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32612615c5
The audit symbind callback is not called for binaries built with -Wl,-z,now or when LD_BIND_NOW=1 is used, nor the PLT tracking callbacks (plt_enter and plt_exit) since this would change the expected program semantics (where no PLT is expected) and would have performance implications (such as for BZ#15533). LAV_CURRENT is also bumped to indicate the audit ABI change (where la_symbind flags are set by the loader to indicate no possible PLT trace). To handle powerpc64 ELFv1 function descriptor, _dl_audit_symbind requires to know whether bind-now is used so the symbol value is updated to function text segment instead of the OPD (for lazy binding this is done by PPC64_LOAD_FUNCPTR on _dl_runtime_resolve). Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, powerpc64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/* Audit modules for tst-audit24a.
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Copyright (C) 2022 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 <link.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <string.h>
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#include <tst-auditmod24.h>
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#define AUDIT24_COOKIE 0x1
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#define AUDIT24MOD1_COOKIE 0x2
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#define AUDIT24MOD2_COOKIE 0x3
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#ifndef TEST_NAME
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# define TEST_NAME "tst-audit24a"
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#endif
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#ifndef TEST_MOD
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# define TEST_MOD TEST_NAME
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#endif
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#ifndef TEST_FUNC
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# define TEST_FUNC "tst_audit24a"
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#endif
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unsigned int
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la_version (unsigned int version)
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{
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return LAV_CURRENT;
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}
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unsigned int
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la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
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{
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const char *p = strrchr (map->l_name, '/');
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const char *l_name = p == NULL ? TEST_NAME : p + 1;
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uintptr_t ck = -1;
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if (strcmp (l_name, TEST_MOD "mod1.so") == 0)
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ck = AUDIT24MOD1_COOKIE;
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else if (strcmp (l_name, TEST_MOD "mod2.so") == 0)
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ck = AUDIT24MOD2_COOKIE;
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else if (strcmp (l_name, TEST_NAME) == 0)
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ck = AUDIT24_COOKIE;
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*cookie = ck;
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return ck == -1 ? 0 : LA_FLG_BINDFROM | LA_FLG_BINDTO;
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}
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static int
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tst_func1 (void)
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{
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return 1;
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}
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static int
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tst_func2 (void)
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{
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return 10;
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}
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#if __ELF_NATIVE_CLASS == 64
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uintptr_t
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la_symbind64 (Elf64_Sym *sym, unsigned int ndx,
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uintptr_t *refcook, uintptr_t *defcook,
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unsigned int *flags, const char *symname)
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#else
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uintptr_t
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la_symbind32 (Elf32_Sym *sym, unsigned int ndx,
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uintptr_t *refcook, uintptr_t *defcook,
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unsigned int *flags, const char *symname)
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#endif
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{
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if (*refcook == AUDIT24_COOKIE)
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{
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if (*defcook == AUDIT24MOD1_COOKIE)
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{
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/* Check if bind-now symbols are advertised to not call the PLT
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hooks. */
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test_symbind_flags (*flags);
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if (strcmp (symname, TEST_FUNC "mod1_func1") == 0)
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return (uintptr_t) tst_func1;
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else if (strcmp (symname, TEST_FUNC "mod1_func2") == 0)
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return sym->st_value;
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abort ();
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}
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if (*defcook == AUDIT24MOD2_COOKIE
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&& (strcmp (symname, TEST_FUNC "mod2_func1") == 0))
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{
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test_symbind_flags (*flags);
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return (uintptr_t) tst_func2;
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}
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/* malloc functions. */
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return sym->st_value;
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}
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abort ();
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}
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