Hi Philipp, On 02/26/18 at 04:16pm, Philipp Rudo wrote: > > Hi everybody > > following the discussion with Dave and AKASHI, here are the common code > patches extracted from my recent patch set (Add kexec_file_load support to > s390) [1]. The patches were extracted to allow upstream integration together > with AKASHI's common code patches before the arch code gets adjusted to the > new base. > > The reason for this series is to prepare common code for adding > kexec_file_load to s390 as well as cleaning up the mis-use of the sh_offset > field during purgatory load. In detail this series contains: > > Patch #1&2: Minor cleanups/fixes. > > Patch #3-9: Clean up the purgatory load/relocation code. Especially remove > the mis-use of the purgatory_info->sechdrs->sh_offset field, currently > holding a pointer into either kexec_purgatory (ro) or purgatory_buf (rw) > depending on the section. With these patches the section address will be > calculated verbosely and sh_offset will contain the offset of the section > in the stripped purgatory binary (purgatory_buf). > > Patch #10: Allows architectures to set the purgatory load address. This > patch is important for s390 as the kernel and purgatory have to be loaded > to fixed addresses. In current code this is impossible as the purgatory > load is opaque to the architecture. > > Patch #11: Moves x86 purgatories sha implementation to common lib/ > directory to allow reuse in other architectures. > > The patches apply to v4.16-rc3. There are no changes compared to [1] (all > requested changes only affected s390 code). Please note that I had to touch > arch code for x86 and power a little. In theory this should not change the > behavior but I don't have a way to test it. Cross-compiling with > defconfig [2] works fine for both. > > Thanks > Philipp > > [1] http://lists.infradead.org/pipermail/kexec/2018-February/019926.html > [2] On x86 with the orc unwinder and stack validation turned off. objtool > SEGFAULTs on s390... > > Philipp Rudo (11): > kexec_file: Silence compile warnings > kexec_file: Remove checks in kexec_purgatory_load > kexec_file: Make purgatory_info->ehdr const > kexec_file: Search symbols in read-only kexec_purgatory > kexec_file: Use read-only sections in arch_kexec_apply_relocations* > kexec_file: Split up __kexec_load_puragory > kexec_file: Simplify kexec_purgatory_setup_sechdrs 1 > kexec_file: Simplify kexec_purgatory_setup_sechdrs 2 > kexec_file: Remove mis-use of sh_offset field > kexec_file: Allow archs to set purgatory load address > kexec_file: Move purgatories sha256 to common code > > arch/powerpc/kernel/kexec_elf_64.c | 9 +- > arch/x86/kernel/kexec-bzimage64.c | 8 +- > arch/x86/kernel/machine_kexec_64.c | 66 ++--- > arch/x86/purgatory/Makefile | 3 + > arch/x86/purgatory/purgatory.c | 2 +- > include/linux/kexec.h | 38 +-- > {arch/x86/purgatory => include/linux}/sha256.h | 10 +- > kernel/kexec_file.c | 375 ++++++++++++------------- > {arch/x86/purgatory => lib}/sha256.c | 4 +- > 9 files changed, 244 insertions(+), 271 deletions(-) > rename {arch/x86/purgatory => include/linux}/sha256.h (63%) > rename {arch/x86/purgatory => lib}/sha256.c (99%) > > -- > 2.13.5 > I did a test on x86, but it failed: [ 15.636489] kexec: Undefined symbol: memcpy [ 15.636496] kexec-bzImage64: Loading purgatory failed [ 33.603356] kexec: Undefined symbol: memcpy [ 33.603362] kexec-bzImage64: Loading purgatory failed I think this relates to the sha256 splitting patch. After reverting the sha256 patch (the last one), rebuilt a kernel but it still failed to load: # kexec -d -s -l /home/dyoung/git/linux-x86/sign/bzImage.signed Try gzip decompression. Try LZMA decompression. lzma_decompress_file: read on /home/dyoung/git/linux-x86/sign/bzImage.signed of 65536 bytes failed Thanks Dave -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
