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[RFC,v7,17/20] dlsym, dlvsym should be able to look up symbols via DSO proxies

Message ID 20201216132650.22949-18-vivek@collabora.com
State New
Headers show
Series Implementation of RTLD_SHARED for dlmopen | expand

Commit Message

Vivek Das Mohapatra Dec. 16, 2020, 1:26 p.m. UTC
---
 elf/dl-sym.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
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Patch

diff --git a/elf/dl-sym.c b/elf/dl-sym.c
index 361b926ea9..4abd7eb3b4 100644
--- a/elf/dl-sym.c
+++ b/elf/dl-sym.c
@@ -96,6 +96,10 @@  do_sym (void *handle, const char *name, void *who,
     {
       match = _dl_sym_find_caller_link_map (caller);
 
+      /* Proxies don't contain any symbols: Need to look at the real DSO.  */
+      if (__glibc_unlikely (match->l_proxy))
+	match = match->l_real;
+
       /* Search the global scope.  We have the simple case where
 	 we look up in the scope of an object which was part of
 	 the initial binary.  And then the more complex part
@@ -140,6 +144,11 @@  RTLD_NEXT used in code not dynamically loaded"));
 	}
 
       struct link_map *l = match;
+
+      /* Proxies don't contain any symbols: Need to look at the real DSO.  */
+      if (__glibc_unlikely (l->l_proxy))
+	l = l->l_real;
+
       while (l->l_loader != NULL)
 	l = l->l_loader;
 
@@ -150,6 +159,11 @@  RTLD_NEXT used in code not dynamically loaded"));
     {
       /* Search the scope of the given object.  */
       struct link_map *map = handle;
+
+      /* Proxies don't contain any symbols: Need to look at the real DSO.  */
+      if (__glibc_unlikely (map->l_proxy))
+	map = map->l_real;
+
       result = GLRO(dl_lookup_symbol_x) (name, map, &ref, map->l_local_scope,
 					 vers, 0, flags, NULL);
     }