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a93d9e03a3
Glibc does not provide an interface for debugger to access libraries loaded in multiple namespaces via dlmopen. The current rtld-debugger interface is described in the file: elf/rtld-debugger-interface.txt under the "Standard debugger interface" heading. This interface only provides access to the first link-map (LM_ID_BASE). 1. Bump r_version to 2 when multiple namespaces are used. This triggers the GDB bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28236 2. Add struct r_debug_extended to extend struct r_debug into a linked-list, where each element correlates to an unique namespace. 3. Initialize the r_debug_extended structure. Bump r_version to 2 for the new namespace and add the new namespace to the namespace linked list. 4. Add _dl_debug_update to return the address of struct r_debug' of a namespace. 5. Add a hidden symbol, _r_debug_extended, for struct r_debug_extended. 6. Provide the symbol, _r_debug, with size of struct r_debug, as an alias of _r_debug_extended, for programs which reference _r_debug. This fixes BZ #15971. Reviewed-by: Florian Weimer <fweimer@redhat.com>
73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/* Test struct r_debug_extended via DT_DEBUG.
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Copyright (C) 2021 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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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <link.h>
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#include <stdlib.h>
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#include <string.h>
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#include <gnu/lib-names.h>
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#include <support/xdlfcn.h>
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#include <support/check.h>
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#include <support/test-driver.h>
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#ifndef ELF_MACHINE_GET_R_DEBUG
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# define ELF_MACHINE_GET_R_DEBUG(d) \
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(__extension__ ({ \
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struct r_debug_extended *debug; \
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if ((d)->d_tag == DT_DEBUG) \
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debug = (struct r_debug_extended *) (d)->d_un.d_ptr; \
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else \
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debug = NULL; \
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debug; }))
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#endif
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static int
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do_test (void)
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{
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ElfW(Dyn) *d;
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struct r_debug_extended *debug = NULL;
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for (d = _DYNAMIC; d->d_tag != DT_NULL; ++d)
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{
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debug = ELF_MACHINE_GET_R_DEBUG (d);
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if (debug != NULL)
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break;
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}
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TEST_VERIFY_EXIT (debug != NULL);
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TEST_COMPARE (debug->base.r_version, 1);
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TEST_VERIFY_EXIT (debug->r_next == NULL);
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void *h = xdlmopen (LM_ID_NEWLM, "$ORIGIN/tst-dlmopen1mod.so",
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RTLD_LAZY);
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TEST_COMPARE (debug->base.r_version, 2);
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TEST_VERIFY_EXIT (debug->r_next != NULL);
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TEST_VERIFY_EXIT (debug->r_next->r_next == NULL);
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TEST_VERIFY_EXIT (debug->r_next->base.r_map != NULL);
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TEST_VERIFY_EXIT (debug->r_next->base.r_map->l_name != NULL);
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const char *name = basename (debug->r_next->base.r_map->l_name);
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TEST_COMPARE_STRING (name, "tst-dlmopen1mod.so");
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xdlclose (h);
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return 0;
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}
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#include <support/test-driver.c>
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