e3e589829d
This tunable allows applications to register the rseq area instead of glibc. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/* Test disabling of rseq registration via tunable.
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Copyright (C) 2021 Free Software Foundation, Inc.
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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 <errno.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/namespace.h>
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#include <support/xthread.h>
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#include <sysdep.h>
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#include <unistd.h>
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#ifdef RSEQ_SIG
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/* Check that rseq can be registered and has not been taken by glibc. */
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static void
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check_rseq_disabled (void)
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{
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struct pthread *pd = THREAD_SELF;
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TEST_COMPARE ((int) pd->rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED);
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int ret = syscall (__NR_rseq, &pd->rseq_area, sizeof (pd->rseq_area),
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0, RSEQ_SIG);
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if (ret == 0)
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{
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ret = syscall (__NR_rseq, &pd->rseq_area, sizeof (pd->rseq_area),
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RSEQ_FLAG_UNREGISTER, RSEQ_SIG);
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TEST_COMPARE (ret, 0);
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pd->rseq_area.cpu_id = RSEQ_CPU_ID_REGISTRATION_FAILED;
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}
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else
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{
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TEST_VERIFY (errno != -EINVAL);
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TEST_VERIFY (errno != -EBUSY);
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}
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}
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static void *
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thread_func (void *ignored)
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{
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check_rseq_disabled ();
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return NULL;
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}
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static void
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proc_func (void *ignored)
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{
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check_rseq_disabled ();
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}
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static int
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do_test (void)
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{
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puts ("info: checking main thread");
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check_rseq_disabled ();
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puts ("info: checking main thread (2)");
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check_rseq_disabled ();
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puts ("info: checking new thread");
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xpthread_join (xpthread_create (NULL, thread_func, NULL));
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puts ("info: checking subprocess");
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support_isolate_in_subprocess (proc_func, NULL);
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return 0;
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}
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#else /* !RSEQ_SIG */
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static int
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do_test (void)
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{
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FAIL_UNSUPPORTED ("glibc does not define RSEQ_SIG, skipping test");
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}
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#endif
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#include <support/test-driver.c>
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