Convert sprintf calls to snprintf in order to make possible buffer
overflow more obvious.
Signed-off-by: Javier González <[email protected]>
---
drivers/lightnvm/core.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index c3340ef..bdbb333 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -272,7 +272,8 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
goto err_disk;
blk_queue_make_request(tqueue, tt->make_rq);
- sprintf(tdisk->disk_name, "%s", create->tgtname);
+ snprintf(tdisk->disk_name, sizeof(tdisk->disk_name), "%s",
+ create->tgtname);
tdisk->flags = GENHD_FL_EXT_DEVT;
tdisk->major = 0;
tdisk->first_minor = 0;
@@ -1195,13 +1196,13 @@ static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
list_for_each_entry(dev, &nvm_devices, devices) {
struct nvm_ioctl_device_info *info = &devices->info[i];
- sprintf(info->devname, "%s", dev->name);
+ snprintf(info->devname, sizeof(info->devname), "%s", dev->name);
/* kept for compatibility */
info->bmversion[0] = 1;
info->bmversion[1] = 0;
info->bmversion[2] = 0;
- sprintf(info->bmname, "%s", "gennvm");
+ snprintf(info->bmname, sizeof(info->bmname), "%s", "gennvm");
i++;
if (i > 31) {
--
2.7.4
Prefix the nvm_free static function with a missing static keyword.
Signed-off-by: Javier González <[email protected]>
---
drivers/lightnvm/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index bdbb333..3e51a05 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -999,7 +999,7 @@ static int nvm_core_init(struct nvm_dev *dev)
return ret;
}
-void nvm_free(struct nvm_dev *dev)
+static void nvm_free(struct nvm_dev *dev)
{
if (!dev)
return;
--
2.7.4
On Mon, 2017-04-10 at 20:51 +0200, Javier Gonz?lez wrote:
> Convert sprintf calls to snprintf in order to make possible buffer
> overflow more obvious.
>
> Signed-off-by: Javier Gonz?lez <[email protected]>
> ---
> drivers/lightnvm/core.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index c3340ef..bdbb333 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -272,7 +272,8 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
> goto err_disk;
> blk_queue_make_request(tqueue, tt->make_rq);
>
> - sprintf(tdisk->disk_name, "%s", create->tgtname);
> + snprintf(tdisk->disk_name, sizeof(tdisk->disk_name), "%s",
> + create->tgtname);
> tdisk->flags = GENHD_FL_EXT_DEVT;
> tdisk->major = 0;
> tdisk->first_minor = 0;
> @@ -1195,13 +1196,13 @@ static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
> list_for_each_entry(dev, &nvm_devices, devices) {
> struct nvm_ioctl_device_info *info = &devices->info[i];
>
> - sprintf(info->devname, "%s", dev->name);
> + snprintf(info->devname, sizeof(info->devname), "%s", dev->name);
>
> /* kept for compatibility */
> info->bmversion[0] = 1;
> info->bmversion[1] = 0;
> info->bmversion[2] = 0;
> - sprintf(info->bmname, "%s", "gennvm");
> + snprintf(info->bmname, sizeof(info->bmname), "%s", "gennvm");
> i++;
>
> if (i > 31) {
Hello Javier,
Although the above changes look fine to me, have you considered to use strlcpy()
instead of snprintf() for these string copy operations?
Bart.
> On 10 Apr 2017, at 20.56, Bart Van Assche <[email protected]> wrote:
>
> On Mon, 2017-04-10 at 20:51 +0200, Javier González wrote:
>> Convert sprintf calls to snprintf in order to make possible buffer
>> overflow more obvious.
>>
>> Signed-off-by: Javier González <[email protected]>
>> ---
>> drivers/lightnvm/core.c | 7 ++++---
>> 1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
>> index c3340ef..bdbb333 100644
>> --- a/drivers/lightnvm/core.c
>> +++ b/drivers/lightnvm/core.c
>> @@ -272,7 +272,8 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
>> goto err_disk;
>> blk_queue_make_request(tqueue, tt->make_rq);
>>
>> - sprintf(tdisk->disk_name, "%s", create->tgtname);
>> + snprintf(tdisk->disk_name, sizeof(tdisk->disk_name), "%s",
>> + create->tgtname);
>> tdisk->flags = GENHD_FL_EXT_DEVT;
>> tdisk->major = 0;
>> tdisk->first_minor = 0;
>> @@ -1195,13 +1196,13 @@ static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
>> list_for_each_entry(dev, &nvm_devices, devices) {
>> struct nvm_ioctl_device_info *info = &devices->info[i];
>>
>> - sprintf(info->devname, "%s", dev->name);
>> + snprintf(info->devname, sizeof(info->devname), "%s", dev->name);
>>
>> /* kept for compatibility */
>> info->bmversion[0] = 1;
>> info->bmversion[1] = 0;
>> info->bmversion[2] = 0;
>> - sprintf(info->bmname, "%s", "gennvm");
>> + snprintf(info->bmname, sizeof(info->bmname), "%s", "gennvm");
>> i++;
>>
>> if (i > 31) {
>
> Hello Javier,
>
> Although the above changes look fine to me, have you considered to use strlcpy()
> instead of snprintf() for these string copy operations?
You're right. It is a better way of doing it.
Thanks!
>
> Bart.
Javier
On 04/10/2017 08:51 PM, Javier González wrote:
> Prefix the nvm_free static function with a missing static keyword.
>
> Signed-off-by: Javier González <[email protected]>
> ---
> drivers/lightnvm/core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index bdbb333..3e51a05 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -999,7 +999,7 @@ static int nvm_core_init(struct nvm_dev *dev)
> return ret;
> }
>
> -void nvm_free(struct nvm_dev *dev)
> +static void nvm_free(struct nvm_dev *dev)
> {
> if (!dev)
> return;
>
Thanks. Applied for 4.12.