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95 lines
2.6 KiB
95 lines
2.6 KiB
/* |
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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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