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author | kib <kib@FreeBSD.org> | 2012-07-15 10:53:48 +0000 |
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committer | kib <kib@FreeBSD.org> | 2012-07-15 10:53:48 +0000 |
commit | a78a2e3c36e31109393e2a502b2f8f54f3a7f8d0 (patch) | |
tree | bbdaeedcb61722e97f659e43f80ef46bc3c33597 /libexec/rtld-elf/rtld.h | |
parent | 4d945ad412911425ef9b9dcb54ae11c825cd2bf7 (diff) | |
download | FreeBSD-src-a78a2e3c36e31109393e2a502b2f8f54f3a7f8d0.zip FreeBSD-src-a78a2e3c36e31109393e2a502b2f8f54f3a7f8d0.tar.gz |
Import the DragonFly BSD commit 4f0bc915b65fcf5a23214f6d221d65c80be68ad4
by John Marino <draco@marino.st>, with the following (edited) commit
message
Date: Sat, 24 Mar 2012 06:40:50 +0100
Subject: [PATCH 1/1] rtld: Implement DT_RUNPATH and -z nodefaultlib
DT_RUNPATH is incorrectly being considered as an alias of DT_RPATH. The
purpose of DT_RUNPATH is to have two different types of rpath: one that
can be overridden by the environment variable LD_LIBRARY_PATH and one that
can't. With the currently implementation, LD_LIBRARY_PATH will always
trump any embedded rpath or runpath tags.
Current path search order by rtld:
==================================
LD_LIBRARY_PATH
DT_RPATH / DT_RUNPATH (always the same)
ldconfig hints file (default: /var/run/ld-elf.so.hints)
/usr/lib
New path search order by rtld:
==============================
DT_RPATH of the calling object if no DT_RUNPATH
DT_RPATH of the main binary if no DT_RUNPATH and binary isn't calling obj
LD_LIBRARY_PATH
DT_RUNPATH
ldconfig hints file
/usr/lib
The new path search matches how the linux runtime loader works. The other
major added feature is support for linker flag "-z nodefaultlib". When
this flag is passed to the linker, rtld will skip all references to the
standard library search path ("/usr/lib" in this case but it could handle
more color delimited paths) except in DT_RPATH and DT_RUNPATH.
New path search order by rtld with -z nodefaultlib flag set:
============================================================
DT_RPATH of the calling object if no DT_RUNPATH
DT_RPATH of the main binary if no DT_RUNPATH and binary isn't calling obj
LD_LIBRARY_PATH
DT_RUNPATH
ldconfig hints file (skips all references to /usr/lib)
FreeBSD notes:
- we fixed some bugs which were submitted to DragonFly and merged there
as commit 1ff8a2bd3eb6e5587174c6a983303ea3a79e0002;
- we added LD_LIBRARY_PATH_RPATH environment variable to switch to
the previous behaviour of considering DT_RPATH a synonym for DT_RUNPATH;
- the FreeBSD default search path is /lib:/usr/lib and not /usr/lib.
Reviewed by: kan
MFC after: 1 month
MFC note: flip the ld_library_path_rpath default value for stable/9
Diffstat (limited to 'libexec/rtld-elf/rtld.h')
-rw-r--r-- | libexec/rtld-elf/rtld.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libexec/rtld-elf/rtld.h b/libexec/rtld-elf/rtld.h index 47389fe..0aba7cd 100644 --- a/libexec/rtld-elf/rtld.h +++ b/libexec/rtld-elf/rtld.h @@ -222,6 +222,7 @@ typedef struct Struct_Obj_Entry { const Elf_Hashelt *chain_zero_gnu; /* GNU hash table value array (Zeroed) */ char *rpath; /* Search path specified in object */ + char *runpath; /* Search path with different priority */ Needed_Entry *needed; /* Shared objects needed by this one (%) */ Needed_Entry *needed_filtees; Needed_Entry *needed_aux_filtees; @@ -258,6 +259,7 @@ typedef struct Struct_Obj_Entry { bool z_nodelete : 1; /* Do not unload the object and dependencies */ bool z_noopen : 1; /* Do not load on dlopen */ bool z_loadfltr : 1; /* Immediately load filtees */ + bool z_nodeflib : 1; /* Don't search default library path */ bool ref_nodel : 1; /* Refcount increased to prevent dlclose */ bool init_scanned: 1; /* Object is already on init list. */ bool on_fini_list: 1; /* Object is already on fini list. */ @@ -321,6 +323,14 @@ struct Struct_RtldLockState { sigjmp_buf env; }; +struct fill_search_info_args { + int request; + unsigned int flags; + struct dl_serinfo *serinfo; + struct dl_serpath *serpath; + char *strspace; +}; + /* * The pack of arguments and results for the symbol lookup functions. */ |