[Bug dynamic-link/30027] New: Internal tunables ABI depends on awk array iteration order

[Bug dynamic-link/30027] New: Internal tunables ABI depends on awk array iteration order

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30027

            Bug ID: 30027
           Summary: Internal tunables ABI depends on awk array iteration
                    order
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---

I do not think GNU awk specifies the array iteration order. The enum type with
the tunables indices is defined like this:

  # Now, the enum names
  print "\ntypedef enum"
  print "{"
  for (tnm in types) {
    split (tnm, indices, SUBSEP);
    t = indices[1];
    n = indices[2];
    m = indices[3];
    printf ("  TUNABLE_ENUM_NAME(%s, %s, %s),\n", t, n, m);
  }
  print "} tunable_id_t;\n"

So the assigned indices depend on array iteration order.

This could be a problem if building glibc multilibs (for glibc-hwcaps), where
the (baseline) ld.so and multilib libc.so.6 come from different builds and have
potentially different iteration order. This can cause crashes because
__tunable_get_val does not perform any type checking. It may store a larger
tunable value than the caller specifies through the value pointer, causing
memory corruption.

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[Bug dynamic-link/30027] Internal tunables ABI depends on awk array iteration order

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30027

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at sourceware dot org   |fweimer at redhat dot com
                 CC|                            |fweimer at redhat dot com

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[Bug dynamic-link/30027] Internal tunables ABI depends on awk array iteration order

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30027

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sam at gentoo dot org

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