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efi_loader: parameter checks BLOCK_IO_PROTOCOL

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Check parameters of ReadBlocks() and WriteBlocks().

If the buffer size is not a multiple of the block size, we have to return
EFI_BAD_BUFFER_SIZE.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-09-05 19:31:23 +02:00
parent 03446987c5
commit f59f0825e8
1 changed files with 36 additions and 1 deletions
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37
lib/efi_loader/efi_disk.c
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@ -74,7 +74,7 @@ static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
/* We only support full block access */
if (buffer_size & (blksz - 1))
return EFI_DEVICE_ERROR;
return EFI_BAD_BUFFER_SIZE;
if (direction == EFI_DISK_READ)
n = blk_dread(desc, lba, blocks, buffer);
@ -99,6 +99,20 @@ static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
void *real_buffer = buffer;
efi_status_t r;
if (!this)
return EFI_INVALID_PARAMETER;
/* TODO: check for media changes */
if (media_id != this->media->media_id)
return EFI_MEDIA_CHANGED;
if (!this->media->media_present)
return EFI_NO_MEDIA;
/* media->io_align is a power of 2 */
if ((uintptr_t)buffer & (this->media->io_align - 1))
return EFI_INVALID_PARAMETER;
if (lba * this->media->block_size + buffer_size >
this->media->last_block * this->media->block_size)
return EFI_INVALID_PARAMETER;
#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
r = efi_disk_read_blocks(this, media_id, lba,
@ -134,6 +148,22 @@ static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
void *real_buffer = buffer;
efi_status_t r;
if (!this)
return EFI_INVALID_PARAMETER;
if (this->media->read_only)
return EFI_WRITE_PROTECTED;
/* TODO: check for media changes */
if (media_id != this->media->media_id)
return EFI_MEDIA_CHANGED;
if (!this->media->media_present)
return EFI_NO_MEDIA;
/* media->io_align is a power of 2 */
if ((uintptr_t)buffer & (this->media->io_align - 1))
return EFI_INVALID_PARAMETER;
if (lba * this->media->block_size + buffer_size >
this->media->last_block * this->media->block_size)
return EFI_INVALID_PARAMETER;
#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
r = efi_disk_write_blocks(this, media_id, lba,
@ -288,6 +318,11 @@ static efi_status_t efi_disk_add_dev(
/* Fill in EFI IO Media info (for read/write callbacks) */
diskobj->media.removable_media = desc->removable;
diskobj->media.media_present = 1;
/*
* MediaID is just an arbitrary counter.
* We have to change it if the medium is removed or changed.
*/
diskobj->media.media_id = 1;
diskobj->media.block_size = desc->blksz;
diskobj->media.io_align = desc->blksz;
diskobj->media.last_block = desc->lba - offset;