Add mremap tests

Add tests for MREMAP_MAYMOVE and MREMAP_FIXED.  On Linux, also test
MREMAP_DONTUNMAP.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
(cherry picked from commit ff0320bec2)
This commit is contained in:
H.J. Lu 2024-07-24 14:05:15 -07:00 committed by Florian Weimer
parent a8c230c881
commit 7f5ccdd8af
7 changed files with 221 additions and 0 deletions

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@ -251,6 +251,8 @@ tests := \
tst-mntent-blank-passno \
tst-mntent-escape \
tst-mntent2 \
tst-mremap1 \
tst-mremap2 \
tst-preadvwritev \
tst-preadvwritev2 \
tst-preadvwritev64 \

46
misc/tst-mremap1.c Normal file
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@ -0,0 +1,46 @@
/* Test mremap with MREMAP_MAYMOVE.
Copyright (C) 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 <errno.h>
#include <sys/mman.h>
#include <support/xstdlib.h>
#include <support/xunistd.h>
#include <support/check.h>
#include <support/test-driver.h>
static int
do_test (void)
{
size_t old_size = getpagesize ();
char *old_addr = xmmap (NULL, old_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
old_addr[0] = 1;
old_addr[old_size - 1] = 2;
/* Test MREMAP_MAYMOVE. */
size_t new_size = old_size + old_size;
char *new_addr = mremap (old_addr, old_size, new_size, MREMAP_MAYMOVE);
TEST_VERIFY_EXIT (new_addr != MAP_FAILED);
new_addr[0] = 1;
new_addr[new_size - 1] = 2;
xmunmap (new_addr, new_size);
return 0;
}
#include <support/test-driver.c>

54
misc/tst-mremap2.c Normal file
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@ -0,0 +1,54 @@
/* Test mremap with MREMAP_FIXED.
Copyright (C) 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 <errno.h>
#include <sys/mman.h>
#include <support/xstdlib.h>
#include <support/xunistd.h>
#include <support/test-driver.h>
#include <mremap-failure.h>
static int
do_test (void)
{
size_t old_size = getpagesize ();
size_t new_size = old_size + old_size;
char *old_addr = xmmap (NULL, old_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
old_addr[0] = 1;
old_addr[old_size - 1] = 2;
char *fixed_addr = xmmap (NULL, new_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
fixed_addr[0] = 1;
fixed_addr[new_size - 1] = 2;
/* Test MREMAP_FIXED. */
char *new_addr = mremap (old_addr, old_size, new_size,
MREMAP_FIXED | MREMAP_MAYMOVE,
fixed_addr);
if (new_addr == MAP_FAILED)
return mremap_failure_exit (errno);
new_addr[0] = 1;
new_addr[new_size - 1] = 2;
xmunmap (new_addr, new_size);
return 0;
}
#include <support/test-driver.c>

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@ -0,0 +1,25 @@
/* mremap failure handling. Generic version.
Copyright (C) 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/>. */
/* Return exit value on mremap failure with errno ERR. */
static int
mremap_failure_exit (int err)
{
return EXIT_FAILURE;
}

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@ -205,6 +205,7 @@ tests += \
tst-getauxval \
tst-gettid \
tst-gettid-kill \
tst-linux-mremap1 \
tst-memfd_create \
tst-misalign-clone \
tst-mlock2 \

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@ -0,0 +1,30 @@
/* mremap failure handling. Linux version.
Copyright (C) 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 <support/check.h>
/* Return exit value on mremap failure with errno ERR. */
static int
mremap_failure_exit (int err)
{
if (err != EINVAL)
return EXIT_FAILURE;
return EXIT_UNSUPPORTED;
}

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@ -0,0 +1,63 @@
/* Test mremap with MREMAP_DONTUNMAP.
Copyright (C) 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 <errno.h>
#include <sys/mman.h>
#include <support/xstdlib.h>
#include <support/xunistd.h>
#include <support/check.h>
#include <support/test-driver.h>
#include <mremap-failure.h>
static int
do_test (void)
{
size_t old_size = getpagesize ();
size_t new_size = old_size;
char *old_addr = xmmap (NULL, old_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
old_addr[0] = 1;
old_addr[old_size - 1] = 2;
/* Create an available 64-page mmap region. */
size_t fixed_size = old_size * 64;
char *fixed_addr = xmmap (NULL, fixed_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
xmunmap (fixed_addr, fixed_size);
/* Add 3 * pagesize. */
fixed_size += 3 * old_size;
/* Test MREMAP_DONTUNMAP. It should return FIXED_ADDR created above. */
char *new_addr = mremap (old_addr, old_size, new_size,
MREMAP_DONTUNMAP | MREMAP_MAYMOVE,
fixed_addr);
if (new_addr == MAP_FAILED)
return mremap_failure_exit (errno);
TEST_VERIFY_EXIT (fixed_addr == new_addr);
old_addr[0] = 3;
old_addr[old_size - 1] = 4;
new_addr[0] = 1;
new_addr[new_size - 1] = 2;
xmunmap (new_addr, new_size);
xmunmap (old_addr, old_size);
return 0;
}
#include <support/test-driver.c>