[Bug 3133] New: LDSO_STANDALONE_SUPPORT does not work on ARM

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=3133

           Summary: LDSO_STANDALONE_SUPPORT does not work on ARM
           Product: uClibc
           Version: 0.9.30.1
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Shared Library Support
        AssignedTo: unassigned at uclibc.org
        ReportedBy: sven-ola at gmx.de
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


Created attachment 2875
  --> https://bugs.busybox.net/attachment.cgi?id=2875
Fix LDSO_STANDALONE_SUPPORT

I've added the LDSO_STANDALONE_SUPPORT patch posted on the uclibc-mailing-list
in sept-2010. The patch should add the standalone-run feature to the
ld-uClibc.so program (that is: specifiy a binary to run on the command line).

This does not work, because of a minor flaw in ldso/ldso/dl-elf.c. This is the
scenario:

exec: ./lib/ld-uClibc.so.0 ./bin/busybox
call to _dl_load_elf_shared_library()
minvma value extracted from segment->p_vaddr (== 0x8000)
minvma &= ~0xffff (== set to zero)
mmap(zero, ..., MAP_FIXED) (== invalid from kernel)

This is at least true for Linux sgt 2.6.32.9 #1 Thu Nov 25 23:27:59 KST 2010
armv7l GNU/Linux (that is a Samsung-Galaxy-Tab mobile phone running
Debian-Squeeze-Armel).

Attached Patch solves this -> needs sensible review by some ld.so wizard.

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