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([185.25.67.249]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9392f5485asm325846666b.88.2024.09.26.02.21.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Sep 2024 02:21:20 -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: b1c98281-7be8-11ef-a0ba-8be0dac302b0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1727342481; x=1727947281; 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=zv+yM3lvTRJQIA1+ZYdW3e6DFoAUNOBXydVMy3hCsps=; b=WJE9Lm6vf3DfZDNo3BuHquUd0Y+swMlK4cNVkk9QM8YOw7k+0cGZoWmMgKVFAwJU7k hBCq0hmwC2ntUJBXBXcDaN7qBPWxbxXMPQ6MEI5/DBcdEvVj8/OIB2VbMf8IBTIxsY2F 9HNvAQOY4bAVoOIFW8R5c5NEkEUwUqLkT119s= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727342481; x=1727947281; 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=zv+yM3lvTRJQIA1+ZYdW3e6DFoAUNOBXydVMy3hCsps=; b=JPpx7Pr0CPPk2ptydDpvmwwBtcKjFzoJM8ehw6aGX3gBYLn2PvrMer8aHBZCZLusbB +heWVMgFb3prUemkgOdThDxELfvxYk4p2Q5ht3cgFglMG3eXoDL57VBnqlTXkJ3YDCWL 5jmzffkcrUFwe95ljJ7LxPvHOAIugfEJh/ZERyGCKZp6CxxZNh2vdk5hU8icEkVBDBDd XJZoQiH4mtwtAwGqCSLc9zaPexCthKkb3tiqXqID4/UyjO3u8tKotGf90C4TiYpqW5X9 sDtVgGCDR5vwxzpKzUZ72Y0ncoYZDjpW3IrpawCev3sF3Wr1/xyMgRg18LXyI3WIRGaW 5L2g== X-Gm-Message-State: AOJu0YxucaNBXhv4gPFSsG8w5g+viACyZPI5NWO4wBuLuN6wfXOtqwf8 Ppzeoh13U6/T9de3Z4gUIyU9PK5Qu1KxJ42c4DU09J2R5GZy+8cfy3w4mBPikaQA0JNTX2h0ra9 8 X-Google-Smtp-Source: AGHT+IH8pM7sNRHOHPY0mSu77Jrh0ij1F71jjKeCo0sGy21bnOxVElQnJcwDqoWNpL3dlLEi4l8lrg== X-Received: by 2002:a17:907:36c6:b0:a8a:7884:c491 with SMTP id a640c23a62f3a-a93b15f9342mr247811666b.17.1727342481006; Thu, 26 Sep 2024 02:21:21 -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 v6 3/3] x86/boot: Improve MBI2 structure check Date: Thu, 26 Sep 2024 10:21:09 +0100 Message-Id: <20240926092109.475271-4-frediano.ziglio@cloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240926092109.475271-1-frediano.ziglio@cloud.com> References: <20240926092109.475271-1-frediano.ziglio@cloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1727342507682116600 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 55a1777483..cae26d5e10 100644 --- a/xen/arch/x86/efi/parse-mbi2.c +++ b/xen/arch/x86/efi/parse-mbi2.c @@ -13,6 +13,7 @@ efi_multiboot2_prelude(uint32_t magic, const multiboot2_f= ixed_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 ) @@ -21,7 +22,9 @@ efi_multiboot2_prelude(uint32_t magic, const multiboot2_f= ixed_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)tag + tag->size, MULTIBOOT2_TAG_ALIGN)) ) --=20 2.34.1