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[toolchain/eglibc] add patch for eglibc version 2.15 

This patch partially reverts an (e)glibc commit
which fixed a memory leak, however introduced lookup
errors in dlopen() with resulting segmentation faults
in certain scenarios.

References:
 - http://comments.gmane.org/gmane.comp.lib.glibc.user/1227
 - http://sourceware.org/ml/libc-alpha/2011-06/msg00006.html

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37029 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Mirko Vogt 2013-06-24 14:51:22 +00:00
parent 6d4d47f265
commit a7442fefce
1 changed files with 110 additions and 0 deletions
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110
toolchain/eglibc/patches/2.15/050-all_glibc-2.14-leak-revert-crash.patch Normal file
View File

@ -0,0 +1,110 @@
partially revert commit 4bff6e0175ed195871f4e01cc4c4c33274b8f6e3 - caused segmentation faults in dlopen
References:
http://comments.gmane.org/gmane.comp.lib.glibc.user/1227
http://sourceware.org/ml/libc-alpha/2011-06/msg00006.html
diff --git a/libc/elf/dl-close.c b/libc/elf/dl-close.c
index 4b17bf8..733cc1b 100644
--- a/libc/elf/dl-close.c
+++ b/libc/elf/dl-close.c
@@ -119,17 +119,8 @@ _dl_close_worker (struct link_map *map)
if (map->l_direct_opencount > 0 || map->l_type != lt_loaded
|| dl_close_state != not_pending)
{
- if (map->l_direct_opencount == 0)
- {
- if (map->l_type == lt_loaded)
- dl_close_state = rerun;
- else if (map->l_type == lt_library)
- {
- struct link_map **oldp = map->l_initfini;
- map->l_initfini = map->l_orig_initfini;
- _dl_scope_free (oldp);
- }
- }
+ if (map->l_direct_opencount == 0 && map->l_type == lt_loaded)
+ dl_close_state = rerun;
/* There are still references to this object. Do nothing more. */
if (__builtin_expect (GLRO_dl_debug_mask & DL_DEBUG_FILES, 0))
diff --git a/libc/elf/dl-deps.c b/libc/elf/dl-deps.c
index 51cb2fa..eddcbf0 100644
--- a/libc/elf/dl-deps.c
+++ b/libc/elf/dl-deps.c
@@ -489,6 +489,7 @@ _dl_map_object_deps (struct link_map *map,
nneeded * sizeof needed[0]);
atomic_write_barrier ();
l->l_initfini = l_initfini;
+ l->l_free_initfini = 1;
}
/* If we have no auxiliary objects just go on to the next map. */
@@ -689,6 +690,7 @@ Filters not supported with LD_TRACE_PRELINKING"));
l_initfini[nlist] = NULL;
atomic_write_barrier ();
map->l_initfini = l_initfini;
+ map->l_free_initfini = 1;
if (l_reldeps != NULL)
{
atomic_write_barrier ();
@@ -697,7 +699,7 @@ Filters not supported with LD_TRACE_PRELINKING"));
_dl_scope_free (old_l_reldeps);
}
if (old_l_initfini != NULL)
- map->l_orig_initfini = old_l_initfini;
+ _dl_scope_free (old_l_initfini);
if (errno_reason)
_dl_signal_error (errno_reason == -1 ? 0 : errno_reason, objname,
diff --git a/libc/elf/dl-libc.c b/libc/elf/dl-libc.c
index f44fa10..7563093 100644
--- a/libc/elf/dl-libc.c
+++ b/libc/elf/dl-libc.c
@@ -284,6 +284,10 @@ libc_freeres_fn (free_mem)
if (! old->dont_free)
free (old);
}
+
+ /* Free the initfini dependency list. */
+ if (l->l_free_initfini)
+ free (l->l_initfini);
}
if (__builtin_expect (GL(dl_ns)[ns]._ns_global_scope_alloc, 0) != 0
diff --git a/libc/elf/rtld.c b/libc/elf/rtld.c
index b93a01f..2fc83ce 100644
--- a/libc/elf/rtld.c
+++ b/libc/elf/rtld.c
@@ -2277,6 +2277,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
lnp->dont_free = 1;
lnp = lnp->next;
}
+ l->l_free_initfini = 0;
if (l != &GL(dl_rtld_map))
_dl_relocate_object (l, l->l_scope, GLRO(dl_lazy) ? RTLD_LAZY : 0,
diff --git a/libc/include/link.h b/libc/include/link.h
index e877104..b1b4065 100644
--- a/libc/include/link.h
+++ b/libc/include/link.h
@@ -192,6 +192,9 @@ struct link_map
during LD_TRACE_PRELINKING=1
contains any DT_SYMBOLIC
libraries. */
+ unsigned int l_free_initfini:1; /* Nonzero if l_initfini can be
+ freed, ie. not allocated with
+ the dummy malloc in ld.so. */
/* Collected information about own RPATH directories. */
struct r_search_path_struct l_rpath_dirs;
@@ -240,9 +243,6 @@ struct link_map
/* List of object in order of the init and fini calls. */
struct link_map **l_initfini;
- /* The init and fini list generated at startup, saved when the
- object is also loaded dynamically. */
- struct link_map **l_orig_initfini;
/* List of the dependencies introduced through symbol binding. */
struct link_map_reldeps