Dmitry V. Levin
ea7002822f
* tests/overflowuid.c (read_int_from_file): New function. (check_overflow_id): Use it. * tests/tests.h (read_int_from_file): New prototype.
96 lines
2.6 KiB
C
96 lines
2.6 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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int
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read_int_from_file(const char *const fname, int *const pvalue)
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{
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const int fd = open(fname, O_RDONLY);
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if (fd < 0)
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return -1;
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long lval;
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char buf[sizeof(lval) * 3];
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int n = read(fd, buf, sizeof(buf) - 1);
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int saved_errno = errno;
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close(fd);
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if (n < 0) {
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errno = saved_errno;
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return -1;
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}
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buf[n] = '\0';
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char *endptr = 0;
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errno = 0;
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lval = strtol(buf, &endptr, 10);
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if (!endptr || (*endptr && '\n' != *endptr)
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#if INT_MAX < LONG_MAX
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|| lval > INT_MAX || lval < INT_MIN
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#endif
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|| ERANGE == errno) {
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if (!errno)
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errno = EINVAL;
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return -1;
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}
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*pvalue = (int) lval;
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return 0;
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}
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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 n;
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if (read_int_from_file(overflowid, &n)) {
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if (ENOENT == errno)
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return;
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perror_msg_and_fail("read_int_from_file: %s", overflowid);
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}
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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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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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