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103 lines
3.2 KiB
103 lines
3.2 KiB
4 months ago
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/*
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* Check decoding of memfd_create syscall.
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*
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* Copyright (c) 2015-2017 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <asm/unistd.h>
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#include "scno.h"
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#ifdef __NR_memfd_create
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# include <stdio.h>
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# include <stdint.h>
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# include <unistd.h>
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# ifdef HAVE_LINUX_MEMFD_H
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# include <linux/memfd.h>
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# endif
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# ifndef MFD_HUGE_SHIFT
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# define MFD_HUGE_SHIFT 26
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# endif
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# ifndef MFD_HUGE_MASK
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# define MFD_HUGE_MASK 0x3f
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# endif
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static const char *errstr;
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static long
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k_memfd_create(const kernel_ulong_t name, const kernel_ulong_t flags)
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{
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const long rc = syscall(__NR_memfd_create, name, flags);
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errstr = sprintrc(rc);
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return rc;
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}
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int
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main(void)
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{
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const size_t size = 255 - (sizeof("memfd:") - 1) + 1;
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char *pattern = tail_alloc(size);
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fill_memory_ex(pattern, size, '0', 10);
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k_memfd_create((uintptr_t) pattern, 0);
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printf("memfd_create(\"%.*s\"..., 0) = %s\n",
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(int) size - 1, pattern, errstr);
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kernel_ulong_t flags = (kernel_ulong_t) 0xfacefeed00000007ULL;
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k_memfd_create((uintptr_t) pattern, flags);
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printf("memfd_create(\"%.*s\"..., %s) = %s\n",
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(int) size - 1, pattern,
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"MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB",
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errstr);
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pattern[size - 1] = '\0';
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flags = 30 << MFD_HUGE_SHIFT;
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k_memfd_create((uintptr_t) pattern, flags);
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printf("memfd_create(\"%s\", 30<<MFD_HUGE_SHIFT) = %s\n",
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pattern, errstr);
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pattern += size - 1;
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flags = (kernel_ulong_t) -1ULL;
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k_memfd_create(0, flags);
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flags = -1U & ~(7 | (MFD_HUGE_MASK << MFD_HUGE_SHIFT));
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printf("memfd_create(NULL, MFD_CLOEXEC|MFD_ALLOW_SEALING|MFD_HUGETLB"
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"|%#x|%u<<MFD_HUGE_SHIFT) = %s\n",
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(unsigned int) flags, MFD_HUGE_MASK, errstr);
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puts("+++ exited with 0 +++");
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return 0;
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}
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#else
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SKIP_MAIN_UNDEFINED("__NR_memfd_create")
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#endif
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