From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5sub3 0/4] arm64: KASLR: EFI stub part
Date: Wed, 10 Feb 2016 18:55:01 +0100 [thread overview]
Message-ID: <1455126905-22688-1-git-send-email-ard.biesheuvel@linaro.org> (raw)
This subseries contains the EFI stub specific changes of my KASLR series
for arm64. The original v4 series can be found here:
http://thread.gmane.org/gmane.linux.kernel/2135931
This series consists of the patches that result in the kernel to be allocated
at a random physical offset on UEFI systems that implement the EFI_RNG_PROTOCOL
protocol (if so configured), and pass a random value in /chosen/kaslr-seed in
the device tree, to be used by the kernel proper to randomize the layout of
the kernel virtual address space.
Changes since v4:
- added R-b's from Matt and Kees (#2
- removed a redundant efi_status_t initializer (#2)
- fixed an issue in update_fdt() (#4) where 'int status' was mistaken for a
efi_status_t
Patch #1 implements efi_get_random_bytes() based on the EFI_RNG_PROTOCOL
Patch #2 implements efi_random_alloc()
Patch #3 moves the allocation for the converted command line (UTF-16 to ASCII)
away from the base of memory. This is necessary since for parsing the command
line before allocating the kernel image.
Patch #4 implements the actual KASLR, by randomizing the kernel physical
address, and passing entropy in /chosen/kaslr-seed so that the kernel proper can
relocate itself virtually.
Ard Biesheuvel (4):
efi: stub: implement efi_get_random_bytes() based on EFI_RNG_PROTOCOL
efi: stub: add implementation of efi_random_alloc()
efi: stub: use high allocation for converted command line
arm64: efi: invoke EFI_RNG_PROTOCOL to supply KASLR randomness
arch/arm64/Kconfig | 5 +
arch/x86/include/asm/efi.h | 2 +
drivers/firmware/efi/libstub/Makefile | 2 +-
drivers/firmware/efi/libstub/arm-stub.c | 40 ++++--
drivers/firmware/efi/libstub/arm64-stub.c | 78 +++++++----
drivers/firmware/efi/libstub/efi-stub-helper.c | 7 +-
drivers/firmware/efi/libstub/efistub.h | 7 +
drivers/firmware/efi/libstub/fdt.c | 14 ++
drivers/firmware/efi/libstub/random.c | 135 ++++++++++++++++++++
include/linux/efi.h | 5 +-
10 files changed, 257 insertions(+), 38 deletions(-)
create mode 100644 drivers/firmware/efi/libstub/random.c
--
2.5.0
next reply other threads:[~2016-02-10 17:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-10 17:55 Ard Biesheuvel [this message]
2016-02-10 17:55 ` [PATCH v5sub3 1/4] efi: stub: implement efi_get_random_bytes() based on EFI_RNG_PROTOCOL Ard Biesheuvel
2016-02-10 17:55 ` [PATCH v5sub3 2/4] efi: stub: add implementation of efi_random_alloc() Ard Biesheuvel
2016-02-10 17:55 ` [PATCH v5sub3 3/4] efi: stub: use high allocation for converted command line Ard Biesheuvel
2016-02-10 17:55 ` [PATCH v5sub3 4/4] arm64: efi: invoke EFI_RNG_PROTOCOL to supply KASLR randomness Ard Biesheuvel
2016-02-18 10:15 ` Matt Fleming
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