From: Kay Sievers <kay@vrfy.org>
Date: Sun, 17 Feb 2013 18:55:15 +0000 (+0100)
Subject: udev: usb_id - ignore non-ASCII serial numbers
X-Git-Tag: v198~210
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=a2cbfd5916ee13b216a314826083e4c4e06930d1;p=elogind.git

udev: usb_id - ignore non-ASCII serial numbers

On Thu, Feb 7, 2013 at 3:52 PM, Robert Milasan <rmilasan@suse.com> wrote:
> Hi, seems that using some strange usb devices with really bogus serial
> numbers usb_id creates links with junk strings in it:
>
> /dev/disk/by-id/usb-TSSTcorp_BDDVDW_SE-506AB_㡒䍌䜶䉗ぁㄴ㌴†ँ-0:0
>
> Initially was believed that usb_id is to blame, then the kernel, but it
> turns out that really the usb cd/dvd drive has this bogus serial number:
>
> output from dmesg:
> [  538.200160] usb 1-2: new high-speed USB device number 5 using
> ehci_hcd [  538.335067] usb 1-2: New USB device found, idVendor=0e8d,
> idProduct=1956 [  538.335080] usb 1-2: New USB device strings: Mfr=1,
> Product=2, SerialNumber=3 [  538.335089] usb 1-2: Product: MT1956
> [  538.335097] usb 1-2: Manufacturer: MediaTek Inc
> [  538.335105] usb 1-2: SerialNumber:
> \xffffffe3\xffffffa1\xffffff92\xffffffe4\xffffff8d\xffffff8c ...
> [  538.337540] scsi6 : usb-storage 1-2:1.0 [  539.341385] scsi 6:0:0:0:
> CD-ROM            TSSTcorp BDDVDW SE-506AB  TS00 PQ: 0 ANSI: 0
> [  539.354240] sr0: scsi3-mmc drive: 0x/24x writer dvd-ram cd/rw
> xa/form2 cdda tray [  539.354777] sr 6:0:0:0: Attached scsi CD-ROM sr0
> [  539.355122] sr 6:0:0:0: Attached scsi generic sg2 type 5
---

diff --git a/src/udev/udev-builtin-usb_id.c b/src/udev/udev-builtin-usb_id.c
index 01e42ca7b..ee83d4fde 100644
--- a/src/udev/udev-builtin-usb_id.c
+++ b/src/udev/udev-builtin-usb_id.c
@@ -431,6 +431,17 @@ fallback:
                 const char *usb_serial;
 
                 usb_serial = udev_device_get_sysattr_value(dev_usb, "serial");
+                if (usb_serial) {
+                        const unsigned char *p;
+
+                        /* http://msdn.microsoft.com/en-us/library/windows/hardware/gg487321.aspx */
+                        for (p = (unsigned char *)usb_serial; *p != '\0'; p++)
+                                if (*p < 0x20 || *p > 0x7f || *p == ',') {
+                                        usb_serial = NULL;
+                                        break;
+                                }
+                }
+
                 if (usb_serial) {
                         util_replace_whitespace(usb_serial, serial_str, sizeof(serial_str)-1);
                         util_replace_chars(serial_str, NULL);