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security/secure-c

@mgreenly/ikigai
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Secure C Coding security skill

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SKILL.md

name security/secure-c
description Secure C Coding security skill

Secure C Coding

Avoid dangerous functions, use safe alternatives, enable compiler hardening.

Banned Functions → Safe Alternatives

Banned Why Use Instead
strcpy No bounds strncpy, strlcpy, snprintf
strcat No bounds strncat, strlcat
sprintf No bounds snprintf
gets Always unsafe fgets
scanf("%s") No bounds scanf("%Ns") with width
mktemp Race condition mkstemp
atoi No error detection strtol with validation

Compiler Hardening

CFLAGS += -fstack-protector-strong  # Stack canaries
CFLAGS += -D_FORTIFY_SOURCE=2       # Runtime buffer checks
CFLAGS += -fPIE -pie                # ASLR for executables
LDFLAGS += -Wl,-z,relro,-z,now      # GOT protection

Static Analysis

  • make lint - clang-tidy checks
  • cppcheck --enable=all
  • Compiler warnings: -Wall -Wextra -Werror

Review red flags: Any banned function, missing bounds on string ops, char buf[N] with unchecked input.