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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Kees Cook , Justin Stitt 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,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 morse.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (morse.vger.email [0.0.0.0]); Thu, 12 Oct 2023 11:36:05 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1779575834716579443 X-GMAIL-MSGID: 1779575834716579443 strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. This patch eliminates three uses of strncpy(): Firstly, `dest` is expected to be NUL-terminated which is evident by the manual setting of a NUL-byte at size - 1. For this use specifically, strscpy() is a viable replacement due to the fact that it guarantees NUL-termination on the destination buffer. The next two cases should simply be memcpy() as the size of the src string is always 3 and the destination string just wants the first 3 bytes changed. To be clear, there are no buffer overread bugs in the current code as the sizes and offsets are carefully managed such that buffers are NUL-terminated. However, with these changes, the code is now more robust and less ambiguous (and hopefully easier to read). 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 Cc: Kees Cook Signed-off-by: Justin Stitt Reviewed-by: Kees Cook --- Changes in v2: - prefer memcpy to snprintf (thanks Kees) - Link to v1: https://lore.kernel.org/r/20231011-strncpy-drivers-net-ethernet-qlogic-qed-qed_debug-c-v1-1-60c9ca2d54a2@google.com --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/net/ethernet/qlogic/qed/qed_debug.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2 change-id: 20231011-strncpy-drivers-net-ethernet-qlogic-qed-qed_debug-c-211d594201e4 Best regards, -- Justin Stitt diff --git a/drivers/net/ethernet/qlogic/qed/qed_debug.c b/drivers/net/ethernet/qlogic/qed/qed_debug.c index cdcead614e9f..f67be4b8ad43 100644 --- a/drivers/net/ethernet/qlogic/qed/qed_debug.c +++ b/drivers/net/ethernet/qlogic/qed/qed_debug.c @@ -3204,8 +3204,8 @@ static u32 qed_grc_dump_big_ram(struct qed_hwfn *p_hwfn, BIT(big_ram->is_256b_bit_offset[dev_data->chip_id]) ? 256 : 128; - strncpy(type_name, big_ram->instance_name, BIG_RAM_NAME_LEN); - strncpy(mem_name, big_ram->instance_name, BIG_RAM_NAME_LEN); + memcpy(type_name, big_ram->instance_name, BIG_RAM_NAME_LEN); + memcpy(mem_name, big_ram->instance_name, BIG_RAM_NAME_LEN); /* Dump memory header */ offset += qed_grc_dump_mem_hdr(p_hwfn, @@ -6359,8 +6359,7 @@ static void qed_read_str_from_buf(void *buf, u32 *offset, u32 size, char *dest) { const char *source_str = &((const char *)buf)[*offset]; - strncpy(dest, source_str, size); - dest[size - 1] = '\0'; + strscpy(dest, source_str, size); *offset += size; }