236 lines
6.5 KiB
C
236 lines
6.5 KiB
C
/*
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* Check decoding of kcmp syscall.
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*
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* Copyright (c) 2016-2017 Eugene Syromyatnikov <evgsyr@gmail.com>
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* Copyright (c) 2016-2018 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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#include "tests.h"
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#include <asm/unistd.h>
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#include "scno.h"
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#ifdef __NR_kcmp
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# include <fcntl.h>
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# include <stdarg.h>
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# include <stdint.h>
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# include <stdio.h>
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# include <string.h>
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# include <unistd.h>
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# ifndef VERBOSE_FD
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# define VERBOSE_FD 0
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# endif
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/*
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* We prefer to use system headers in order to catch some possible deviations in
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* system's headers from our perception of reality, but happy to include our own
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* definitions as well.
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*/
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# ifdef HAVE_LINUX_KCMP_H
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# include <linux/kcmp.h>
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# else
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# define KCMP_FILE 0
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# define KCMP_VM 1
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# define KCMP_FILES 2
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# define KCMP_FS 3
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# define KCMP_SIGHAND 4
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# define KCMP_IO 5
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# define KCMP_SYSVSEM 6
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# endif
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/* All other kcmp types have been added atomically */
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# define KCMP_EPOLL_TFD 7
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# ifndef HAVE_STRUCT_KCMP_EPOLL_SLOT
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struct kcmp_epoll_slot {
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uint32_t efd;
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uint32_t tfd;
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uint32_t toff;
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};
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# endif
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static const kernel_ulong_t kcmp_max_type = KCMP_EPOLL_TFD;
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static const char null_path[] = "/dev/null";
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static const char zero_path[] = "/dev/zero";
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# define NULL_FD 23
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# define ZERO_FD 42
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static void
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printpidfd(const char *prefix, pid_t pid, unsigned fd)
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{
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printf("%s%d", prefix, fd);
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}
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/*
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* Last argument is optional and is used as follows:
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* * When type is KCMP_EPOLL_TFD, it signalises whether idx2 is a valid
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* pointer.
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*/
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static void
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do_kcmp(kernel_ulong_t pid1, kernel_ulong_t pid2, kernel_ulong_t type,
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const char *type_str, kernel_ulong_t idx1, kernel_ulong_t idx2, ...)
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{
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long rc;
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const char *errstr;
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rc = syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
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errstr = sprintrc(rc);
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printf("kcmp(%d, %d, ", (int) pid1, (int) pid2);
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if (type_str)
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printf("%s", type_str);
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else
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printf("%#x /* KCMP_??? */", (int) type);
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if (type == KCMP_FILE) {
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printpidfd(", ", pid1, idx1);
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printpidfd(", ", pid2, idx2);
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} else if (type == KCMP_EPOLL_TFD) {
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va_list ap;
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int valid_ptr;
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va_start(ap, idx2);
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valid_ptr = va_arg(ap, int);
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va_end(ap);
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printpidfd(", ", pid1, idx1);
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printf(", ");
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if (valid_ptr) {
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struct kcmp_epoll_slot *slot =
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(struct kcmp_epoll_slot *) (uintptr_t) idx2;
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printpidfd("{efd=", pid2, slot->efd);
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printpidfd(", tfd=", pid2, slot->tfd);
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printf(", toff=%llu}", (unsigned long long) slot->toff);
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} else {
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if (idx2)
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printf("%#llx", (unsigned long long) idx2);
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else
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printf("NULL");
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}
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} else if (type > kcmp_max_type) {
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printf(", %#llx, %#llx",
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(unsigned long long) idx1, (unsigned long long) idx2);
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}
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printf(") = %s\n", errstr);
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}
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int
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main(void)
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{
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static const kernel_ulong_t bogus_pid1 =
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(kernel_ulong_t) 0xdeadca75face1057ULL;
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static const kernel_ulong_t bogus_pid2 =
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(kernel_ulong_t) 0xdefaced1defaced2ULL;
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static const kernel_ulong_t bogus_type =
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(kernel_ulong_t) 0xbadc0dedda7adeadULL;
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static const kernel_ulong_t bogus_idx1 =
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(kernel_ulong_t) 0xdec0ded3dec0ded4ULL;
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static const kernel_ulong_t bogus_idx2 =
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(kernel_ulong_t) 0xba5e1e55deadc0deULL;
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static const struct kcmp_epoll_slot slot_data[] = {
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{ 0xdeadc0de, 0xfacef157, 0xbadc0ded },
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{ NULL_FD, ZERO_FD, 0 },
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{ 0, 0, 0 },
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};
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static kernel_ulong_t ptr_check =
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F8ILL_KULONG_SUPPORTED ? F8ILL_KULONG_MASK : 0;
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int fd;
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unsigned i;
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TAIL_ALLOC_OBJECT_CONST_PTR(struct kcmp_epoll_slot, slot);
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/* Open some files to test printpidfd */
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fd = open(null_path, O_RDONLY);
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if (fd < 0)
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perror_msg_and_fail("open(\"%s\")", null_path);
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if (fd != NULL_FD) {
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if (dup2(fd, NULL_FD) < 0)
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perror_msg_and_fail("dup2(fd, NULL_FD)");
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close(fd);
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}
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fd = open(zero_path, O_RDONLY);
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if (fd < 0)
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perror_msg_and_fail("open(\"%s\")", zero_path);
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if (fd != ZERO_FD) {
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if (dup2(fd, ZERO_FD) < 0)
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perror_msg_and_fail("dup2(fd, ZERO_FD)");
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close(fd);
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}
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close(0);
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/* Invalid values */
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do_kcmp(bogus_pid1, bogus_pid2, bogus_type, NULL, bogus_idx1,
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bogus_idx2);
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do_kcmp(F8ILL_KULONG_MASK, F8ILL_KULONG_MASK, kcmp_max_type + 1, NULL,
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0, 0);
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/* KCMP_FILE is the only type which has additional args */
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do_kcmp(3141592653U, 2718281828U, ARG_STR(KCMP_FILE), bogus_idx1,
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bogus_idx2);
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do_kcmp(-1, -1, ARG_STR(KCMP_FILE), NULL_FD, ZERO_FD);
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/* Types without additional args */
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do_kcmp(-1, -1, ARG_STR(KCMP_VM), bogus_idx1, bogus_idx2);
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do_kcmp(-1, -1, ARG_STR(KCMP_FILES), bogus_idx1, bogus_idx2);
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do_kcmp(-1, -1, ARG_STR(KCMP_FS), bogus_idx1, bogus_idx2);
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do_kcmp(-1, -1, ARG_STR(KCMP_SIGHAND), bogus_idx1, bogus_idx2);
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do_kcmp(-1, -1, ARG_STR(KCMP_IO), bogus_idx1, bogus_idx2);
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do_kcmp(-1, -1, ARG_STR(KCMP_SYSVSEM), bogus_idx1, bogus_idx2);
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/* KCMP_EPOLL_TFD checks */
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do_kcmp(-1, -1, ARG_STR(KCMP_EPOLL_TFD),
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F8ILL_KULONG_MASK | 2718281828U, ptr_check, 0);
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do_kcmp(-1, -1, ARG_STR(KCMP_EPOLL_TFD),
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3141592653U, (uintptr_t) slot + 1, 0);
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for (i = 0; i < ARRAY_SIZE(slot_data); i++) {
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memcpy(slot, slot_data + i, sizeof(*slot));
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do_kcmp(getpid(), getppid(), ARG_STR(KCMP_EPOLL_TFD), NULL_FD,
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(uintptr_t) slot, 1);
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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_kcmp");
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#endif
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