Commit 4a23e56a authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Will Deacon
Browse files

arm64: kaslr: ignore modulo offset when validating virtual displacement 



In the KASLR setup routine, we ensure that the early virtual mapping
of the kernel image does not cover more than a single table entry at
the level above the swapper block level, so that the assembler routines
involved in setting up this mapping can remain simple.

In this calculation we add the proposed KASLR offset to the values of
the _text and _end markers, and reject it if they would end up falling
in different swapper table sized windows.

However, when taking the addresses of _text and _end, the modulo offset
(the physical displacement modulo 2 MB) is already accounted for, and
so adding it again results in incorrect results. So disregard the modulo
offset from the calculation.

Fixes: 08cdac61 ("arm64: relocatable: deal with physically misaligned ...")
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Tested-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 289d07a2

arch/arm64/kernel/head.S

+0 −1
Original line number Diff line number Diff line
@@ -354,7 +354,6 @@ __primary_switched: 
	tst	x23, ~(MIN_KIMG_ALIGN - 1)	// already running randomized?

	b.ne	0f

	mov	x0, x21				// pass FDT address in x0

	mov	x1, x23				// pass modulo offset in x1

	bl	kaslr_early_init		// parse FDT for KASLR options

	cbz	x0, 0f				// KASLR disabled? just proceed

	orr	x23, x23, x0			// record KASLR offset

arch/arm64/kernel/kaslr.c

+9 −3
Original line number Diff line number Diff line
@@ -75,7 +75,7 @@ extern void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, 
 * containing function pointers) to be reinitialized, and zero-initialized

 * .bss variables will be reset to 0.

 */

u64 __init kaslr_early_init(u64 dt_phys, u64 modulo_offset)

u64 __init kaslr_early_init(u64 dt_phys)

{

	void *fdt;

	u64 seed, offset, mask, module_range;
@@ -133,9 +133,15 @@ u64 __init kaslr_early_init(u64 dt_phys, u64 modulo_offset) 
	 * boundary (for 4KB/16KB/64KB granule kernels, respectively). If this

	 * happens, increase the KASLR offset by the size of the kernel image

	 * rounded up by SWAPPER_BLOCK_SIZE.

	 *

	 * NOTE: The references to _text and _end below will already take the

	 *       modulo offset (the physical displacement modulo 2 MB) into

	 *       account, given that the physical placement is controlled by

	 *       the loader, and will not change as a result of the virtual

	 *       mapping we choose.

	 */

	if ((((u64)_text + offset + modulo_offset) >> SWAPPER_TABLE_SHIFT) !=

	    (((u64)_end + offset + modulo_offset) >> SWAPPER_TABLE_SHIFT)) {

	if ((((u64)_text + offset) >> SWAPPER_TABLE_SHIFT) !=

	    (((u64)_end + offset) >> SWAPPER_TABLE_SHIFT)) {

		u64 kimg_sz = _end - _text;

		offset = (offset + round_up(kimg_sz, SWAPPER_BLOCK_SIZE))

				& mask;

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