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authorRoy Franz <roy.franz@hpe.com>2016-11-12 21:32:29 +0000
committerIngo Molnar <mingo@kernel.org>2016-11-13 08:23:14 +0100
commit5b88a31c222c47cb8997021cc8a576927ba0e77f (patch)
tree10c1f005a2b21c1c8a1c767294afd704da0554c4
parent74239ac259519a98f4c32439326afe7e7eb64459 (diff)
efi/libstub: Fix allocation size calculations
Adjust the size used in calculations to match the actual size of allocation that will be performed based on EFI size/alignment constraints. efi_high_alloc() and efi_low_alloc() use the passed size in bytes directly to find space in the memory map for the allocation, rather than the actual allocation size that has been adjusted for size and alignment constraints. This results in failed allocations and retries in efi_high_alloc(). The same error is present in efi_low_alloc(), although failure will only happen if the lowest memory block is small. Also use EFI_PAGE_SIZE consistently and remove use of EFI_PAGE_SHIFT to calculate page size. Signed-off-by: Roy Franz <roy.franz@hpe.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt 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/20161112213237.8804-2-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--drivers/firmware/efi/libstub/efi-stub-helper.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index aded10662020..4b74bf86c74d 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -186,14 +186,16 @@ efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
goto fail;
/*
- * Enforce minimum alignment that EFI requires when requesting
- * a specific address. We are doing page-based allocations,
- * so we must be aligned to a page.
+ * Enforce minimum alignment that EFI or Linux requires when
+ * requesting a specific address. We are doing page-based (or
+ * larger) allocations, and both the address and size must meet
+ * alignment constraints.
*/
if (align < EFI_ALLOC_ALIGN)
align = EFI_ALLOC_ALIGN;
- nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
+ size = round_up(size, EFI_ALLOC_ALIGN);
+ nr_pages = size / EFI_PAGE_SIZE;
again:
for (i = 0; i < map_size / desc_size; i++) {
efi_memory_desc_t *desc;
@@ -208,7 +210,7 @@ again:
continue;
start = desc->phys_addr;
- end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
+ end = start + desc->num_pages * EFI_PAGE_SIZE;
if (end > max)
end = max;
@@ -278,14 +280,16 @@ efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
goto fail;
/*
- * Enforce minimum alignment that EFI requires when requesting
- * a specific address. We are doing page-based allocations,
- * so we must be aligned to a page.
+ * Enforce minimum alignment that EFI or Linux requires when
+ * requesting a specific address. We are doing page-based (or
+ * larger) allocations, and both the address and size must meet
+ * alignment constraints.
*/
if (align < EFI_ALLOC_ALIGN)
align = EFI_ALLOC_ALIGN;
- nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
+ size = round_up(size, EFI_ALLOC_ALIGN);
+ nr_pages = size / EFI_PAGE_SIZE;
for (i = 0; i < map_size / desc_size; i++) {
efi_memory_desc_t *desc;
unsigned long m = (unsigned long)map;
@@ -300,7 +304,7 @@ efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
continue;
start = desc->phys_addr;
- end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
+ end = start + desc->num_pages * EFI_PAGE_SIZE;
/*
* Don't allocate at 0x0. It will confuse code that