Bug 1010398

Summary: Executables that call ifuncs aren't prelinked on s390x
Product: [Fedora] Fedora Reporter: Richard Sandiford <rsandifo>
Component: prelinkAssignee: Jakub Jelinek <jakub>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 19CC: jakub, mjw
Target Milestone: ---   
Target Release: ---   
Hardware: s390x   
OS: Unspecified   
Whiteboard:
Fixed In Version: prelink-0.5.0-3.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-02-18 11:14:03 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1013801    
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Suggested fix none

Description Richard Sandiford 2013-09-20 17:08:16 UTC
Created attachment 800586 [details]
Suggested fix

Description of problem:

  If an executable has a PLT that calls an ifunc, the prelinker reports
  an error of the form "Conflict ... not found in any relocation"

Version-Release number of selected component (if applicable):

  prelink-0.5.0-1.fc19.s390x

How reproducible:

  sudo prelink /usr/bin/ls

Actual results:

  prelink: /usr/bin/ls: Conflict 00000b78 not found in any relocation
  prelink: /usr/bin/ls: Conflict 00000938 not found in any relocation

Additional info:

  This seems to be caused by an early-out in s390_prelink_conflict_rela:

    if (GELF_R_TYPE (rela->r_info) == R_390_RELATIVE
        || GELF_R_TYPE (rela->r_info) == R_390_NONE
        || info->dso == dso)
      /* Fast path: nothing to do.  */
      return 0;

  where "info->dso == dso" means that relocations in the executable are
  ignored, even if against ifuncs.

  The attached patch structures the function in a similar way to x86_64.
  With this, no conflict errors are reported for "prelink -a".

  The patch makes the same change to 32-bit s390, but I haven't tested that.

Comment 1 Jakub Jelinek 2013-09-30 20:07:44 UTC
Looks correct, committed as r207 to prelink SVN.  Will try to add a testcase tomorrow.

Comment 2 Jakub Jelinek 2013-10-01 09:19:59 UTC
I've also committed s390 and s390x additions to testsuite/ifunc.h, with r207 reverted all the ifunc* tests FAIL on s390x, with r207 they all pass.

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