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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
/*
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* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <fcntl.h>
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#include <sys/prctl.h>
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#include <unistd.h>
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TEST_CASE(check_root)
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{
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auto uid = geteuid();
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// This test only makes sense as root.
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EXPECT_EQ(uid, 0u);
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// Before we make the process dumpable, become "fully" root, so that the user cannot tamper with our memory:
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EXPECT_EQ(setuid(0), 0);
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// If running as setuid, the process is automatically marked as non-dumpable, which bars access to /proc/self/.
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// However, that is the easiest guess for a /proc/$PID/ directory, so we'd like to use that.
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// In order to do so, mark this process as dumpable:
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EXPECT_EQ(prctl(PR_SET_DUMPABLE, 1, 0), 0);
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}
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TEST_CASE(root_writes_to_procfs)
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{
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int fd = open("/proc/self/unveil", O_RDWR | O_APPEND | O_CREAT, 0666); // = 6
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if (fd < 0) {
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perror("open");
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dbgln("fd was {}", fd);
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FAIL("open failed?! See debugout");
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return;
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}
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int rc = write(fd, "hello", 5);
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perror("write");
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dbgln("write rc = {}", rc);
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if (rc >= 0) {
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FAIL("Wrote successfully?!");
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}
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}
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