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[209.51.188.17]) by mx.google.com with ESMTPS id l4-20020a0ce084000000b0063cf6957da7si3815494qvk.554.2023.07.25.07.59.44 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 25 Jul 2023 07:59:44 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=xpX1GZZ9; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qOJVJ-0003Of-Ad; Tue, 25 Jul 2023 10:59:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qOJVH-0003HF-I1 for qemu-devel@nongnu.org; Tue, 25 Jul 2023 10:59:11 -0400 Received: from mail-lf1-x12c.google.com ([2a00:1450:4864:20::12c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qOJVE-0001Cs-3s for qemu-devel@nongnu.org; Tue, 25 Jul 2023 10:59:11 -0400 Received: by mail-lf1-x12c.google.com with SMTP id 2adb3069b0e04-4fdd31bf179so8695067e87.2 for ; Tue, 25 Jul 2023 07:59:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1690297146; x=1690901946; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=qSioxDMzRpvFdzVJXhUN5omfX+PmBMAzJgemy6xBhaw=; b=xpX1GZZ9V+sqeNY+hafzPXiByHa8UJTrgdvqxOxcdEzPPIDWDDKGWmIrD5rLzUnSOn I1zHheeFzdfqqADapYCYvGhJ+hgYsmf1w4QE1aRqyv50aEjEaXG+4Jvofi0xD6BhBBen DstFHBunl+A7uiHc5Qj22Eu81Fi6o3SpqJEY0t8JthMHT+7pVjvGKbJvuG15RNS6xueo W/OpvOlAbqm8uzAPLHg63oUqmKGAkR0zmdaZz3VTFI8n2R2eFUoD6X1rgOwNY0/G0o/i Dfhkdb6dOkO/s/VZxi+gVhjHHxQ5GNWUENmmRbSbAtn7/0d+MpQvswWwhJf8vmXWC2fP nicQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690297146; x=1690901946; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=qSioxDMzRpvFdzVJXhUN5omfX+PmBMAzJgemy6xBhaw=; b=YV/YQF3ywhIYliPq2eIS/9Fz6QHCGU+oRAulQb8m7+SzlvOnTbcwR/XwLPBTxNuxnE fuLm0NNz9zGZYzlX27JUWX7p4G4K5gqY6Gc1VW9QqqE8vepsHnQrjpLy2WJzP/3q0Zoe pELOtYxj36aKMCgjs99EMg+jvTam+B/jTHpCqKlNLt683E3gGfBTye04kb7RgL+fsMTs /TBQmdxLglxRCoGnwv1qzsI35Gu08o2icsvkpMB70cRTlSkN5aI43yomgTaEEtt/9OgJ FVkZfzTuZQWxmcT5lU4yQoNLKxj+YAq16clUt6HO3wT23XMNwstb4WnAyRCiBKtlXGMg XlJA== X-Gm-Message-State: ABy/qLaXZpcOsnaI0a+pna2bR3aoATqjzBVP9YjJCVcIeArVtdQBjEuA r29FZB15TiqnVF2yPTFVB56O0EKoTgXeOgulPfA= X-Received: by 2002:a05:6512:401e:b0:4fb:7447:e71a with SMTP id br30-20020a056512401e00b004fb7447e71amr8173027lfb.63.1690297146152; Tue, 25 Jul 2023 07:59:06 -0700 (PDT) Received: from localhost.localdomain ([176.187.203.142]) by smtp.gmail.com with ESMTPSA id w9-20020adfd4c9000000b0031423a8f4f7sm16821042wrk.56.2023.07.25.07.59.05 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 25 Jul 2023 07:59:05 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Mark Cave-Ayland , Artyom Tarasenko , Bastian Koppelmann , qemu-block@nongnu.org, =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Richard Henderson Subject: [PULL 06/10] target/mips/mxu: Avoid overrun in gen_mxu_q8adde() Date: Tue, 25 Jul 2023 16:58:25 +0200 Message-Id: <20230725145829.37782-7-philmd@linaro.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230725145829.37782-1-philmd@linaro.org> References: <20230725145829.37782-1-philmd@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::12c; envelope-from=philmd@linaro.org; helo=mail-lf1-x12c.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Coverity reports a potential overruns (CID 1517770): Overrunning array "mxu_gpr" of 15 8-byte elements at element index 4294967295 (byte offset 34359738367) using index "XRb - 1U" (which evaluates to 4294967295). Add a gen_extract_mxu_gpr() helper similar to gen_load_mxu_gpr() to safely extract MXU registers. Fixes: eb79951ab6 ("target/mips/mxu: Add Q8ADDE ... insns") Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Richard Henderson Message-Id: <20230712060806.82323-4-philmd@linaro.org> --- target/mips/tcg/mxu_translate.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/target/mips/tcg/mxu_translate.c b/target/mips/tcg/mxu_translate.c index 520747a597..e662acd5df 100644 --- a/target/mips/tcg/mxu_translate.c +++ b/target/mips/tcg/mxu_translate.c @@ -644,6 +644,16 @@ static inline void gen_store_mxu_gpr(TCGv t, unsigned int reg) } } +static inline void gen_extract_mxu_gpr(TCGv t, unsigned int reg, + unsigned int ofs, unsigned int len) +{ + if (reg == 0) { + tcg_gen_movi_tl(t, 0); + } else if (reg <= 15) { + tcg_gen_extract_tl(t, mxu_gpr[reg - 1], ofs, len); + } +} + /* MXU control register moves. */ static inline void gen_load_mxu_cr(TCGv t) { @@ -3004,10 +3014,10 @@ static void gen_mxu_q8adde(DisasContext *ctx, bool accumulate) TCGv t5 = tcg_temp_new(); if (XRa != 0) { - tcg_gen_extract_tl(t0, mxu_gpr[XRb - 1], 16, 8); - tcg_gen_extract_tl(t1, mxu_gpr[XRc - 1], 16, 8); - tcg_gen_extract_tl(t2, mxu_gpr[XRb - 1], 24, 8); - tcg_gen_extract_tl(t3, mxu_gpr[XRc - 1], 24, 8); + gen_extract_mxu_gpr(t0, XRb, 16, 8); + gen_extract_mxu_gpr(t1, XRc, 16, 8); + gen_extract_mxu_gpr(t2, XRb, 24, 8); + gen_extract_mxu_gpr(t3, XRc, 24, 8); if (aptn2 & 2) { tcg_gen_sub_tl(t0, t0, t1); tcg_gen_sub_tl(t2, t2, t3); @@ -3027,10 +3037,10 @@ static void gen_mxu_q8adde(DisasContext *ctx, bool accumulate) tcg_gen_or_tl(t4, t2, t0); } if (XRd != 0) { - tcg_gen_extract_tl(t0, mxu_gpr[XRb - 1], 0, 8); - tcg_gen_extract_tl(t1, mxu_gpr[XRc - 1], 0, 8); - tcg_gen_extract_tl(t2, mxu_gpr[XRb - 1], 8, 8); - tcg_gen_extract_tl(t3, mxu_gpr[XRc - 1], 8, 8); + gen_extract_mxu_gpr(t0, XRb, 0, 8); + gen_extract_mxu_gpr(t1, XRc, 0, 8); + gen_extract_mxu_gpr(t2, XRb, 8, 8); + gen_extract_mxu_gpr(t3, XRc, 8, 8); if (aptn2 & 1) { tcg_gen_sub_tl(t0, t0, t1); tcg_gen_sub_tl(t2, t2, t3);