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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id i13-20020a05600c354d00b0040e45799541sm3287805wmq.15.2024.01.25.09.32.12 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Jan 2024 09:32:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1706203933; x=1706808733; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=Pwpt9wjrohdTqeijR7zcxx8QTW0iX7DDa8r/R2Jitvo=; b=ffEN8C6J/0/GnUh6VwPq7UqAq1k2VMI5tGwNquDViq0GDBmNPZ85MIh1UJ4YrXhdBf pAFOtlDj4LAdXKrNF97Z/JHaydMsjFoYCzf6bZ9mIO+DPwKl4LAarebz52Q/Gf8bv4u8 3z9CnJg7ffEQDGvl1TX6cpW2lZmV7lQlL7diSfGqz+xv9m2ipiTFbg0hdbxnc7I5zMgw NchahjEkyVK99DTOI+mZZ1gk04IhSnSCypvrJDLnLGU8ctcaxv19lL7w6I/+ZFlbPk4j Q7RlH0BT5TzxnWE7WljXbHLWdk6OulF4dEnOiy4BIbuzMyPrawRL2Mqh+7aNHDAyfigp lC2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706203933; x=1706808733; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Pwpt9wjrohdTqeijR7zcxx8QTW0iX7DDa8r/R2Jitvo=; b=X2KXg4vNnxZfpgveiq6Ljen0MvMfP/mO7PGu+Glq8kJBzat4SfdyexaeGWXKD/Uh1P rrRyTfho3r9FTdl2F5+/T3N2hg7qfusSoOCXkMbIN2osVprGB1w5DrkNn6euozryB4Gq 9BM0fVxifcFBmYwBfrSerGP8tz8oUZ89D69MAdj9116pSawrcKNi1755TS4Uyp12EQep NrEur7RgsRclDbeKuAJwh3hY9pQNfb/6Z0Q++fzkdjDU7b7mz148+Nybv7d3qGvE58rs 7+31SsiOsj8VvEzGOqIDstmfDNwsQAUhP6zVPhamO1QYZ1wJ7PSG1T24C/Es4Ad9ovU2 uH0Q== X-Gm-Message-State: AOJu0YwZ7DubNjoCQRfUUno+Gmwnz51hU8cNZkrvcTZhMHwr7rHbweNI TIt6+tPWWZPihp852AsWE3ZszZ9GWDOP2OJcYUlcQe2Qze8OdhmhvQzogh3YeBU73ZSZ2w8u8tY b X-Google-Smtp-Source: AGHT+IFi4h1X/4FqYcA7zygtCKeBpB5zJv93wNRzabMViZCczgJpxD2VAaZD/LJ3PDL/hSLflIE6QQ== X-Received: by 2002:a05:600c:5756:b0:40e:c69d:94f3 with SMTP id jw22-20020a05600c575600b0040ec69d94f3mr51726wmb.185.1706203932991; Thu, 25 Jan 2024 09:32:12 -0800 (PST) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PATCH 2/2] meson: Enable -Wvla Date: Thu, 25 Jan 2024 17:32:11 +0000 Message-Id: <20240125173211.1786196-3-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240125173211.1786196-1-peter.maydell@linaro.org> References: <20240125173211.1786196-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::329; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x329.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=ham 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1706204001341100003 Content-Type: text/plain; charset="utf-8" QEMU has historically used variable length arrays only very rarely. Variable length arrays are a potential security issue where an on-stack dynamic allocation isn't correctly size-checked, especially when the size comes from the guest. (An example problem of this kind from the past is CVE-2021-3527). Forbidding them entirely is a defensive measure against further bugs of this kind. Enable -Wvla to prevent any new uses from sneaking into the codebase. Signed-off-by: Peter Maydell Reviewed-by: Thomas Huth Reviewed-by: Zhao Liu --- meson.build | 1 + 1 file changed, 1 insertion(+) diff --git a/meson.build b/meson.build index d0329966f1b..385b8247073 100644 --- a/meson.build +++ b/meson.build @@ -601,6 +601,7 @@ warn_flags =3D [ '-Wno-psabi', '-Wno-gnu-variable-sized-type-not-at-end', '-Wshadow=3Dlocal', + '-Wvla', ] =20 if host_os !=3D 'darwin' --=20 2.34.1