Look into ld_preloads before current library
Change lookup order during relocation so that
ld_preloads always precede caller (unless caller
is main executable).
Asan needs this change in order to intercept libc->libc
calls.
Bug: 15432753
(cherry picked from commit 05e190c093ad5b04691ed87100a711ef91f380b0)
Change-Id: I5bfb58e18015b1ec5b77842dbb37fb122fa1fd1a
diff --git a/linker/linker.cpp b/linker/linker.cpp
index 63c41c0..919f8c0 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -525,6 +525,15 @@
*lsi = si;
goto done;
}
+
+ /* Next, look for it in the preloads list */
+ for (int i = 0; g_ld_preloads[i] != NULL; i++) {
+ s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name);
+ if (s != NULL) {
+ *lsi = g_ld_preloads[i];
+ goto done;
+ }
+ }
} else {
/* Order of symbol lookup is controlled by DT_SYMBOLIC flag */
@@ -542,6 +551,15 @@
*lsi = somain;
goto done;
}
+
+ /* Next, look for it in the preloads list */
+ for (int i = 0; g_ld_preloads[i] != NULL; i++) {
+ s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name);
+ if (s != NULL) {
+ *lsi = g_ld_preloads[i];
+ goto done;
+ }
+ }
}
/* Look for symbols in the local scope (the object who is
@@ -573,16 +591,16 @@
*lsi = somain;
goto done;
}
- }
- }
- }
- /* Next, look for it in the preloads list */
- for (int i = 0; g_ld_preloads[i] != nullptr; i++) {
- s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name);
- if (s != nullptr) {
- *lsi = g_ld_preloads[i];
- goto done;
+ /* Next, look for it in the preloads list */
+ for (int i = 0; g_ld_preloads[i] != NULL; i++) {
+ s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name);
+ if (s != NULL) {
+ *lsi = g_ld_preloads[i];
+ goto done;
+ }
+ }
+ }
}
}