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([185.25.67.249]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a906109718bsm559125666b.34.2024.09.18.02.23.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Sep 2024 02:23:07 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 9e41cb69-759f-11ef-a0b8-8be0dac302b0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1726651388; x=1727256188; darn=lists.xenproject.org; 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=76bJmVRgoyuRftic5KQh8KmD08jovx2iL9DhRm4U/lo=; b=F2nRc1UjgFTmESZydi8vAqfSPyuCBK8F1rBh7FuuzgtWdH3LPGjPSB4uWEWhToYllt daBaHEEZ1qJgbgDUTebOg0ZTumsVAl7efij3yGCv9H9Tcgqax97sv19uH0zS+acvTGZ0 1jNyVBT0JcFQHIT3ASDz86m50BZ84jKxUQiJc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726651388; x=1727256188; 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=76bJmVRgoyuRftic5KQh8KmD08jovx2iL9DhRm4U/lo=; b=Zqw5xKVNB6500XIuyXtt/wf40APVF4wbvBoAH6icJkXvMXe1ib4Z5v1RqUFRtn2DfY ZmNcrS4NIx5pyxhndj/gwxCXto6wb9YNKTpimsUPHjH+ALaqw4O9c6wFw8QLfnYBO7K2 4fjQHZXjpF5gAGMZnP7zFyFanFLaOIr2wWi836qrrSyj+sI5oYkeFnUswLzcfpMuosET CEJn9eu847h/PfuvO5QcivBYU3JPw28BR+VdEXSMOJdTkZ/zX8lVhyN1GbOKPkMAbcO6 yzAY2WuCiO/zsuy54gDpIbk3cnaa0mcCYG05jUHMGEmaYfINq0YVS7by+NZ+50sMolpN AV4w== X-Gm-Message-State: AOJu0YyukCVI5SNfgxCv+V0NB9kS2vX2+zAdkzvaqCtIc6CwHp/PF/5X sSLh3li0qKAWR4GGtVlE0KuPaMjZbv96h5TLlmTKdXpD2pqy8J1Q0x0pYnp9Z777lasmtSWewzj v X-Google-Smtp-Source: AGHT+IFEp/u+VUPtxAjeVGb1u/u7pp2Nj5RBUYuw+I7Zrj1Fea0oc1XRWYT5UzIgnFUvu1BdOycgaw== X-Received: by 2002:a17:907:f703:b0:a8a:7f08:97a6 with SMTP id a640c23a62f3a-a902943932amr2051093266b.24.1726651387902; Wed, 18 Sep 2024 02:23:07 -0700 (PDT) From: Frediano Ziglio To: xen-devel@lists.xenproject.org Cc: Frediano Ziglio , "Daniel P. Smith" , =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v2 4/4] x86/boot: Improve MBI2 structure check Date: Wed, 18 Sep 2024 10:22:55 +0100 Message-Id: <20240918092255.13527-5-frediano.ziglio@cloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240918092255.13527-1-frediano.ziglio@cloud.com> References: <20240918092255.13527-1-frediano.ziglio@cloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1726651413336116600 Content-Type: text/plain; charset="utf-8" Tag structure should contain at least the tag header. Entire tag structure must be contained inside MBI2 data. Signed-off-by: Frediano Ziglio --- xen/arch/x86/efi/parse-mbi2.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/efi/parse-mbi2.c b/xen/arch/x86/efi/parse-mbi2.c index 6038f35b16..7efda8fab2 100644 --- a/xen/arch/x86/efi/parse-mbi2.c +++ b/xen/arch/x86/efi/parse-mbi2.c @@ -22,6 +22,7 @@ efi_parse_mbi2(uint32_t magic, const multiboot2_fixed_t *= mbi) EFI_HANDLE ImageHandle =3D NULL; EFI_SYSTEM_TABLE *SystemTable =3D NULL; const char *cmdline =3D NULL; + const void *const mbi_end =3D (const void *)mbi + mbi->total_size; bool have_bs =3D false; =20 if ( magic !=3D MULTIBOOT2_BOOTLOADER_MAGIC ) @@ -30,7 +31,9 @@ efi_parse_mbi2(uint32_t magic, const multiboot2_fixed_t *= mbi) /* Skip Multiboot2 information fixed part. */ tag =3D _p(ROUNDUP((unsigned long)(mbi + 1), MULTIBOOT2_TAG_ALIGN)); =20 - for ( ; (const void *)tag - (const void *)mbi < mbi->total_size + for ( ; (const void *)(tag + 1) <=3D mbi_end + && tag->size >=3D sizeof(*tag) + && (const void *)tag + tag->size <=3D mbi_end && tag->type !=3D MULTIBOOT2_TAG_TYPE_END; tag =3D _p(ROUNDUP((unsigned long)((const void *)tag + tag->size= ), MULTIBOOT2_TAG_ALIGN)) ) --=20 2.34.1