[PATCH v4 4/8] efi_loader: support boot from URI device path
Maxim Uvarov
maxim.uvarov at linaro.org
Thu Sep 28 13:35:20 CEST 2023
On Tue, 26 Sept 2023 at 09:01, Masahisa Kojima <masahisa.kojima at linaro.org>
wrote:
> Hi Ilias,
>
> On Mon, 25 Sept 2023 at 21:37, Ilias Apalodimas
> <ilias.apalodimas at linaro.org> wrote:
> >
> > On Fri, Sep 22, 2023 at 04:11:15PM +0900, Masahisa Kojima wrote:
> > > This supports to boot from the URI device path.
> > > When user selects the URI device path, bootmgr downloads
> > > the file using wget into the address specified by loadaddr
> > > env variable.
> > > If the file is .iso or .img file, mount the image with blkmap
> > > then try to boot with the default file(e.g. EFI/BOOT/BOOTAA64.EFI).
> > > If the file is .efi file, load and start the downloaded file.
> > >
> > > Signed-off-by: Masahisa Kojima <masahisa.kojima at linaro.org>
> > > ---
> > > lib/efi_loader/efi_bootmgr.c | 189 +++++++++++++++++++++++++++++++++++
> > > 1 file changed, 189 insertions(+)
> > >
> > > diff --git a/lib/efi_loader/efi_bootmgr.c
> b/lib/efi_loader/efi_bootmgr.c
> > > index a40762c74c..605be5041e 100644
> > > --- a/lib/efi_loader/efi_bootmgr.c
> > > +++ b/lib/efi_loader/efi_bootmgr.c
> > > @@ -7,10 +7,14 @@
> > >
> > > #define LOG_CATEGORY LOGC_EFI
> > >
> > > +#include <blk.h>
> > > +#include <blkmap.h>
> > > #include <common.h>
> > > #include <charset.h>
> > > +#include <dm.h>
> > > #include <log.h>
> > > #include <malloc.h>
> > > +#include <net.h>
> > > #include <efi_default_filename.h>
> > > #include <efi_loader.h>
> > > #include <efi_variable.h>
> > > @@ -168,6 +172,182 @@ out:
> > > return ret;
> > > }
> > >
> > > +/**
> > > + * mount_image() - mount the image with blkmap
> > > + *
> > > + * @lo_label u16 label string of load option
> > > + * @image_addr: image address
> > > + * @image_size image size
> > > + * Return: pointer to the UCLASS_BLK udevice, NULL if failed
> > > + */
> > > +static struct udevice *mount_image(u16 *lo_label, ulong image_addr,
> int image_size)
> > > +{
> > > + int err;
> > > + struct blkmap *bm;
> > > + struct udevice *bm_dev;
> > > + char *label = NULL, *p;
> > > +
> > > + label = efi_alloc(utf16_utf8_strlen(lo_label) + 1);
> > > + if (!label)
> > > + return NULL;
> > > +
> > > + p = label;
> > > + utf16_utf8_strcpy(&p, lo_label);
> > > + err = blkmap_create_ramdisk(label, image_addr, image_size,
> &bm_dev);
> > > + if (err) {
> > > + efi_free_pool(label);
> > > + return NULL;
> > > + }
> > > + bm = dev_get_plat(bm_dev);
> > > +
> > > + efi_free_pool(label);
> > > +
> > > + return bm->blk;
> > > +}
> > > +
> > > +/**
> > > + * try_load_default_file() - try to load the default file
> > > + *
> > > + * Search the device having EFI_SIMPLE_FILE_SYSTEM_PROTOCOL,
> > > + * then try to load with the default boot file(e.g.
> EFI/BOOT/BOOTAA64.EFI).
> > > + *
> > > + * @dev pointer to the UCLASS_BLK or
> UCLASS_PARTITION udevice
> > > + * @image_handle: pointer to handle for newly installed image
> > > + * Return: status code
> > > + */
> > > +static efi_status_t try_load_default_file(struct udevice *dev,
> > > + efi_handle_t *image_handle)
> > > +{
> >
> > Maybe I misunderstood you on the previous series. Wasn't the plan to
> merge
> > the patch that adds boot options automatically when a disk is scanned?
> This
>
> Adding the boot option automatically when a disk is scanned was sent
> separately[1] from this series
> since this feature is the matter of the timing of automatic boot
> option creation and not directly related
> to EFI HTTP Boot.
> I also included the fixes of the efi_secboot python test failure.
> Sorry for confusing you.
>
> [1]
> https://patchwork.ozlabs.org/project/uboot/patch/20230920084121.1248590-1-masahisa.kojima@linaro.org/
>
> > code could only look for a boot option with '1234567' in its load options
> > instead of rescanning all devices with the EFI_SIMPLE_FILE_SYSTEM_PROTOCO
> > installed
>
> Now we can scan and load the default file(EFI/BOOT/BOOTAA64.EFI) on the
> fly with
> load_default_file_from_blk_dev() function.
> The patch #8 of this series "efi_loader: create BlockIo device boot
> option" create the boot option
> for the block device excluding the logical partition,
>
> >
> > > + efi_status_t ret;
> > > + efi_handle_t handle;
> > > + struct efi_handler *handler;
> > > + struct efi_device_path *file_path;
> > > + struct efi_device_path *device_path;
> > > +
> > > + if (dev_tag_get_ptr(dev, DM_TAG_EFI, (void **)&handle)) {
> > > + log_warning("DM_TAG_EFI not found\n");
> > > + return EFI_INVALID_PARAMETER;
> > > + }
> > > +
> > > + ret = efi_search_protocol(handle,
> > > + &efi_simple_file_system_protocol_guid,
> &handler);
> > > + if (ret != EFI_SUCCESS)
> > > + return ret;
> > > +
> > > + ret = EFI_CALL(bs->open_protocol(handle, &efi_guid_device_path,
> > > + (void **)&device_path,
> efi_root, NULL,
> > > +
> EFI_OPEN_PROTOCOL_GET_PROTOCOL));
> > > + if (ret != EFI_SUCCESS)
> > > + return ret;
> > > +
> > > + file_path = expand_media_path(device_path);
> > > + ret = EFI_CALL(efi_load_image(true, efi_root, file_path, NULL, 0,
> > > + image_handle));
> > > +
> > > + efi_free_pool(file_path);
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +/**
> > > + * load_default_file_from_blk_dev() - load the default file
> > > + *
> > > + * @blk pointer to the UCLASS_BLK udevice
> > > + * @handle: pointer to handle for newly installed image
> > > + * Return: status code
> > > + */
> > > +static efi_status_t load_default_file_from_blk_dev(struct udevice
> *blk,
> > > + efi_handle_t *handle)
> > > +{
> > > + efi_status_t ret;
> > > + struct udevice *partition;
> > > +
> > > + /* image that has no partition table but a file system */
> > > + ret = try_load_default_file(blk, handle);
> > > + if (ret == EFI_SUCCESS)
> > > + return ret;
> > > +
> > > + /* try the partitions */
> > > + device_foreach_child(partition, blk) {
> > > + enum uclass_id id;
> > > +
> > > + id = device_get_uclass_id(partition);
> > > + if (id != UCLASS_PARTITION)
> > > + continue;
> > > +
> > > + ret = try_load_default_file(partition, handle);
> > > + if (ret == EFI_SUCCESS)
> > > + return ret;
> > > + }
> > > +
> > > + return EFI_NOT_FOUND;
> > > +}
> > > +
> > > +/**
> > > + * try_load_from_uri_path() - Handle the URI device path
> > > + *
> > > + * @uridp: uri device path
> > > + * @lo_label label of load option
> > > + * @handle: pointer to handle for newly installed image
> > > + * Return: status code
> > > + */
> > > +static efi_status_t try_load_from_uri_path(struct efi_device_path_uri
> *uridp,
> > > + u16 *lo_label,
> > > + efi_handle_t *handle)
>
Maybe this comment is not related to this current commit, but on loading
http file we do not set maximum size to download. I.e. if the image will be
too big it will cause segfault I think.
> > > +{
> > > + char *s;
> > > + int uri_len;
> > > + int image_size;
> > > + efi_status_t ret;
> > > + ulong image_addr;
> > > +
> > > + s = env_get("loadaddr");
> > > + if (!s) {
> > > + log_err("Error: loadaddr is not set\n");
> > > + return EFI_INVALID_PARAMETER;
> > > + }
> > > + image_addr = hextoul(s, NULL);
> > > + image_size = wget_with_dns(image_addr, uridp->uri);
> > > + if (image_size < 0)
> > > + return EFI_INVALID_PARAMETER;
>
maybe something like env_get_hex("filesize", 0); here?
Size is potentially limited with half of int type here.
> > > +
> > > + /*
> > > + * If the file extension is ".iso" or ".img", mount it and try
> to load
> > > + * the default file.
> > > + * If the file is PE-COFF image, load the downloaded file.
> > > + */
> > > + uri_len = strlen(uridp->uri); /* todo: directly use uridp->uri */
> > > + if (!strncmp(&uridp->uri[uri_len - 4], ".iso", 4) ||
> > > + !strncmp(&uridp->uri[uri_len - 4], ".img", 4)) {
>
Is it possible to check magic numbers rather than naming?
I see that at least .iso has one:
https://en.wikipedia.org/wiki/List_of_file_signatures
> > > + struct udevice *blk;
> > > +
> > > + blk = mount_image(lo_label, image_addr, image_size);
> > > + if (!blk)
> > > + return EFI_INVALID_PARAMETER;
> > > +
> > > + ret = load_default_file_from_blk_dev(blk, handle);
> > > + } else if (efi_check_pe((void *)image_addr, image_size, NULL) ==
> EFI_SUCCESS) {
> > > + efi_handle_t mem_handle = NULL;
> > > + struct efi_device_path *file_path = NULL;
>
no need to set file_path to NULL
> > > +
> > > + file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
> > > + (uintptr_t)image_addr,
> image_size);
> > > + ret = efi_install_multiple_protocol_interfaces(
> > > + &mem_handle, &efi_guid_device_path, file_path,
> NULL);
> > > + if (ret != EFI_SUCCESS)
> > > + return EFI_INVALID_PARAMETER;
> > > +
> > > + ret = EFI_CALL(efi_load_image(false, efi_root, file_path,
> > > + (void *)image_addr,
> image_size,
> > > + handle));
> > > + } else {
> > > + log_err("Error: file type is not supported\n");
> > > + return EFI_INVALID_PARAMETER;
>
EFI_UNSUPPORTED or EFI_NO_MEDIA looks more suitable here.
> > > + }
> > > +
> > > + return ret;
> > > +}
> > > +
> > > /**
> > > * try_load_entry() - try to load image for boot option
> > > *
> > > @@ -211,6 +391,15 @@ static efi_status_t try_load_entry(u16 n,
> efi_handle_t *handle,
> > > if (EFI_DP_TYPE(lo.file_path, MEDIA_DEVICE, FILE_PATH)) {
> > > /* file_path doesn't contain a device path */
> > > ret = try_load_from_short_path(lo.file_path,
> handle);
> > > + } else if (EFI_DP_TYPE(lo.file_path, MESSAGING_DEVICE,
> MSG_URI)) {
> > > + if (IS_ENABLED(CONFIG_BLKMAP) &&
> > > + IS_ENABLED(CONFIG_CMD_WGET) &&
> > > + IS_ENABLED(CONFIG_CMD_DNS)) {
>
This looks like too many Kconfig options. Maybe there is a way to make some
function empty and let LTO do size optimization.
> > > + ret = try_load_from_uri_path(
> > > + (struct efi_device_path_uri *)
> > > + lo.file_path,
> > > + lo.label, handle);
> > > + }
> >
> > is ret initialized in this function? Otherwise we need to initialize it
> if
> > one of the Kconfig options are disabled
>
> Thank you, I will add an 'else' statement to set the error here.
>
> Thanks,
> Masahisa Kojima
>
> >
> > > } else {
> > > file_path = expand_media_path(lo.file_path);
> > > ret = EFI_CALL(efi_load_image(true, efi_root,
> file_path,
> > > --
> > > 2.34.1
> > >
> >
> > Thanks
> > /Ilias
>
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