From patchwork Thu Mar 8 13:22:25 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Kitt X-Patchwork-Id: 10268091 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D978560364 for ; Thu, 8 Mar 2018 13:34:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C84FF298CD for ; Thu, 8 Mar 2018 13:34:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BA7CE2992B; Thu, 8 Mar 2018 13:34:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 7F8DE298CD for ; Thu, 8 Mar 2018 13:34:19 +0000 (UTC) Received: (qmail 32436 invoked by uid 550); 8 Mar 2018 13:34:17 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Delivered-To: moderator for kernel-hardening@lists.openwall.com Received: (qmail 20407 invoked from network); 8 Mar 2018 13:22:52 -0000 From: Stephen Kitt To: hare@suse.com Cc: linux-scsi@vger.kernel.org, kernel-hardening@lists.openwall.com, linux-kernel@vger.kernel.org, Stephen Kitt Subject: [PATCH] aic7xxx/aic79xx: remove VLAs Date: Thu, 8 Mar 2018 14:22:25 +0100 Message-Id: <20180308132225.13229-1-steve@sk2.org> X-Mailer: git-send-email 2.11.0 X-Virus-Scanned: ClamAV using ClamSMTP In preparation to enabling -Wvla, remove VLAs and replace them with fixed-length arrays instead. The arrays fixed here, using the number of constant sections, aren't really VLAs, but they appear so to the compiler. Since we know at build-time how many critical sections there are, we might as well use a pre-processor-level constant instead. This was prompted by https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Stephen Kitt --- drivers/scsi/aic7xxx/aic79xx_core.c | 8 ++++---- drivers/scsi/aic7xxx/aic79xx_seq.h_shipped | 3 +-- drivers/scsi/aic7xxx/aic7xxx_core.c | 8 ++++---- drivers/scsi/aic7xxx/aic7xxx_seq.h_shipped | 3 +-- drivers/scsi/aic7xxx/aicasm/aicasm.c | 6 ++++-- 5 files changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c b/drivers/scsi/aic7xxx/aic79xx_core.c index b560f396ee99..034f4eebb160 100644 --- a/drivers/scsi/aic7xxx/aic79xx_core.c +++ b/drivers/scsi/aic7xxx/aic79xx_core.c @@ -9338,9 +9338,9 @@ ahd_dumpseq(struct ahd_softc* ahd) static void ahd_loadseq(struct ahd_softc *ahd) { - struct cs cs_table[num_critical_sections]; - u_int begin_set[num_critical_sections]; - u_int end_set[num_critical_sections]; + struct cs cs_table[NUM_CRITICAL_SECTIONS]; + u_int begin_set[NUM_CRITICAL_SECTIONS]; + u_int end_set[NUM_CRITICAL_SECTIONS]; const struct patch *cur_patch; u_int cs_count; u_int cur_cs; @@ -9456,7 +9456,7 @@ ahd_loadseq(struct ahd_softc *ahd) * Move through the CS table until we find a CS * that might apply to this instruction. */ - for (; cur_cs < num_critical_sections; cur_cs++) { + for (; cur_cs < NUM_CRITICAL_SECTIONS; cur_cs++) { if (critical_sections[cur_cs].end <= i) { if (begin_set[cs_count] == TRUE && end_set[cs_count] == FALSE) { diff --git a/drivers/scsi/aic7xxx/aic79xx_seq.h_shipped b/drivers/scsi/aic7xxx/aic79xx_seq.h_shipped index 4b51e232392f..20fb9ca9e271 100644 --- a/drivers/scsi/aic7xxx/aic79xx_seq.h_shipped +++ b/drivers/scsi/aic7xxx/aic79xx_seq.h_shipped @@ -1186,5 +1186,4 @@ static const struct cs { { 759, 763 } }; -static const int num_critical_sections = sizeof(critical_sections) - / sizeof(*critical_sections); +#define NUM_CRITICAL_SECTIONS 14 diff --git a/drivers/scsi/aic7xxx/aic7xxx_core.c b/drivers/scsi/aic7xxx/aic7xxx_core.c index 6612ff3b2e83..e97eceacf522 100644 --- a/drivers/scsi/aic7xxx/aic7xxx_core.c +++ b/drivers/scsi/aic7xxx/aic7xxx_core.c @@ -6848,9 +6848,9 @@ ahc_dumpseq(struct ahc_softc* ahc) static int ahc_loadseq(struct ahc_softc *ahc) { - struct cs cs_table[num_critical_sections]; - u_int begin_set[num_critical_sections]; - u_int end_set[num_critical_sections]; + struct cs cs_table[NUM_CRITICAL_SECTIONS]; + u_int begin_set[NUM_CRITICAL_SECTIONS]; + u_int end_set[NUM_CRITICAL_SECTIONS]; const struct patch *cur_patch; u_int cs_count; u_int cur_cs; @@ -6915,7 +6915,7 @@ ahc_loadseq(struct ahc_softc *ahc) * Move through the CS table until we find a CS * that might apply to this instruction. */ - for (; cur_cs < num_critical_sections; cur_cs++) { + for (; cur_cs < NUM_CRITICAL_SECTIONS; cur_cs++) { if (critical_sections[cur_cs].end <= i) { if (begin_set[cs_count] == TRUE && end_set[cs_count] == FALSE) { diff --git a/drivers/scsi/aic7xxx/aic7xxx_seq.h_shipped b/drivers/scsi/aic7xxx/aic7xxx_seq.h_shipped index 07e93fbae706..d814f1d6b820 100644 --- a/drivers/scsi/aic7xxx/aic7xxx_seq.h_shipped +++ b/drivers/scsi/aic7xxx/aic7xxx_seq.h_shipped @@ -1304,5 +1304,4 @@ static const struct cs { { 875, 877 } }; -static const int num_critical_sections = sizeof(critical_sections) - / sizeof(*critical_sections); +#define NUM_CRITICAL_SECTIONS 7 diff --git a/drivers/scsi/aic7xxx/aicasm/aicasm.c b/drivers/scsi/aic7xxx/aicasm/aicasm.c index 21ac265280bf..bdffe84221ce 100644 --- a/drivers/scsi/aic7xxx/aicasm/aicasm.c +++ b/drivers/scsi/aic7xxx/aicasm/aicasm.c @@ -353,6 +353,7 @@ output_code() critical_section_t *cs; symbol_node_t *cur_node; int instrcount; + int num_critical_sections; instrcount = 0; fprintf(ofile, @@ -440,19 +441,20 @@ output_code() " uint16_t end;\n" "} critical_sections[] = {\n"); + num_critical_sections = 0; for (cs = TAILQ_FIRST(&cs_tailq); cs != NULL; cs = TAILQ_NEXT(cs, links)) { fprintf(ofile, "%s\t{ %d, %d }", cs == TAILQ_FIRST(&cs_tailq) ? "" : ",\n", cs->begin_addr, cs->end_addr); + num_critical_sections++; } fprintf(ofile, "\n};\n\n"); fprintf(ofile, -"static const int num_critical_sections = sizeof(critical_sections)\n" -" / sizeof(*critical_sections);\n"); + "#define NUM_CRITICAL_SECTIONS %d\n", num_critical_sections); fprintf(stderr, "%s: %d instructions used\n", appname, instrcount); }