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4f5704ea34
A plain indirect function call does not work on POWER because
success and failure are signaled through a flag register, and
not via the usual Linux negative return value convention.
This has potential security impact, in two ways: the return value
could be out of bounds (EAGAIN is 11 on powerpc6le), and no
random bytes have been written despite the non-error return value.
Fixes commit 461cab1de7 ("linux: Add
support for getrandom vDSO").
Reported-by: Ján Stanček <jstancek@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
/* Test errno handling in getrandom (bug 32440).
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Copyright (C) 2024 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 <errno.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <sys/random.h>
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static
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int do_test (void)
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{
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errno = -1181968554; /* Just a random value. */
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char buf[4];
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int ret = getrandom (buf, sizeof (buf), -1); /* All flags set. */
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if (errno != ENOSYS)
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TEST_COMPARE (errno, EINVAL);
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TEST_COMPARE (ret, -1);
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return 0;
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}
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#include <support/test-driver.c>
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