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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