mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-03 18:31:04 +00:00
056fc1c0e3
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>
(cherry picked from commit 32612615c5)
Resolved conflicts:
NEWS - Manual merge.
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/* Audit modules for tst-audit24b.
|
|
Copyright (C) 2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <link.h>
|
|
#include <inttypes.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <tst-auditmod24.h>
|
|
|
|
#define TEST_NAME "tst-audit24b"
|
|
#define TEST_FUNC "tst_audit24b"
|
|
|
|
#define AUDIT24_COOKIE 0x1
|
|
#define AUDIT24MOD1_COOKIE 0x2
|
|
#define AUDIT24MOD2_COOKIE 0x3
|
|
|
|
unsigned int
|
|
la_version (unsigned int version)
|
|
{
|
|
return LAV_CURRENT;
|
|
}
|
|
|
|
unsigned int
|
|
la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
|
|
{
|
|
const char *p = strrchr (map->l_name, '/');
|
|
const char *l_name = p == NULL ? TEST_NAME : p + 1;
|
|
|
|
uintptr_t ck = -1;
|
|
if (strcmp (l_name, TEST_NAME "mod1.so") == 0)
|
|
ck = AUDIT24MOD1_COOKIE;
|
|
else if (strcmp (l_name, TEST_NAME "mod2.so") == 0)
|
|
ck = AUDIT24MOD2_COOKIE;
|
|
else if (strcmp (l_name, TEST_NAME) == 0)
|
|
ck = AUDIT24_COOKIE;
|
|
|
|
*cookie = ck;
|
|
return ck == -1 ? 0 : LA_FLG_BINDFROM | LA_FLG_BINDTO;
|
|
}
|
|
|
|
static int
|
|
tst_func1 (void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
tst_func2 (void)
|
|
{
|
|
return 2;
|
|
}
|
|
|
|
#if __ELF_NATIVE_CLASS == 64
|
|
uintptr_t
|
|
la_symbind64 (Elf64_Sym *sym, unsigned int ndx,
|
|
uintptr_t *refcook, uintptr_t *defcook,
|
|
unsigned int *flags, const char *symname)
|
|
#else
|
|
uintptr_t
|
|
la_symbind32 (Elf32_Sym *sym, unsigned int ndx,
|
|
uintptr_t *refcook, uintptr_t *defcook,
|
|
unsigned int *flags, const char *symname)
|
|
#endif
|
|
{
|
|
if (*refcook == AUDIT24_COOKIE)
|
|
{
|
|
if (*defcook == AUDIT24MOD1_COOKIE)
|
|
{
|
|
if (strcmp (symname, TEST_FUNC "mod1_func1") == 0)
|
|
return (uintptr_t) tst_func1;
|
|
else if (strcmp (symname, TEST_FUNC "mod1_func2") == 0)
|
|
return sym->st_value;
|
|
abort ();
|
|
}
|
|
/* malloc functions. */
|
|
return sym->st_value;
|
|
}
|
|
else if (*refcook == AUDIT24MOD1_COOKIE)
|
|
{
|
|
if (*defcook == AUDIT24MOD2_COOKIE
|
|
&& (strcmp (symname, TEST_FUNC "mod2_func1") == 0))
|
|
{
|
|
test_symbind_flags (*flags);
|
|
return (uintptr_t) tst_func2;
|
|
}
|
|
}
|
|
|
|
abort ();
|
|
}
|