[PATCH 1/1] cmd: bootefi: allocate device-tree copy from high memory
Heinrich Schuchardt
heinrich.schuchardt at canonical.com
Thu Feb 23 19:00:29 CET 2023
The bootefi command creates a copy of the device-tree within the first
127 MiB of memory. This may lead to overwriting previously loaded binaries
(e.g. kernel, initrd).
Linux EFI stub itself copies U-Boot's copy of the device-tree. This means
there is not restriction for U-Boot to place the device-tree copy to any
address. (Restrictions existed for 32bit ARM before Linux commit
7a1be318f579 ("ARM: 9012/1: move device tree mapping out of linear region")
for legacy booting.
Reported-by: Alexandre Ghiti <alexghiti at rivosinc.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
cmd/bootefi.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 6618335ddf..aca4e99930 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -208,21 +208,12 @@ static efi_status_t copy_fdt(void **fdtp)
* Safe fdt location is at 127 MiB.
* On the sandbox convert from the sandbox address space.
*/
- new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
- fdt_size, 0);
- ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
+ ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
&new_fdt_addr);
if (ret != EFI_SUCCESS) {
- /* If we can't put it there, put it somewhere */
- new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
- ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
- EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
- &new_fdt_addr);
- if (ret != EFI_SUCCESS) {
- log_err("ERROR: Failed to reserve space for FDT\n");
- goto done;
- }
+ log_err("ERROR: Failed to reserve space for FDT\n");
+ goto done;
}
new_fdt = (void *)(uintptr_t)new_fdt_addr;
memcpy(new_fdt, fdt, fdt_totalsize(fdt));
--
2.38.1
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