6.4 libtasn1

libtasn1 is a library providing Abstract Syntax Notation One (ASN.1, as specified by the X.680 ITU-T recommendation) parsing and structures management, and Distinguished Encoding Rules (DER, as per X.690) encoding and decoding functions.

To upgrade to a new version of the libtasn1 library, download the release tarball and copy the files into the target directory:

curl -L -O https://ftp.gnu.org/gnu/libtasn1/libtasn1-4.19.0.tar.gz
tar xvzf libtasn1-4.19.0.tar.gz
rm -rf grub-core/lib/libtasn1
mkdir -p grub-core/lib/libtasn1/lib
mkdir -p grub-core/lib/libtasn1/tests
cp libtasn1-4.19.0/{README.md,COPYING} grub-core/lib/libtasn1
cp libtasn1-4.19.0/lib/{coding.c,decoding.c,element.c,element.h,errors.c,gstr.c,gstr.h,int.h,parser_aux.c,parser_aux.h,structure.c,structure.h} grub-core/lib/libtasn1/lib
cp libtasn1-4.19.0/lib/includes/libtasn1.h grub-core/lib/libtasn1
cp libtasn1-4.19.0/tests/{CVE-2018-1000654-1_asn1_tab.h,CVE-2018-1000654-2_asn1_tab.h,CVE-2018-1000654.c,object-id-decoding.c,object-id-encoding.c,octet-string.c,reproducers.c,Test_overflow.c,Test_simple.c,Test_strings.c} grub-core/lib/libtasn1/tests
rm -rf libtasn1-4.19.0*

After upgrading the library, it may be necessary to apply the patches in grub-core/lib/libtasn1-patches/ to adjust the code to be compatible with GRUB. These patches were needed to use the current version of libtasn1. The existing patches may not apply cleanly, apply at all, or even be needed for a newer version of the library, and other patches may be needed due to changes in the newer version. If existing patches need to be refreshed to apply cleanly, please include updated patches as part of the a patch set sent to the list. If new patches are needed or existing patches are not needed, also please send additions or removals as part of any patch set upgrading libtasn1.