/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 1994-1996 Søren Schmidt * All rights reserved. * * Based heavily on /sys/kern/imgact_aout.c which is: * Copyright (c) 1993, David Greenman * * 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 AUTHOR 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 AUTHOR 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int exec_linux_imgact(struct image_params *iparams); static int exec_linux_imgact(struct image_params *imgp) { const struct exec *a_out = (const struct exec *) imgp->image_header; struct vmspace *vmspace; vm_offset_t vmaddr; unsigned long virtual_offset, file_offset; unsigned long bss_size; ssize_t aresid; int error; if (((a_out->a_magic >> 16) & 0xff) != 0x64) return (-1); /* * Set file/virtual offset based on a.out variant. */ switch ((int)(a_out->a_magic & 0xffff)) { case 0413: virtual_offset = 0; file_offset = 1024; break; case 0314: virtual_offset = 4096; file_offset = 0; break; default: return (-1); } bss_size = round_page(a_out->a_bss); #ifdef DEBUG printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n", (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size); #endif /* * Check various fields in header for validity/bounds. */ if (a_out->a_entry < virtual_offset || a_out->a_entry >= virtual_offset + a_out->a_text || a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) return (-1); /* text + data can't exceed file size */ if (a_out->a_data + a_out->a_text > imgp->attr->va_size) return (EFAULT); /* * text/data/bss must not exceed limits */ PROC_LOCK(imgp->proc); if (a_out->a_text > maxtsiz || a_out->a_data + bss_size > lim_cur_proc(imgp->proc, RLIMIT_DATA) || racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) { PROC_UNLOCK(imgp->proc); return (ENOMEM); } PROC_UNLOCK(imgp->proc); VOP_UNLOCK(imgp->vp); /* * Destroy old process VM and create a new one (with a new stack) */ error = exec_new_vmspace(imgp, &linux_sysvec); if (error) goto fail; vmspace = imgp->proc->p_vmspace; /* * Check if file_offset page aligned,. * Currently we cannot handle misaligned file offsets, * and so we read in the entire image (what a waste). */ if (file_offset & PAGE_MASK) { #ifdef DEBUG printf("imgact: Non page aligned binary %lu\n", file_offset); #endif /* * Map text+data+bss read/write/execute */ vmaddr = virtual_offset; error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, a_out->a_text + a_out->a_data + bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0); if (error) goto fail; error = vn_rdwr(UIO_READ, imgp->vp, (void *)vmaddr, file_offset, a_out->a_text + a_out->a_data, UIO_USERSPACE, 0, curthread->td_ucred, NOCRED, &aresid, curthread); if (error != 0) goto fail; if (aresid != 0) { error = ENOEXEC; goto fail; } /* * remove write enable on the 'text' part */ error = vm_map_protect(&vmspace->vm_map, vmaddr, vmaddr + a_out->a_text, 0, VM_PROT_EXECUTE | VM_PROT_READ, VM_MAP_PROTECT_SET_MAXPROT); if (error) goto fail; } else { #ifdef DEBUG printf("imgact: Page aligned binary %lu\n", file_offset); #endif /* * Map text+data read/execute */ vmaddr = virtual_offset; error = vm_mmap(&vmspace->vm_map, &vmaddr, a_out->a_text + a_out->a_data, VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, imgp->vp, file_offset); if (error) goto fail; #ifdef DEBUG printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr, (u_long)a_out->a_text + (u_long)a_out->a_data); #endif /* * allow read/write of data */ error = vm_map_protect(&vmspace->vm_map, vmaddr + a_out->a_text, vmaddr + a_out->a_text + a_out->a_data, VM_PROT_ALL, 0, VM_MAP_PROTECT_SET_PROT); if (error) goto fail; /* * Allocate anon demand-zeroed area for uninitialized data */ if (bss_size != 0) { vmaddr = virtual_offset + a_out->a_text + a_out->a_data; error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0); if (error) goto fail; #ifdef DEBUG printf("imgact: bssaddr=%08lx, length=%08lx\n", (u_long)vmaddr, bss_size); #endif } } /* Fill in process VM information */ vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT; vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT; vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset; vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)(virtual_offset + a_out->a_text); error = exec_map_stack(imgp); if (error != 0) goto fail; /* Fill in image_params */ imgp->interpreted = 0; imgp->entry_addr = a_out->a_entry; imgp->proc->p_sysent = &linux_sysvec; fail: vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); return (error); } /* * Tell kern_execve.c about it, with a little help from the linker. */ static struct execsw linux_execsw = { exec_linux_imgact, "Linux a.out" }; EXEC_SET(linuxaout, linux_execsw);