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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug stdio/14771] New: add length sanity check to snprintf
Date: Fri, 26 Oct 2012 10:06:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14771

             Bug #: 14771
           Summary: add length sanity check to snprintf
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
        AssignedTo: fweimer@redhat.com
        ReportedBy: fweimer@redhat.com
    Classification: Unclassified


We should reject impossibly large size arguments for snprintf, vsprintf.  This
is similar to bug 13592.  Passing (size_t)-1 to snprintf to emulate the sprintf
behavior might actually be valid code, so this would have to be restricted to
-D_FORTIFY_SOURCE mode.

This is prompted by
<https://lists.exim.org/lurker/message/20121026.080330.74b9147b.en.html>
(CVE-2012-5671).

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