05ba50f522
constants VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS, USRSTACK and PS_STRINGS. This is mainly so that they can be variable even for the native abi, based on different machine types. Get stack protections from the sysentvec too. This makes it trivial to map the stack non-executable for certain abis, on machines that support it.
494 lines
14 KiB
C
494 lines
14 KiB
C
/*-
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* Copyright (c) 1994 Sean Eric Fagan
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* Copyright (c) 1994 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/fcntl.h>
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#include <sys/imgact.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <i386/ibcs2/coff.h>
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#include <i386/ibcs2/ibcs2_util.h>
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MODULE_DEPEND(coff, ibcs2, 1, 1, 1);
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extern struct sysentvec ibcs2_svr3_sysvec;
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static int coff_load_file(struct thread *td, char *name);
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static int exec_coff_imgact(struct image_params *imgp);
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static int load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot);
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static int
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load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset,
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caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
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{
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size_t map_len;
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vm_offset_t map_offset;
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vm_offset_t map_addr;
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int error;
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unsigned char *data_buf = 0;
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size_t copy_len;
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map_offset = trunc_page(offset);
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map_addr = trunc_page((vm_offset_t)vmaddr);
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if (memsz > filsz) {
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/*
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* We have the stupid situation that
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* the section is longer than it is on file,
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* which means it has zero-filled areas, and
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* we have to work for it. Stupid iBCS!
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*/
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map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
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} else {
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/*
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* The only stuff we care about is on disk, and we
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* don't care if we map in more than is really there.
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*/
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map_len = round_page(offset + filsz) - trunc_page(map_offset);
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}
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DPRINTF(("%s(%d): vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, "
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"VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n",
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__FILE__, __LINE__, map_addr, map_len, prot, map_offset));
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if ((error = vm_mmap(&vmspace->vm_map,
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&map_addr,
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map_len,
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prot,
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VM_PROT_ALL,
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MAP_PRIVATE | MAP_FIXED,
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(caddr_t) vp,
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map_offset)) != 0)
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return error;
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if (memsz == filsz) {
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/* We're done! */
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return 0;
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}
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/*
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* Now we have screwball stuff, to accomodate stupid COFF.
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* We have to map the remaining bit of the file into the kernel's
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* memory map, allocate some anonymous memory, copy that last
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* bit into it, and then we're done. *sigh*
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* For clean-up reasons, we actally map in the file last.
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*/
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copy_len = (offset + filsz) - trunc_page(offset + filsz);
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map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
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map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
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DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx,0x%x, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", __FILE__, __LINE__, map_addr, map_len));
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if (map_len != 0) {
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error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
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map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
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if (error)
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return error;
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}
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if ((error = vm_mmap(kernel_map,
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(vm_offset_t *) &data_buf,
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PAGE_SIZE,
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VM_PROT_READ,
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VM_PROT_READ,
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0,
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(caddr_t) vp,
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trunc_page(offset + filsz))) != 0)
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return error;
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error = copyout(data_buf, (caddr_t) map_addr, copy_len);
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if (vm_map_remove(kernel_map,
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(vm_offset_t) data_buf,
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(vm_offset_t) data_buf + PAGE_SIZE))
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panic("load_coff_section vm_map_remove failed");
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return error;
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}
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static int
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coff_load_file(struct thread *td, char *name)
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{
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struct proc *p = td->td_proc;
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struct vmspace *vmspace = p->p_vmspace;
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int error;
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struct nameidata nd;
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struct vnode *vp;
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struct vattr attr;
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struct filehdr *fhdr;
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struct aouthdr *ahdr;
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struct scnhdr *scns;
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char *ptr = 0;
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int nscns;
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unsigned long text_offset = 0, text_address = 0, text_size = 0;
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unsigned long data_offset = 0, data_address = 0, data_size = 0;
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unsigned long bss_size = 0;
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int i;
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NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, td);
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error = namei(&nd);
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if (error)
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return error;
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vp = nd.ni_vp;
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if (vp == NULL)
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return ENOEXEC;
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if (vp->v_writecount) {
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error = ETXTBSY;
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goto fail;
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}
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if ((error = VOP_GETATTR(vp, &attr, td->td_ucred, td)) != 0)
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goto fail;
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if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
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|| ((attr.va_mode & 0111) == 0)
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|| (attr.va_type != VREG))
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goto fail;
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if (attr.va_size == 0) {
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error = ENOEXEC;
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goto fail;
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}
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if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0)
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goto fail;
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if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td)) != 0)
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goto fail;
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/*
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* Lose the lock on the vnode. It's no longer needed, and must not
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* exist for the pagefault paging to work below.
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*/
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VOP_UNLOCK(vp, 0, td);
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if ((error = vm_mmap(kernel_map,
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(vm_offset_t *) &ptr,
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PAGE_SIZE,
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VM_PROT_READ,
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VM_PROT_READ,
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0,
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(caddr_t) vp,
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0)) != 0)
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goto unlocked_fail;
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fhdr = (struct filehdr *)ptr;
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if (fhdr->f_magic != I386_COFF) {
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error = ENOEXEC;
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goto dealloc_and_fail;
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}
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nscns = fhdr->f_nscns;
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if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
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/*
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* XXX -- just fail. I'm so lazy.
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*/
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error = ENOEXEC;
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goto dealloc_and_fail;
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}
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ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
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scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
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+ sizeof(struct aouthdr));
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for (i = 0; i < nscns; i++) {
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if (scns[i].s_flags & STYP_NOLOAD)
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continue;
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else if (scns[i].s_flags & STYP_TEXT) {
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text_address = scns[i].s_vaddr;
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text_size = scns[i].s_size;
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text_offset = scns[i].s_scnptr;
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}
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else if (scns[i].s_flags & STYP_DATA) {
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data_address = scns[i].s_vaddr;
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data_size = scns[i].s_size;
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data_offset = scns[i].s_scnptr;
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} else if (scns[i].s_flags & STYP_BSS) {
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bss_size = scns[i].s_size;
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}
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}
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if ((error = load_coff_section(vmspace, vp, text_offset,
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(caddr_t)(void *)(uintptr_t)text_address,
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text_size, text_size,
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VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
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goto dealloc_and_fail;
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}
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if ((error = load_coff_section(vmspace, vp, data_offset,
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(caddr_t)(void *)(uintptr_t)data_address,
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data_size + bss_size, data_size,
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VM_PROT_ALL)) != 0) {
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goto dealloc_and_fail;
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}
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error = 0;
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dealloc_and_fail:
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if (vm_map_remove(kernel_map,
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(vm_offset_t) ptr,
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(vm_offset_t) ptr + PAGE_SIZE))
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panic("%s vm_map_remove failed", __func__);
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fail:
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VOP_UNLOCK(vp, 0, td);
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unlocked_fail:
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NDFREE(&nd, NDF_ONLY_PNBUF);
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vrele(nd.ni_vp);
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return error;
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}
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static int
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exec_coff_imgact(imgp)
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struct image_params *imgp;
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{
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const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
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const struct aouthdr *ahdr;
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const struct scnhdr *scns;
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int i;
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struct vmspace *vmspace;
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int nscns;
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int error;
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unsigned long text_offset = 0, text_address = 0, text_size = 0;
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unsigned long data_offset = 0, data_address = 0, data_size = 0;
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unsigned long bss_size = 0;
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caddr_t hole;
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struct thread *td = curthread;
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if (fhdr->f_magic != I386_COFF ||
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!(fhdr->f_flags & F_EXEC)) {
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DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
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return -1;
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}
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nscns = fhdr->f_nscns;
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if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
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/*
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* For now, return an error -- need to be able to
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* read in all of the section structures.
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*/
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DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
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return -1;
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}
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ahdr = (const struct aouthdr*)
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((const char*)(imgp->image_header) + sizeof(struct filehdr));
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imgp->entry_addr = ahdr->entry;
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scns = (const struct scnhdr*)
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((const char*)(imgp->image_header) + sizeof(struct filehdr) +
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sizeof(struct aouthdr));
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VOP_UNLOCK(imgp->vp, 0, td);
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if ((error = exec_extract_strings(imgp)) != 0) {
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DPRINTF(("%s(%d): return %d\n", __FILE__, __LINE__, error));
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goto fail;
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}
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exec_new_vmspace(imgp, &ibcs2_svr3_sysvec);
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vmspace = imgp->proc->p_vmspace;
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for (i = 0; i < nscns; i++) {
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DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
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"scns[i].s_scnptr = %d\n", i, scns[i].s_name,
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scns[i].s_vaddr, scns[i].s_scnptr));
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if (scns[i].s_flags & STYP_NOLOAD) {
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/*
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* A section that is not loaded, for whatever
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* reason. It takes precedance over other flag
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* bits...
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*/
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continue;
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} else if (scns[i].s_flags & STYP_TEXT) {
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text_address = scns[i].s_vaddr;
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text_size = scns[i].s_size;
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text_offset = scns[i].s_scnptr;
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} else if (scns[i].s_flags & STYP_DATA) {
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/* .data section */
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data_address = scns[i].s_vaddr;
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data_size = scns[i].s_size;
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data_offset = scns[i].s_scnptr;
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} else if (scns[i].s_flags & STYP_BSS) {
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/* .bss section */
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bss_size = scns[i].s_size;
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} else if (scns[i].s_flags & STYP_LIB) {
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char *buf = 0;
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int foff = trunc_page(scns[i].s_scnptr);
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int off = scns[i].s_scnptr - foff;
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int len = round_page(scns[i].s_size + PAGE_SIZE);
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int j;
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if ((error = vm_mmap(kernel_map,
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(vm_offset_t *) &buf,
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len,
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VM_PROT_READ,
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VM_PROT_READ,
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0,
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(caddr_t) imgp->vp,
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foff)) != 0) {
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error = ENOEXEC;
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goto fail;
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}
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if(scns[i].s_size) {
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char *libbuf;
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int emul_path_len = strlen(ibcs2_emul_path);
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libbuf = malloc(MAXPATHLEN + emul_path_len,
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M_TEMP, M_WAITOK);
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strcpy(libbuf, ibcs2_emul_path);
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for (j = off; j < scns[i].s_size + off;) {
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long stroff, nextoff;
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char *libname;
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nextoff = 4 * *(long *)(buf + j);
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stroff = 4 * *(long *)(buf + j + sizeof(long));
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libname = buf + j + stroff;
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j += nextoff;
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DPRINTF(("%s(%d): shared library %s\n",
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__FILE__, __LINE__, libname));
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strcpy(&libbuf[emul_path_len], libname);
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/* XXXKSE only 1:1 in coff */ error = coff_load_file(
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FIRST_THREAD_IN_PROC(imgp->proc), libbuf);
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if (error)
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error = coff_load_file(
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FIRST_THREAD_IN_PROC(imgp->proc),
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libname);
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if (error)
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break;
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}
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free(libbuf, M_TEMP);
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}
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if (vm_map_remove(kernel_map,
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(vm_offset_t) buf,
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(vm_offset_t) buf + len))
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panic("exec_coff_imgact vm_map_remove failed");
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if (error)
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goto fail;
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}
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}
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/*
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* Map in .text now
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*/
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DPRINTF(("%s(%d): load_coff_section(vmspace, "
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"imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
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__FILE__, __LINE__, text_offset, text_address,
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text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
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if ((error = load_coff_section(vmspace, imgp->vp,
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text_offset,
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(caddr_t)(void *)(uintptr_t)text_address,
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text_size, text_size,
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VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
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DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
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goto fail;
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}
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/*
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* Map in .data and .bss now
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*/
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DPRINTF(("%s(%d): load_coff_section(vmspace, "
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"imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
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__FILE__, __LINE__, data_offset, data_address,
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data_size + bss_size, data_size, VM_PROT_ALL));
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if ((error = load_coff_section(vmspace, imgp->vp,
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data_offset,
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(caddr_t)(void *)(uintptr_t)data_address,
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data_size + bss_size, data_size,
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VM_PROT_ALL)) != 0) {
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DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
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goto fail;
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}
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imgp->interpreted = 0;
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imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
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vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
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vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
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vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
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vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
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hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
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DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
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__FILE__, __LINE__, hole));
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DPRINTF(("imgact: error = %d\n", error));
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|
|
|
error = vm_map_find(&vmspace->vm_map, NULL, 0,
|
|
(vm_offset_t *) &hole, PAGE_SIZE, FALSE,
|
|
VM_PROT_ALL, VM_PROT_ALL, 0);
|
|
|
|
DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
|
|
ctob(vmspace->vm_dsize), vmspace->vm_daddr,
|
|
ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
|
|
DPRINTF(("%s(%d): returning successfully!\n", __FILE__, __LINE__));
|
|
|
|
fail:
|
|
vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Tell kern_execve.c about it, with a little help from the linker.
|
|
*/
|
|
static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
|
|
EXEC_SET(coff, coff_execsw);
|