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Fri, 11 Aug 2023 14:19:26 -0700 (PDT) Date: Fri, 11 Aug 2023 21:19:19 +0000 In-Reply-To: <20230811-strncpy-arch-powerpc-platforms-ps3-v1-0-301052a5663e@google.com> Mime-Version: 1.0 References: <20230811-strncpy-arch-powerpc-platforms-ps3-v1-0-301052a5663e@google.com> X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1691788764; l=878; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=rykhGlCJgq/28Gofw5R06xkjvMhLluFR9H0cPPJUQmM=; b=dqa+uC3ZSEDoM05puhWT3wolaXk7hfvs4+6yIWB8tO66gB9QZCYN9RSLwV2BvBVVbMLw1tvkc 4a2Vy7MXx8vCn44O2/F7Pbs8dDN7gJ5VA3oINrtf5Q66VN6jNZDUZnG X-Mailer: b4 0.12.3 Message-ID: <20230811-strncpy-arch-powerpc-platforms-ps3-v1-1-301052a5663e@google.com> Subject: [PATCH RFC 1/3] powerpc/ps3: refactor strncpy usage attempt 1 From: Justin Stitt To: Geoff Levand , Michael Ellerman , Nicholas Piggin , Christophe Leroy X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kees Cook , Nick Desaulniers , linux-kernel@vger.kernel.org, Nathan Chancellor , linux-hardening@vger.kernel.org, Justin Stitt , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This approach simply replicates the implementation of `make_field` which means we drop `strncpy` for `memcpy`. Signed-off-by: Justin Stitt --- arch/powerpc/platforms/ps3/repository.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/ps3/repository.c b/arch/powerpc/platforms/ps3/repository.c index 205763061a2d..1abe33fbe529 100644 --- a/arch/powerpc/platforms/ps3/repository.c +++ b/arch/powerpc/platforms/ps3/repository.c @@ -73,9 +73,9 @@ static void _dump_node(unsigned int lpar_id, u64 n1, u64 n2, u64 n3, u64 n4, static u64 make_first_field(const char *text, u64 index) { - u64 n; + u64 n = 0; - strncpy((char *)&n, text, 8); + memcpy((char *)&n, text, strnlen(text, sizeof(n))); return PS3_VENDOR_ID_NONE + (n >> 32) + index; } From patchwork Fri Aug 11 21:19:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin Stitt X-Patchwork-Id: 1820421 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; 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a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1691788764; l=2495; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=OU2B7x8FNL1q157scUIMm8YAPWH0YRRYFkNwfqAAlYc=; b=t8i/MBrRZYTBCyZG+n62sm6BtF8rrxy6c3AXOklnMgD6g/y9j3NSShRjs0U3zb6DojFQXi7R6 t71tXOebyWwC4lP3GudY7BB2KoS2VPhOxRDI6pEsirAJWNJJ7/C+0lD X-Mailer: b4 0.12.3 Message-ID: <20230811-strncpy-arch-powerpc-platforms-ps3-v1-2-301052a5663e@google.com> Subject: [PATCH RFC 2/3] powerpc/ps3: refactor strncpy usage attempt 2 From: Justin Stitt To: Geoff Levand , Michael Ellerman , Nicholas Piggin , Christophe Leroy X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kees Cook , Nick Desaulniers , linux-kernel@vger.kernel.org, Nathan Chancellor , linux-hardening@vger.kernel.org, Justin Stitt , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This approach tries to use `make_field` inside of `make_first_field`. This comes with some weird implementation as to get the same result we need to first subtract `index` from the `make_field` result whilst being careful with order of operations. We then have to add index back. The behavior should be the same but would love some comments on this. Signed-off-by: Justin Stitt --- Note: I swapped the position of the two methods so as to not have to forward declare `make_field`. This results in a weird diff here. --- arch/powerpc/platforms/ps3/repository.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/arch/powerpc/platforms/ps3/repository.c b/arch/powerpc/platforms/ps3/repository.c index 1abe33fbe529..6b731a5d4adc 100644 --- a/arch/powerpc/platforms/ps3/repository.c +++ b/arch/powerpc/platforms/ps3/repository.c @@ -63,36 +63,33 @@ static void _dump_node(unsigned int lpar_id, u64 n1, u64 n2, u64 n3, u64 n4, } /** - * make_first_field - Make the first field of a repository node name. - * @text: Text portion of the field. + * make_field - Make subsequent fields of a repository node name. + * @text: Text portion of the field. Use "" for 'don't care'. * @index: Numeric index portion of the field. Use zero for 'don't care'. * - * This routine sets the vendor id to zero (non-vendor specific). * Returns field value. */ -static u64 make_first_field(const char *text, u64 index) +static u64 make_field(const char *text, u64 index) { u64 n = 0; memcpy((char *)&n, text, strnlen(text, sizeof(n))); - return PS3_VENDOR_ID_NONE + (n >> 32) + index; + return n + index; } /** - * make_field - Make subsequent fields of a repository node name. - * @text: Text portion of the field. Use "" for 'don't care'. + * make_first_field - Make the first field of a repository node name. + * @text: Text portion of the field. * @index: Numeric index portion of the field. Use zero for 'don't care'. * + * This routine sets the vendor id to zero (non-vendor specific). * Returns field value. */ -static u64 make_field(const char *text, u64 index) +static u64 make_first_field(const char *text, u64 index) { - u64 n = 0; - - memcpy((char *)&n, text, strnlen(text, sizeof(n))); - return n + index; + return PS3_VENDOR_ID_NONE + ((make_field(text, index) - index) >> 32) + index; } /** From patchwork Fri Aug 11 21:19:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin Stitt X-Patchwork-Id: 1820420 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=112.213.38.117; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Authentication-Results: legolas.ozlabs.org; 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Fri, 11 Aug 2023 14:19:29 -0700 (PDT) Date: Fri, 11 Aug 2023 21:19:21 +0000 In-Reply-To: <20230811-strncpy-arch-powerpc-platforms-ps3-v1-0-301052a5663e@google.com> Mime-Version: 1.0 References: <20230811-strncpy-arch-powerpc-platforms-ps3-v1-0-301052a5663e@google.com> X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1691788764; l=2360; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=un5KrhEbUeSG5MIia1JYWEm7kQ5KlO4dof2rfH0SxB0=; b=3nGjJYu+m7uWyObArsWKunAcpSZnHjKe9mn5gkmY/yM21roqfaVuczXVmSVp0u0rKkq9+vbWf LjstrWwCo1OAJQJrgXlXQxNm1g4I4F9O5JB8O/Ope1+HZNTSmJBVJ/g X-Mailer: b4 0.12.3 Message-ID: <20230811-strncpy-arch-powerpc-platforms-ps3-v1-3-301052a5663e@google.com> Subject: [PATCH RFC 3/3] powerpc/ps3: refactor strncpy usage attempt 2.5 From: Justin Stitt To: Geoff Levand , Michael Ellerman , Nicholas Piggin , Christophe Leroy X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kees Cook , Nick Desaulniers , linux-kernel@vger.kernel.org, Nathan Chancellor , linux-hardening@vger.kernel.org, Justin Stitt , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Forward declare `make_field` for a cleaner diff Signed-off-by: Justin Stitt --- arch/powerpc/platforms/ps3/repository.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/arch/powerpc/platforms/ps3/repository.c b/arch/powerpc/platforms/ps3/repository.c index 6b731a5d4adc..6a08bb7704da 100644 --- a/arch/powerpc/platforms/ps3/repository.c +++ b/arch/powerpc/platforms/ps3/repository.c @@ -20,6 +20,8 @@ enum ps3_lpar_id { PS3_LPAR_ID_PME = 1, }; +static u64 make_field(const char *text, u64 index); + #define dump_field(_a, _b) _dump_field(_a, _b, __func__, __LINE__) static void _dump_field(const char *hdr, u64 n, const char *func, int line) { @@ -63,33 +65,33 @@ static void _dump_node(unsigned int lpar_id, u64 n1, u64 n2, u64 n3, u64 n4, } /** - * make_field - Make subsequent fields of a repository node name. - * @text: Text portion of the field. Use "" for 'don't care'. + * make_first_field - Make the first field of a repository node name. + * @text: Text portion of the field. * @index: Numeric index portion of the field. Use zero for 'don't care'. * + * This routine sets the vendor id to zero (non-vendor specific). * Returns field value. */ -static u64 make_field(const char *text, u64 index) +static u64 make_first_field(const char *text, u64 index) { - u64 n = 0; - - memcpy((char *)&n, text, strnlen(text, sizeof(n))); - return n + index; + return PS3_VENDOR_ID_NONE + ((make_field(text, index) - index) >> 32) + index; } /** - * make_first_field - Make the first field of a repository node name. - * @text: Text portion of the field. + * make_field - Make subsequent fields of a repository node name. + * @text: Text portion of the field. Use "" for 'don't care'. * @index: Numeric index portion of the field. Use zero for 'don't care'. * - * This routine sets the vendor id to zero (non-vendor specific). * Returns field value. */ -static u64 make_first_field(const char *text, u64 index) +static u64 make_field(const char *text, u64 index) { - return PS3_VENDOR_ID_NONE + ((make_field(text, index) - index) >> 32) + index; + u64 n = 0; + + memcpy((char *)&n, text, strnlen(text, sizeof(n))); + return n + index; } /**