[gssapi-openssh.git] / openssh / openbsd-compat / xmmap.c

/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"

#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif

#include "log.h"

void *xmmap(size_t size)
{
	void *address;

#ifdef HAVE_MMAP
# ifdef MAP_ANON
	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
	    -1, 0);
# else
	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
	    open("/dev/zero", O_RDWR), 0);
# endif

#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
	if (address == MAP_FAILED) {
		char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
		int tmpfd;

		tmpfd = mkstemp(tmpname);
		if (tmpfd == -1)
			fatal("mkstemp(\"%s\"): %s",
			    MM_SWAP_TEMPLATE, strerror(errno));
		unlink(tmpname);
		ftruncate(tmpfd, size);
		address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
		    tmpfd, 0);
		close(tmpfd);
	}

	return (address);
#else
	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
	    __func__);
#endif /* HAVE_MMAP */

}
Commit	Line	Data
cc0583a1	1	/*
	2	* Redistribution and use in source and binary forms, with or without
	3	* modification, are permitted provided that the following conditions
	4	* are met:
	5	* 1. Redistributions of source code must retain the above copyright
	6	* notice, this list of conditions and the following disclaimer.
	7	* 2. Redistributions in binary form must reproduce the above copyright
	8	* notice, this list of conditions and the following disclaimer in the
	9	* documentation and/or other materials provided with the distribution.
	10	*
	11	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	12	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	13	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	14	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	15	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	16	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	17	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	18	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	19	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	20	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	21	*/
	22
	23	#include "includes.h"
	24
	25	#ifdef HAVE_SYS_MMAN_H
	26	#include <sys/mman.h>
	27	#endif
	28
	29	#include "log.h"
	30
	31	void *xmmap(size_t size)
	32	{
	33	void *address;
	34
	35	#ifdef HAVE_MMAP
	36	# ifdef MAP_ANON
	37	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_ANON\|MAP_SHARED,
	38	-1, 0);
	39	# else
	40	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_SHARED,
	41	open("/dev/zero", O_RDWR), 0);
	42	# endif
	43
	44	#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
	45	if (address == MAP_FAILED) {
	46	char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
	47	int tmpfd;
	48
	49	tmpfd = mkstemp(tmpname);
	50	if (tmpfd == -1)
	51	fatal("mkstemp(\"%s\"): %s",
	52	MM_SWAP_TEMPLATE, strerror(errno));
	53	unlink(tmpname);
	54	ftruncate(tmpfd, size);
	55	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_SHARED,
	56	tmpfd, 0);
	57	close(tmpfd);
	58	}
	59
	60	return (address);
	61	#else
	62	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
	63	__func__);
	64	#endif /* HAVE_MMAP */
65
66	}
67