Subject: Fw: [Bug 196533] New: kernel stack infoleaks

From: Stephen Hemminger <[email-masked]>
Date: Sun, 30 Jul 2017 11:03:22 -0700

Begin forwarded message:

Date: Sun, 30 Jul 2017 05:13:08 +0000
From: [email-masked]
To: [email-masked]
Subject: [Bug 196533] New: kernel stack infoleaks

https://bugzilla.kernel.org/show_bug.cgi?id=196533

            Bug ID: 196533
           Summary: kernel stack infoleaks
           Product: Networking
           Version: 2.5
    Kernel Version: 4.12.2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

bug in net/irda/af_irda.c  

Sometimes irda_getsockopt() doesn't initialize all members of list field of
irda_device_list struct.  This structure is then copied to
userland.  It leads to leaking of contents of kernel stack memory.  We have to
initialize them to zero , or it will allows local users to obtain potentially
sensitive information from kernel stack memory by reading a copy of this
structure  

https://github.com/torvalds/linux/pull/440

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