diagnostics output in such cases are termed errors. Other problems may cause implementations to simply issue a warning message and continue translating the rest of the program.Anchor
error
A diagnostic message generated when source code is encountered that prevents an implementation from translating a translation unit.
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severe problems often cause implementations to fail to fully translate a translation unit. Diagnostics output in such cases are termed errors. Other problems may cause implementations simply to issue a warning message and continue translating the rest of the program. See error message and warning message.
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double-free vulnerability
An exploitable error resulting from the same allocated object being freed more than once.
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error message
A diagnostic message generated when source code is encountered that prevents an implementation from translating a translation unit. See diagnostic message and warning message.
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error tolerance
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fail safe [IEEE Std 610.12 1990]
Pertaining to a system or component that automatically places itself in a safe operating mode in the event of a failure—for example, a traffic light that reverts to blinking red in all directions when normal operation fails.
Anchor
Pertaining to a system or component that continues to provide partial operational capability in the event of certain failures—for example, a traffic light that continues to alternate between red and green if the yellow light failsThe ability of a system or component to continue normal operation despite the presence of erroneous inputs.
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A diagnostic message which causes an implementation not to perform the translation
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exploit [ISO/IEC TS 17961:2013]
Technique that takes advantage of a security vulnerability to violate an explicit or implicit security policy.
| Anchor | fault tolerance | fault tolerance |
|---|
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fail safe [IEEE Std 610.12 1990]
The ability of Pertaining to a system or component to continue normal operation despite the presence of hardware or software faultsthat automatically places itself in a safe operating mode in the event of a failure—for example, a traffic light that reverts to blinking red in all directions when normal operation fails.
| Anchor | freestanding environment | freestanding environment |
|---|
An environment in which C program execution may take place without any benefit of an operating system. Program startup might occur at some function other than
main(), complex types might not be implemented, and only certain minimal library facilities are guaranteed to be available.
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fail soft [IEEE Std 610.12 1990]
Pertaining to a system or component that continues to provide partial operational capability in the event of certain failures—for example, a traffic light that continues to alternate between red and green if the yellow light fails.
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fatal diagnostic
A diagnostic message that causes an implementation not to perform the translation.
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fault tolerance [IEEE Std 610.12 1990]
The ability of a system or component to continue normal operation despite the presence of hardware or software faults.
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freestanding
A
#define preprocessing directive that defines an identifier immediately followed by zero or more parameters, the ellipsis (...), or a combination of the two, enclosed in parentheses, similar syntactically to a function call. Subsequent instances of the macro name followed by a parenthesized list of arguments in a translation unit are replaced by the replacement list of preprocessing tokens that constitute the remainder of the directive. See also object-like macro and unsafe function-like macro.An environment that is not freestandingin which C program execution may take place without any benefit of an operating system. Program startup occurs at might occur at some function other than
main(), complex types are might not be implemented, and all C Standard only certain minimal library facilities are guaranteed to be available.| Anchor | implementation | implementation |
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function-like macro [ISO/IEC 9899:2011]
Particular set of software, running in a particular translation environment under particular control options, that performs translation of programs for, and supports execution of functions in, a particular execution environment.
Unspecified behavior whereby each implementation documents how the choice is made.
A library function return value on error that can never be returned by a successful call to that library function.A
#define preprocessing directive that defines an identifier immediately followed by zero or more parameters, the ellipsis (...), or a combination of the two, enclosed in parentheses, similar syntactically to a function call. Subsequent instances of the macro name followed by a parenthesized list of arguments in a translation unit are replaced by the replacement list of preprocessing tokens that constitute the remainder of the directive. See object-like macro and unsafe function-like macro.| Anchor | ||||
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hosted environment [ISO/IEC 9899:2011]
An environment that is not freestanding. Program startup occurs at
main(), complex types are implemented, and all C standard library facilities are available.| Anchor | ||||
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implementation [ISO/IEC 9899:2011]
Particular set of software, running in a particular translation environment under particular control options, that performs translation of programs for, and supports execution of functions in, a particular execution environment.
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implementation-defined behavior
A type that describes an identifier but lacks information needed to determine the size of the identifier.
Either an unspecified value or a trap representationUnspecified behavior whereby each implementation documents how the choice is made.
| Anchor | invalid pointer | invalid pointer |
|---|
A pointer that is not a valid pointer
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in-band error indicator[ISO/IEC TS 17961:2013]
A library function return value on error that can never be returned by a successful call to that library function.
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Every operation or method invocation executes to completion without interruptions, even if it goes against safety.
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incomplete type [ISO/IEC 9899:2011]
A type that describes an identifier but lacks information needed to determine the size of the identifier.
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indeterminate value
Behavior that depends on local conventions of nationality, culture, and language that each implementation documents
Either an unspecified value or a trap representation.
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invalid pointer
A pointer that is not a valid pointer.
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An expression with an object type or an incomplete type other than
void. The name lvalue comes originally from the assignment expression E1 = E2, in which the left operand E1 is required to be a (modifiable) lvalue. It is perhaps better considered as representing an object "locator value."Methods, techniques, processes, tools, or runtime libraries that can prevent or limit exploits against vulnerabilities.
Result of an operation performed on an untainted value that yields either an undefined result (such as the result of signed integer overflow), the result of right-shifting a negative number, implicit conversion to an integral type where the value cannot be represented in the destination type, or unsigned integer wrapping.
EXAMPLEint j = INT_MAX + 1; // j is mutilated
char c = 1234; // c is mutilated if char is eight bits
unsigned int u = 0U - 1; // u is mutilated
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liveness
Every operation or method invocation executes to completion without interruptions, even if it goes against safety.
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locale-specific behavior [ISO/IEC 9899:2011]
Behavior that depends on local conventions of nationality, culture, and language that each implementation documents.
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lvalue [ISO/IEC 9899:2011]
An expression with an object type or an incomplete type other than
void. The name lvalue comes originally from the assignment expression E1 = E2, in which the left operand E1 is required to be a (modifiable) lvalue. It is perhaps better considered as representing an object "locator value."| Anchor | ||||
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mitigation [Seacord 2005a]
Methods, techniques, processes, tools, or runtime libraries that can prevent or limit exploits against vulnerabilities.
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nonpersistent signal handler
Signal handler running on an implementation that requires the program to again register the signal handler after occurrences of the signal to catch subsequent occurrences of that signal.
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normal program termination [Open Group 2008IEEE Std 1003.1-2013]
Normal termination occurs by a return from
main(), when requested with the exit(), _exit(), or _Exit() functions, or when the last thread in the process terminates by returning from its start function , by calling the pthread_exit() function, or through cancellation. See also abnormal termination.| Anchor | ||||
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object-like macro [ISO/IEC 9899:2011]
A
#define preprocessing directive that defines an identifier with no parentheses. Subsequent instances of the macro name in a translation unit are replaced by the replacement list of preprocessing tokens that constitute the remainder of the directive. See also function-like macro.| Anchor | ||||
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out-of-band error indicatorindicator [ISO/IEC TS 17961:2013]
A library function return value used to indicate nothing but the error status.
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out-of-domain value [ISO/IEC TS 17961:2013]
One of a set of values that is not in the domain of a particular operator or function.
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reentrant [Dowd 2006]
A function is reentrant if multiple instances of the same function can run in the same address space concurrently without creating the potential for inconsistent statesISO/IEC/IEEE 24765:2010 ]
Pertaining to a software module that can be entered as part of one process while also in execution as part of another process and still achieve the desired results.
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reliability [IEEE Std 610.12 1990]
The ability of a system or component to perform its required functions under stated conditions for a specified period of time.
Operands and arguments whose domain is a subset of the domain described by their types.
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IEEE Std 610.12 1990]
The ability of a system or component to perform its required functions under stated conditions for a specified period of time.
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restricted sink [ISO/IEC 9899:2011]
Operands and arguments whose domain is a subset of the domain described by their types.
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robustness [IEEE Std 610.12 1990]
The degree to which a system or component can function correctly in the presence of invalid inputs or stressful environmental conditions.
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rvalue [ISO/IEC 9899:2011]
Value of an expression.
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sanitize [ISO/IEC TS 17961:2013]
Assure by testing or replacement that a tainted or other value conforms to the constraints imposed by one or more restricted sinks into which it may flow.
NOTE
If the value does not conform, either the path is diverted to avoid using the value or a different, known-conforming value is substituted.
EXAMPLE Adding substituted—for example, adding a null character to the end of a buffer before passing it as an argument to the strlen function.
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security flaw [Seacord 2005aISO/IEC TS 17961:2013]
Defect that poses a potential security risk.
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side effect [ISO/IEC 9899:2011]
Changes in the state of the execution environment achieved by accessing a volatile object, modifying an object, modifying a file, or calling a function that does any of those operations.
NOTE
The IEC 60559 standard for binary floating-point arithmetic requires certain user-accessible status flags and control modes. Floating-point operations implicitly set the status flags; modes affect result values of floating-point operations. Implementations that support such floatinga floating-point state are required to regard changes to it as side effects. These are detailed in Annex F of the C Standard.
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static analysis [Chess 2007ISO/IEC TS 17961:2013]
Any process for assessing code without executing it (p. 3).
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strictly conforming [ISO/IEC 9899:2011]
A strictly conforming program is one that uses only those features of the language and library specified in the international standard. Strictly conforming programs are intended to be maximally portable among conforming implementations and cannot, for example, depend on implementation-defined behavior.
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string [ISO/IEC 9899:2011]
A string is a contiguous sequence of characters terminated by and including the first null character.
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tainted sourcesource [ISO/IEC TS 17961:2013]
External source of untrusted data.
NOTE
Tainted sources include
- parameters to the
main()function, - the returned values from
localeconv(),fgetc(),getc,getchar,()fgetwc,()getwc, and()getwchar, and() - the strings produced by
getenv,()fscanf,()vfscanf(),vscanf,()fgets(),fread,()fwscanf(),vfwscanf,()vwscanf,()wscanf, and()fgetws.()
- parameters to the
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tainted value [ISO/IEC TS 17961:2013]
Value derived from a tainted source that has not been sanitized.
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target implementation [ISO/IEC TS 17961:2013]
Implementation of the C programming language whose environmental limits and implementation-defined behavior are assumed by the analyzer during the analysis of a program.
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undefined behavior (UB) [ISO/IEC 9899:2011]
Behavior, upon use of a nonportable or erroneous program construct or of erroneous data, for which the standard C Standard imposes no requirements. An example of undefined behavior is the behavior on integer overflow.
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untrusted data [ISO/IEC 989911889-1:20112009]
Data originating from outside of a trust boundary [ISO/IEC 11889-1:2009].
| Anchor | ||||
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valid pointer [ISO/IEC 9899TS 17961:20112013]
Pointer that refers to an element within an array or one past the last element of an array. See invalid pointer.
NOTE 1
For the purposes of this definition, a pointer to an object that is not an element of an array behaves the same as a pointer to the first element of an array of length one with the type of the object as its element type. (See C Standard, subclause 6.5.8, paragraph 4.)
NOTE 2 For the purposes of this definition, an object can be considered to be an array of a certain number of bytes; that number is the size of the object , as produced by the sizeof operator. (See C Standard, subclause 6.3.2.3, paragraph 7.)
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validation [IEC 61508-4]
Confirmation by examination and provision of objective evidence that the particular requirements for a specific intended use are fulfilled.
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vulnerability [Seacord 2005aISO/IEC TS 17961:2013]
Set of conditions that allows an attacker to violate an explicit or implicit security policy.
| Anchor | ||||
|---|---|---|---|---|
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warning message
A diagnostic message generated when source code is encountered that does not prevent an implementation from translating a translation unit. See diagnostic message and error message.
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