/*
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* Check decoding of PR_SET_SPECULATION_CTRL and PR_GET_SPECULATION_CTRL
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* prctl operations.
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*
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* Copyright (c) 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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#ifdef __NR_prctl
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# include <stdio.h>
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# include <stdlib.h>
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# include <unistd.h>
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# include <linux/prctl.h>
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static long injected_val;
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long
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do_prctl(kernel_ulong_t cmd, kernel_ulong_t arg2, kernel_ulong_t arg3)
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{
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long rc = syscall(__NR_prctl, cmd, arg2, arg3);
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if (rc != injected_val)
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error_msg_and_fail("Return value (%ld) differs from expected "
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"injected value (%ld)",
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rc, injected_val);
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return rc;
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}
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int
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main(int argc, char **argv)
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{
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static const kernel_ulong_t bogus_arg2 =
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(kernel_ulong_t) 0xdeadfacebadc0dedULL;
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static const kernel_ulong_t bogus_arg3 =
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(kernel_ulong_t) 0xdecafeedbeefda7eULL;
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static const struct {
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long arg;
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const char *str;
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} get_strs[] = {
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{ -1, "" },
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{ 0, " (PR_SPEC_NOT_AFFECTED)" },
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{ 1, " (PR_SPEC_PRCTL)" },
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{ 3, " (PR_SPEC_PRCTL|PR_SPEC_ENABLE)" },
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{ 8, " (PR_SPEC_FORCE_DISABLE)" },
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{ 16, " (0x10)" },
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{ 42, " (PR_SPEC_ENABLE|PR_SPEC_FORCE_DISABLE|0x20)" },
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};
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static const struct {
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kernel_ulong_t arg;
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const char *str;
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} set_strs[] = {
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{ 0, "0 /* PR_SPEC_??? */" },
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{ 1, "0x1 /* PR_SPEC_??? */" },
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{ 2, "PR_SPEC_ENABLE" },
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{ 3, "0x3 /* PR_SPEC_??? */" },
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{ 8, "PR_SPEC_FORCE_DISABLE" },
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{ 16, "0x10 /* PR_SPEC_??? */" },
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{ (kernel_ulong_t) 0xdecafeedbeefda7eULL, "0x"
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# if SIZEOF_KERNEL_LONG_T == 8
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"decafeed"
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# endif
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"beefda7e /* PR_SPEC_??? */" },
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};
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long rc;
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const char *str = NULL;
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if (argc < 2)
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error_msg_and_fail("Usage: %s INJECTED_VAL", argv[0]);
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injected_val = strtol(argv[1], NULL, 0);
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/* PR_GET_SPECULATION_CTRL */
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rc = do_prctl(52, 1, bogus_arg3);
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printf("prctl(PR_GET_SPECULATION_CTRL, 0x1 /* PR_SPEC_??? */) "
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"= %s (INJECTED)\n", sprintrc(rc));
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rc = do_prctl(52, bogus_arg2, bogus_arg3);
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printf("prctl(PR_GET_SPECULATION_CTRL, %#llx /* PR_SPEC_??? */) "
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"= %s (INJECTED)\n",
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(unsigned long long) bogus_arg2, sprintrc(rc));
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rc = do_prctl(52, 0, bogus_arg3);
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for (unsigned i = 0; i < ARRAY_SIZE(get_strs); i++) {
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if (get_strs[i].arg == rc) {
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str = get_strs[i].str;
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break;
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}
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}
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if (!str)
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error_msg_and_fail("Unknown return value: %ld", rc);
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printf("prctl(PR_GET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS) "
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"= %s%s (INJECTED)\n", sprintrc(rc), str);
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/* PR_SET_SPECULATION_CTRL*/
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rc = do_prctl(53, 1, bogus_arg3);
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printf("prctl(PR_SET_SPECULATION_CTRL, 0x1 /* PR_SPEC_??? */, %#llx) "
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"= %s (INJECTED)\n",
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(unsigned long long) bogus_arg3, sprintrc(rc));
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rc = do_prctl(53, bogus_arg2, bogus_arg3);
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printf("prctl(PR_SET_SPECULATION_CTRL, %#llx /* PR_SPEC_??? */, %#llx) "
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"= %s (INJECTED)\n",
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(unsigned long long) bogus_arg2,
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(unsigned long long) bogus_arg3,
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sprintrc(rc));
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for (unsigned i = 0; i < ARRAY_SIZE(set_strs); i++) {
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rc = do_prctl(53, 0, set_strs[i].arg);
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printf("prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS"
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", %s) = %s (INJECTED)\n",
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set_strs[i].str, 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_prctl")
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#endif
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