116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/* $OpenBSD: firmload.c,v 1.16 2018/08/13 23:12:39 deraadt Exp $ */
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/*
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* Copyright (c) 2004 Theo de Raadt <deraadt@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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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/syslimits.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/device.h>
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#include <sys/pledge.h>
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int
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loadfirmware(const char *name, u_char **bufp, size_t *buflen)
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{
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struct proc *p = curproc;
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struct nameidata nid;
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char *path, *ptr;
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struct iovec iov;
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struct uio uio;
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struct vattr va;
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int error;
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if (!rootvp || !vcount(rootvp))
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return (EIO);
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path = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT);
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if (path == NULL)
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return (ENOMEM);
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if (snprintf(path, MAXPATHLEN, "/etc/firmware/%s", name) >=
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MAXPATHLEN) {
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error = ENAMETOOLONG;
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goto err;
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}
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NDINIT(&nid, LOOKUP, NOFOLLOW|LOCKLEAF|KERNELPATH,
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UIO_SYSSPACE, path, p);
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nid.ni_pledge = PLEDGE_RPATH;
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error = namei(&nid);
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#ifdef RAMDISK_HOOKS
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/* try again with mounted disk */
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if (error) {
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if (snprintf(path, MAXPATHLEN, "/mnt/etc/firmware/%s", name) >=
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MAXPATHLEN) {
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error = ENAMETOOLONG;
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goto err;
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}
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NDINIT(&nid, LOOKUP, NOFOLLOW|LOCKLEAF|KERNELPATH,
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UIO_SYSSPACE, path, p);
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nid.ni_pledge = PLEDGE_RPATH;
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error = namei(&nid);
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}
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#endif
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if (error)
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goto err;
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error = VOP_GETATTR(nid.ni_vp, &va, p->p_ucred, p);
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if (error)
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goto fail;
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if (nid.ni_vp->v_type != VREG || va.va_size == 0) {
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error = EINVAL;
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goto fail;
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}
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if (va.va_size > FIRMWARE_MAX) {
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error = E2BIG;
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goto fail;
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}
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ptr = malloc(va.va_size, M_DEVBUF, M_NOWAIT);
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if (ptr == NULL) {
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error = ENOMEM;
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goto fail;
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}
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iov.iov_base = ptr;
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iov.iov_len = va.va_size;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = 0;
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uio.uio_resid = va.va_size;
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uio.uio_segflg = UIO_SYSSPACE;
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uio.uio_rw = UIO_READ;
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uio.uio_procp = p;
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error = VOP_READ(nid.ni_vp, &uio, 0, p->p_ucred);
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if (error == 0) {
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*bufp = ptr;
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*buflen = va.va_size;
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} else
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free(ptr, M_DEVBUF, va.va_size);
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fail:
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vput(nid.ni_vp);
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err:
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free(path, M_TEMP, MAXPATHLEN);
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return (error);
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}
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