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Set NODELETE flag when opening already open objects with RTLD_NODELETE
The DF_1_NODELETE flag is set too late when opening a DSO, due to which, if a DSO is already open, subsequently opening it with RTLD_NODELETE fails to set the DF_1_NODELETE flag. This patch fixes this by setting the flag immediately after bumping the opencount. Verified on x86_64. [BZ #18676] * elf/tst-nodelete-opened.c: New test case. * elf/tst-nodelete-opened-lib.c: New test case module. * elf/Makefile (tests, modules-names): Use them. * elf/dl-open.c (dl_open_worker): Set DF_1_NODELETE flag early.
This commit is contained in:
Siddhesh Poyarekar
parent
c59f721c73
commit
b632bdd3f7
@ -1,3 +1,12 @@
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2015-07-16 Siddhesh Poyarekar <siddhesh@redhat.com>
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[BZ #18676]
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* elf/tst-nodelete-opened.c: New test case.
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* elf/tst-nodelete-opened-lib.c: New test case module.
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* elf/Makefile (tests, modules-names): Use them.
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* elf/dl-open.c (dl_open_worker): Set DF_1_NODELETE flag
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early.
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2015-07-15 David S. Miller <davem@davemloft.net>
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* sysdeps/sparc/nptl/pthread_barrier_init.c: Include
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2
NEWS
2
NEWS
@ -27,7 +27,7 @@ Version 2.22
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18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18536, 18539,
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18540, 18542, 18544, 18545, 18546, 18547, 18549, 18553, 18557, 18558,
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18569, 18583, 18585, 18586, 18592, 18593, 18594, 18602, 18612, 18613,
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18619, 18633, 18641, 18643, 18648.
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18619, 18633, 18641, 18643, 18648, 18676.
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* Cache information can be queried via sysconf() function on s390 e.g. with
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_SC_LEVEL1_ICACHE_SIZE as argument.
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@ -148,7 +148,7 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
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tst-unique1 tst-unique2 $(if $(CXX),tst-unique3 tst-unique4 \
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tst-nodelete) \
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tst-initorder tst-initorder2 tst-relsort1 tst-null-argv \
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tst-ptrguard1 tst-tlsalign tst-tlsalign-extern
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tst-ptrguard1 tst-tlsalign tst-tlsalign-extern tst-nodelete-opened
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# reldep9
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ifeq ($(build-hardcoded-path-in-tests),yes)
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tests += tst-dlopen-aout
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@ -218,7 +218,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
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tst-initorder2d \
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tst-relsort1mod1 tst-relsort1mod2 tst-array2dep \
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tst-array5dep tst-null-argv-lib \
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tst-tlsalign-lib
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tst-tlsalign-lib tst-nodelete-opened-lib
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ifeq (yes,$(have-protected-data))
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modules-names += tst-protected1moda tst-protected1modb
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tests += tst-protected1a tst-protected1b
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@ -525,6 +525,8 @@ $(objpfx)tst-initordera4.so: $(objpfx)tst-initordera3.so
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$(objpfx)tst-initorder: $(objpfx)tst-initordera4.so $(objpfx)tst-initordera1.so $(objpfx)tst-initorderb2.so
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$(objpfx)tst-null-argv: $(objpfx)tst-null-argv-lib.so
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$(objpfx)tst-tlsalign: $(objpfx)tst-tlsalign-lib.so
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$(objpfx)tst-nodelete-opened.out: $(objpfx)tst-nodelete-opened-lib.so
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$(objpfx)tst-nodelete-opened: $(libdl)
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$(objpfx)tst-tlsalign-extern: $(objpfx)tst-tlsalign-vars.o
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$(objpfx)tst-tlsalign-extern-static: $(objpfx)tst-tlsalign-vars.o
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@ -226,6 +226,12 @@ dl_open_worker (void *a)
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args->map = new = _dl_map_object (call_map, file, lt_loaded, 0,
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mode | __RTLD_CALLMAP, args->nsid);
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/* Mark the object as not deletable if the RTLD_NODELETE flags was passed.
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Do this early so that we don't skip marking the object if it was
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already loaded. */
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if (__glibc_unlikely (mode & RTLD_NODELETE))
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new->l_flags_1 |= DF_1_NODELETE;
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/* If the pointer returned is NULL this means the RTLD_NOLOAD flag is
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set and the object is not already loaded. */
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if (new == NULL)
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@ -564,11 +570,6 @@ TLS generation counter wrapped! Please report this."));
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/* It failed. */
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return;
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/* Mark the object as not deletable if the RTLD_NODELETE flags was
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passed. */
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if (__glibc_unlikely (mode & RTLD_NODELETE))
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new->l_flags_1 |= DF_1_NODELETE;
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#ifndef SHARED
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/* We must be the static _dl_open in libc.a. A static program that
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has loaded a dynamic object now has competition. */
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19
elf/tst-nodelete-opened-lib.c
Normal file
19
elf/tst-nodelete-opened-lib.c
Normal file
@ -0,0 +1,19 @@
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/* Verify that objects opened with RTLD_NODELETE are not unloaded - the DSO.
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Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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int foo_var = 42;
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67
elf/tst-nodelete-opened.c
Normal file
67
elf/tst-nodelete-opened.c
Normal file
@ -0,0 +1,67 @@
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/* Verify that an already opened DSO opened agained with RTLD_NODELETE actually
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sets the NODELETE flag.
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Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <stdio.h>
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int
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do_test (void)
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{
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void *h1 = dlopen ("$ORIGIN/tst-nodelete-opened-lib.so", RTLD_LAZY);
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if (h1 == NULL)
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{
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printf ("h1: failed to open DSO: %s\n", dlerror ());
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return 1;
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}
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void *h2 = dlopen ("$ORIGIN/tst-nodelete-opened-lib.so",
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RTLD_LAZY | RTLD_NODELETE);
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if (h2 == NULL)
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{
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printf ("h2: failed to open DSO: %s\n", dlerror ());
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return 1;
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}
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int *foo = dlsym (h2, "foo_var");
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if (foo == NULL)
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{
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printf ("failed to load symbol foo_var: %s\n", dlerror ());
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return 1;
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}
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if (dlclose (h1) != 0)
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{
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printf ("h1: dlclose failed: %s\n", dlerror ());
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return 1;
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}
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if (dlclose (h2) != 0)
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{
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printf ("h2: dlclose failed: %s\n", dlerror ());
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return 1;
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}
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printf ("foo == %d\n", *foo);
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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