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