strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. @query is already marked as __nonstring and doesn't need to be NUL-terminated. Due to this, we don't need to use a string API here (especially a deprecated one). Let's have our stack allocation also zero-initialize so that we can just perform a standard memcpy. Since the code now speaks for itself we can drop the comment. A memcpy on a __nonstring buffer explains everything that this comment talks about. 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@xxxxxxxxxxxxxxx Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx> --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/soc/qcom/cmd-db.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c index a5fd68411bed..512556366a3e 100644 --- a/drivers/soc/qcom/cmd-db.c +++ b/drivers/soc/qcom/cmd-db.c @@ -141,18 +141,13 @@ static int cmd_db_get_header(const char *id, const struct entry_header **eh, const struct rsc_hdr *rsc_hdr; const struct entry_header *ent; int ret, i, j; - u8 query[sizeof(ent->id)] __nonstring; + u8 query[sizeof(ent->id)] __nonstring = { 0 }; ret = cmd_db_ready(); if (ret) return ret; - /* - * Pad out query string to same length as in DB. NOTE: the output - * query string is not necessarily '\0' terminated if it bumps up - * against the max size. That's OK and expected. - */ - strncpy(query, id, sizeof(query)); + memcpy(query, id, sizeof(query)); for (i = 0; i < MAX_SLV_ID; i++) { rsc_hdr = &cmd_db_header->header[i]; --- base-commit: fe46a7dd189e25604716c03576d05ac8a5209743 change-id: 20240314-strncpy-drivers-soc-qcom-cmd-db-c-284f3abaabb8 Best regards, -- Justin Stitt <justinstitt@xxxxxxxxxx>
