/*
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* Check decoding of getgroups/getgroups32 syscalls.
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*
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* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016-2017 The strace developers.
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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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#ifdef __NR_getgroups32
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# define SYSCALL_NR __NR_getgroups32
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# define SYSCALL_NAME "getgroups32"
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# define GID_TYPE unsigned int
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#else
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# include "tests.h"
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# include <asm/unistd.h>
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# ifdef __NR_getgroups
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# define SYSCALL_NR __NR_getgroups
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# define SYSCALL_NAME "getgroups"
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# if defined __NR_getgroups32 && __NR_getgroups != __NR_getgroups32
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# define GID_TYPE unsigned short
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# else
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# define GID_TYPE unsigned int
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# endif
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# endif
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#endif
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#ifdef GID_TYPE
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# include <stdio.h>
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# include <unistd.h>
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#define MAX_STRLEN 32
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static long ngroups;
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static void
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get_groups(const long size, GID_TYPE *const g)
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{
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long i = syscall(SYSCALL_NR, size, g);
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if (i != ngroups)
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perror_msg_and_fail("%s(%#lx, %p)", SYSCALL_NAME, size, g);
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printf("%s(%d, [", SYSCALL_NAME, (int) size);
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for (i = 0; i < ngroups; ++i) {
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if (i)
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printf(", ");
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if (i >= MAX_STRLEN) {
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printf("...");
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break;
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}
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printf("%u", (unsigned int) g[i]);
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}
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printf("]) = %ld\n", ngroups);
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}
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int
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main(void)
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{
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long rc;
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/* check how the first argument is decoded */
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ngroups = syscall(SYSCALL_NR, 0, 0);
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printf("%s(0, NULL) = %ld\n", SYSCALL_NAME, ngroups);
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if (ngroups < 0)
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perror_msg_and_fail(SYSCALL_NAME);
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rc = syscall(SYSCALL_NR, F8ILL_KULONG_MASK, 0);
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printf("%s(0, NULL) = %ld\n", SYSCALL_NAME, rc);
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rc = syscall(SYSCALL_NR, -1U, 0);
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printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, -1, sprintrc(rc));
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rc = syscall(SYSCALL_NR, -1L, 0);
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printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, -1, sprintrc(rc));
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const unsigned int ngroups_max = sysconf(_SC_NGROUPS_MAX);
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rc = syscall(SYSCALL_NR, ngroups_max, 0);
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printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, ngroups_max, sprintrc(rc));
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rc = syscall(SYSCALL_NR, F8ILL_KULONG_MASK | ngroups_max, 0);
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printf("%s(%d, NULL) = %s\n", SYSCALL_NAME, ngroups_max, sprintrc(rc));
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/* check how the second argument is decoded */
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GID_TYPE *const g1 =
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tail_alloc(ngroups ? sizeof(*g1) * ngroups : 1);
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GID_TYPE *const g2 = tail_alloc(sizeof(*g2) * (ngroups + 1));
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void *efault = g2 + ngroups + 1;
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get_groups(ngroups, g1);
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get_groups(ngroups + 1, g1);
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get_groups(ngroups + 1, g2);
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if (ngroups) {
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rc = syscall(SYSCALL_NR, ngroups, efault);
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printf("%s(%d, %p) = %s\n",
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SYSCALL_NAME, (unsigned) ngroups, efault, sprintrc(rc));
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}
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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_getgroups")
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#endif
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