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Justin Stitt authored
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 these fields to be NUL-terminated as the property names from which they are derived are also NUL-terminated. Moreover, NUL-padding is not required as our destination buffers are already NUL-allocated and any future NUL-byte assignments are redundant (like the ones that strncpy() does). ibmvfc_probe() -> | struct ibmvfc_host *vhost; | struct Scsi_Host *shost; ... | shost = scsi_host_alloc(&driver_template, sizeof(*vhost)); ... **side note: is this a bug? Looks like a type to me ^^^^^** ... | vhost = shost_priv(shost); ... where shost_priv() is: | static inline void *shost_priv(struct Scsi_Host *shost) | { | return (void *)shost->hostdata; | } .. and: scsi_host_alloc() -> | shost = kzalloc(sizeof(struct Scsi_Host) + privsize, GFP_KERNEL); And for login_info->..., NUL-padding is also not required as it is explicitly memset to 0: | memset(login_info, 0, sizeof(*login_info)); 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> Link: https://lore.kernel.org/r/20231030-strncpy-drivers-scsi-ibmvscsi-ibmvfc-c-v1-1-5a4909688435@google.comReviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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