In preparation to enabling -Wvla, remove VLA and replace it
with a fixed-length array instead.
From a security viewpoint, the use of Variable Length Arrays can be
a vector for stack overflow attacks. Also, in general, as the code
evolves it is easy to lose track of how big a VLA can get. Thus, we
can end up having segfaults that are hard to debug.
Also, fixed as part of the directive to remove all VLAs from
the kernel: https://lkml.org/lkml/2018/3/7/621
Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
Changes in v2:
- Update changelog as per Alexandre Belloni request.
- Update the code for rtc-bq32k driver based on Alexandre's feedback.
drivers/rtc/rtc-bq32k.c | 6 +++++-
drivers/rtc/rtc-mcp795.c | 2 +-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/rtc/rtc-bq32k.c b/drivers/rtc/rtc-bq32k.c
index e8698e9..ef52741 100644
--- a/drivers/rtc/rtc-bq32k.c
+++ b/drivers/rtc/rtc-bq32k.c
@@ -36,6 +36,10 @@
#define BQ32K_CFG2 0x09 /* Trickle charger control */
#define BQ32K_TCFE BIT(6) /* Trickle charge FET bypass */
+#define MAX_LEN 10 /* Maximum number of consecutive
+ * register for this particular RTC.
+ */
+
struct bq32k_regs {
uint8_t seconds;
uint8_t minutes;
@@ -74,7 +78,7 @@ static int bq32k_read(struct device *dev, void *data, uint8_t off, uint8_t len)
static int bq32k_write(struct device *dev, void *data, uint8_t off, uint8_t len)
{
struct i2c_client *client = to_i2c_client(dev);
- uint8_t buffer[len + 1];
+ uint8_t buffer[MAX_LEN + 1];
buffer[0] = off;
memcpy(&buffer[1], data, len);
diff --git a/drivers/rtc/rtc-mcp795.c b/drivers/rtc/rtc-mcp795.c
index 79e24ea..00e11c1 100644
--- a/drivers/rtc/rtc-mcp795.c
+++ b/drivers/rtc/rtc-mcp795.c
@@ -82,7 +82,7 @@ static int mcp795_rtcc_write(struct device *dev, u8 addr, u8 *data, u8 count)
{
struct spi_device *spi = to_spi_device(dev);
int ret;
- u8 tx[2 + count];
+ u8 tx[257];
tx[0] = MCP795_WRITE;
tx[1] = addr;
--
2.7.4
On 07/03/2018 at 20:27:56 -0600, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wvla, remove VLA and replace it
> with a fixed-length array instead.
>
> From a security viewpoint, the use of Variable Length Arrays can be
> a vector for stack overflow attacks. Also, in general, as the code
> evolves it is easy to lose track of how big a VLA can get. Thus, we
> can end up having segfaults that are hard to debug.
>
> Also, fixed as part of the directive to remove all VLAs from
> the kernel: https://lkml.org/lkml/2018/3/7/621
>
That is a good description, thanks
> Signed-off-by: Gustavo A. R. Silva <[email protected]>
> ---
> Changes in v2:
> - Update changelog as per Alexandre Belloni request.
> - Update the code for rtc-bq32k driver based on Alexandre's feedback.
>
> drivers/rtc/rtc-bq32k.c | 6 +++++-
> drivers/rtc/rtc-mcp795.c | 2 +-
> 2 files changed, 6 insertions(+), 2 deletions(-)
>
Applied.
--
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com