X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/fe8ab488e9161c46dd9885d58fc52996dc0249ff..eb6b6ca394357805f2bdba989abae309f718b4d8:/bsd/dev/random/randomdev.c?ds=sidebyside diff --git a/bsd/dev/random/randomdev.c b/bsd/dev/random/randomdev.c index 1b96f774c..7e5e10e3e 100644 --- a/bsd/dev/random/randomdev.c +++ b/bsd/dev/random/randomdev.c @@ -2,7 +2,7 @@ * Copyright (c) 1999-2009 Apple, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ - * + * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in @@ -11,10 +11,10 @@ * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. - * + * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. - * + * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, @@ -22,7 +22,7 @@ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. - * + * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ @@ -40,6 +40,7 @@ #include #include #include +#include #include #include @@ -61,20 +62,20 @@ d_ioctl_t random_ioctl; */ static struct cdevsw random_cdevsw = { - random_open, /* open */ - random_close, /* close */ - random_read, /* read */ - random_write, /* write */ - random_ioctl, /* ioctl */ + random_open, /* open */ + random_close, /* close */ + random_read, /* read */ + random_write, /* write */ + random_ioctl, /* ioctl */ (stop_fcn_t *)nulldev, /* stop */ (reset_fcn_t *)nulldev, /* reset */ - NULL, /* tty's */ - eno_select, /* select */ - eno_mmap, /* mmap */ - eno_strat, /* strategy */ - eno_getc, /* getc */ - eno_putc, /* putc */ - 0 /* type */ + NULL, /* tty's */ + eno_select, /* select */ + eno_mmap, /* mmap */ + eno_strat, /* strategy */ + eno_getc, /* getc */ + eno_putc, /* putc */ + 0 /* type */ }; @@ -92,21 +93,20 @@ random_init(void) panic("random_init: failed to allocate a major number!"); } - devfs_make_node(makedev (ret, RANDOM_MINOR), DEVFS_CHAR, - UID_ROOT, GID_WHEEL, 0666, "random", 0); + devfs_make_node(makedev(ret, RANDOM_MINOR), DEVFS_CHAR, + UID_ROOT, GID_WHEEL, 0666, "random", 0); /* - * also make urandom + * also make urandom * (which is exactly the same thing in our context) */ - devfs_make_node(makedev (ret, URANDOM_MINOR), DEVFS_CHAR, - UID_ROOT, GID_WHEEL, 0666, "urandom", 0); - + devfs_make_node(makedev(ret, URANDOM_MINOR), DEVFS_CHAR, + UID_ROOT, GID_WHEEL, 0666, "urandom", 0); } int -random_ioctl( __unused dev_t dev, u_long cmd, __unused caddr_t data, - __unused int flag, __unused struct proc *p ) +random_ioctl( __unused dev_t dev, u_long cmd, __unused caddr_t data, + __unused int flag, __unused struct proc *p ) { switch (cmd) { case FIONBIO: @@ -116,14 +116,14 @@ random_ioctl( __unused dev_t dev, u_long cmd, __unused caddr_t data, return ENODEV; } - return (0); + return 0; } /* * Open the device. Make sure init happened, and make sure the caller is * authorized. */ - + int random_open(__unused dev_t dev, int flags, __unused int devtype, __unused struct proc *p) { @@ -132,26 +132,28 @@ random_open(__unused dev_t dev, int flags, __unused int devtype, __unused struct * make sure that we have privledges do so */ if (flags & FWRITE) { - if (securelevel >= 2) - return (EPERM); + if (securelevel >= 2) { + return EPERM; + } #ifndef __APPLE__ - if ((securelevel >= 1) && proc_suser(p)) - return (EPERM); -#endif /* !__APPLE__ */ + if ((securelevel >= 1) && proc_suser(p)) { + return EPERM; + } +#endif /* !__APPLE__ */ } - return (0); + return 0; } /* * close the device. */ - + int random_close(__unused dev_t dev, __unused int flags, __unused int mode, __unused struct proc *p) { - return (0); + return 0; } @@ -160,34 +162,37 @@ random_close(__unused dev_t dev, __unused int flags, __unused int mode, __unused * prng. */ int -random_write (dev_t dev, struct uio *uio, __unused int ioflag) +random_write(dev_t dev, struct uio *uio, __unused int ioflag) { - int retCode = 0; - char rdBuffer[256]; - - if (minor(dev) != RANDOM_MINOR) - return EPERM; - - /* Security server is sending us entropy */ - - while (uio_resid(uio) > 0 && retCode == 0) { - /* get the user's data */ - int bytesToInput = MIN(uio_resid(uio), - (user_ssize_t) sizeof(rdBuffer)); - retCode = uiomove(rdBuffer, bytesToInput, uio); - if (retCode != 0) - break; - retCode = write_random(rdBuffer, bytesToInput); - if (retCode != 0) - break; - } - - return retCode; + int retCode = 0; + char rdBuffer[256]; + + if (minor(dev) != RANDOM_MINOR) { + return EPERM; + } + + /* Security server is sending us entropy */ + + while (uio_resid(uio) > 0 && retCode == 0) { + /* get the user's data */ + int bytesToInput = MIN(uio_resid(uio), + (user_ssize_t) sizeof(rdBuffer)); + retCode = uiomove(rdBuffer, bytesToInput, uio); + if (retCode != 0) { + break; + } + retCode = write_random(rdBuffer, bytesToInput); + if (retCode != 0) { + break; + } + } + + return retCode; } /* * return data to the caller. Results unpredictable. - */ + */ int random_read(__unused dev_t dev, struct uio *uio, __unused int ioflag) { @@ -197,16 +202,17 @@ random_read(__unused dev_t dev, struct uio *uio, __unused int ioflag) user_ssize_t bytes_remaining = uio_resid(uio); while (bytes_remaining > 0 && retCode == 0) { int bytesToRead = MIN(bytes_remaining, - (user_ssize_t) sizeof(buffer)); + (user_ssize_t) sizeof(buffer)); read_random(buffer, bytesToRead); - + retCode = uiomove(buffer, bytesToRead, uio); - if (retCode != 0) + if (retCode != 0) { break; - + } + bytes_remaining = uio_resid(uio); } - + return retCode; } @@ -217,7 +223,26 @@ u_int32_t RandomULong(void) { u_int32_t buf; - read_random(&buf, sizeof (buf)); - return (buf); + read_random(&buf, sizeof(buf)); + return buf; } + +int +getentropy(__unused struct proc * p, struct getentropy_args *gap, __unused int * ret) +{ + user_addr_t user_addr; + uint32_t user_size; + char buffer[256]; + + user_addr = (vm_map_offset_t)gap->buffer; + user_size = gap->size; + /* Can't request more than 256 random bytes + * at once. Complying with openbsd getentropy() + */ + if (user_size > sizeof(buffer)) { + return EINVAL; + } + read_random(buffer, user_size); + return copyout(buffer, user_addr, user_size); +}