[PATCH] arm64: efi: Fix stub cache maintenance
mark.rutland at arm.com
Wed Nov 12 08:39:11 PST 2014
While efi-entry.S mentions that efi_entry() will have relocated the
kernel image, it actually means that efi_entry will have placed a copy
of the kernel in the appropriate location, and until this is branched to
at the end of efi_entry.S, all instructions are executed from the
Thus while the flush in efi_entry.S does ensure that the copy is visible
to noncacheable accesses, it does not guarantee that this is true for
the image instructions are being executed from. This could have
disasterous effects when the MMU and caches are disabled if the image
has not been naturally evicted to the PoC.
Additionally, due to a missing dsb following the ic ialluis, the new
kernel image is not necessarily clean in the I-cache when it is branched
to, with similar potentially disasterous effects.
This patch adds additional flushing to ensure that the currently
executing stub text is flushed to the PoC and is thus visible to
noncacheable accesses. As it is placed after the instructions cache
maintenance for the new image and __flush_dcache_area already contains a
dsb, we do not need to add a separate barrier to ensure completion of
the icache maintenance.
Comments are updated to clarify the situation with regard to the two
images and the maintenance required for both.
Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Ian Campbell <ijc at hellion.org.uk>
Cc: Joel Schopp <joel.schopp at amd.com>
Cc: Leif Lindholm <leif.lindholm at linaro.org>
Cc: Mark Salter <msalter at redhat.com>
Cc: Roy Franz <roy.franz at linaro.org>
Cc: Will Deacon <will.deacon at arm.com>
arch/arm64/kernel/efi-entry.S | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/kernel/efi-entry.S b/arch/arm64/kernel/efi-entry.S
index 619b1dd..d18a449 100644
@@ -54,18 +54,17 @@ ENTRY(efi_stub_entry)
- * efi_entry() will have relocated the kernel image if necessary
- * and we return here with device tree address in x0 and the kernel
- * entry point stored at *image_addr. Save those values in registers
- * which are callee preserved.
+ * efi_entry() will have copied the kernel image if necessary and we
+ * return here with device tree address in x0 and the kernel entry
+ * point stored at *image_addr. Save those values in registers which
+ * are callee preserved.
mov x20, x0 // DTB address
ldr x0, [sp, #16] // relocated _text address
mov x21, x0
- * Flush dcache covering current runtime addresses
- * of kernel text/data. Then flush all of icache.
+ * Calculate size of the kernel Image (same for original and copy).
adrp x1, _text
add x1, x1, #:lo12:_text
@@ -73,9 +72,24 @@ ENTRY(efi_stub_entry)
add x2, x2, #:lo12:_edata
sub x1, x2, x1
+ * Flush the copied Image to the PoC, and ensure it is not shadowed by
+ * stale icache entries from before relocation.
+ * Ensure that the rest of this function (in the original Image) is
+ * visible when the caches are disabled. The I-cache can't have stale
+ * entries for the VA range of the current image, so no maintenance is
+ * necessary.
+ adr x0, efi_stub_entry
+ adr x1, efi_stub_entry_end
+ sub x1, x1, x0
+ bl __flush_dcache_area
/* Turn off Dcache and MMU */
mrs x0, CurrentEL
cmp x0, #CurrentEL_EL2
@@ -105,4 +119,5 @@ efi_load_fail:
ldp x29, x30, [sp], #32
More information about the linux-arm-kernel