bin/149569: runtime linker unable to load needed object with the same name as referencing object

KT Sin ktsin at acm.org
Thu Aug 12 10:00:09 UTC 2010


>Number:         149569
>Category:       bin
>Synopsis:       runtime linker unable to load needed object with the same name as referencing object
>Confidential:   no
>Severity:       non-critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Aug 12 10:00:08 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     KT Sin
>Release:        8.1-RELEASE
>Organization:
>Environment:
FreeBSD passion.hsins.com 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 14:05:18 MYT 2010     ktsin at passion.hsins.com:/tmp/obj/usr/src/sys/PASSION  i386

>Description:
starting from freebsd 7, the runtime linker is unable to load needed object having the same name as the referencing object even though the needed object's rpath is set.

$ ldd ./libclntsh.so.9.0
./libclntsh.so.9.0:
        libclntsh.so.9.0 => ./libclntsh.so.9.0 (0x881a8000)

$ objdump -x ./libclntsh.so.9.0 | head -25

./libclntsh.so.9.0:     file format elf32-i386-freebsd
./libclntsh.so.9.0
architecture: i386, flags 0x00000150:
HAS_SYMS, DYNAMIC, D_PAGED
start address 0x00002700

Program Header:
    LOAD off    0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**12
         filesz 0x00002d20 memsz 0x00002d20 flags r-x
    LOAD off    0x00002d20 vaddr 0x00003d20 paddr 0x00003d20 align 2**12
         filesz 0x000000d8 memsz 0x000000fc flags rw-
 DYNAMIC off    0x00002d68 vaddr 0x00003d68 paddr 0x00003d68 align 2**2
         filesz 0x00000090 memsz 0x00000090 flags rw-
    NOTE off    0x00002d08 vaddr 0x00002d08 paddr 0x00002d08 align 2**2
         filesz 0x00000018 memsz 0x00000018 flags r--

Dynamic Section:
  NEEDED      libclntsh.so.9.0
  SONAME      libclntsh.so.9.0
  RPATH       /usr/local/test/oracle/lib
  INIT        0x26b0
  FINI        0x2d00
  HASH        0xb4
  STRTAB      0x153c

>How-To-Repeat:

>Fix:
proposed fix is attached.

after patching rtld.c and rebuilding ld-elf.so.1 :

$ ldd ./libclntsh.so.9.0
./libclntsh.so.9.0:
        libclntsh.so.9.0 => /usr/local/test/oracle/lib/libclntsh.so.9.0 (0x88300000)
        libwtc9.so => /usr/local/lib/libwtc9.so (0x881ac000)
        libm.so.2 => /usr/local/lib/libm.so.2 (0x881ae000)



Patch attached with submission follows:

--- libexec/rtld-elf/rtld.c.orig	2010-06-18 23:17:38.000000000 +0800
+++ libexec/rtld-elf/rtld.c	2010-08-12 16:16:43.000000000 +0800
@@ -1435,15 +1435,23 @@
 	Needed_Entry *needed;
 
 	for (needed = obj->needed;  needed != NULL;  needed = needed->next) {
-	    obj1 = needed->obj = load_object(obj->strtab + needed->name, obj,
-		flags & ~RTLD_LO_NOLOAD);
-	    if (obj1 == NULL && !ld_tracing)
+	    const char *name = obj->strtab + needed->name;
+	    char *path = find_library(name, obj);
+
+	    if (path == NULL && !ld_tracing)
 		return -1;
-	    if (obj1 != NULL && obj1->z_nodelete && !obj1->ref_nodel) {
-		dbg("obj %s nodelete", obj1->path);
-		init_dag(obj1);
-		ref_dag(obj1);
-		obj1->ref_nodel = true;
+
+	    if (path) {
+		obj1 = needed->obj = load_object(path, obj,
+		flags & ~RTLD_LO_NOLOAD);
+		if (obj1 == NULL && !ld_tracing)
+		    return -1;
+		if (obj1 != NULL && obj1->z_nodelete && !obj1->ref_nodel) {
+		    dbg("obj %s nodelete", obj1->path);
+		    init_dag(obj1);
+		    ref_dag(obj1);
+		    obj1->ref_nodel = true;
+		}
 	    }
 	}
     }


>Release-Note:
>Audit-Trail:
>Unformatted:


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