[ipxe-devel] [PATCH] [efi] Allow iPXE's own command line to be executed as a script
Ladi Prosek
lprosek at redhat.com
Thu May 18 09:52:47 UTC 2017
On Thu, May 18, 2017 at 11:47 AM, Christian Nilsson <nikize at gmail.com> wrote:
> It needs some fixes before merge, but have not gotten around to it
Thanks. I wrote a similar patch before I saw this one so I was
wondering why this didn't get any responses. I'll try to post mine and
keep you cc'ed.
> On 18 May 2017 11:41, "Ladi Prosek" <lprosek at redhat.com> wrote:
>>
>> On Sun, Dec 11, 2016 at 2:10 AM, Christian Nilsson <nikize at gmail.com>
>> wrote:
>> > cmdline part is copied over from pcbios functionallity
>> >
>> > Signed-off-by: Christian Nilsson <nikize at gmail.com>
>> > ---
>> > src/config/config_efi.c | 2 +
>> > src/include/ipxe/errfile.h | 1 +
>> > src/interface/efi/efi_runtime.c | 177
>> > ++++++++++++++++++++++++++++++++++++++++
>> > 3 files changed, 180 insertions(+)
>> > create mode 100644 src/interface/efi/efi_runtime.c
>> >
>> > diff --git a/src/config/config_efi.c b/src/config/config_efi.c
>> > index 92678d1..161019a 100644
>> > --- a/src/config/config_efi.c
>> > +++ b/src/config/config_efi.c
>> > @@ -49,3 +49,5 @@ REQUIRE_OBJECT ( efi_fbcon );
>> > #ifdef DOWNLOAD_PROTO_FILE
>> > REQUIRE_OBJECT ( efi_local );
>> > #endif
>> > +
>> > +REQUIRE_OBJECT ( efi_runtime );
>> > diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h
>> > index d0b93d0..a8ea9d1 100644
>> > --- a/src/include/ipxe/errfile.h
>> > +++ b/src/include/ipxe/errfile.h
>> > @@ -361,6 +361,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
>> > #define ERRFILE_efi_local ( ERRFILE_OTHER | 0x004d0000 )
>> > #define ERRFILE_efi_entropy ( ERRFILE_OTHER | 0x004e0000 )
>> > #define ERRFILE_cert_cmd ( ERRFILE_OTHER | 0x004f0000 )
>> > +#define ERRFILE_efi_runtime ( ERRFILE_OTHER | 0x00500000 )
>> >
>> > /** @} */
>> >
>> > diff --git a/src/interface/efi/efi_runtime.c
>> > b/src/interface/efi/efi_runtime.c
>> > new file mode 100644
>> > index 0000000..bc7ff82
>> > --- /dev/null
>> > +++ b/src/interface/efi/efi_runtime.c
>> > @@ -0,0 +1,177 @@
>> > +/*
>> > + * Copyright (C) 2011 Michael Brown <mbrown at fensystems.co.uk>.
>> > + *
>> > + * This program is free software; you can redistribute it and/or
>> > + * modify it under the terms of the GNU General Public License as
>> > + * published by the Free Software Foundation; either version 2 of the
>> > + * License, or any later version.
>> > + *
>> > + * This program is distributed in the hope that it will be useful, but
>> > + * WITHOUT ANY WARRANTY; without even the implied warranty of
>> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> > + * General Public License for more details.
>> > + *
>> > + * You should have received a copy of the GNU General Public License
>> > + * along with this program; if not, write to the Free Software
>> > + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
>> > + * 02110-1301, USA.
>> > + *
>> > + * You can also choose to distribute this program under the terms of
>> > + * the Unmodified Binary Distribution Licence (as given in the file
>> > + * COPYING.UBDL), provided that you have satisfied its requirements.
>> > + */
>> > +
>> > +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
>> > +
>> > +/** @file
>> > + *
>> > + * Command line passed to iPXE at runtime
>> > + *
>> > + */
>> > +
>> > +#include <stdio.h>
>> > +#include <stdlib.h>
>> > +#include <ctype.h>
>> > +#include <errno.h>
>> > +#include <ipxe/init.h>
>> > +#include <ipxe/image.h>
>> > +#include <ipxe/script.h>
>> > +#include <ipxe/efi/efi.h>
>> > +
>> > +/** Internal copy of the command line */
>> > +static char *cmdline_copy;
>> > +
>> > +/** Free command line image */
>> > +static void cmdline_image_free ( struct refcnt *refcnt ) {
>> > + struct image *image = container_of ( refcnt, struct image,
>> > refcnt );
>> > +
>> > + DBGC ( image, "RUNTIME freeing command line\n" );
>> > + free ( cmdline_copy );
>> > +}
>> > +
>> > +/** Embedded script representing the command line */
>> > +static struct image cmdline_image = {
>> > + .refcnt = REF_INIT ( cmdline_image_free ),
>> > + .name = "<CMDLINE>",
>> > + .type = &script_image_type,
>> > +};
>> > +
>> > +/** Colour for debug messages */
>> > +#define colour &cmdline_image
>> > +
>> > +/**
>> > + * Strip unwanted cruft from command line
>> > + *
>> > + * @v cmdline Command line
>> > + * @v cruft Initial substring of cruft to strip
>> > + */
>> > +static void cmdline_strip ( char *cmdline, const char *cruft ) {
>> > + char *strip;
>> > + char *strip_end;
>> > +
>> > + /* Find unwanted cruft, if present */
>> > + if ( ! ( strip = strstr ( cmdline, cruft ) ) )
>> > + return;
>> > +
>> > + /* Strip unwanted cruft */
>> > + strip_end = strchr ( strip, ' ' );
>> > + if ( strip_end ) {
>> > + *strip_end = '\0';
>> > + DBGC ( colour, "RUNTIME stripping \"%s\"\n", strip );
>> > + strcpy ( strip, ( strip_end + 1 ) );
>> > + } else {
>> > + DBGC ( colour, "RUNTIME stripping \"%s\"\n", strip );
>> > + *strip = '\0';
>> > + }
>> > +}
>> > +
>> > +/**
>> > + * Initialise command line
>> > + *
>> > + * @ret rc Return status code
>> > + */
>> > +static int cmdline_init ( void ) {
>> > + EFI_LOADED_IMAGE_PROTOCOL *loaded = efi_loaded_image;
>> > + size_t cmdline_len = ( loaded->LoadOptionsSize / sizeof (
>> > wchar_t ) );
>> > + char cmdline_efi[ cmdline_len + 1 /* NUL */ ];
>> > + const wchar_t *wcmdline = loaded->LoadOptions;
>> > + char *cmdline;
>> > + size_t len;
>> > + int rc;
>> > +
>> > + /* Convert command line to ASCII */
>> > + snprintf ( cmdline_efi, sizeof ( cmdline_efi ), "%ls", wcmdline
>> > );
>> > +
>> > + /* Do nothing if no command line was specified */
>> > + if ( ! cmdline_efi ) {
>> > + DBGC ( colour, "RUNTIME found no command line\n" );
>> > + return 0;
>> > + }
>> > + len = ( strlen ( cmdline_efi ) + 1 /* NUL */ );
>> > +
>> > + /* Allocate and copy command line */
>> > + cmdline_copy = malloc ( len );
>> > + if ( ! cmdline_copy ) {
>> > + DBGC ( colour, "RUNTIME could not allocate %zd bytes for
>> > "
>> > + "command line\n", len );
>> > + rc = -ENOMEM;
>> > + goto err_alloc_cmdline_copy;
>> > + }
>> > + cmdline = cmdline_copy;
>> > + strcpy ( cmdline, cmdline_efi );
>> > + DBGC ( colour, "RUNTIME found command line \"%s\"\n",
>> > + cmdline );
>> > +
>> > + /* Check for unwanted cruft in the command line */
>> > + while ( isspace ( *cmdline ) )
>> > + cmdline++;
>> > + /* skip program name, efi always add it first */
>> > + while ( ! isspace ( *cmdline ) )
>> > + cmdline++;
>> > + /* Strip unwanted cruft from the command line */
>> > + cmdline_strip ( cmdline, "BOOT_IMAGE=" );
>> > + cmdline_strip ( cmdline, "initrd=" );
>> > + while ( isspace ( *cmdline ) )
>> > + cmdline++;
>> > + DBGC ( colour, "RUNTIME using command line \"%s\"\n", cmdline );
>> > +
>> > + /* Prepare and register image */
>> > + cmdline_image.data = virt_to_user ( cmdline );
>> > + cmdline_image.len = strlen ( cmdline );
>> > + if ( cmdline_image.len ) {
>> > + if ( ( rc = register_image ( &cmdline_image ) ) != 0 ) {
>> > + DBGC ( colour, "RUNTIME could not register
>> > command "
>> > + "line: %s\n", strerror ( rc ) );
>> > + goto err_register_image;
>> > + }
>> > + }
>> > +
>> > + /* Drop our reference to the image */
>> > + image_put ( &cmdline_image );
>> > +
>> > + return 0;
>> > +
>> > + err_register_image:
>> > + image_put ( &cmdline_image );
>> > + err_alloc_cmdline_copy:
>> > + return rc;
>> > +}
>> > +
>> > +/**
>> > + * Initialise command line
>> > + *
>> > + */
>> > +static void runtime_init ( void ) {
>> > + int rc;
>> > +
>> > + /* Initialise command line */
>> > + if ( ( rc = cmdline_init() ) != 0 ) {
>> > + /* No way to report failure */
>> > + return;
>> > + }
>> > +}
>> > +
>> > +/** Command line initialisation function */
>> > +struct startup_fn efi_runtime_startup_fn __startup_fn ( STARTUP_NORMAL
>> > ) = {
>> > + .startup = runtime_init,
>> > +};
>> > --
>> > 2.0.5
>>
>> Any reason why this patch was ignored? Maybe it can be done with less
>> code duplication but the idea seems legit. It's clearly a gap in EFI
>> functionality as compared to BIOS.
>>
>> Thanks,
>> Ladi
More information about the ipxe-devel
mailing list