Annotation of sys/dev/firmload.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: firmload.c,v 1.8 2006/06/27 03:51:29 pedro Exp $ */
2:
3: /*
4: * Copyright (c) 2004 Theo de Raadt <deraadt@openbsd.org>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/param.h>
20: #include <sys/systm.h>
21: #include <sys/syslimits.h>
22: #include <sys/time.h>
23: #include <sys/namei.h>
24: #include <sys/vnode.h>
25: #include <sys/mount.h>
26: #include <sys/errno.h>
27: #include <sys/malloc.h>
28: #include <sys/proc.h>
29: #include <sys/device.h>
30:
31: int
32: loadfirmware(const char *name, u_char **bufp, size_t *buflen)
33: {
34: struct proc *p = curproc;
35: struct nameidata nid;
36: char *path, *ptr;
37: struct iovec iov;
38: struct uio uio;
39: struct vattr va;
40: int error;
41:
42: if (!rootvp || !vcount(rootvp))
43: return (EIO);
44:
45: path = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT);
46: if (path == NULL)
47: return (ENOMEM);
48:
49: if (snprintf(path, MAXPATHLEN, "/etc/firmware/%s", name) >=
50: MAXPATHLEN) {
51: error = ENAMETOOLONG;
52: goto err;
53: }
54:
55: NDINIT(&nid, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, path, p);
56: error = namei(&nid);
57: if (error)
58: goto err;
59: error = VOP_GETATTR(nid.ni_vp, &va, p->p_ucred, p);
60: if (error)
61: goto fail;
62: if (nid.ni_vp->v_type != VREG || va.va_size == 0) {
63: error = EINVAL;
64: goto fail;
65: }
66: if (va.va_size > FIRMWARE_MAX) {
67: error = E2BIG;
68: goto fail;
69: }
70: ptr = malloc(va.va_size, M_DEVBUF, M_NOWAIT);
71: if (ptr == NULL) {
72: error = ENOMEM;
73: goto fail;
74: }
75:
76: iov.iov_base = ptr;
77: iov.iov_len = va.va_size;
78: uio.uio_iov = &iov;
79: uio.uio_iovcnt = 1;
80: uio.uio_offset = 0;
81: uio.uio_resid = va.va_size;
82: uio.uio_segflg = UIO_SYSSPACE;
83: uio.uio_rw = UIO_READ;
84: uio.uio_procp = p;
85:
86: error = VOP_READ(nid.ni_vp, &uio, 0, p->p_ucred);
87:
88: if (error == 0) {
89: *bufp = ptr;
90: *buflen = va.va_size;
91: } else
92: free(ptr, M_DEVBUF);
93:
94: fail:
95: vput(nid.ni_vp);
96: err:
97: if (path)
98: free(path, M_TEMP);
99: return (error);
100: }
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