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/* Check DTAUDIT and vDSO interaction.
Copyright (C) 2021-2024 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 <errno.h>
#include <getopt.h>
#include <limits.h>
#include <inttypes.h>
#include <string.h>
#include <stdlib.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/xstdio.h>
#include <support/support.h>
#include <sys/auxv.h>
static int restart;
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
static uintptr_t vdso_addr;
static int
handle_restart (void)
{
fprintf (stderr, "vdso: %p\n", (void*) vdso_addr);
return 0;
}
static uintptr_t
parse_address (const char *str)
{
void *r;
TEST_COMPARE (sscanf (str, "%p\n", &r), 1);
return (uintptr_t) r;
}
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 int
do_test (int argc, char *argv[])
{
vdso_addr = getauxval (AT_SYSINFO_EHDR);
if (vdso_addr == 0)
FAIL_UNSUPPORTED ("getauxval (AT_SYSINFO_EHDR) returned 0");
/* We must have either:
- One our fource 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];
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-auditmod22.so", 0);
struct support_capture_subprocess result
= support_capture_subprogram (spargv[0], spargv, NULL);
support_capture_subprocess_check (&result, "tst-audit22", 0, sc_allow_stderr);
/* The respawned process should always print the vDSO address (otherwise it
will fails as unsupported). However, on some architectures the audit
module might see the vDSO with l_addr being 0, meaning a fixed mapping
(linux-gate.so). In this case we don't check its value against
AT_SYSINFO_EHDR one. */
uintptr_t vdso_process = 0;
bool vdso_audit_found = false;
uintptr_t vdso_audit = 0;
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, "vdso: "))
vdso_process = parse_address (buffer + strlen ("vdso: "));
else if (startswith (buffer, "vdso found: "))
{
vdso_audit = parse_address (buffer + strlen ("vdso found: "));
vdso_audit_found = true;
}
}
TEST_COMPARE (vdso_audit_found, true);
if (vdso_audit != 0)
TEST_COMPARE (vdso_process, vdso_audit);
free (buffer);
xfclose (out);
return 0;
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
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