fuzz: basic setup

.gitignore

@@ -35,3 +35,6 @@ compile_commands.json
 .vscode
 report.txt
 zms_testeur
+fuzz
+*CORPUS
+crash-*

Makefile

@@ -1,5 +1,6 @@
 NAME = minishell
-DEBUG = -g -O0
+FUZZ = fuzz
+DEBUG = -g -O1
 # -fno-omit-frame-pointer is to prevent malloc stacktraces from being truncated,
 # see "My malloc stacktraces are too short" here:
 # https://github.com/google/sanitizers/wiki/AddressSanitizer
@@ -118,6 +119,7 @@ srcs = \
 objs = $(srcs:.c=.o)
 export objs
 minishell_objs = $(addsuffix .o,src/$(NAME)) $(objs)
+fuzz_objs = $(addsuffix .o,src/$(FUZZ)) $(objs)
 all_objs = $(minishell_objs)
 deps = $(all_objs:.o=.d)
 
@@ -131,6 +133,10 @@ all: $(NAME)
 $(NAME): $(minishell_objs) $(LIBFT)
 	$(CC) $(CFLAGS) -o $@ $(minishell_objs) $(LINCLUDE) $(LDLIBS)
 
+$(FUZZ): CFLAGS += -fsanitize=fuzzer,address,undefined
+$(FUZZ): $(fuzz_objs) $(LIBFT)
+	$(CC) $(CFLAGS) -o $@ $(fuzz_objs) $(LINCLUDE) $(LDLIBS)
+
 $(LIBFT): CFLAGS+=-DBUFFER_SIZE=1
 $(LIBFT):
 	+$(MAKE) -C $(LIBFTDIR)

src/fuzz.c

@@ -0,0 +1,39 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   fuzz.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <kcolin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/04/30 16:01:18 by kcolin            #+#    #+#             */
+/*   Updated: 2025/04/30 17:13:17 by kcolin           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "fcntl.h"
+#include "minishell.h"
+#include "parser/cmd/cmd_destroy.h"
+#include "parser/cmd_parsing.h"
+#include "unistd.h"
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  t_minishell app;
+  bzero(&app, sizeof(t_minishell));
+  int null = open("/dev/null", O_RDONLY, 0);
+
+  char *line = (char *)calloc(size + 1, sizeof(char));
+  memcpy(line, data, size);
+
+  dup2(null, STDIN_FILENO);
+  close(null);
+  t_cmd *cmd = minishell_parse(&app, line);
+
+  cmd_destroy(cmd);
+  free(line);
+
+  return (0);  // Values other than 0 and -1 are reserved for future use.
+}