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29496b3103
The rtld-audit interfaces introduces a slowdown due to enabling
profiling instrumentation (as if LD_AUDIT implied LD_PROFILE).
However, instrumenting is only necessary if one of audit libraries
provides PLT callbacks (la_pltenter or la_pltexit symbols). Otherwise,
the slowdown can be avoided.
The following patch adjusts the logic that enables profiling to iterate
over all audit modules and check if any of those provides a PLT hook.
To keep la_symbind to work even without PLT callbacks, _dl_fixup now
calls the audit callback if the modules implements it.
Co-authored-by: Alexander Monakov <amonakov@ispras.ru>
Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit 063f9ba220)
Resolved conflicts:
NEWS
elf/Makefile
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* Check if DT_AUDIT a module with la_plt{enter,exit} call la_symbind
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for lazy resolution.
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Copyright (C) 2021 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 <getopt.h>
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#include <support/capture_subprocess.h>
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#include <support/check.h>
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#include <support/xstdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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static int restart;
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#define CMDLINE_OPTIONS \
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{ "restart", no_argument, &restart, 1 },
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int tst_audit18bmod1_func (void);
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static int
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handle_restart (void)
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{
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TEST_COMPARE (tst_audit18bmod1_func (), 10);
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return 0;
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}
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static inline bool
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startswith (const char *str, const char *pre)
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{
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size_t lenpre = strlen (pre);
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size_t lenstr = strlen (str);
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return lenstr < lenpre ? false : memcmp (pre, str, lenpre) == 0;
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}
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static int
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do_test (int argc, char *argv[])
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{
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/* We must have either:
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- One our fource parameters left if called initially:
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+ path to ld.so optional
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+ "--library-path" optional
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+ the library path optional
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+ the application name */
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if (restart)
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return handle_restart ();
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char *spargv[9];
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int i = 0;
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for (; i < argc - 1; i++)
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spargv[i] = argv[i + 1];
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spargv[i++] = (char *) "--direct";
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spargv[i++] = (char *) "--restart";
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spargv[i] = NULL;
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setenv ("LD_AUDIT", "tst-auditmod18b.so", 0);
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struct support_capture_subprocess result
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= support_capture_subprogram (spargv[0], spargv);
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support_capture_subprocess_check (&result, "tst-audit18b", 0, sc_allow_stderr);
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bool find_symbind = false;
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FILE *out = fmemopen (result.err.buffer, result.err.length, "r");
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TEST_VERIFY (out != NULL);
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char *buffer = NULL;
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size_t buffer_length = 0;
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while (xgetline (&buffer, &buffer_length, out))
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if (startswith (buffer, "la_symbind: tst_audit18bmod1_func") == 0)
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find_symbind = true;
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TEST_COMPARE (find_symbind, true);
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free (buffer);
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xfclose (out);
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return 0;
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}
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#define TEST_FUNCTION_ARGV do_test
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#include <support/test-driver.c>
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