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Annotation of sys/dev/firmload.c, Revision 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: }