Dmitry V. Levin
c1f1cc1b4c
This code used in two different places, so move it to the library. * tests/overflowuid.c: New file. * tests/Makefile.am (libtests_a_SOURCES): Add it. * tests/tests.h (check_overflowuid, check_overflowgid): New prototypes. * tests/uid.c (main): Use check_overflowuid. * tests/uid16.c (main): Likewise.
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* Copyright (c) 2014-2016 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 <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void
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check_overflow_id(const int id, const char *overflowid)
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{
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int fd = open(overflowid, O_RDONLY);
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if (fd < 0) {
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if (ENOENT == errno)
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return;
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perror_msg_and_fail("open: %s", overflowid);
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}
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/* we trust the kernel */
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char buf[sizeof(int)*3];
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int n = read(fd, buf, sizeof(buf) - 1);
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if (n > 0) {
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buf[n] = '\0';
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n = atoi(buf);
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if (id == n)
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error_msg_and_skip("%d matches %s", id, overflowid);
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}
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close(fd);
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}
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void
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check_overflowuid(const int uid)
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{
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check_overflow_id(uid, "/proc/sys/kernel/overflowuid");
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}
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void
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check_overflowgid(const int gid)
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{
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check_overflow_id(gid, "/proc/sys/kernel/overflowgid");
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}
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