Dmitry V. Levin
3db07f11c8
* mem.c (SYS_FUNC(old_mmap)): Use umove_or_printaddr instead of umoven to fetch mmap arguments, return RVAL_DECODED when umove_or_printaddr fails. * tests/old_mmap.c (main): Check it.
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/*
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* Check decoding of "old mmap" edition of mmap syscall.
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*
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* Copyright (c) 2016 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 <sys/syscall.h>
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/*
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* On s390x, this is the mmap syscall used by glibc, so,
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* from one side, it's already covered by another test, and, from another side,
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* it would require additional efforts to filter out mmap calls made by glibc.
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*/
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#if defined __NR_mmap && \
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( defined __arm__ \
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|| defined __i386__ \
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|| defined __m68k__ \
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|| (defined __s390__ && !defined __s390x__) \
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)
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# include <stdio.h>
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# include <string.h>
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# include <sys/mman.h>
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# include <unistd.h>
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int
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main(void)
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{
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long rc = syscall(__NR_mmap, 0);
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printf("mmap(NULL) = %ld %s (%m)\n", rc, errno2name());
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const unsigned int args1_c[6] = {
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0xdeadbeef, /* addr */
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0xfacefeed, /* len */
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PROT_READ|PROT_EXEC, /* prot */
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MAP_FILE|MAP_FIXED, /* flags */
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-2U, /* fd */
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0xbadc0ded /* offset */
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};
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const unsigned int page_size = get_page_size();
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const unsigned int args2_c[6] = {
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0,
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page_size,
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PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS,
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-1U,
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0xfaced000 & -page_size
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};
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void *args = tail_memdup(args1_c, sizeof(args1_c));
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rc = syscall(__NR_mmap, args);
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printf("mmap(%#x, %u, PROT_READ|PROT_EXEC, MAP_FILE|MAP_FIXED"
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", %d, %#x) = %ld %s (%m)\n",
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args1_c[0], args1_c[1], args1_c[4], args1_c[5],
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rc, errno2name());
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memcpy(args, args2_c, sizeof(args2_c));
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rc = syscall(__NR_mmap, args);
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printf("mmap(NULL, %u, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS"
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", %d, %#x) = %#lx\n",
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args2_c[1], args2_c[4], args2_c[5], rc);
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void *addr = (void *) rc;
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if (mprotect(addr, page_size, PROT_NONE))
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perror_msg_and_fail("mprotect(%p, %u, PROT_NONE)",
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addr, page_size);
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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_mmap && (__arm__ || __i386__ || __m68k__"
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" || (__s390__ && !__s390x__))")
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#endif
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