board: amlogic: fix buffler overflow in seria, mac & usid read

While meson_sm_read_efuse() doesn't overflow, the string is not
zero terminated and env_set*() will buffer overflow and add random
characters to environment.

Acked-by: Viacheslav Bocharov <adeep@lexina.in>
Link: https://lore.kernel.org/r/20240320-u-boot-fix-p200-serial-v2-1-972be646a301@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

9 files changed, 30 insertions, 15 deletions

diff --git a/board/amlogic/beelink-s922x/beelink-s922x.c b/board/amlogic/beelink-s922x/beelink-s922x.c
index adae27f..c277631 100644
--- a/board/amlogic/beelink-s922x/beelink-s922x.c
+++ b/board/amlogic/beelink-s922x/beelink-s922x.c
@@ -20,7 +20,7 @@
 
 int misc_init_r(void)
 {
-	u8 mac_addr[MAC_ADDR_LEN];
+	u8 mac_addr[MAC_ADDR_LEN + 1];
 	char efuse_mac_addr[EFUSE_MAC_SIZE], tmp[3];
 	ssize_t len;
 
@@ -41,6 +41,7 @@ int misc_init_r(void)
 			tmp[2] = '\0';
 			mac_addr[i] = hextoul(tmp, NULL);
 		}
+		mac_addr[MAC_ADDR_LEN] = '\0';
 
 		if (is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr("ethaddr", mac_addr);
diff --git a/board/amlogic/jethub-j100/jethub-j100.c b/board/amlogic/jethub-j100/jethub-j100.c
index 6a2c4ad..010fc0d 100644
--- a/board/amlogic/jethub-j100/jethub-j100.c
+++ b/board/amlogic/jethub-j100/jethub-j100.c
@@ -17,7 +17,7 @@
 
 int misc_init_r(void)
 {
-	u8 mac_addr[ARP_HLEN];
+	u8 mac_addr[ARP_HLEN + 1];
 	char serial[SM_SERIAL_SIZE];
 	u32 sid;
 
@@ -34,6 +34,7 @@ int misc_init_r(void)
 		mac_addr[3] = (sid >> 16) & 0xff;
 		mac_addr[4] = (sid >>  8) & 0xff;
 		mac_addr[5] = (sid >>  0) & 0xff;
+		mac_addr[ARP_HLEN] = '\0';
 
 		eth_env_set_enetaddr("ethaddr", mac_addr);
 	}
diff --git a/board/amlogic/jethub-j80/jethub-j80.c b/board/amlogic/jethub-j80/jethub-j80.c
index 185880d..0b78166 100644
--- a/board/amlogic/jethub-j80/jethub-j80.c
+++ b/board/amlogic/jethub-j80/jethub-j80.c
@@ -27,9 +27,9 @@
 
 int misc_init_r(void)
 {
-	u8 mac_addr[EFUSE_MAC_SIZE];
-	char serial[EFUSE_SN_SIZE];
-	char usid[EFUSE_USID_SIZE];
+	u8 mac_addr[EFUSE_MAC_SIZE + 1];
+	char serial[EFUSE_SN_SIZE + 1];
+	char usid[EFUSE_USID_SIZE + 1];
 	ssize_t len;
 	unsigned int adcval;
 	int ret;
@@ -37,6 +37,7 @@ int misc_init_r(void)
 	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
 		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
 					  mac_addr, EFUSE_MAC_SIZE);
+		mac_addr[len] = '\0';
 		if (len == EFUSE_MAC_SIZE && is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr("ethaddr", mac_addr);
 		else
@@ -46,6 +47,7 @@ int misc_init_r(void)
 	if (!env_get("serial")) {
 		len = meson_sm_read_efuse(EFUSE_SN_OFFSET, serial,
 					  EFUSE_SN_SIZE);
+		serial[len] = '\0';
 		if (len == EFUSE_SN_SIZE)
 			env_set("serial", serial);
 	}
@@ -53,6 +55,7 @@ int misc_init_r(void)
 	if (!env_get("usid")) {
 		len = meson_sm_read_efuse(EFUSE_USID_OFFSET, usid,
 					  EFUSE_USID_SIZE);
+		usid[len] = '\0';
 		if (len == EFUSE_USID_SIZE)
 			env_set("usid", usid);
 	}
diff --git a/board/amlogic/odroid-n2/odroid-n2.c b/board/amlogic/odroid-n2/odroid-n2.c
index 2135457..a4bcc62 100644
--- a/board/amlogic/odroid-n2/odroid-n2.c
+++ b/board/amlogic/odroid-n2/odroid-n2.c
@@ -107,7 +107,7 @@ static int odroid_detect_variant(void)
 
 int misc_init_r(void)
 {
-	u8 mac_addr[MAC_ADDR_LEN];
+	u8 mac_addr[MAC_ADDR_LEN + 1];
 	char efuse_mac_addr[EFUSE_MAC_SIZE], tmp[3];
 	ssize_t len;
 
@@ -128,6 +128,7 @@ int misc_init_r(void)
 			tmp[2] = '\0';
 			mac_addr[i] = hextoul(tmp, NULL);
 		}
+		mac_addr[MAC_ADDR_LEN] = '\0';
 
 		if (is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr("ethaddr", mac_addr);
diff --git a/board/amlogic/p200/p200.c b/board/amlogic/p200/p200.c
index 3061f7a..754242e 100644
--- a/board/amlogic/p200/p200.c
+++ b/board/amlogic/p200/p200.c
@@ -21,13 +21,14 @@
 
 int misc_init_r(void)
 {
-	u8 mac_addr[EFUSE_MAC_SIZE];
-	char serial[EFUSE_SN_SIZE];
+	u8 mac_addr[EFUSE_MAC_SIZE + 1];
+	char serial[EFUSE_SN_SIZE + 1];
 	ssize_t len;
 
 	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
 		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
 					  mac_addr, EFUSE_MAC_SIZE);
+		mac_addr[len] = '\0';
 		if (len == EFUSE_MAC_SIZE && is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr("ethaddr", mac_addr);
 		else
@@ -37,6 +38,7 @@ int misc_init_r(void)
 	if (!env_get("serial#")) {
 		len = meson_sm_read_efuse(EFUSE_SN_OFFSET, serial,
 			EFUSE_SN_SIZE);
+		serial[len] = '\0';
 		if (len == EFUSE_SN_SIZE)
 			env_set("serial#", serial);
 	}
diff --git a/board/amlogic/p201/p201.c b/board/amlogic/p201/p201.c
index 7c432f9..769e273 100644
--- a/board/amlogic/p201/p201.c
+++ b/board/amlogic/p201/p201.c
@@ -21,13 +21,14 @@
 
 int misc_init_r(void)
 {
-	u8 mac_addr[EFUSE_MAC_SIZE];
-	char serial[EFUSE_SN_SIZE];
+	u8 mac_addr[EFUSE_MAC_SIZE + 1];
+	char serial[EFUSE_SN_SIZE + 1];
 	ssize_t len;
 
 	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
 		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
 					  mac_addr, EFUSE_MAC_SIZE);
+		mac_addr[len] = '\0';
 		if (len == EFUSE_MAC_SIZE && is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr("ethaddr", mac_addr);
 	}
@@ -35,6 +36,7 @@ int misc_init_r(void)
 	if (!env_get("serial#")) {
 		len = meson_sm_read_efuse(EFUSE_SN_OFFSET, serial,
 			EFUSE_SN_SIZE);
+		serial[len] = '\0';
 		if (len == EFUSE_SN_SIZE)
 			env_set("serial#", serial);
 	}
diff --git a/board/amlogic/p212/p212.c b/board/amlogic/p212/p212.c
index fcef90b..f6e60ae 100644
--- a/board/amlogic/p212/p212.c
+++ b/board/amlogic/p212/p212.c
@@ -22,13 +22,14 @@
 
 int misc_init_r(void)
 {
-	u8 mac_addr[EFUSE_MAC_SIZE];
-	char serial[EFUSE_SN_SIZE];
+	u8 mac_addr[EFUSE_MAC_SIZE + 1];
+	char serial[EFUSE_SN_SIZE + 1];
 	ssize_t len;
 
 	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
 		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
 					  mac_addr, EFUSE_MAC_SIZE);
+		mac_addr[len] = '\0';
 		if (len == EFUSE_MAC_SIZE && is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr("ethaddr", mac_addr);
 		else
@@ -38,6 +39,7 @@ int misc_init_r(void)
 	if (!env_get("serial#")) {
 		len = meson_sm_read_efuse(EFUSE_SN_OFFSET, serial,
 			EFUSE_SN_SIZE);
+		serial[len] = '\0';
 		if (len == EFUSE_SN_SIZE)
 			env_set("serial#", serial);
 	}
diff --git a/board/amlogic/q200/q200.c b/board/amlogic/q200/q200.c
index 3aa6d8f..47f1566 100644
--- a/board/amlogic/q200/q200.c
+++ b/board/amlogic/q200/q200.c
@@ -22,13 +22,14 @@
 
 int misc_init_r(void)
 {
-	u8 mac_addr[EFUSE_MAC_SIZE];
-	char serial[EFUSE_SN_SIZE];
+	u8 mac_addr[EFUSE_MAC_SIZE + 1];
+	char serial[EFUSE_SN_SIZE + 1];
 	ssize_t len;
 
 	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
 		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
 					  mac_addr, EFUSE_MAC_SIZE);
+		mac_addr[len] = '\0';
 		if (len == EFUSE_MAC_SIZE && is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr("ethaddr", mac_addr);
 		else
@@ -38,6 +39,7 @@ int misc_init_r(void)
 	if (!env_get("serial#")) {
 		len = meson_sm_read_efuse(EFUSE_SN_OFFSET, serial,
 					  EFUSE_SN_SIZE);
+		serial[len] = '\0';
 		if (len == EFUSE_SN_SIZE)
 			env_set("serial#", serial);
 	}
diff --git a/board/amlogic/vim3/vim3.c b/board/amlogic/vim3/vim3.c
index 8bdfb30..43d7a8e 100644
--- a/board/amlogic/vim3/vim3.c
+++ b/board/amlogic/vim3/vim3.c
@@ -151,7 +151,7 @@ int meson_ft_board_setup(void *blob, struct bd_info *bd)
 
 int misc_init_r(void)
 {
-	u8 mac_addr[MAC_ADDR_LEN];
+	u8 mac_addr[MAC_ADDR_LEN + 1];
 	char efuse_mac_addr[EFUSE_MAC_SIZE], tmp[3];
 	char serial_string[EFUSE_MAC_SIZE + 1];
 	ssize_t len;
@@ -169,6 +169,7 @@ int misc_init_r(void)
 			tmp[2] = '\0';
 			mac_addr[i] = hextoul(tmp, NULL);
 		}
+		mac_addr[MAC_ADDR_LEN] = '\0';
 
 		if (is_valid_ethaddr(mac_addr))
 			eth_env_set_enetaddr("ethaddr", mac_addr);