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[glibc/fw/elf-fixups] Introduce DL_LOOKUP_FOR_RELOCATE flag for _dl_lookup_symbol_x


https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=10c5d5518cd6a90f8e541194889a38061acc7951

commit 10c5d5518cd6a90f8e541194889a38061acc7951
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Oct 29 12:23:48 2019 +0100

    Introduce DL_LOOKUP_FOR_RELOCATE flag for _dl_lookup_symbol_x
    
    This will allow changes in dependency processing during non-lazy
    binding, for more precise processing of NODELETE objects: During
    initial relocation in dlopen, the fate of NODELETE objects is still
    unclear, so objects which are depended upon by NODELETE objects
    cannot immediately be marked as NODELETE.

Diff:
---
 elf/dl-reloc.c             | 3 ++-
 sysdeps/generic/ldsodefs.h | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/elf/dl-reloc.c b/elf/dl-reloc.c
index 725a074..7f201fe 100644
--- a/elf/dl-reloc.c
+++ b/elf/dl-reloc.c
@@ -244,7 +244,8 @@ _dl_relocate_object (struct link_map *l, struct r_scope_elem *scope[],
 	       v = (version);						      \
 	     _lr = _dl_lookup_symbol_x (strtab + (*ref)->st_name, l, (ref),   \
 					scope, v, _tc,			      \
-					DL_LOOKUP_ADD_DEPENDENCY, NULL);      \
+					DL_LOOKUP_ADD_DEPENDENCY	      \
+					| DL_LOOKUP_FOR_RELOCATE, NULL);      \
 	     l->l_lookup_cache.ret = (*ref);				      \
 	     l->l_lookup_cache.value = _lr; }))				      \
      : l)
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index f3ba13e..7d5b80d 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -914,6 +914,9 @@ enum
     DL_LOOKUP_RETURN_NEWEST = 2,
     /* Set if dl_lookup* called with GSCOPE lock held.  */
     DL_LOOKUP_GSCOPE_LOCK = 4,
+    /* Set if dl_lookup is called for non-lazy relocation processing
+       from _dl_relocate_object in elf/dl-reloc.c.  */
+    DL_LOOKUP_FOR_RELOCATE = 8,
   };
 
 /* Lookup versioned symbol.  */


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