| Message ID | 20230823-strncpy-drivers-accel-habanalabs-common-habanalabs_drv-v1-1-147656947586@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | accel/habanalabs: refactor deprecated strncpy | expand |
On Wed, Aug 23, 2023 at 12:23:08AM +0000, Justin Stitt wrote: > `strncpy` is deprecated for use on NUL-terminated destination strings [1]. > > A suitable replacement is `strscpy` [2] due to the fact that it > guarantees NUL-termination on its destination buffer argument which is > _not_ the case for `strncpy`! > > There is likely no bug happening in this case since HL_STR_MAX is > strictly larger than all source strings. Nonetheless, prefer a safer and > more robust interface. > > It should also be noted that `strscpy` will not pad like `strncpy`. If > this NUL-padding behavior is _required_ we should use `strscpy_pad` > instead of `strscpy`. > > Link: 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> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
On Fri, Aug 25, 2023 at 12:19 PM Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> wrote: > > On Wed, Aug 23, 2023 at 12:23:08AM +0000, Justin Stitt wrote: > > `strncpy` is deprecated for use on NUL-terminated destination strings [1]. > > > > A suitable replacement is `strscpy` [2] due to the fact that it > > guarantees NUL-termination on its destination buffer argument which is > > _not_ the case for `strncpy`! > > > > There is likely no bug happening in this case since HL_STR_MAX is > > strictly larger than all source strings. Nonetheless, prefer a safer and > > more robust interface. > > > > It should also be noted that `strscpy` will not pad like `strncpy`. If > > this NUL-padding behavior is _required_ we should use `strscpy_pad` > > instead of `strscpy`. > > > > Link: 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> > Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> > Applied to -next Thanks, Oded
diff --git a/drivers/accel/habanalabs/common/habanalabs_drv.c b/drivers/accel/habanalabs/common/habanalabs_drv.c index 7263e84c1a4d..d9a3418b5ae4 100644 --- a/drivers/accel/habanalabs/common/habanalabs_drv.c +++ b/drivers/accel/habanalabs/common/habanalabs_drv.c @@ -408,13 +408,13 @@ static int create_hdev(struct hl_device **dev, struct pci_dev *pdev) hdev->pdev = pdev; /* Assign status description string */ - strncpy(hdev->status[HL_DEVICE_STATUS_OPERATIONAL], "operational", HL_STR_MAX); - strncpy(hdev->status[HL_DEVICE_STATUS_IN_RESET], "in reset", HL_STR_MAX); - strncpy(hdev->status[HL_DEVICE_STATUS_MALFUNCTION], "disabled", HL_STR_MAX); - strncpy(hdev->status[HL_DEVICE_STATUS_NEEDS_RESET], "needs reset", HL_STR_MAX); - strncpy(hdev->status[HL_DEVICE_STATUS_IN_DEVICE_CREATION], - "in device creation", HL_STR_MAX); - strncpy(hdev->status[HL_DEVICE_STATUS_IN_RESET_AFTER_DEVICE_RELEASE], + strscpy(hdev->status[HL_DEVICE_STATUS_OPERATIONAL], "operational", HL_STR_MAX); + strscpy(hdev->status[HL_DEVICE_STATUS_IN_RESET], "in reset", HL_STR_MAX); + strscpy(hdev->status[HL_DEVICE_STATUS_MALFUNCTION], "disabled", HL_STR_MAX); + strscpy(hdev->status[HL_DEVICE_STATUS_NEEDS_RESET], "needs reset", HL_STR_MAX); + strscpy(hdev->status[HL_DEVICE_STATUS_IN_DEVICE_CREATION], + "in device creation", HL_STR_MAX); + strscpy(hdev->status[HL_DEVICE_STATUS_IN_RESET_AFTER_DEVICE_RELEASE], "in reset after device release", HL_STR_MAX);
`strncpy` is deprecated for use on NUL-terminated destination strings [1]. A suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on its destination buffer argument which is _not_ the case for `strncpy`! There is likely no bug happening in this case since HL_STR_MAX is strictly larger than all source strings. Nonetheless, prefer a safer and more robust interface. It should also be noted that `strscpy` will not pad like `strncpy`. If this NUL-padding behavior is _required_ we should use `strscpy_pad` instead of `strscpy`. Link: 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> --- Note: build-tested only. --- drivers/accel/habanalabs/common/habanalabs_drv.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) --- base-commit: 706a741595047797872e669b3101429ab8d378ef change-id: 20230823-strncpy-drivers-accel-habanalabs-common-habanalabs_drv-7ffecf6882ed Best regards, -- Justin Stitt <justinstitt@google.com>