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[76.251.165.188]) by smtp.gmail.com with ESMTPSA id d28sm121339ooa.7.2020.09.03.14.01.25 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Thu, 03 Sep 2020 14:01:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=yJG4bmyAfe4onsh//+ldhVr9OuPhOmvC3Rda7LK2uCg=; b=k6xOby3thIRRJDddVQLvw+z8lV4QE2aD9x/EsyTbu+ghwGLGlJVyrhLxRrPiaNbKZ1 Dcso8v6iTgu2aFSxPr8nzYftgA0ZCbCF97uNLI3p29opJKHsH3X7fgtpdyc4Lx7ULNMv ruZ4ildZnd6XUZcoFQJUN7ZnSIClBaze5P3ncBdYMXqmefVLYvwwtL4mI9ziVFlNH3cu Vzl7GDbX4nTznbgXl7A5SJCFLOulHkM8/v2BPoSbS2LtxE8+fcuxXaescTYcjg4FjFM3 +ZHx/mJc052FVLg0KWkPmc44rZ4HxNxpXzKHeyHJO5NPEFbKkgUL4/3Mb/QQFCiXKt7n nXJw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references; bh=yJG4bmyAfe4onsh//+ldhVr9OuPhOmvC3Rda7LK2uCg=; b=F474/gaPJ3kSU9GI0GZQt5KZ9+wrqM9FJTotEq/+rYiDnMB1bKBQ1h6bUQ/b0ONffY 42KjkVxgPc3IiluOvxwYK6AHTRj8ZCYIeygTEt9MsvUJZjBxfK5l+yYqFkE2VO0xJO3X oqSGuKRTi2+mk53MbmiACuQ9x9aqt2ocjTY7sa0cv2J78ld/C2+4R1rcyaCHtK/qklw8 XfFpEj4sUSd6drDa3m1TvwUUeUsQOvPFt0oBzYK/92LKXqRUUwrdz+0zozl6S2inCKIH lMrnatOOkmsuiTx3n+dU+43VVWVLPctpBlZaU4AvcYu3s/4YDVpPg3Zdm5vj4+9rR2KD T2Lg== X-Gm-Message-State: AOAM53077Kpi5oA2lZIm/HJ8taO++5mllnbTPiivQkDxhU3K2EXmCOuo t9WQakRH8poF8dpZOOkr5gzW16KW6UMPKQ== X-Google-Smtp-Source: ABdhPJwI5FZOom6VdQLObxT/oi/6gDRd470470UysICywiKz7qDdueAXK9CfupJDhmn6+N4znDpRQA== X-Received: by 2002:aca:b705:: with SMTP id h5mr3203765oif.31.1599166886612; Thu, 03 Sep 2020 14:01:26 -0700 (PDT) From: Michael Roth To: qemu-devel@nongnu.org Subject: [PATCH 77/77] usb: fix setup_len init (CVE-2020-14364) Date: Thu, 3 Sep 2020 15:59:35 -0500 Message-Id: <20200903205935.27832-78-mdroth@linux.vnet.ibm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200903205935.27832-1-mdroth@linux.vnet.ibm.com> References: <20200903205935.27832-1-mdroth@linux.vnet.ibm.com> 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=2607:f8b0:4864:20::244; envelope-from=flukshun@gmail.com; helo=mail-oi1-x244.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-stable@nongnu.org, Gerd Hoffmann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Gerd Hoffmann Store calculated setup_len in a local variable, verify it, and only write it to the struct (USBDevice->setup_len) in case it passed the sanity checks. This prevents other code (do_token_{in,out} functions specifically) from working with invalid USBDevice->setup_len values and overrunning the USBDevice->setup_buf[] buffer. Fixes: CVE-2020-14364 Signed-off-by: Gerd Hoffmann Tested-by: Gonglei Reviewed-by: Li Qiang Message-id: 20200825053636.29648-1-kraxel@redhat.com (cherry picked from commit b946434f2659a182afc17e155be6791ebfb302eb) Signed-off-by: Michael Roth --- hw/usb/core.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/hw/usb/core.c b/hw/usb/core.c index 5abd128b6b..5234dcc73f 100644 --- a/hw/usb/core.c +++ b/hw/usb/core.c @@ -129,6 +129,7 @@ void usb_wakeup(USBEndpoint *ep, unsigned int stream) static void do_token_setup(USBDevice *s, USBPacket *p) { int request, value, index; + unsigned int setup_len; =20 if (p->iov.size !=3D 8) { p->status =3D USB_RET_STALL; @@ -138,14 +139,15 @@ static void do_token_setup(USBDevice *s, USBPacket *p) usb_packet_copy(p, s->setup_buf, p->iov.size); s->setup_index =3D 0; p->actual_length =3D 0; - s->setup_len =3D (s->setup_buf[7] << 8) | s->setup_buf[6]; - if (s->setup_len > sizeof(s->data_buf)) { + setup_len =3D (s->setup_buf[7] << 8) | s->setup_buf[6]; + if (setup_len > sizeof(s->data_buf)) { fprintf(stderr, "usb_generic_handle_packet: ctrl buffer too small (%d > %z= u)\n", - s->setup_len, sizeof(s->data_buf)); + setup_len, sizeof(s->data_buf)); p->status =3D USB_RET_STALL; return; } + s->setup_len =3D setup_len; =20 request =3D (s->setup_buf[0] << 8) | s->setup_buf[1]; value =3D (s->setup_buf[3] << 8) | s->setup_buf[2]; @@ -259,26 +261,28 @@ static void do_token_out(USBDevice *s, USBPacket *p) static void do_parameter(USBDevice *s, USBPacket *p) { int i, request, value, index; + unsigned int setup_len; =20 for (i =3D 0; i < 8; i++) { s->setup_buf[i] =3D p->parameter >> (i*8); } =20 s->setup_state =3D SETUP_STATE_PARAM; - s->setup_len =3D (s->setup_buf[7] << 8) | s->setup_buf[6]; s->setup_index =3D 0; =20 request =3D (s->setup_buf[0] << 8) | s->setup_buf[1]; value =3D (s->setup_buf[3] << 8) | s->setup_buf[2]; index =3D (s->setup_buf[5] << 8) | s->setup_buf[4]; =20 - if (s->setup_len > sizeof(s->data_buf)) { + setup_len =3D (s->setup_buf[7] << 8) | s->setup_buf[6]; + if (setup_len > sizeof(s->data_buf)) { fprintf(stderr, "usb_generic_handle_packet: ctrl buffer too small (%d > %z= u)\n", - s->setup_len, sizeof(s->data_buf)); + setup_len, sizeof(s->data_buf)); p->status =3D USB_RET_STALL; return; } + s->setup_len =3D setup_len; =20 if (p->pid =3D=3D USB_TOKEN_OUT) { usb_packet_copy(p, s->data_buf, s->setup_len); --=20 2.17.1