[v3,03/20] elf: Do not fail for failed dlopem on audit modules (BZ #28061)
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Commit Message
The dl_main() sets the LM_ID_BASE to RT_ADD just before starting to
load new shared objects. The state is set to R_CONSISTENT just after
all objects are loaded.
However if a audit modules tries to dlmopen() an inexistent module,
the _dl_open() will assert that the namespace is in an inconsistent
state.
This is different than dlopen(), since it will not use LM_ID_BASE and
_dl_map_object_from_fd() is the sole responsible to set and reset the
r_state value.
So the assert() on _dl_open() can not really see if the state is
consistent since it is _dt_main() that reset is. This patch removes
the assert.
Checked on x86_64-linux-gnu.
---
elf/Makefile | 5 ++++
elf/dl-open.c | 2 --
elf/tst-audit19.c | 25 +++++++++++++++++++
elf/tst-auditmod19.c | 57 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 87 insertions(+), 2 deletions(-)
create mode 100644 elf/tst-audit19.c
create mode 100644 elf/tst-auditmod19.c
@@ -221,6 +221,7 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
tst-filterobj tst-filterobj-dlopen tst-auxobj tst-auxobj-dlopen \
tst-audit14 tst-audit15 tst-audit16 tst-audit17 \
tst-audit18a tst-audit18b \
+ tst-audit19 \
tst-single_threaded tst-single_threaded-pthread \
tst-tls-ie tst-tls-ie-dlmopen argv0test \
tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask \
@@ -303,6 +304,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
tst-unique2mod1 tst-unique2mod2 \
tst-auditmod9a tst-auditmod9b \
tst-auditmod18a tst-auditmod18b tst-audit18bmod \
+ tst-auditmod19 \
$(if $(CXX),tst-unique3lib tst-unique3lib2 tst-unique4lib \
tst-nodelete-uniquemod tst-nodelete-rtldmod \
tst-nodelete-zmod \
@@ -1509,6 +1511,9 @@ $(objpfx)tst-audit18b.out: $(objpfx)tst-auditmod18b.so
$(objpfx)tst-audit18b: $(objpfx)tst-audit18bmod.so
tst-audit18b-ARGS = -- $(host-test-program-cmd)
+$(objpfx)tst-audit19.out: $(objpfx)tst-auditmod19.so
+tst-audit19-ENV = LD_AUDIT=$(objpfx)tst-auditmod19.so
+
# tst-sonamemove links against an older implementation of the library.
LDFLAGS-tst-sonamemove-linkmod1.so = \
-Wl,--version-script=tst-sonamemove-linkmod1.map \
@@ -899,8 +899,6 @@ no more namespaces available for dlmopen()"));
the flag here. */
}
- assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);
-
/* Release the lock. */
__rtld_lock_unlock_recursive (GL(dl_load_lock));
new file mode 100644
@@ -0,0 +1,25 @@
+/* Check dlopen failure on audit modules.
+ Copyright (C) 2021 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/>. */
+
+static int
+do_test (void)
+{
+ return 0;
+}
+
+#include <support/test-driver.c>
new file mode 100644
@@ -0,0 +1,57 @@
+/* Check dlopen failure on audit modules.
+ Copyright (C) 2021 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 <dlfcn.h>
+#include <link.h>
+#include <stdlib.h>
+
+unsigned int
+la_version (unsigned int v)
+{
+ return LAV_CURRENT;
+}
+
+static void
+check (void)
+{
+ {
+ void *mod = dlopen ("nonexistent.so", RTLD_NOW);
+ if (mod != NULL)
+ abort ();
+ }
+
+ {
+ void *mod = dlmopen (LM_ID_BASE, "nonexistent.so", RTLD_NOW);
+ if (mod != NULL)
+ abort ();
+ }
+}
+
+void
+la_activity (uintptr_t *cookie, unsigned int flag)
+{
+ if (flag != LA_ACT_CONSISTENT)
+ return;
+ check ();
+}
+
+void
+la_preinit (uintptr_t *cookie)
+{
+ check ();
+}