diff mbox series

i2c: replace deprecated strncpy

Message ID 20230920-strncpy-drivers-i2c-busses-i2c-powermac-c-v1-1-0a3e9a107f8a@google.com (mailing list archive)
State Mainlined
Commit 65917718fb8bc2c94df3d52c054116c0e2e640cc
Headers show
Series i2c: replace deprecated strncpy | expand

Commit Message

Justin Stitt Sept. 20, 2023, 11:07 a.m. UTC
`strncpy` is deprecated for use on NUL-terminated destination strings [1].

We should prefer more robust and less ambiguous string interfaces.

`info.type` is expected to be NUL-terminated judging by its use in
`i2c_new_client_device()` wherein it is used to populate `client->name`:
|	strscpy(client->name, info->type, sizeof(client->name));

NUL-padding is not required and even if it was, `client` is already
zero-initialized.

Considering the two points from above, a suitable replacement is
`strscpy` [2] due to the fact that it guarantees NUL-termination on the
destination buffer without unnecessarily NUL-padding.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
---
 drivers/i2c/busses/i2c-powermac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


---
base-commit: 2cf0f715623872823a72e451243bbf555d10d032
change-id: 20230920-strncpy-drivers-i2c-busses-i2c-powermac-c-a95017b69711

Best regards,
--
Justin Stitt <justinstitt@google.com>

Comments

Kees Cook Sept. 20, 2023, 2:33 p.m. UTC | #1
On Wed, Sep 20, 2023 at 11:07:35AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> 
> We should prefer more robust and less ambiguous string interfaces.
> 
> `info.type` is expected to be NUL-terminated judging by its use in
> `i2c_new_client_device()` wherein it is used to populate `client->name`:
> |	strscpy(client->name, info->type, sizeof(client->name));
> 
> NUL-padding is not required and even if it was, `client` is already
> zero-initialized.
> 
> Considering the two points from above, a suitable replacement is
> `strscpy` [2] due to the fact that it guarantees NUL-termination on the
> destination buffer without unnecessarily NUL-padding.
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@vger.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@google.com>

Looks like a straight replacement. Thanks!

Reviewed-by: Kees Cook <keescook@chromium.org>
Wolfram Sang Sept. 22, 2023, 10:12 a.m. UTC | #2
On Wed, Sep 20, 2023 at 11:07:35AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> 
> We should prefer more robust and less ambiguous string interfaces.
> 
> `info.type` is expected to be NUL-terminated judging by its use in
> `i2c_new_client_device()` wherein it is used to populate `client->name`:
> |	strscpy(client->name, info->type, sizeof(client->name));
> 
> NUL-padding is not required and even if it was, `client` is already
> zero-initialized.
> 
> Considering the two points from above, a suitable replacement is
> `strscpy` [2] due to the fact that it guarantees NUL-termination on the
> destination buffer without unnecessarily NUL-padding.
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@vger.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@google.com>

Added "powermac: " to $subject and applied to for-next, thanks!
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c
index 4996a628fdae..8e57ebe595be 100644
--- a/drivers/i2c/busses/i2c-powermac.c
+++ b/drivers/i2c/busses/i2c-powermac.c
@@ -231,7 +231,7 @@  static void i2c_powermac_create_one(struct i2c_adapter *adap,
 	struct i2c_board_info info = {};
 	struct i2c_client *newdev;
 
-	strncpy(info.type, type, sizeof(info.type));
+	strscpy(info.type, type, sizeof(info.type));
 	info.addr = addr;
 	newdev = i2c_new_client_device(adap, &info);
 	if (IS_ERR(newdev))