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9e94f57484
On hppa, a function pointer returned by la_symbind is actually a function
descriptor has the plabel bit set (bit 30). This must be cleared to get
the actual address of the descriptor. If the descriptor has been bound,
the first word of the descriptor is the physical address of theA function,
otherwise, the first word of the descriptor points to a trampoline in the
PLT.
This patch also adds a workaround on tests because on hppa (and it seems
to be the only ABI I have see it), some shared library adds a dynamic PLT
relocation to am empty symbol name:
$ readelf -r elf/tst-audit25mod1.so
[...]
Relocation section '.rela.plt' at offset 0x464 contains 6 entries:
Offset Info Type Sym.Value Sym. Name + Addend
00002008 00000081 R_PARISC_IPLT 508
[...]
It breaks some assumptions on the test, where a symbol with an empty
name ("") is passed on la_symbind.
Checked on x86_64-linux-gnu and hppa-linux-gnu.
117 lines
2.8 KiB
C
117 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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if (symname[0] != '\0')
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abort ();
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return sym->st_value;
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}
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