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SEI CERT C

SEI CERT C is a secure coding standard, these pages are a copy of:

SEI CERT C Rules

Last update: 2023-07-04 03:00:02

ARR30-C. Do not form or use out-of-bounds pointers or array subscripts

ARR32-C. Ensure size arguments for variable length arrays are in a valid range

ARR36-C. Do not subtract or compare two pointers that do not refer to the same array

ARR37-C. Do not add or subtract an integer to a pointer to a non-array object

ARR38-C. Guarantee that library functions do not form invalid pointers

ARR39-C. Do not add or subtract a scaled integer to a pointer

CON30-C. Clean up thread-specific storage

CON31-C. Do not destroy a mutex while it is locked

CON32-C. Prevent data races when accessing bit-fields from multiple threads

CON33-C. Avoid race conditions when using library functions

CON34-C. Declare objects shared between threads with appropriate storage durations

CON35-C. Avoid deadlock by locking in a predefined order

CON36-C. Wrap functions that can spuriously wake up in a loop

CON37-C. Do not call signal() in a multithreaded program

CON38-C. Preserve thread safety and liveness when using condition variables

CON39-C. Do not join or detach a thread that was previously joined or detached

CON40-C. Do not refer to an atomic variable twice in an expression

CON41-C. Wrap functions that can fail spuriously in a loop

CON43-C. Do not allow data races in multithreaded code

DCL30-C. Declare objects with appropriate storage durations

DCL31-C. Declare identifiers before using them

DCL36-C. Do not declare an identifier with conflicting linkage classifications

DCL37-C. Do not declare or define a reserved identifier

DCL38-C. Use the correct syntax when declaring a flexible array member

DCL39-C. Avoid information leakage when passing a structure across a trust boundary

DCL40-C. Do not create incompatible declarations of the same function or object

DCL41-C. Do not declare variables inside a switch statement before the first case label

ENV30-C. Do not modify the object referenced by the return value of certain functions

ENV31-C. Do not rely on an environment pointer following an operation that may invalidate it

ENV32-C. All exit handlers must return normally

ENV34-C. Do not store pointers returned by certain functions

ERR30-C. Take care when reading errno

ERR32-C. Do not rely on indeterminate values of errno

ERR33-C. Detect and handle standard library errors

ERR34-C. Detect errors when converting a string to a number

EXP30-C. Do not depend on the order of evaluation for side effects

EXP32-C. Do not access a volatile object through a nonvolatile reference

EXP33-C. Do not read uninitialized memory

EXP34-C. Do not dereference null pointers

EXP35-C. Do not modify objects with temporary lifetime

EXP36-C. Do not cast pointers into more strictly aligned pointer types

EXP37-C. Call functions with the correct number and type of arguments

EXP39-C. Do not access a variable through a pointer of an incompatible type

EXP40-C. Do not modify constant objects

EXP42-C. Do not compare padding data

EXP43-C. Avoid undefined behavior when using restrict-qualified pointers

EXP44-C. Do not rely on side effects in operands to sizeof, _Alignof, or _Generic

EXP45-C. Do not perform assignments in selection statements

EXP46-C. Do not use a bitwise operator with a Boolean-like operand

EXP47-C. Do not call va_arg with an argument of the incorrect type

FIO30-C. Exclude user input from format strings

FIO32-C. Do not perform operations on devices that are only appropriate for files

FIO34-C. Distinguish between characters read from a file and EOF or WEOF

FIO37-C. Do not assume that fgets() or fgetws() returns a nonempty string when successful

FIO38-C. Do not copy a FILE object

FIO39-C. Do not alternately input and output from a stream without an intervening flush or positioning call

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

FIO41-C. Do not call getc(), putc(), getwc(), or putwc() with a stream argument that has side effects

FIO42-C. Close files when they are no longer needed

FIO45-C. Avoid TOCTOU race conditions while accessing files

FIO46-C. Do not access a closed file

FIO47-C. Use valid format strings

FLP30-C. Do not use floating-point variables as loop counters

FLP32-C. Prevent or detect domain and range errors in math functions

FLP34-C. Ensure that floating-point conversions are within range of the new type

FLP36-C. Preserve precision when converting integral values to floating-point type

FLP37-C. Do not use object representations to compare floating-point values

INT30-C. Ensure that unsigned integer operations do not wrap

INT31-C. Ensure that integer conversions do not result in lost or misinterpreted data

INT32-C. Ensure that operations on signed integers do not result in overflow

INT33-C. Ensure that division and remainder operations do not result in divide-by-zero errors

INT34-C. Do not shift an expression by a negative number of bits or by greater than or equal to the number of bits that exist in the operand

INT35-C. Use correct integer precisions

INT36-C. Converting a pointer to integer or integer to pointer

MEM30-C. Do not access freed memory

MEM31-C. Free dynamically allocated memory when no longer needed

MEM33-C. Allocate and copy structures containing a flexible array member dynamically

MEM34-C. Only free memory allocated dynamically

MEM35-C. Allocate sufficient memory for an object

MSC30-C. Do not use the rand() function for generating pseudorandom numbers

MSC32-C. Properly seed pseudorandom number generators

MSC33-C. Do not pass invalid data to the asctime() function

MSC37-C. Ensure that control never reaches the end of a non-void function

MSC38-C. Do not treat a predefined identifier as an object if it might only be implemented as a macro

MSC39-C. Do not call va_arg() on a va_list that has an indeterminate value

MSC40-C. Do not violate constraints

MSC41-C. Never hard code sensitive information

POS30-C. Use the readlink() function properly

POS34-C. Do not call putenv() with a pointer to an automatic variable as the argument

POS35-C. Avoid race conditions while checking for the existence of a symbolic link

POS36-C. Observe correct revocation order while relinquishing privileges

POS37-C. Ensure that privilege relinquishment is successful

POS38-C. Beware of race conditions when using fork and file descriptors

POS39-C. Use the correct byte ordering when transferring data between systems

POS44-C. Do not use signals to terminate threads

POS47-C. Do not use threads that can be canceled asynchronously

POS48-C. Do not unlock or destroy another POSIX thread's mutex

POS49-C. When data must be accessed by multiple threads, provide a mutex and guarantee no adjacent data is also accessed

POS50-C. Declare objects shared between POSIX threads with appropriate storage durations

POS51-C. Avoid deadlock with POSIX threads by locking in predefined order

POS52-C. Do not perform operations that can block while holding a POSIX lock

POS53-C. Do not use more than one mutex for concurrent waiting operations on a condition variable

POS54-C. Detect and handle POSIX library errors

PRE30-C. Do not create a universal character name through concatenation

PRE31-C. Avoid side effects in arguments to unsafe macros

PRE32-C. Do not use preprocessor directives in invocations of function-like macros

SIG30-C. Call only asynchronous-safe functions within signal handlers

SIG31-C. Do not access shared objects in signal handlers

SIG34-C. Do not call signal() from within interruptible signal handlers

SIG35-C. Do not return from a computational exception signal handler

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. Do not pass a non-null-terminated character sequence to a library function that expects a string

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

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

STR38-C. Do not confuse narrow and wide character strings and functions

WIN30-C. Properly pair allocation and deallocation functions