From: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
To give some leeway to code that handles non-standard capsule headers,
let's keep an array of page addresses rather than struct page pointers.
This gives special implementations of efi_capsule_setup_info() the
opportunity to mangle the payload a bit before it is presented to the
firmware, without putting any knowledge of the nature of such quirks
into the generic code.
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
drivers/firmware/efi/capsule-loader.c | 12 ++++++++----
drivers/firmware/efi/capsule.c | 7 ++++---
include/linux/efi.h | 4 ++--
3 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/firmware/efi/capsule-loader.c b/drivers/firmware/efi/capsule-loader.c
index f7fdeab0bc37..feeafb673c07 100644
--- a/drivers/firmware/efi/capsule-loader.c
+++ b/drivers/firmware/efi/capsule-loader.c
@@ -20,6 +20,10 @@
#define NO_FURTHER_WRITE_ACTION -1
+#ifndef phys_to_page
+#define phys_to_page(x) pfn_to_page((x) >> PAGE_SHIFT)
+#endif
+
/**
* efi_free_all_buff_pages - free all previous allocated buffer pages
* @cap_info: pointer to current instance of capsule_info structure
@@ -31,7 +35,7 @@
static void efi_free_all_buff_pages(struct capsule_info *cap_info)
{
while (cap_info->index > 0)
- __free_page(cap_info->pages[--cap_info->index]);
+ __free_page(phys_to_page(cap_info->pages[--cap_info->index]));
cap_info->index = NO_FURTHER_WRITE_ACTION;
}
@@ -161,12 +165,12 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
goto failed;
}
- cap_info->pages[cap_info->index++] = page;
+ cap_info->pages[cap_info->index++] = page_to_phys(page);
cap_info->page_bytes_remain = PAGE_SIZE;
+ } else {
+ page = phys_to_page(cap_info->pages[cap_info->index - 1]);
}
- page = cap_info->pages[cap_info->index - 1];
-
kbuff = kmap(page);
if (!kbuff) {
ret = -ENOMEM;
diff --git a/drivers/firmware/efi/capsule.c b/drivers/firmware/efi/capsule.c
index 6eedff45e6d7..57f85256feb2 100644
--- a/drivers/firmware/efi/capsule.c
+++ b/drivers/firmware/efi/capsule.c
@@ -214,7 +214,7 @@ efi_capsule_update_locked(efi_capsule_header_t *capsule,
*
* Return 0 on success, a converted EFI status code on failure.
*/
-int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages)
+int efi_capsule_update(efi_capsule_header_t *capsule, phys_addr_t *pages)
{
u32 imagesize = capsule->imagesize;
efi_guid_t guid = capsule->guid;
@@ -253,10 +253,11 @@ int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages)
}
for (j = 0; j < SGLIST_PER_PAGE && count > 0; j++) {
- u64 sz = min_t(u64, imagesize, PAGE_SIZE);
+ u64 sz = min_t(u64, imagesize,
+ PAGE_SIZE - (u64)*pages % PAGE_SIZE);
sglist[j].length = sz;
- sglist[j].data = page_to_phys(*pages++);
+ sglist[j].data = *pages++;
imagesize -= sz;
count--;
diff --git a/include/linux/efi.h b/include/linux/efi.h
index af54be874dd0..2cec67cc18a3 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -143,7 +143,7 @@ struct capsule_info {
long index;
size_t count;
size_t total_size;
- struct page **pages;
+ phys_addr_t *pages;
size_t page_bytes_remain;
};
@@ -1415,7 +1415,7 @@ extern int efi_capsule_supported(efi_guid_t guid, u32 flags,
size_t size, int *reset);
extern int efi_capsule_update(efi_capsule_header_t *capsule,
- struct page **pages);
+ phys_addr_t *pages);
#ifdef CONFIG_EFI_RUNTIME_MAP
int efi_runtime_map_init(struct kobject *);
--
2.12.0
--
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