Hi, This is V4 of the patchset. Previous versions were posted here. V1: https://lkml.org/lkml/2013/11/20/540 V2: https://lkml.org/lkml/2014/1/27/331 V3: https://lkml.org/lkml/2014/6/3/432 Changes since v3: - Took care of most of the review comments from V3. - Stopped building purgatory for 32bit. - If 64bit EFI is not enabled (EFI_64BIT) return error in kernel loading. - If EFI OLD_MEMMAP is being used, do not do EFI setup and user space is expected to pass acpi_rsdp=<addr> param and boot second kernel in non efi mode. - move machine_kexec.c code into kexec-bzimage64.c - Renamed kexec-bzimage.c to kexec-bzimage64.c to reflect the fact that it is only 64bit bzimage loader. This patch series is generated on top of 3.16.0-rc2. This patch series does not do kernel signature verification yet. I plan to post another patch series for that. Now distributions are already signing PE/COFF bzImage with PKCS7 signature I plan to parse and verify those signatures. Primary goal of this patchset is to prepare groundwork so that kernel image can be signed and signatures be verified during kexec load. This should help with two things. - It should allow kexec/kdump on secureboot enabled machines. - In general it can help even without secureboot. By being able to verify kernel image signature in kexec, it should help with avoiding module signing restrictions. Matthew Garret showed how to boot into a custom kernel, modify first kernel's memory and then jump back to old kernel and bypass any policy one wants to. I hope these patches can be queued up for 3.17. Even without signature verification support, they provide new syscall functionality. But I wil leave it to maintainers to decide if they want signature verification support also be ready to merge before they merge this patchset. Any feedback is welcome. Thanks Vivek Vivek Goyal (15): bin2c: Move bin2c in scripts/basic kernel: Build bin2c based on config option CONFIG_BUILD_BIN2C kexec: rename unusebale_pages to unusable_pages kexec: Move segment verification code in a separate function kexec: Use common function for kimage_normal_alloc() and kimage_crash_alloc() resource: Provide new functions to walk through resources kexec: Make kexec_segment user buffer pointer a union kexec: New syscall kexec_file_load() declaration kexec: Implementation of new syscall kexec_file_load purgatory/sha256: Provide implementation of sha256 in purgaotory context purgatory: Core purgatory functionality kexec: Load and Relocate purgatory at kernel load time kexec-bzImage64: Support for loading bzImage using 64bit entry kexec: Support for kexec on panic using new system call kexec: Support kexec/kdump on EFI systems arch/x86/Kbuild | 4 + arch/x86/Kconfig | 3 + arch/x86/Makefile | 8 + arch/x86/include/asm/crash.h | 9 + arch/x86/include/asm/kexec-bzimage64.h | 6 + arch/x86/include/asm/kexec.h | 40 + arch/x86/kernel/Makefile | 1 + arch/x86/kernel/crash.c | 563 ++++++++++++++ arch/x86/kernel/kexec-bzimage64.c | 532 +++++++++++++ arch/x86/kernel/machine_kexec_64.c | 228 ++++++ arch/x86/purgatory/Makefile | 30 + arch/x86/purgatory/entry64.S | 101 +++ arch/x86/purgatory/purgatory.c | 72 ++ arch/x86/purgatory/setup-x86_64.S | 58 ++ arch/x86/purgatory/sha256.c | 283 +++++++ arch/x86/purgatory/sha256.h | 22 + arch/x86/purgatory/stack.S | 19 + arch/x86/purgatory/string.c | 13 + arch/x86/syscalls/syscall_64.tbl | 1 + drivers/firmware/efi/runtime-map.c | 21 + include/linux/efi.h | 19 + include/linux/ioport.h | 6 + include/linux/kexec.h | 101 ++- include/linux/syscalls.h | 4 + include/uapi/linux/kexec.h | 11 + init/Kconfig | 5 + kernel/Makefile | 2 +- kernel/kexec.c | 1322 ++++++++++++++++++++++++++++---- kernel/resource.c | 101 ++- kernel/sys_ni.c | 1 + scripts/.gitignore | 1 - scripts/Makefile | 1 - scripts/basic/.gitignore | 1 + scripts/basic/Makefile | 1 + scripts/basic/bin2c.c | 35 + scripts/bin2c.c | 36 - 36 files changed, 3463 insertions(+), 198 deletions(-) create mode 100644 arch/x86/include/asm/crash.h create mode 100644 arch/x86/include/asm/kexec-bzimage64.h create mode 100644 arch/x86/kernel/kexec-bzimage64.c create mode 100644 arch/x86/purgatory/Makefile create mode 100644 arch/x86/purgatory/entry64.S create mode 100644 arch/x86/purgatory/purgatory.c create mode 100644 arch/x86/purgatory/setup-x86_64.S create mode 100644 arch/x86/purgatory/sha256.c create mode 100644 arch/x86/purgatory/sha256.h create mode 100644 arch/x86/purgatory/stack.S create mode 100644 arch/x86/purgatory/string.c create mode 100644 scripts/basic/bin2c.c delete mode 100644 scripts/bin2c.c -- 1.9.0
