From: Nicolas Iooss <nicolas.iooss+ub...@ledger.fr>
When running "i2c md 0 0 80000100", the function do_i2c_md parses the
length into an unsigned int variable named length. The value is then
moved to a signed variable:
int nbytes = length;
#define DISP_LINE_LEN 16
int linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;
ret = dm_i2c_read(dev, addr, linebuf, linebytes);
On systems where integers are 32 bits wide, 0x80000100 is a negative
value to "nbytes > DISP_LINE_LEN" is false and linebytes gets assigned
0x80000100 instead of 16.
The consequence is that the function which reads from the i2c device
(dm_i2c_read or i2c_read) is called with a 16-byte stack buffer to fill
but with a size parameter which is too large. In some cases, this could
trigger a crash. But with some i2c drivers, such as drivers/i2c/nx_i2c.c
(used with "nexell,s5pxx18-i2c" bus), the size is actually truncated to
a 16-bit integer. This is because function i2c_transfer expects an
unsigned short length. In such a case, an attacker who can control the
response of an i2c device can overwrite the return address of a function
and execute arbitrary code through Return-Oriented Programming.
Fix this issue by using unsigned integers types in do_i2c_md. While at
it, make also alen unsigned, as signed sizes can cause vulnerabilities
when people forgot to check that they can be negative.
Signed-off-by: Nicolas Iooss <nicolas.iooss+ub...@ledger.fr>
---
cmd/i2c.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/cmd/i2c.c b/cmd/i2c.c
index 9050b2b8d27a..bd04b14024be 100644
--- a/cmd/i2c.c
+++ b/cmd/i2c.c
@@ -200,10 +200,10 @@ void i2c_init_board(void)
*
* Returns the address length.
*/
-static uint get_alen(char *arg, int default_len)
+static uint get_alen(char *arg, uint default_len)
{
- int j;
- int alen;
+ uint j;
+ uint alen;
alen = default_len;
for (j = 0; j < 8; j++) {
@@ -247,7 +247,7 @@ static int do_i2c_read(struct cmd_tbl *cmdtp, int flag, int
argc,
{
uint chip;
uint devaddr, length;
- int alen;
+ uint alen;
u_char *memaddr;
int ret;
#if CONFIG_IS_ENABLED(DM_I2C)
@@ -301,7 +301,7 @@ static int do_i2c_write(struct cmd_tbl *cmdtp, int flag,
int argc,
{
uint chip;
uint devaddr, length;
- int alen;
+ uint alen;
u_char *memaddr;
int ret;
#if CONFIG_IS_ENABLED(DM_I2C)
@@ -469,8 +469,8 @@ static int do_i2c_md(struct cmd_tbl *cmdtp, int flag, int
argc,
{
uint chip;
uint addr, length;
- int alen;
- int j, nbytes, linebytes;
+ uint alen;
+ uint j, nbytes, linebytes;
int ret;
#if CONFIG_IS_ENABLED(DM_I2C)
struct udevice *dev;
@@ -589,9 +589,9 @@ static int do_i2c_mw(struct cmd_tbl *cmdtp, int flag, int
argc,
{
uint chip;
ulong addr;
- int alen;
+ uint alen;
uchar byte;
- int count;
+ uint count;
int ret;
#if CONFIG_IS_ENABLED(DM_I2C)
struct udevice *dev;
@@ -676,8 +676,8 @@ static int do_i2c_crc(struct cmd_tbl *cmdtp, int flag, int
argc,
{
uint chip;
ulong addr;
- int alen;
- int count;
+ uint alen;
+ uint count;
uchar byte;
ulong crc;
ulong err;
@@ -985,7 +985,7 @@ static int do_i2c_loop(struct cmd_tbl *cmdtp, int flag, int
argc,
char *const argv[])
{
uint chip;
- int alen;
+ uint alen;
uint addr;
uint length;
u_char bytes[16];
--
2.32.0
