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glibc/glibc-rh2233338-2.patch
Florian Weimer 53877e8f4e Always call destructors in reverse constructor order (#2233338) 
Resolves: #2233338
2023-09-11 10:54:17 +02:00

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commit 6f360366f7f76b158a0f4bf20d42f2854ad56264
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu Oct 27 11:36:44 2022 +0200
elf: Introduce to _dl_call_fini
This consolidates the destructor invocations from _dl_fini and
dlclose. Remove the micro-optimization that avoids
calling _dl_call_fini if they are no destructors (as dlclose is quite
expensive anyway). The debug log message is now printed
unconditionally.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Conflicts:
elf/dl-fini.c
(Missing ELF_INITFINI support downstream.)
sysdeps/generic/ldsodefs.h
(Missing dl_init_t declaration downstream.)
diff --git a/elf/Makefile b/elf/Makefile
index 634c3113227d64a6..040d82e243a80c0f 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -50,6 +50,7 @@ routines = \
# profiled libraries.
dl-routines = \
dl-call-libc-early-init \
+ dl-call_fini \
dl-close \
dl-debug \
dl-deps \
diff --git a/elf/dl-call_fini.c b/elf/dl-call_fini.c
new file mode 100644
index 0000000000000000..9e7ba10fa2a4df77
--- /dev/null
+++ b/elf/dl-call_fini.c
@@ -0,0 +1,50 @@
+/* Invoke DT_FINI and DT_FINI_ARRAY callbacks.
+ Copyright (C) 1996-2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <ldsodefs.h>
+#include <sysdep.h>
+
+void
+_dl_call_fini (void *closure_map)
+{
+ struct link_map *map = closure_map;
+
+ /* When debugging print a message first. */
+ if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
+ _dl_debug_printf ("\ncalling fini: %s [%lu]\n\n", map->l_name, map->l_ns);
+
+ /* Make sure nothing happens if we are called twice. */
+ map->l_init_called = 0;
+
+ ElfW(Dyn) *fini_array = map->l_info[DT_FINI_ARRAY];
+ if (fini_array != NULL)
+ {
+ ElfW(Addr) *array = (ElfW(Addr) *) (map->l_addr
+ + fini_array->d_un.d_ptr);
+ size_t sz = (map->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
+ / sizeof (ElfW(Addr)));
+
+ while (sz-- > 0)
+ ((fini_t) array[sz]) ();
+ }
+
+ /* Next try the old-style destructor. */
+ ElfW(Dyn) *fini = map->l_info[DT_FINI];
+ if (fini != NULL)
+ DL_CALL_DT_FINI (map, ((void *) map->l_addr + fini->d_un.d_ptr));
+}
diff --git a/elf/dl-close.c b/elf/dl-close.c
index 22225efb3226c3e1..26ea51dfbadc5b85 100644
--- a/elf/dl-close.c
+++ b/elf/dl-close.c
@@ -35,11 +35,6 @@
#include <dl-unmap-segments.h>
-
-/* Type of the constructor functions. */
-typedef void (*fini_t) (void);
-
-
/* Special l_idx value used to indicate which objects remain loaded. */
#define IDX_STILL_USED -1
@@ -109,31 +104,6 @@ remove_slotinfo (size_t idx, struct dtv_slotinfo_list *listp, size_t disp,
return false;
}
-/* Invoke dstructors for CLOSURE (a struct link_map *). Called with
- exception handling temporarily disabled, to make errors fatal. */
-static void
-call_destructors (void *closure)
-{
- struct link_map *map = closure;
-
- if (map->l_info[DT_FINI_ARRAY] != NULL)
- {
- ElfW(Addr) *array =
- (ElfW(Addr) *) (map->l_addr
- + map->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
- unsigned int sz = (map->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
- / sizeof (ElfW(Addr)));
-
- while (sz-- > 0)
- ((fini_t) array[sz]) ();
- }
-
- /* Next try the old-style destructor. */
- if (map->l_info[DT_FINI] != NULL)
- DL_CALL_DT_FINI (map, ((void *) map->l_addr
- + map->l_info[DT_FINI]->d_un.d_ptr));
-}
-
void
_dl_close_worker (struct link_map *map, bool force)
{
@@ -279,17 +249,7 @@ _dl_close_worker (struct link_map *map, bool force)
half-cooked objects. Temporarily disable exception
handling, so that errors are fatal. */
if (imap->l_init_called)
- {
- /* When debugging print a message first. */
- if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS,
- 0))
- _dl_debug_printf ("\ncalling fini: %s [%lu]\n\n",
- imap->l_name, nsid);
-
- if (imap->l_info[DT_FINI_ARRAY] != NULL
- || imap->l_info[DT_FINI] != NULL)
- _dl_catch_exception (NULL, call_destructors, imap);
- }
+ _dl_catch_exception (NULL, _dl_call_fini, imap);
#ifdef SHARED
/* Auditing checkpoint: we remove an object. */
diff --git a/elf/dl-fini.c b/elf/dl-fini.c
index e14259a3c8806e0d..2d34658d4c3a470c 100644
--- a/elf/dl-fini.c
+++ b/elf/dl-fini.c
@@ -20,11 +20,6 @@
#include <string.h>
#include <ldsodefs.h>
-
-/* Type of the constructor functions. */
-typedef void (*fini_t) (void);
-
-
void
_dl_fini (void)
{
@@ -115,38 +110,7 @@ _dl_fini (void)
if (l->l_init_called)
{
- /* Make sure nothing happens if we are called twice. */
- l->l_init_called = 0;
-
- /* Is there a destructor function? */
- if (l->l_info[DT_FINI_ARRAY] != NULL
- || l->l_info[DT_FINI] != NULL)
- {
- /* When debugging print a message first. */
- if (__builtin_expect (GLRO(dl_debug_mask)
- & DL_DEBUG_IMPCALLS, 0))
- _dl_debug_printf ("\ncalling fini: %s [%lu]\n\n",
- DSO_FILENAME (l->l_name),
- ns);
-
- /* First see whether an array is given. */
- if (l->l_info[DT_FINI_ARRAY] != NULL)
- {
- ElfW(Addr) *array =
- (ElfW(Addr) *) (l->l_addr
- + l->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
- unsigned int i = (l->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
- / sizeof (ElfW(Addr)));
- while (i-- > 0)
- ((fini_t) array[i]) ();
- }
-
- /* Next try the old-style destructor. */
- if (l->l_info[DT_FINI] != NULL)
- DL_CALL_DT_FINI
- (l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr);
- }
-
+ _dl_call_fini (l);
#ifdef SHARED
/* Auditing checkpoint: another object closed. */
_dl_audit_objclose (l);
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 29bbde3e83e37d7e..0bad34d44a5685d9 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -93,6 +93,9 @@ typedef struct link_map *lookup_t;
: (__glibc_unlikely ((ref)->st_shndx == SHN_ABS) ? 0 \
: LOOKUP_VALUE_ADDRESS (map, map_set)) + (ref)->st_value)
+/* Type of a constructor function, in DT_FINI, DT_FINI_ARRAY. */
+typedef void (*fini_t) (void);
+
/* On some architectures a pointer to a function is not just a pointer
to the actual code of the function but rather an architecture
specific descriptor. */
@@ -1047,6 +1050,11 @@ extern void _dl_init (struct link_map *main_map, int argc, char **argv,
initializer functions have completed. */
extern void _dl_fini (void) attribute_hidden;
+/* Invoke the DT_FINI_ARRAY and DT_FINI destructors for MAP, which
+ must be a struct link_map *. Can be used as an argument to
+ _dl_catch_exception. */
+void _dl_call_fini (void *map) attribute_hidden;
+
/* Sort array MAPS according to dependencies of the contained objects.
If FORCE_FIRST, MAPS[0] keeps its place even if the dependencies
say otherwise. */
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