70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
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* Author: Yang Xu <xuyang2018.jy@cn.fujitsu.com
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*
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* ptrace() returns -1 and sets errno to EPERM if tracer doesn't have
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* CAP_SYS_PTRACE capability for the process. Such as nobody user.
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*/
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#include <errno.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <pwd.h>
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#include <config.h>
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#include <stdlib.h>
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#include "ptrace.h"
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#include "tst_test.h"
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uid_t uid;
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static void verify_ptrace(void)
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{
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int child_pid[2];
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child_pid[0] = SAFE_FORK();
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if (!child_pid[0])
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pause();
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child_pid[1] = SAFE_FORK();
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if (!child_pid[1]) {
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SAFE_SETUID(uid);
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TEST(ptrace(PTRACE_ATTACH, child_pid[0], NULL, NULL));
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if (TST_RET == 0) {
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tst_res(TFAIL, "ptrace() succeeded unexpectedly");
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exit(0);
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}
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if (TST_RET != -1) {
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tst_res(TFAIL,
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"Invalid ptrace() return value %ld", TST_RET);
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exit(0);
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}
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if (TST_ERR == EPERM)
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tst_res(TPASS | TTERRNO, "ptrace() failed as expected");
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else
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tst_res(TFAIL | TTERRNO, "ptrace() expected EPERM, but got");
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exit(0);
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}
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SAFE_WAITPID(child_pid[1], NULL, 0);
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SAFE_KILL(child_pid[0], SIGKILL);
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SAFE_WAITPID(child_pid[0], NULL, 0);
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}
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static void setup(void)
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{
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struct passwd *pw;
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pw = SAFE_GETPWNAM("nobody");
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uid = pw->pw_uid;
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}
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static struct tst_test test = {
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.setup = setup,
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.test_all = verify_ptrace,
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.forks_child = 1,
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.needs_root = 1,
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};
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