[Bug dynamic-link/30613] New: Unexpanded $ORIGIN paths are stored on libname list if dlopen called with DST

[Bug dynamic-link/30613] New: Unexpanded $ORIGIN paths are stored on libname list if dlopen called with DST

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30613

            Bug ID: 30613
           Summary: Unexpanded $ORIGIN paths are stored on libname list if
                    dlopen called with DST
           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: ---
             Flags: security-

This seems to happen if $ORIGIN substitutions are used in dlopen. This is
either a harmless waste of memory (because the unexpanded paths are never used
for lookup), or a correctness issue (because the $ORIGIN paths depend on the
caller of dlopen).

Here's a dump of the libname aliases from the elf/tst-global1 test case:

namespace 0
  '' 0x7ffff7ffe2d0
      origin 0x7ffff7ffe8a0 "/home/fweimer/src/gnu/glibc/build-master/elf"
      alias ''
  'linux-vdso.so.1' 0x7ffff7ffe930
      alias 'linux-vdso.so.1'
  './libc.so.6' 0x7ffff7fbc480
      origin 0x7ffff7fbc950 "/home/fweimer/src/gnu/glibc/build-master/."
      alias 'libc.so.6'
  '/home/fweimer/src/gnu/glibc/build-master/elf/ld-linux-x86-64.so.2'
0x7ffff7ffdab0 <_rtld_local+2736>
      alias '/lib64/ld-linux-x86-64.so.2'
      alias 'ld-linux-x86-64.so.2'
  '/home/fweimer/src/gnu/glibc/build-master/elf/testobj6.so' 0x7ffff7fff2f0
      origin 0x7ffff7fff7d0 "/home/fweimer/src/gnu/glibc/build-master/elf"
      alias '$ORIGIN/testobj6.so'
  '/home/fweimer/src/gnu/glibc/build-master/elf/testobj1.so' 0x7ffff7fff870
      origin 0x7ffff7fffd80 "/home/fweimer/src/gnu/glibc/build-master/elf"
      alias '/home/fweimer/src/gnu/glibc/build-master/elf/testobj1.so'
  '/home/fweimer/src/gnu/glibc/build-master/elf/testobj2.so' 0x7ffff7fffe20
      origin 0x7ffff8000330 "/home/fweimer/src/gnu/glibc/build-master/elf"
      alias '/home/fweimer/src/gnu/glibc/build-master/elf/testobj2.so'
      alias '$ORIGIN/testobj2.so'

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