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109 lines
3.8 KiB
109 lines
3.8 KiB
From cd2517f4b56e7147d013c7030e09d2c2e3562f2a Mon Sep 17 00:00:00 2001
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From: Jonathan Dieter <jdieter@lesbg.com>
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Date: Mon, 27 Feb 2017 10:04:29 +0200
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Subject: [PATCH v4 1/2] usbip: Fix-format-overflow
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The usbip userspace tools call sprintf()/snprintf() and don't check for
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the return value which can lead the paths to overflow, truncating the
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final file in the path.
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More urgently, GCC 7 now warns that these aren't checked with
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-Wformat-overflow, and with -Werror enabled in configure.ac, that makes
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these tools unbuildable.
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This patch fixes these problems by replacing sprintf() with snprintf() in
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one place and adding checks for the return value of snprintf().
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Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com>
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Signed-off-by: Jonathan Dieter <jdieter@lesbg.com>
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---
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tools/usb/usbip/libsrc/usbip_common.c | 9 ++++++++-
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tools/usb/usbip/libsrc/usbip_host_common.c | 28 +++++++++++++++++++++++-----
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2 files changed, 31 insertions(+), 6 deletions(-)
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diff --git a/tools/usb/usbip/libsrc/usbip_common.c b/tools/usb/usbip/libsrc/usbip_common.c
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index ac73710..1517a23 100644
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--- a/tools/usb/usbip/libsrc/usbip_common.c
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+++ b/tools/usb/usbip/libsrc/usbip_common.c
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@@ -215,9 +215,16 @@ int read_usb_interface(struct usbip_usb_device *udev, int i,
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struct usbip_usb_interface *uinf)
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{
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char busid[SYSFS_BUS_ID_SIZE];
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+ int size;
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struct udev_device *sif;
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- sprintf(busid, "%s:%d.%d", udev->busid, udev->bConfigurationValue, i);
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+ size = snprintf(busid, sizeof(busid), "%s:%d.%d",
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+ udev->busid, udev->bConfigurationValue, i);
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+ if (size < 0 || (unsigned int)size >= sizeof(busid)) {
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+ err("busid length %i >= %lu or < 0", size,
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+ (long unsigned)sizeof(busid));
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+ return -1;
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+ }
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sif = udev_device_new_from_subsystem_sysname(udev_context, "usb", busid);
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if (!sif) {
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diff --git a/tools/usb/usbip/libsrc/usbip_host_common.c b/tools/usb/usbip/libsrc/usbip_host_common.c
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index 9d41522..6ff7b60 100644
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--- a/tools/usb/usbip/libsrc/usbip_host_common.c
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+++ b/tools/usb/usbip/libsrc/usbip_host_common.c
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@@ -40,13 +40,20 @@ struct udev *udev_context;
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static int32_t read_attr_usbip_status(struct usbip_usb_device *udev)
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{
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char status_attr_path[SYSFS_PATH_MAX];
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+ int size;
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int fd;
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int length;
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char status;
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int value = 0;
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- snprintf(status_attr_path, SYSFS_PATH_MAX, "%s/usbip_status",
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- udev->path);
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+ size = snprintf(status_attr_path, sizeof(status_attr_path),
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+ "%s/usbip_status", udev->path);
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+ if (size < 0 || (unsigned int)size >= sizeof(status_attr_path)) {
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+ err("usbip_status path length %i >= %lu or < 0", size,
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+ (long unsigned)sizeof(status_attr_path));
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+ return -1;
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+ }
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+
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fd = open(status_attr_path, O_RDONLY);
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if (fd < 0) {
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@@ -218,6 +225,7 @@ int usbip_export_device(struct usbip_exported_device *edev, int sockfd)
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{
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char attr_name[] = "usbip_sockfd";
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char sockfd_attr_path[SYSFS_PATH_MAX];
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+ int size;
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char sockfd_buff[30];
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int ret;
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@@ -237,10 +245,20 @@ int usbip_export_device(struct usbip_exported_device *edev, int sockfd)
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}
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/* only the first interface is true */
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- snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s",
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- edev->udev.path, attr_name);
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+ size = snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s",
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+ edev->udev.path, attr_name);
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+ if (size < 0 || (unsigned int)size >= sizeof(sockfd_attr_path)) {
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+ err("exported device path length %i >= %lu or < 0", size,
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+ (long unsigned)sizeof(sockfd_attr_path));
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+ return -1;
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+ }
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- snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd);
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+ size = snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd);
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+ if (size < 0 || (unsigned int)size >= sizeof(sockfd_buff)) {
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+ err("socket length %i >= %lu or < 0", size,
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+ (long unsigned)sizeof(sockfd_buff));
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+ return -1;
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+ }
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ret = write_sysfs_attribute(sockfd_attr_path, sockfd_buff,
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strlen(sockfd_buff));
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--
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2.9.3
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