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58a31b4316
Two tests fail from time to time when a new flag is added for the
p{write,read}v2 functions in a new Linux kernel:
- misc/tst-preadvwritev2
- misc/tst-preadvwritev64v2
This disrupts when testing Glibc on a system with a newer kernel
and it seems we can try improve testing for invalid flags setting
all the bits that are not supposed to be supported (rather than
setting only the next unsupported bit).
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
/* Common function for preadv2 and pwritev2 tests.
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Copyright (C) 2017-2025 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 <limits.h>
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#include <support/check.h>
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#ifndef RWF_HIPRI
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# define RWF_HIPRI 0
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#endif
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#ifndef RWF_DSYNC
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# define RWF_DSYNC 0
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#endif
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#ifndef RWF_SYNC
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# define RWF_SYNC 0
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#endif
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#ifndef RWF_NOWAIT
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# define RWF_NOWAIT 0
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#endif
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#ifndef RWF_APPEND
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# define RWF_APPEND 0
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#endif
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#ifndef RWF_NOAPPEND
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# define RWF_NOAPPEND 0
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#endif
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#ifndef RWF_ATOMIC
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# define RWF_ATOMIC 0
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#endif
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#ifndef RWF_DONTCACHE
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# define RWF_DONTCACHE 0
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#endif
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#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT \
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| RWF_APPEND | RWF_NOAPPEND | RWF_ATOMIC \
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| RWF_DONTCACHE)
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/* Generic uio_lim.h does not define IOV_MAX. */
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#ifndef IOV_MAX
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# define IOV_MAX 1024
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#endif
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static void
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do_test_with_invalid_fd (void)
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{
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char buf[256];
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struct iovec iov = { buf, sizeof buf };
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/* Check with flag being 0 to use the fallback code which calls pwritev
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or writev. */
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TEST_VERIFY (preadv2 (-1, &iov, 1, -1, 0) == -1);
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TEST_COMPARE (errno, EBADF);
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TEST_VERIFY (pwritev2 (-1, &iov, 1, -1, 0) == -1);
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TEST_COMPARE (errno, EBADF);
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/* Same tests as before but with flags being different than 0. Since
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there is no emulation for any flag value, fallback code returns
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ENOTSUP. This is different running on a kernel with preadv2/pwritev2
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support, where EBADF is returned). */
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TEST_VERIFY (preadv2 (-1, &iov, 1, 0, RWF_HIPRI) == -1);
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TEST_VERIFY (errno == EBADF || errno == ENOTSUP);
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TEST_VERIFY (pwritev2 (-1, &iov, 1, 0, RWF_HIPRI) == -1);
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TEST_VERIFY (errno == EBADF || errno == ENOTSUP);
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}
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static void
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do_test_with_invalid_iov (void)
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{
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{
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char buf[256];
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struct iovec iov;
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iov.iov_base = buf;
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iov.iov_len = (size_t)SSIZE_MAX + 1;
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TEST_VERIFY (preadv2 (temp_fd, &iov, 1, 0, 0) == -1);
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TEST_COMPARE (errno, EINVAL);
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TEST_VERIFY (pwritev2 (temp_fd, &iov, 1, 0, 0) == -1);
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TEST_COMPARE (errno, EINVAL);
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/* Same as for invalid file descriptor tests, emulation fallback
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first checks for flag value and return ENOTSUP. */
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TEST_VERIFY (preadv2 (temp_fd, &iov, 1, 0, RWF_HIPRI) == -1);
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TEST_VERIFY (errno == EINVAL || errno == ENOTSUP);
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TEST_VERIFY (pwritev2 (temp_fd, &iov, 1, 0, RWF_HIPRI) == -1);
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TEST_VERIFY (errno == EINVAL || errno == ENOTSUP);
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}
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{
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/* An invalid iovec buffer should trigger an invalid memory access
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or an error (Linux for instance returns EFAULT). */
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struct iovec iov[IOV_MAX+1] = { };
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TEST_VERIFY (preadv2 (temp_fd, iov, IOV_MAX + 1, 0, RWF_HIPRI) == -1);
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TEST_VERIFY (errno == EINVAL || errno == ENOTSUP);
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TEST_VERIFY (pwritev2 (temp_fd, iov, IOV_MAX + 1, 0, RWF_HIPRI) == -1);
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TEST_VERIFY (errno == EINVAL || errno == ENOTSUP);
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}
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}
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static void
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do_test_with_invalid_flags (void)
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{
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/* Set all the bits that are not used by the supported flags. */
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int invalid_flag = ~RWF_SUPPORTED;
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char buf[32];
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const struct iovec vec = { .iov_base = buf, .iov_len = sizeof (buf) };
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if (preadv2 (temp_fd, &vec, 1, 0, invalid_flag) != -1)
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FAIL_EXIT1 ("preadv2 did not fail with an invalid flag");
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if (errno != ENOTSUP)
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FAIL_EXIT1 ("preadv2 failure did not set errno to ENOTSUP (%d)", errno);
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/* This might fail for compat syscall (32 bits running on 64 bits kernel)
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due a kernel issue. */
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if (pwritev2 (temp_fd, &vec, 1, 0, invalid_flag) != -1)
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FAIL_EXIT1 ("pwritev2 did not fail with an invalid flag");
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if (errno != ENOTSUP)
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FAIL_EXIT1 ("pwritev2 failure did not set errno to ENOTSUP (%d)", errno);
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}
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