Red Hat Bugzilla – Bug 1010398
Executables that call ifuncs aren't prelinked on s390x
Last modified: 2015-02-18 06:14:03 EST
Created attachment 800586 [details]
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):
sudo prelink /usr/bin/ls
prelink: /usr/bin/ls: Conflict 00000b78 not found in any relocation
prelink: /usr/bin/ls: Conflict 00000938 not found in any relocation
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. */
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.
Looks correct, committed as r207 to prelink SVN. Will try to add a testcase tomorrow.
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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