/* Common function for preadv2 and pwritev2 tests. Copyright (C) 2017-2024 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 <limits.h> #include <support/check.h> #ifndef RWF_HIPRI # define RWF_HIPRI 0 #endif #ifndef RWF_DSYNC # define RWF_DSYNC 0 #endif #ifndef RWF_SYNC # define RWF_SYNC 0 #endif #ifndef RWF_NOWAIT # define RWF_NOWAIT 0 #endif #ifndef RWF_APPEND # define RWF_APPEND 0 #endif #ifndef RWF_NOAPPEND # define RWF_NOAPPEND 0 #endif #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT \ | RWF_APPEND | RWF_NOAPPEND) /* Generic uio_lim.h does not define IOV_MAX. */ #ifndef IOV_MAX # define IOV_MAX 1024 #endif static void do_test_with_invalid_fd (void) { char buf[256]; struct iovec iov = { buf, sizeof buf }; /* Check with flag being 0 to use the fallback code which calls pwritev or writev. */ TEST_VERIFY (preadv2 (-1, &iov, 1, -1, 0) == -1); TEST_COMPARE (errno, EBADF); TEST_VERIFY (pwritev2 (-1, &iov, 1, -1, 0) == -1); TEST_COMPARE (errno, EBADF); /* Same tests as before but with flags being different than 0. Since there is no emulation for any flag value, fallback code returns ENOTSUP. This is different running on a kernel with preadv2/pwritev2 support, where EBADF is returned). */ TEST_VERIFY (preadv2 (-1, &iov, 1, 0, RWF_HIPRI) == -1); TEST_VERIFY (errno == EBADF || errno == ENOTSUP); TEST_VERIFY (pwritev2 (-1, &iov, 1, 0, RWF_HIPRI) == -1); TEST_VERIFY (errno == EBADF || errno == ENOTSUP); } static void do_test_with_invalid_iov (void) { { char buf[256]; struct iovec iov; iov.iov_base = buf; iov.iov_len = (size_t)SSIZE_MAX + 1; TEST_VERIFY (preadv2 (temp_fd, &iov, 1, 0, 0) == -1); TEST_COMPARE (errno, EINVAL); TEST_VERIFY (pwritev2 (temp_fd, &iov, 1, 0, 0) == -1); TEST_COMPARE (errno, EINVAL); /* Same as for invalid file descriptor tests, emulation fallback first checks for flag value and return ENOTSUP. */ TEST_VERIFY (preadv2 (temp_fd, &iov, 1, 0, RWF_HIPRI) == -1); TEST_VERIFY (errno == EINVAL || errno == ENOTSUP); TEST_VERIFY (pwritev2 (temp_fd, &iov, 1, 0, RWF_HIPRI) == -1); TEST_VERIFY (errno == EINVAL || errno == ENOTSUP); } { /* An invalid iovec buffer should trigger an invalid memory access or an error (Linux for instance returns EFAULT). */ struct iovec iov[IOV_MAX+1] = { 0 }; TEST_VERIFY (preadv2 (temp_fd, iov, IOV_MAX + 1, 0, RWF_HIPRI) == -1); TEST_VERIFY (errno == EINVAL || errno == ENOTSUP); TEST_VERIFY (pwritev2 (temp_fd, iov, IOV_MAX + 1, 0, RWF_HIPRI) == -1); TEST_VERIFY (errno == EINVAL || errno == ENOTSUP); } } static void do_test_with_invalid_flags (void) { /* Set the next bit from the mask of all supported flags. */ int invalid_flag = RWF_SUPPORTED != 0 ? __builtin_clz (RWF_SUPPORTED) : 2; invalid_flag = 0x1 << ((sizeof (int) * CHAR_BIT) - invalid_flag); char buf[32]; const struct iovec vec = { .iov_base = buf, .iov_len = sizeof (buf) }; if (preadv2 (temp_fd, &vec, 1, 0, invalid_flag) != -1) FAIL_EXIT1 ("preadv2 did not fail with an invalid flag"); if (errno != ENOTSUP) FAIL_EXIT1 ("preadv2 failure did not set errno to ENOTSUP (%d)", errno); /* This might fail for compat syscall (32 bits running on 64 bits kernel) due a kernel issue. */ if (pwritev2 (temp_fd, &vec, 1, 0, invalid_flag) != -1) FAIL_EXIT1 ("pwritev2 did not fail with an invalid flag"); if (errno != ENOTSUP) FAIL_EXIT1 ("pwritev2 failure did not set errno to ENOTSUP (%d)", errno); }