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8e1472d2c1
GLRO (_rtld_global_ro) is read-only after initialization and can therefore not be patched at run time, unlike the hook table addresses and their contents, so this is a desirable hardening feature. The hooks are only needed if ld.so has not been initialized, and this happens only after static dlopen (dlmopen uses a single ld.so object across all namespaces). Reviewed-by: Carlos O'Donell <carlos@redhat.com>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* Locate the shared object symbol nearest a given address.
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Copyright (C) 2003-2017 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 <ldsodefs.h>
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#if !defined SHARED && IS_IN (libdl)
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int
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dladdr1 (const void *address, Dl_info *info, void **extra, int flags)
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{
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return __dladdr1 (address, info, extra, flags);
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}
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#else
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int
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__dladdr1 (const void *address, Dl_info *info, void **extra, int flags)
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{
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# ifdef SHARED
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if (!rtld_active ())
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return _dlfcn_hook->dladdr1 (address, info, extra, flags);
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# endif
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switch (flags)
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{
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default: /* Make this an error? */
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case 0:
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return _dl_addr (address, info, NULL, NULL);
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case RTLD_DL_SYMENT:
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return _dl_addr (address, info, NULL, (const ElfW(Sym) **) extra);
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case RTLD_DL_LINKMAP:
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return _dl_addr (address, info, (struct link_map **) extra, NULL);
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}
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}
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# ifdef SHARED
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strong_alias (__dladdr1, dladdr1)
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# endif
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#endif
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