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Userland: Add test for file SUID+SGID bits stripped when modified
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Userland/Tests/Kernel/filesystem-strips-file-suid-sgid-bits-when-modified.cpp
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/* | ||
* Copyright (c) 2020, the SerenityOS developers. | ||
* All rights reserved. | ||
* | ||
* Redistribution and use in source and binary forms, with or without | ||
* modification, are permitted provided that the following conditions are met: | ||
* | ||
* 1. Redistributions of source code must retain the above copyright notice, this | ||
* list of conditions and the following disclaimer. | ||
* | ||
* 2. Redistributions in binary form must reproduce the above copyright notice, | ||
* this list of conditions and the following disclaimer in the documentation | ||
* and/or other materials provided with the distribution. | ||
* | ||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | ||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | ||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
*/ | ||
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#include <assert.h> | ||
#include <fcntl.h> | ||
#include <stdio.h> | ||
#include <stdlib.h> | ||
#include <string.h> | ||
#include <sys/stat.h> | ||
#include <sys/types.h> | ||
#include <unistd.h> | ||
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static void test_change_file_contents() | ||
{ | ||
const char* path = "suid"; | ||
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int fd = open(path, O_CREAT | O_RDWR, 06755); | ||
assert(fd != -1); | ||
ftruncate(fd, 0); | ||
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char buffer[8]; | ||
memset(&buffer, 0, sizeof(buffer)); | ||
write(fd, buffer, sizeof(buffer)); | ||
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struct stat s; | ||
assert(fstat(fd, &s) != -1); | ||
close(fd); | ||
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assert(s.st_mode & ~S_ISUID); | ||
assert(s.st_mode & ~S_ISGID); | ||
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unlink(path); | ||
} | ||
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static void test_change_file_ownership() | ||
{ | ||
const char* path = "suid"; | ||
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int fd = open(path, O_CREAT | O_RDWR, 06755); | ||
assert(fd != -1); | ||
ftruncate(fd, 0); | ||
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fchown(fd, getuid(), getgid()); | ||
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struct stat s; | ||
assert(fstat(fd, &s) != -1); | ||
close(fd); | ||
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assert(s.st_mode & ~S_ISUID); | ||
assert(s.st_mode & ~S_ISGID); | ||
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unlink(path); | ||
} | ||
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static void test_change_file_permissions() | ||
{ | ||
const char* path = "suid"; | ||
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int fd = open(path, O_CREAT | O_RDWR, 06755); | ||
assert(fd != -1); | ||
ftruncate(fd, 0); | ||
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fchmod(fd, 0755); | ||
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struct stat s; | ||
assert(fstat(fd, &s) != -1); | ||
close(fd); | ||
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assert(s.st_mode & ~S_ISUID); | ||
assert(s.st_mode & ~S_ISGID); | ||
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unlink(path); | ||
} | ||
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int main() | ||
{ | ||
#define RUNTEST(x) \ | ||
{ \ | ||
printf("Running " #x " ...\n"); \ | ||
x(); \ | ||
printf("Success!\n"); \ | ||
} | ||
RUNTEST(test_change_file_contents); | ||
RUNTEST(test_change_file_ownership); | ||
RUNTEST(test_change_file_permissions); | ||
printf("PASS\n"); | ||
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return 0; | ||
} |