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Date: Tue, 7 Jul 2015 16:21:43 -0700 From: Kees Cook <keescook@...omium.org> To: Yinghai Lu <yinghai@...nel.org> Cc: "H. Peter Anvin" <hpa@...or.com>, Baoquan He <bhe@...hat.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 00/42] x86: updated patches for kaslr and setup_data etc for v4.3 On Tue, Jul 7, 2015 at 1:19 PM, Yinghai Lu <yinghai@...nel.org> wrote: > Those patches are rebased on v4.2-rc1 that I sent before but were rejected > by Ingo on changelog. > > Kees Cook said that he would like to give a try to make improvement on changelog > to get things moving. Thanks for working on this! I think it might be best to split this long series into shorter ones. It seems like there are several areas: - fixing kASLR - extended kASLR above 4G - setup_data cleanup - various other cleanups It might make sense to keep them separate for easier review? -Kees > > First part are kaslr related: > 1. First put compressed kernel ZO near end of the buffer before decompressing > so we can find the ZO position easily for kaslr buffer searchin > 2. kill run_size calculation shell scripts. > 3. create new ident mapping for kasl 64bit, so we can cover > above 4G random kernel base > 4. 7 patches from He that support random random, as I already used his patches > to test the ident mapping code. > 5. some debug patches for boot/kaslr. > > Second part are setup_data related: > Now setup_data is reserved via memblock and e820 and different > handlers have different ways, and it is confusing. > 1. SETUP_E820_EXT: is consumed early and will not copy or access again. > have memory wasted. > 2. SETUP_EFI: is accessed via ioremap every time at early stage. > have memory wasted. > 3. SETUP_DTB: is copied locally. > have memory wasted. > 4. SETUP_PCI: is accessed via ioremap for every pci devices, even run-time. > Also setup_data is exported to debugfs for debug purpose. > Here will convert to let every handler to decide how to handle it. > and will not reserve the setup_data generally, so will not > waste memory and also make memblock/e820 keep page aligned. > 1. not touch E820 anymore. > 2. copy SETUP_EFI to __initdata variable and access it without ioremap. > 3. SETUP_DTB: reserver and copy to local and free. > 4. SETUP_PCI: reverve localy and convert to list, to avoid keeping ioremap. > 5. export SETUP_PCI via sysfs. > > Third part are some small cleanup patches. > > put those patches at > git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git for-x86-v4.3-next > > Thanks > > Yinghai > > > Baoquan He (7): > x86, kaslr: Fix a bug that relocation can not be handled when kernel is loaded above 2G > x86, kaslr: Introduce struct slot_area to manage randomization slot info > x86, kaslr: Add two functions which will be used later > x86, kaslr: Introduce fetch_random_virt_offset to randomize the kernel text mapping address > x86, kaslr: Randomize physical and virtual address of kernel separately > x86, kaslr: Add support of kernel physical address randomization above 4G > x86, kaslr: Remove useless codes > > Yinghai Lu (35): > x86, kasl: Remove not needed parameter for choose_kernel_location > x86, boot: Move compressed kernel to end of buffer before decompressing > x86, boot: Fix run_size calculation > x86, kaslr: Kill not needed and wrong run_size calculation code. > x86, kaslr: rename output_size to output_run_size > x86, kaslr: Consolidate mem_avoid array filling > x86, boot: Move z_extract_offset calculation to header.S > x86, kaslr: Get correct max_addr for relocs pointer > x86, boot: Split kernel_ident_mapping_init to another file > x86, 64bit: Set ident_mapping for kaslr > x86, boot: Add checking for memcpy > x86, kaslr: Allow random address could be below loaded address > x86, boot: Add printf support for early console in compressed/misc.c > x86, boot: Add more debug printout in compressed/misc.c > x86, setup: Check early serial console per string instead of one char > x86, setup: Use puts() instead of printf() in edd code > x86: Setup early console as early as possible in x86_start_kernel() > x86, boot: print compression suffix in decompress stage > x86: remove not needed clear_page calling > x86: restore end_of_ram to E820_RAM > x86, boot: Allow 64bit EFI kernel to be loaded above 4G > x86: Find correct 64 bit ramdisk address for microcode early update > x86: Kill E820_RESERVED_KERN > x86, efi: Copy SETUP_EFI data and access directly > x86, of: Let add_dtb reserve setup_data locally > x86, boot: Add add_pci handler for SETUP_PCI > x86: Kill not used setup_data handling code > x86, boot, PCI: Convert SETUP_PCI data to list > x86, boot, PCI: Copy SETUP_PCI rom to kernel space > x86, boot, PCI: Export SETUP_PCI data via sysfs > x86: Fix typo in mark_rodata_ro > x86, 64bit: add pfn_range_is_highmapped() > x86, 64bit: remove highmap for not needed ranges > x86, 64bit: Add __pa_high/__va_high > x86: fix msr print again > > Documentation/x86/boot.txt | 19 ++ > arch/x86/boot/Makefile | 13 +- > arch/x86/boot/compressed/Makefile | 21 +- > arch/x86/boot/compressed/aslr.c | 258 ++++++++++++++++------- > arch/x86/boot/compressed/eboot.c | 15 +- > arch/x86/boot/compressed/head_32.S | 14 +- > arch/x86/boot/compressed/head_64.S | 22 +- > arch/x86/boot/compressed/misc.c | 129 +++++++++--- > arch/x86/boot/compressed/misc.h | 41 +++- > arch/x86/boot/compressed/misc_pgt.c | 91 ++++++++ > arch/x86/boot/compressed/mkpiggy.c | 28 +-- > arch/x86/boot/compressed/printf.c | 5 + > arch/x86/boot/compressed/string.c | 28 ++- > arch/x86/boot/compressed/vmlinux.lds.S | 1 + > arch/x86/boot/edd.c | 4 +- > arch/x86/boot/header.S | 34 ++- > arch/x86/boot/tty.c | 14 +- > arch/x86/include/asm/boot.h | 19 ++ > arch/x86/include/asm/efi.h | 2 +- > arch/x86/include/asm/page.h | 5 + > arch/x86/include/asm/pci.h | 4 + > arch/x86/include/asm/pgtable_64.h | 2 + > arch/x86/include/asm/processor.h | 1 - > arch/x86/include/asm/prom.h | 9 +- > arch/x86/include/asm/setup.h | 5 + > arch/x86/include/uapi/asm/bootparam.h | 1 + > arch/x86/include/uapi/asm/e820.h | 8 - > arch/x86/kernel/asm-offsets.c | 2 + > arch/x86/kernel/cpu/common.c | 61 +++--- > arch/x86/kernel/cpu/microcode/amd_early.c | 10 +- > arch/x86/kernel/cpu/microcode/intel_early.c | 8 +- > arch/x86/kernel/devicetree.c | 39 ++-- > arch/x86/kernel/e820.c | 18 +- > arch/x86/kernel/head.c | 26 +++ > arch/x86/kernel/head32.c | 1 + > arch/x86/kernel/head64.c | 21 +- > arch/x86/kernel/kdebugfs.c | 142 ------------- > arch/x86/kernel/setup.c | 79 ++----- > arch/x86/kernel/tboot.c | 3 +- > arch/x86/kernel/vmlinux.lds.S | 1 + > arch/x86/mm/ident_map.c | 74 +++++++ > arch/x86/mm/init_64.c | 173 +++++++-------- > arch/x86/mm/pageattr.c | 16 +- > arch/x86/pci/common.c | 313 ++++++++++++++++++++++++++-- > arch/x86/platform/efi/efi.c | 13 +- > arch/x86/platform/efi/efi_64.c | 10 +- > arch/x86/platform/efi/quirks.c | 23 +- > arch/x86/tools/calc_run_size.sh | 42 ---- > drivers/tty/serial/8250/8250_early.c | 17 ++ > kernel/printk/printk.c | 11 +- > 50 files changed, 1235 insertions(+), 661 deletions(-) > create mode 100644 arch/x86/boot/compressed/misc_pgt.c > create mode 100644 arch/x86/boot/compressed/printf.c > create mode 100644 arch/x86/mm/ident_map.c > delete mode 100644 arch/x86/tools/calc_run_size.sh > > -- > 1.8.4.5 > -- Kees Cook Chrome OS Security -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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