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Message-ID: <20230927-strncpy-drivers-misc-ibmvmc-c-v1-1-29f56cd3a269@google.com> Date: Wed, 27 Sep 2023 05:52:14 +0000 From: Justin Stitt <justinstitt@...gle.com> To: Brad Warrum <bwarrum@...ux.ibm.com>, Ritu Agarwal <rituagar@...ux.ibm.com>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, Justin Stitt <justinstitt@...gle.com> Subject: [PATCH] ibmvmc: replace deprecated strncpy with strscpy `strncpy` is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. 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@...r.kernel.org Signed-off-by: Justin Stitt <justinstitt@...gle.com> --- Note: build-tested only. --- drivers/misc/ibmvmc.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/misc/ibmvmc.c b/drivers/misc/ibmvmc.c index 2101eb12bcba..6d9ed9325f9f 100644 --- a/drivers/misc/ibmvmc.c +++ b/drivers/misc/ibmvmc.c @@ -1249,9 +1249,7 @@ static long ibmvmc_ioctl_sethmcid(struct ibmvmc_file_session *session, return -EIO; } - /* Make sure buffer is NULL terminated before trying to print it */ - memset(print_buffer, 0, HMC_ID_LEN + 1); - strncpy(print_buffer, hmc->hmc_id, HMC_ID_LEN); + strscpy(print_buffer, hmc->hmc_id, sizeof(print_buffer)); pr_info("ibmvmc: sethmcid: Set HMC ID: \"%s\"\n", print_buffer); memcpy(buffer->real_addr_local, hmc->hmc_id, HMC_ID_LEN); --- base-commit: 6465e260f48790807eef06b583b38ca9789b6072 change-id: 20230927-strncpy-drivers-misc-ibmvmc-c-534349716fa4 Best regards, -- Justin Stitt <justinstitt@...gle.com>
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