Commit 82c3768b authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Ingo Molnar

efi/capsule-loader: Use a cached copy of the capsule header

Instead of kmapping the capsule data twice, copy the capsule header
into the capsule info struct we keep locally. This is an improvement
by itself, but will also enable handling of non-standard header formats
more easily.
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170602135207.21708-7-ard.biesheuvel@linaro.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 41b0c376
......@@ -21,7 +21,7 @@
#define NO_FURTHER_WRITE_ACTION -1
struct capsule_info {
bool header_obtained;
efi_capsule_header_t header;
int reset_type;
long index;
size_t count;
......@@ -56,7 +56,6 @@ static void efi_free_all_buff_pages(struct capsule_info *cap_info)
static int efi_capsule_setup_info(struct capsule_info *cap_info,
void *kbuff, size_t hdr_bytes)
{
efi_capsule_header_t *cap_hdr;
size_t pages_needed;
int ret;
void *temp_page;
......@@ -66,8 +65,9 @@ static int efi_capsule_setup_info(struct capsule_info *cap_info,
return 0;
/* Reset back to the correct offset of header */
cap_hdr = kbuff - cap_info->count;
pages_needed = ALIGN(cap_hdr->imagesize, PAGE_SIZE) >> PAGE_SHIFT;
kbuff -= cap_info->count;
memcpy(&cap_info->header, kbuff, sizeof(cap_info->header));
pages_needed = ALIGN(cap_info->header.imagesize, PAGE_SIZE) / PAGE_SIZE;
if (pages_needed == 0) {
pr_err("invalid capsule size");
......@@ -75,15 +75,16 @@ static int efi_capsule_setup_info(struct capsule_info *cap_info,
}
/* Check if the capsule binary supported */
ret = efi_capsule_supported(cap_hdr->guid, cap_hdr->flags,
cap_hdr->imagesize,
ret = efi_capsule_supported(cap_info->header.guid,
cap_info->header.flags,
cap_info->header.imagesize,
&cap_info->reset_type);
if (ret) {
pr_err("capsule not supported\n");
return ret;
}
cap_info->total_size = cap_hdr->imagesize;
cap_info->total_size = cap_info->header.imagesize;
temp_page = krealloc(cap_info->pages,
pages_needed * sizeof(void *),
GFP_KERNEL | __GFP_ZERO);
......@@ -91,7 +92,6 @@ static int efi_capsule_setup_info(struct capsule_info *cap_info,
return -ENOMEM;
cap_info->pages = temp_page;
cap_info->header_obtained = true;
return 0;
}
......@@ -104,15 +104,8 @@ static int efi_capsule_setup_info(struct capsule_info *cap_info,
static ssize_t efi_capsule_submit_update(struct capsule_info *cap_info)
{
int ret;
void *cap_hdr_temp;
cap_hdr_temp = vmap(cap_info->pages, cap_info->index,
VM_MAP, PAGE_KERNEL);
if (!cap_hdr_temp)
return -ENOMEM;
ret = efi_capsule_update(cap_hdr_temp, cap_info->pages);
vunmap(cap_hdr_temp);
ret = efi_capsule_update(&cap_info->header, cap_info->pages);
if (ret) {
pr_err("capsule update failed\n");
return ret;
......@@ -192,7 +185,7 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
cap_info->page_bytes_remain -= write_byte;
/* Setup capsule binary info structure */
if (!cap_info->header_obtained) {
if (cap_info->header.headersize == 0) {
ret = efi_capsule_setup_info(cap_info, kbuff,
cap_info->count + write_byte);
if (ret)
......@@ -203,7 +196,7 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
kunmap(page);
/* Submit the full binary to efi_capsule_update() API */
if (cap_info->header_obtained &&
if (cap_info->header.headersize > 0 &&
cap_info->count >= cap_info->total_size) {
if (cap_info->count > cap_info->total_size) {
pr_err("capsule upload size exceeded header defined size\n");
......
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