[ipxe-devel] [PATCH] [efi] Allow iPXE's own command line to be executed as a script
Christian Nilsson
nikize at gmail.com
Thu May 18 09:47:48 UTC 2017
It needs some fixes before merge, but have not gotten around to it
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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ipxe.org/pipermail/ipxe-devel/attachments/20170518/da8efa6d/attachment.htm>
More information about the ipxe-devel
mailing list