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/* Check for expected la_objopen and la_objeclose for all objects.
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 <array_length.h>
#include <errno.h>
#include <getopt.h>
#include <link.h>
#include <limits.h>
#include <inttypes.h>
#include <gnu/lib-names.h>
#include <string.h>
#include <stdlib.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/xstdio.h>
#include <support/xdlfcn.h>
#include <support/support.h>
static int restart;
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
static int
handle_restart (void)
{
xdlopen ("tst-audit23mod.so", RTLD_NOW);
xdlmopen (LM_ID_NEWLM, LIBC_SO, RTLD_NOW);
return 0;
}
static inline bool
startswith (const char *str, const char *pre)
{
size_t lenpre = strlen (pre);
size_t lenstr = strlen (str);
return lenstr >= lenpre && memcmp (pre, str, lenpre) == 0;
}
static inline bool
is_vdso (const char *str)
{
return startswith (str, "linux-gate")
|| startswith (str, "linux-vdso");
}
static int
do_test (int argc, char *argv[])
{
/* We must have either:
- One or four parameters left if called initially:
+ path to ld.so optional
+ "--library-path" optional
+ the library path optional
+ the application name */
if (restart)
return handle_restart ();
char *spargv[9];
TEST_VERIFY_EXIT (((argc - 1) + 3) < array_length (spargv));
int i = 0;
for (; i < argc - 1; i++)
spargv[i] = argv[i + 1];
spargv[i++] = (char *) "--direct";
spargv[i++] = (char *) "--restart";
spargv[i] = NULL;
setenv ("LD_AUDIT", "tst-auditmod23.so", 0);
struct support_capture_subprocess result
= support_capture_subprogram (spargv[0], spargv);
support_capture_subprocess_check (&result, "tst-audit22", 0, sc_allow_stderr);
/* The expected la_objopen/la_objclose:
1. executable
2. loader
3. libc.so
4. tst-audit23mod.so
5. libc.so (LM_ID_NEWLM).
6. vdso (optional and ignored). */
enum { max_objs = 6 };
struct la_obj_t
{
char *lname;
uintptr_t laddr;
Lmid_t lmid;
bool closed;
} objs[max_objs] = { [0 ... max_objs-1] = { .closed = false } };
size_t nobjs = 0;
/* The expected namespaces are one for the audit module, one for the
application, and another for the dlmopen on handle_restart. */
enum { max_ns = 3 };
uintptr_t acts[max_ns] = { 0 };
size_t nacts = 0;
int last_act = -1;
uintptr_t last_act_cookie = -1;
bool seen_first_objclose = false;
FILE *out = fmemopen (result.err.buffer, result.err.length, "r");
TEST_VERIFY (out != NULL);
char *buffer = NULL;
size_t buffer_length = 0;
while (xgetline (&buffer, &buffer_length, out))
{
if (startswith (buffer, "la_activity: "))
{
uintptr_t cookie;
int this_act;
int r = sscanf (buffer, "la_activity: %d %"SCNxPTR"", &this_act,
&cookie);
TEST_COMPARE (r, 2);
/* The cookie identifies the object at the head of the link map,
so we only add a new namespace if it changes from the previous
one. This works since dlmopen is the last in the test body. */
if (cookie != last_act_cookie && last_act_cookie != -1)
TEST_COMPARE (last_act, LA_ACT_CONSISTENT);
if (this_act == LA_ACT_ADD && acts[nacts] != cookie)
{
acts[nacts++] = cookie;
last_act_cookie = cookie;
}
/* The LA_ACT_DELETE is called in the reverse order of LA_ACT_ADD
at program termination (if the tests adds a dlclose or a library
with extra dependencies this will need to be adapted). */
else if (this_act == LA_ACT_DELETE)
{
last_act_cookie = acts[--nacts];
TEST_COMPARE (acts[nacts], cookie);
acts[nacts] = 0;
}
else if (this_act == LA_ACT_CONSISTENT)
{
TEST_COMPARE (cookie, last_act_cookie);
/* LA_ACT_DELETE must always be followed by an la_objclose. */
if (last_act == LA_ACT_DELETE)
TEST_COMPARE (seen_first_objclose, true);
else
TEST_COMPARE (last_act, LA_ACT_ADD);
}
last_act = this_act;
seen_first_objclose = false;
}
else if (startswith (buffer, "la_objopen: "))
{
char *lname;
uintptr_t laddr;
Lmid_t lmid;
uintptr_t cookie;
int r = sscanf (buffer, "la_objopen: %"SCNxPTR" %ms %"SCNxPTR" %ld",
&cookie, &lname, &laddr, &lmid);
TEST_COMPARE (r, 4);
/* la_objclose is not triggered by vDSO because glibc does not
unload it. */
if (is_vdso (lname))
continue;
if (nobjs == max_objs)
FAIL_EXIT1 ("non expected la_objopen: %s %"PRIxPTR" %ld",
lname, laddr, lmid);
objs[nobjs].lname = lname;
objs[nobjs].laddr = laddr;
objs[nobjs].lmid = lmid;
objs[nobjs].closed = false;
nobjs++;
/* This indirectly checks that la_objopen always comes before
la_objclose btween la_activity calls. */
seen_first_objclose = false;
}
else if (startswith (buffer, "la_objclose: "))
{
char *lname;
uintptr_t laddr;
Lmid_t lmid;
uintptr_t cookie;
int r = sscanf (buffer, "la_objclose: %"SCNxPTR" %ms %"SCNxPTR" %ld",
&cookie, &lname, &laddr, &lmid);
TEST_COMPARE (r, 4);
for (size_t i = 0; i < nobjs; i++)
{
if (strcmp (lname, objs[i].lname) == 0 && lmid == objs[i].lmid)
{
TEST_COMPARE (objs[i].closed, false);
objs[i].closed = true;
break;
}
}
/* la_objclose should be called after la_activity(LA_ACT_DELETE) for
the closed object's namespace. */
TEST_COMPARE (last_act, LA_ACT_DELETE);
if (!seen_first_objclose)
{
TEST_COMPARE (last_act_cookie, cookie);
seen_first_objclose = true;
}
}
}
for (size_t i = 0; i < nobjs; i++)
{
TEST_COMPARE (objs[i].closed, true);
free (objs[i].lname);
}
/* la_activity(LA_ACT_CONSISTENT) should be the last callback received.
Since only one link map may be not-CONSISTENT at a time, this also
ensures la_activity(LA_ACT_CONSISTENT) is the last callback received
for every namespace. */
TEST_COMPARE (last_act, LA_ACT_CONSISTENT);
free (buffer);
xfclose (out);
return 0;
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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