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https://sourceware.org/git/glibc.git
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01196393c2
The _dl_read_only_area function in the uninitialized ld.so after
static dlopen is not able to find anything. Instead, we need to
redirect to the code from the statically linked main program.
Fixes commit d60fffe28a46b2a41fc308c1804ff02375d27408 ("debug:
Improve '%n' fortify detection (BZ 30932)").
Reviewed-by: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
86 lines
3.0 KiB
C
86 lines
3.0 KiB
C
/* Partial initialization of ld.so loaded via static dlopen.
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Copyright (C) 2021-2025 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 <assert.h>
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/* Very special case: This object is built into the static libc, but
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must know the layout of _rtld_global_ro. */
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#define SHARED
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#include <ldsodefs.h>
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#include <rtld_static_init.h>
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static const struct dlfcn_hook _dlfcn_hook =
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{
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.dlopen = __dlopen,
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.dlclose = __dlclose,
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.dlsym = __dlsym,
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.dlvsym = __dlvsym,
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.dlerror = __dlerror,
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.dladdr = __dladdr,
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.dladdr1 = __dladdr1,
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.dlinfo = __dlinfo,
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.dlmopen = __dlmopen,
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.libc_dlopen_mode = __libc_dlopen_mode,
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.libc_dlsym = __libc_dlsym,
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.libc_dlvsym = __libc_dlvsym,
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.libc_dlclose = __libc_dlclose,
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};
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void
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__rtld_static_init (struct link_map *map)
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{
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const ElfW(Sym) *sym
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= _dl_lookup_direct (map, "_rtld_global_ro",
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0x9f28436a, /* dl_new_hash output. */
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"GLIBC_PRIVATE",
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0x0963cf85); /* _dl_elf_hash output. */
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assert (sym != NULL);
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struct rtld_global_ro *dl = DL_SYMBOL_ADDRESS (map, sym);
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/* Perform partial initialization here. Note that this runs before
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ld.so is relocated, so only members initialized without
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relocations can be written here. */
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#ifdef HAVE_AUX_VECTOR
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extern __typeof (dl->_dl_auxv) _dl_auxv attribute_hidden;
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dl->_dl_auxv = _dl_auxv;
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extern __typeof (dl->_dl_clktck) _dl_clktck attribute_hidden;
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dl->_dl_clktck = _dl_clktck;
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#endif
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dl->_dl_dlfcn_hook = &_dlfcn_hook;
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extern __typeof (dl->_dl_hwcap) _dl_hwcap attribute_hidden;
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dl->_dl_hwcap = _dl_hwcap;
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extern __typeof (dl->_dl_hwcap2) _dl_hwcap2 attribute_hidden;
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dl->_dl_hwcap2 = _dl_hwcap2;
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extern __typeof (dl->_dl_minsigstacksize) _dl_minsigstacksize
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attribute_hidden;
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dl->_dl_minsigstacksize = _dl_minsigstacksize;
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extern __typeof (dl->_dl_pagesize) _dl_pagesize attribute_hidden;
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dl->_dl_pagesize = _dl_pagesize;
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extern __typeof (dl->_dl_tls_static_align) _dl_tls_static_align
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attribute_hidden;
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dl->_dl_tls_static_align = _dl_tls_static_align;
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extern __typeof (dl->_dl_tls_static_size) _dl_tls_static_size
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attribute_hidden;
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dl->_dl_tls_static_size = _dl_tls_static_size;
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dl->_dl_find_object = _dl_find_object;
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dl->_dl_readonly_area = _dl_readonly_area;
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__rtld_static_init_arch (map, dl);
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}
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