diff --git a/includes/ft_malloc.h b/includes/ft_malloc.h
index 4a756ea..41956e7 100644
--- a/includes/ft_malloc.h
+++ b/includes/ft_malloc.h
@@ -6,7 +6,7 @@
 /*   By: thrieg < thrieg@student.42mulhouse.fr>     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/17 15:06:51 by thrieg            #+#    #+#             */
-/*   Updated: 2025/11/28 17:24:33 by thrieg           ###   ########.fr       */
+/*   Updated: 2025/12/08 15:32:10 by thrieg           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -45,17 +45,19 @@ typedef struct s_zone
 
 typedef struct s_header
 {
-	size_t size;   // lock zone_mut
-	bool occupied; // lock zone_mut
+	size_t size;   // lock
+	bool occupied; // lock
 	t_zone *zone;
 	char padding[8];
 } t_header;
 
 typedef struct s_state
 {
-	t_zone *tiny_zone;	// lock g_mut
-	t_zone *small_zone; // lock g_mut
-	t_zone *large_zone; // lock g_mut, 1 zone per alloc for large
+	t_zone *tiny_zone;	  // lock g_mut
+	t_zone *small_zone;	  // lock g_mut
+	t_zone *large_zone;	  // lock g_mut, 1 zone per alloc for large
+	unsigned char patern; // patern set in MALLOC_PERTURB_ environment variable (lock g_mut)
+	bool is_init;
 } t_state;
 
 extern t_state g_state;
@@ -65,5 +67,6 @@ void *add_large(size_t size);
 void *add_small(size_t size);
 void *add_tiny(size_t size);
 void *add_page(t_type type);
+void init_env_variables();
 
 #endif
\ No newline at end of file
diff --git a/libft_malloc.so b/libft_malloc.so
deleted file mode 120000
index bc92c49..0000000
--- a/libft_malloc.so
+++ /dev/null
@@ -1 +0,0 @@
-libft_malloc_x86_64_Linux.so
\ No newline at end of file
diff --git a/libft_malloc_x86_64_Linux.so b/libft_malloc_x86_64_Linux.so
deleted file mode 100755
index 053a091..0000000
Binary files a/libft_malloc_x86_64_Linux.so and /dev/null differ
diff --git a/main_bonus.c b/main_bonus.c
index c3601dd..f19cf6d 100644
--- a/main_bonus.c
+++ b/main_bonus.c
@@ -6,7 +6,7 @@
 /*   By: thrieg < thrieg@student.42mulhouse.fr>     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/28 17:23:45 by thrieg            #+#    #+#             */
-/*   Updated: 2025/11/28 20:02:06 by thrieg           ###   ########.fr       */
+/*   Updated: 2025/12/08 14:22:46 by thrieg           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/result.txt b/result.txt
index 8f33f6b..870018b 100644
--- a/result.txt
+++ b/result.txt
@@ -16,7 +16,7 @@ size: 12288
 new allocated header:
 size: 16
 --------------------------------
-0x722bd87cb040: 00 01 02 03 04 05 06 07 08 09 00 00 00 00 00 00 
+0x7ce13735b040: 00 01 02 03 04 05 06 07 08 09 55 55 55 55 55 55 
 --------------------------------
 new free header:
 size: 12176
@@ -29,30 +29,30 @@ size: 413696
 new allocated header:
 size: 112
 --------------------------------
-0x722bd874c040: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
-0x722bd874c050: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
-0x722bd874c060: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
-0x722bd874c070: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
-0x722bd874c080: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
-0x722bd874c090: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
-0x722bd874c0a0: aa aa aa aa 00 00 00 00 00 00 00 00 00 00 00 00 
+0x7ce1372de040: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
+0x7ce1372de050: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
+0x7ce1372de060: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
+0x7ce1372de070: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
+0x7ce1372de080: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
+0x7ce1372de090: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
+0x7ce1372de0a0: aa aa aa aa 55 55 55 55 55 55 55 55 55 55 55 55 
 --------------------------------
 new allocated header:
 size: 208
 --------------------------------
-0x722bd874c0d0: 00 00 00 00 02 00 00 00 04 00 00 00 06 00 00 00 
-0x722bd874c0e0: 08 00 00 00 0a 00 00 00 0c 00 00 00 0e 00 00 00 
-0x722bd874c0f0: 10 00 00 00 12 00 00 00 14 00 00 00 16 00 00 00 
-0x722bd874c100: 18 00 00 00 1a 00 00 00 1c 00 00 00 1e 00 00 00 
-0x722bd874c110: 20 00 00 00 22 00 00 00 24 00 00 00 26 00 00 00 
-0x722bd874c120: 28 00 00 00 2a 00 00 00 2c 00 00 00 2e 00 00 00 
-0x722bd874c130: 30 00 00 00 32 00 00 00 34 00 00 00 36 00 00 00 
-0x722bd874c140: 38 00 00 00 3a 00 00 00 3c 00 00 00 3e 00 00 00 
-0x722bd874c150: 40 00 00 00 42 00 00 00 44 00 00 00 46 00 00 00 
-0x722bd874c160: 48 00 00 00 4a 00 00 00 4c 00 00 00 4e 00 00 00 
-0x722bd874c170: 50 00 00 00 52 00 00 00 54 00 00 00 56 00 00 00 
-0x722bd874c180: 58 00 00 00 5a 00 00 00 5c 00 00 00 5e 00 00 00 
-0x722bd874c190: 60 00 00 00 62 00 00 00 00 00 00 00 00 00 00 00 
+0x7ce1372de0d0: 00 00 00 00 02 00 00 00 04 00 00 00 06 00 00 00 
+0x7ce1372de0e0: 08 00 00 00 0a 00 00 00 0c 00 00 00 0e 00 00 00 
+0x7ce1372de0f0: 10 00 00 00 12 00 00 00 14 00 00 00 16 00 00 00 
+0x7ce1372de100: 18 00 00 00 1a 00 00 00 1c 00 00 00 1e 00 00 00 
+0x7ce1372de110: 20 00 00 00 22 00 00 00 24 00 00 00 26 00 00 00 
+0x7ce1372de120: 28 00 00 00 2a 00 00 00 2c 00 00 00 2e 00 00 00 
+0x7ce1372de130: 30 00 00 00 32 00 00 00 34 00 00 00 36 00 00 00 
+0x7ce1372de140: 38 00 00 00 3a 00 00 00 3c 00 00 00 3e 00 00 00 
+0x7ce1372de150: 40 00 00 00 42 00 00 00 44 00 00 00 46 00 00 00 
+0x7ce1372de160: 48 00 00 00 4a 00 00 00 4c 00 00 00 4e 00 00 00 
+0x7ce1372de170: 50 00 00 00 52 00 00 00 54 00 00 00 56 00 00 00 
+0x7ce1372de180: 58 00 00 00 5a 00 00 00 5c 00 00 00 5e 00 00 00 
+0x7ce1372de190: 60 00 00 00 62 00 00 00 55 55 55 55 55 55 55 55 
 --------------------------------
 new free header:
 size: 413248
@@ -101,8 +101,8 @@ size: 12288
 new allocated header:
 size: 32
 --------------------------------
-0x722bd87cb040: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 
-0x722bd87cb050: 10 11 12 13 00 00 00 00 00 00 00 00 00 00 00 00 
+0x7ce13735b040: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 
+0x7ce13735b050: 10 11 12 13 55 55 55 55 55 55 55 55 55 55 55 55 
 --------------------------------
 new free header:
 size: 12160
@@ -115,198 +115,198 @@ size: 413696
 new allocated header:
 size: 1008
 --------------------------------
-0x722bd874c040: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 
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 --------------------------------
 new allocated header:
 size: 2000
 --------------------------------
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diff --git a/srcs/bonus_utils.o b/srcs/bonus_utils.o
deleted file mode 100644
index 63358b8..0000000
Binary files a/srcs/bonus_utils.o and /dev/null differ
diff --git a/srcs/ft_calloc.c b/srcs/ft_calloc.c
index bfcbcf2..51536c1 100644
--- a/srcs/ft_calloc.c
+++ b/srcs/ft_calloc.c
@@ -6,7 +6,7 @@
 /*   By: thrieg < thrieg@student.42mulhouse.fr>     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/25 11:47:16 by thrieg            #+#    #+#             */
-/*   Updated: 2025/11/28 16:41:16 by thrieg           ###   ########.fr       */
+/*   Updated: 2025/12/08 15:36:52 by thrieg           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/srcs/ft_calloc.o b/srcs/ft_calloc.o
deleted file mode 100644
index 56a0ec3..0000000
Binary files a/srcs/ft_calloc.o and /dev/null differ
diff --git a/srcs/ft_free.c b/srcs/ft_free.c
index 52abc7e..aa9889c 100644
--- a/srcs/ft_free.c
+++ b/srcs/ft_free.c
@@ -6,7 +6,7 @@
 /*   By: thrieg < thrieg@student.42mulhouse.fr>     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/19 15:44:05 by thrieg            #+#    #+#             */
-/*   Updated: 2025/11/25 16:21:10 by thrieg           ###   ########.fr       */
+/*   Updated: 2025/12/08 15:34:11 by thrieg           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -65,6 +65,8 @@ int defrag_zone(t_zone *zone)
 void free(void *ptr)
 {
 	pthread_mutex_lock(&g_mut);
+	if (!g_state.is_init)
+		init_env_variables(); // shouldn't ever happen because free can't be called first, but it protects the program
 	if (!ptr)
 		return ((void)pthread_mutex_unlock(&g_mut));
 	t_header *header = ((t_header *)ptr) - 1;
@@ -84,6 +86,8 @@ void free(void *ptr)
 		void *ptr = header->zone;
 		size_t len = header->zone->size;
 		munmap(ptr, len);
+		pthread_mutex_unlock(&g_mut);
+		return;
 	}
 	else if (header->zone->type == E_SMALL)
 	{
@@ -95,5 +99,12 @@ void free(void *ptr)
 		header->occupied = false;
 		defrag_zone(header->zone);
 	}
+	else
+	{
+		pthread_mutex_unlock(&g_mut);
+		return; // we didn't allocate this ptr
+	}
+	if (g_state.patern)
+		ft_memset(ptr, g_state.patern ^ 0xFF, header->size); // doesn't need to lock because we only modify the user pointer and the user doesn't have accces to it yet
 	pthread_mutex_unlock(&g_mut);
 }
diff --git a/srcs/ft_free.o b/srcs/ft_free.o
deleted file mode 100644
index 0b60984..0000000
Binary files a/srcs/ft_free.o and /dev/null differ
diff --git a/srcs/ft_malloc.c b/srcs/ft_malloc.c
index 099d2fe..6c30840 100644
--- a/srcs/ft_malloc.c
+++ b/srcs/ft_malloc.c
@@ -6,7 +6,7 @@
 /*   By: thrieg < thrieg@student.42mulhouse.fr>     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/17 15:02:55 by thrieg            #+#    #+#             */
-/*   Updated: 2025/11/25 14:30:44 by thrieg           ###   ########.fr       */
+/*   Updated: 2025/12/08 15:37:27 by thrieg           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,6 +15,8 @@
 void *malloc(size_t size)
 {
 	pthread_mutex_lock(&g_mut);
+	if (!g_state.is_init)
+		init_env_variables();
 	if (!size || size % ALLIGN_BYTES)
 		size = ((size / ALLIGN_BYTES) + 1) * ALLIGN_BYTES;
 	void *ret = NULL;
@@ -31,5 +33,7 @@ void *malloc(size_t size)
 		ret = add_tiny(size);
 	}
 	pthread_mutex_unlock(&g_mut);
+	if (g_state.patern)
+		ft_memset(ret, g_state.patern, size); // doesn't need to lock because we only modify the user pointer and the user doesn't have accces to it yet
 	return (ret);
 }
diff --git a/srcs/ft_malloc.o b/srcs/ft_malloc.o
deleted file mode 100644
index 2ddfc4a..0000000
Binary files a/srcs/ft_malloc.o and /dev/null differ
diff --git a/srcs/ft_realloc.c b/srcs/ft_realloc.c
index 98df6c3..4776ddc 100644
--- a/srcs/ft_realloc.c
+++ b/srcs/ft_realloc.c
@@ -6,7 +6,7 @@
 /*   By: thrieg < thrieg@student.42mulhouse.fr>     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/25 11:47:23 by thrieg            #+#    #+#             */
-/*   Updated: 2025/11/28 16:37:22 by thrieg           ###   ########.fr       */
+/*   Updated: 2025/12/08 15:37:18 by thrieg           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -39,6 +39,11 @@ void *realloc(void *ptr, size_t size)
 		size = ((size / ALLIGN_BYTES) + 1) * ALLIGN_BYTES;
 	void *ret = NULL;
 	pthread_mutex_lock(&g_mut);
+	if (!g_state.is_init)
+	{
+		init_env_variables(); // realloc shouldn't ever be called first with a non-NULL ptr
+		return (NULL);		  // should I just let it segfault here like the real realloc?
+	}
 	t_header *header = ((t_header *)ptr) - 1;
 	if (header->zone->type == E_LARGE)
 	{
@@ -80,6 +85,7 @@ void *realloc(void *ptr, size_t size)
 			if (next_header && !next_header->occupied && (header->size + next_header->size + sizeof(t_header)) >= size)
 			{
 				const size_t available_space = (header->size + next_header->size + sizeof(t_header));
+				const size_t original_space = header->size;
 				if (available_space - size > sizeof(t_header))
 				{
 					// Split the block: create a new header in the remaining space
@@ -96,7 +102,10 @@ void *realloc(void *ptr, size_t size)
 				{
 					header->size = available_space;
 				}
-				ret = ptr;
+				pthread_mutex_unlock(&g_mut);
+				if (g_state.patern)
+					ft_memset((char *)ptr + original_space, g_state.patern, header->size - original_space); // should I use original_size to only perturb the actually requested bytes instead of the bytes I allocate?
+				return (ptr);
 			}
 			else
 			{
diff --git a/srcs/ft_realloc.o b/srcs/ft_realloc.o
deleted file mode 100644
index cedb7e1..0000000
Binary files a/srcs/ft_realloc.o and /dev/null differ
diff --git a/srcs/init_state.c b/srcs/init_state.c
index cc82718..032e684 100644
--- a/srcs/init_state.c
+++ b/srcs/init_state.c
@@ -6,14 +6,27 @@
 /*   By: thrieg < thrieg@student.42mulhouse.fr>     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/18 16:44:13 by thrieg            #+#    #+#             */
-/*   Updated: 2025/11/28 16:41:55 by thrieg           ###   ########.fr       */
+/*   Updated: 2025/12/08 15:32:55 by thrieg           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "../includes/ft_malloc.h"
 
 pthread_mutex_t g_mut = PTHREAD_MUTEX_INITIALIZER;
-t_state g_state = {.tiny_zone = NULL, .small_zone = NULL, .large_zone = NULL};
+t_state g_state = {.tiny_zone = NULL, .small_zone = NULL, .large_zone = NULL, .patern = 0, .is_init = false};
+
+void init_env_variables()
+{
+	char *env = getenv("MALLOC_PERTURB_"); // this doesn't call malloc, returns a pointer from **environ
+	if (env)
+	{
+		int overflow = 0;
+		int v = ft_atoi(env, &overflow);
+		if (!overflow && v > 0 && v <= 255)
+			g_state.patern = (unsigned char)v;
+	}
+	g_state.is_init = true;
+}
 
 // only call this for TINY or SMALL
 void *add_page(t_type type)
diff --git a/srcs/init_state.o b/srcs/init_state.o
deleted file mode 100644
index 3cc3cef..0000000
Binary files a/srcs/init_state.o and /dev/null differ
diff --git a/test_show b/test_show
deleted file mode 100755
index 4f74dc0..0000000
Binary files a/test_show and /dev/null differ