Message ID | 20231207-strncpy-drivers-net-ethernet-qlogic-qlcnic-qlcnic_83xx_init-c-v2-1-eb1a20a91b2a@google.com |
---|---|
State | New |
Headers |
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Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com> Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt <justinstitt@google.com> Content-Type: text/plain; charset="utf-8" X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE, USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on howler.vger.email Precedence: bulk List-ID: <linux-kernel.vger.kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Thu, 07 Dec 2023 13:42:32 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784660997593000842 X-GMAIL-MSGID: 1784660997593000842 |
Series |
[v2] qlcnic: replace deprecated strncpy with strscpy
|
|
Commit Message
Justin Stitt
Dec. 7, 2023, 9:42 p.m. UTC
strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.
We expect fw_info->fw_file_name to be NUL-terminated based on its use
within _request_firmware_prepare() wherein `name` refers to it:
| if (firmware_request_builtin_buf(firmware, name, dbuf, size)) {
| dev_dbg(device, "using built-in %s\n", name);
| return 0; /* assigned */
| }
... and with firmware_request_builtin() also via `name`:
| if (strcmp(name, b_fw->name) == 0) {
There is no evidence that NUL-padding is required.
Additionally replace size macro (QLC_FW_FILE_NAME_LEN) with
sizeof(fw_info->fw_file_name) to more directly tie the maximum buffer
size to the destination buffer:
Considering the 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>
---
Changes in v2:
- update commit msg with sizeof() rationale (thanks Kees)
- rebase onto mainline bee0e7762ad2c602
- Link to v1: https://lore.kernel.org/r/20231012-strncpy-drivers-net-ethernet-qlogic-qlcnic-qlcnic_83xx_init-c-v1-1-f0008d5e43be@google.com
---
Note: build-tested only.
Found with: $ rg "strncpy\("
---
drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
---
base-commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8
change-id: 20231012-strncpy-drivers-net-ethernet-qlogic-qlcnic-qlcnic_83xx_init-c-7858019dc583
Best regards,
--
Justin Stitt <justinstitt@google.com>
Comments
On Thu, Dec 07, 2023 at 09:42:22PM +0000, Justin Stitt wrote: > strncpy() is deprecated for use on NUL-terminated destination strings > [1] and as such we should prefer more robust and less ambiguous string > interfaces. > > We expect fw_info->fw_file_name to be NUL-terminated based on its use > within _request_firmware_prepare() wherein `name` refers to it: > | if (firmware_request_builtin_buf(firmware, name, dbuf, size)) { > | dev_dbg(device, "using built-in %s\n", name); > | return 0; /* assigned */ > | } > ... and with firmware_request_builtin() also via `name`: > | if (strcmp(name, b_fw->name) == 0) { > > There is no evidence that NUL-padding is required. > > Additionally replace size macro (QLC_FW_FILE_NAME_LEN) with > sizeof(fw_info->fw_file_name) to more directly tie the maximum buffer > size to the destination buffer: > > Considering the 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> Thanks for the refresh! Reviewed-by: Kees Cook <keescook@chromium.org>
Hello: This patch was applied to netdev/net-next.git (main) by David S. Miller <davem@davemloft.net>: On Thu, 07 Dec 2023 21:42:22 +0000 you wrote: > strncpy() is deprecated for use on NUL-terminated destination strings > [1] and as such we should prefer more robust and less ambiguous string > interfaces. > > We expect fw_info->fw_file_name to be NUL-terminated based on its use > within _request_firmware_prepare() wherein `name` refers to it: > | if (firmware_request_builtin_buf(firmware, name, dbuf, size)) { > | dev_dbg(device, "using built-in %s\n", name); > | return 0; /* assigned */ > | } > ... and with firmware_request_builtin() also via `name`: > | if (strcmp(name, b_fw->name) == 0) { > > [...] Here is the summary with links: - [v2] qlcnic: replace deprecated strncpy with strscpy https://git.kernel.org/netdev/net-next/c/f8dd2412ba66 You are awesome, thank you!
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c index c95d56e56c59..b733374b4dc5 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c @@ -2092,8 +2092,8 @@ static int qlcnic_83xx_run_post(struct qlcnic_adapter *adapter) return -EINVAL; } - strncpy(fw_info->fw_file_name, QLC_83XX_POST_FW_FILE_NAME, - QLC_FW_FILE_NAME_LEN); + strscpy(fw_info->fw_file_name, QLC_83XX_POST_FW_FILE_NAME, + sizeof(fw_info->fw_file_name)); ret = request_firmware(&fw_info->fw, fw_info->fw_file_name, dev); if (ret) { @@ -2396,12 +2396,12 @@ static int qlcnic_83xx_get_fw_info(struct qlcnic_adapter *adapter) switch (pdev->device) { case PCI_DEVICE_ID_QLOGIC_QLE834X: case PCI_DEVICE_ID_QLOGIC_QLE8830: - strncpy(fw_info->fw_file_name, QLC_83XX_FW_FILE_NAME, - QLC_FW_FILE_NAME_LEN); + strscpy(fw_info->fw_file_name, QLC_83XX_FW_FILE_NAME, + sizeof(fw_info->fw_file_name)); break; case PCI_DEVICE_ID_QLOGIC_QLE844X: - strncpy(fw_info->fw_file_name, QLC_84XX_FW_FILE_NAME, - QLC_FW_FILE_NAME_LEN); + strscpy(fw_info->fw_file_name, QLC_84XX_FW_FILE_NAME, + sizeof(fw_info->fw_file_name)); break; default: dev_err(&pdev->dev, "%s: Invalid device id\n",