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https://sourceware.org/bugzilla/show_bug.cgi?id=18778 If dlopen fails to load an object that has triggered loading libpthread it causes ld.so to unload libpthread because its DF_1_NODELETE flags has been forcefully cleared. The next call to __rtdl_unlock_lock_recursive will crash since pthread_mutex_unlock no longer exists. This patch moves l->l_flags_1 &= ~DF_1_NODELETE out of loop through all loaded libraries and performs the action only on inconsistent one. [BZ #18778] * elf/Makefile (tests): Add Add tst-nodelete2. (modules-names): Add tst-nodelete2mod. (tst-nodelete2mod.so-no-z-defs): New. ($(objpfx)tst-nodelete2): Likewise. ($(objpfx)tst-nodelete2.out): Likewise. (LDFLAGS-tst-nodelete2): Likewise. * elf/dl-close.c (_dl_close_worker): Move DF_1_NODELETE clearing out of loop through all loaded libraries. * elf/tst-nodelete2.c: New file. * elf/tst-nodelete2mod.c: Likewise.
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
#include "../dlfcn/dlfcn.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <gnu/lib-names.h>
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static int
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do_test (void)
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{
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int result = 0;
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printf ("\nOpening pthread library.\n");
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void *pthread = dlopen (LIBPTHREAD_SO, RTLD_LAZY);
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/* This is a test for correct DF_1_NODELETE clearing when dlopen failure
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happens. We should clear DF_1_NODELETE for failed library only, because
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doing this for others (e.g. libpthread) might cause them to be unloaded,
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that may lead to some global references (e.g. __rtld_lock_unlock) to be
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broken. The dlopen should fail because of undefined symbols in shared
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library, that cause DF_1_NODELETE to be cleared. For libpthread, this
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flag should be set, because if not, SIGSEGV will happen in dlclose. */
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if (dlopen ("tst-nodelete2mod.so", RTLD_NOW) != NULL)
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{
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printf ("Unique symbols test failed\n");
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result = 1;
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}
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if (pthread)
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dlclose (pthread);
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if (result == 0)
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printf ("SUCCESS\n");
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return result;
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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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