[PATCH v2 0/4] kexec/arm64: Add support for zlib compressed kernel images (Image.gz)

Bhupesh Sharma bhsharma at redhat.com
Sun Jul 14 23:02:52 PDT 2019

Changes since v1:
(v1 can be viewed here: http://lists.infradead.org/pipermail/kexec/2019-July/023288.html)
 - Fixed the potential file descriptor leakage code legs pointed out by
 - Ran Valgrind to make sure no potential memory leakage issues are
   introduced by this patchset.

This patchset adds the support for zlib compressed kernel images
(Image.gz) for arm64 kexec-tools.

This was discussed a bit with the arm64 kernel maintainers (see [0]) and
after discussing the pros and cons of adding this support in
kernel-space v/s in user-space, we decided it makes more sense to add
this support to the user-space kexec-tools.

Note that this series adds support for unsigned arm64 Image.gz files
only as signing an Image.gz type file is not a easy implementation from
kexec-tools p-o-v. Also even standard signing tools like sbsign fail to
recongize the Image.gz format:

 $ sbsign --key certs/signing_key.pem  --cert certs/signing_key.pem Image.gz
   Invalid DOS header magic

... because that gzip file isn't a PE32+ that can be loaded by UEFI.
So I will work on the same in coming days and try to send a RFC
patchset for the same later on.

[0]. http://lists.infradead.org/pipermail/kexec/2019-June/023156.html

Bhupesh Sharma (4):
  kexec/kexec.c: Add the missing close() for fd used for
  kexec-uImage-arm64.c: Fix return value of uImage_arm64_probe()
  kexec/kexec-zlib.h: Add 'is_zlib_file()' helper function
  kexec/arm64: Add support for handling zlib compressed (Image.gz) image

 kexec/arch/arm64/Makefile             |   3 +-
 kexec/arch/arm64/kexec-arm64.c        |   1 +
 kexec/arch/arm64/kexec-arm64.h        |   7 ++
 kexec/arch/arm64/kexec-image-arm64.c  |   4 +-
 kexec/arch/arm64/kexec-uImage-arm64.c |  13 +-
 kexec/arch/arm64/kexec-zImage-arm64.c | 226 ++++++++++++++++++++++++++++++++++
 kexec/kexec-zlib.h                    |   1 +
 kexec/kexec.c                         |  14 +++
 kexec/zlib.c                          |  38 ++++++
 9 files changed, 303 insertions(+), 4 deletions(-)
 create mode 100644 kexec/arch/arm64/kexec-zImage-arm64.c


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