FreeBSD/Linux Kernel Cross Reference
sys/dev/firmload.c
1 /* $OpenBSD: firmload.c,v 1.9 2008/03/08 19:15:26 espie 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 #ifdef RAMDISK_HOOKS
58 /* try again with mounted disk */
59 if (error) {
60 if (snprintf(path, MAXPATHLEN, "/mnt/etc/firmware/%s", name) >=
61 MAXPATHLEN) {
62 error = ENAMETOOLONG;
63 goto err;
64 }
65
66 NDINIT(&nid, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, path, p);
67 error = namei(&nid);
68 }
69 #endif
70 if (error)
71 goto err;
72 error = VOP_GETATTR(nid.ni_vp, &va, p->p_ucred, p);
73 if (error)
74 goto fail;
75 if (nid.ni_vp->v_type != VREG || va.va_size == 0) {
76 error = EINVAL;
77 goto fail;
78 }
79 if (va.va_size > FIRMWARE_MAX) {
80 error = E2BIG;
81 goto fail;
82 }
83 ptr = malloc(va.va_size, M_DEVBUF, M_NOWAIT);
84 if (ptr == NULL) {
85 error = ENOMEM;
86 goto fail;
87 }
88
89 iov.iov_base = ptr;
90 iov.iov_len = va.va_size;
91 uio.uio_iov = &iov;
92 uio.uio_iovcnt = 1;
93 uio.uio_offset = 0;
94 uio.uio_resid = va.va_size;
95 uio.uio_segflg = UIO_SYSSPACE;
96 uio.uio_rw = UIO_READ;
97 uio.uio_procp = p;
98
99 error = VOP_READ(nid.ni_vp, &uio, 0, p->p_ucred);
100
101 if (error == 0) {
102 *bufp = ptr;
103 *buflen = va.va_size;
104 } else
105 free(ptr, M_DEVBUF);
106
107 fail:
108 vput(nid.ni_vp);
109 err:
110 if (path)
111 free(path, M_TEMP);
112 return (error);
113 }
Cache object: ee4032054590ea60bed0269ff25b9beb
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