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packages: apply usign padding workarounds to package indexes if needed

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Since usign miscalculates SHA-512 digests for input sizes of exactly
64 + N * 128 + 110 or 64 + N * 128 + 111 bytes, we need to apply some
white space padding to avoid triggering the hashing edge case.

While usign itself has been fixed already, there is still many firmwares
in the wild which use broken usign versions to verify current package
indexes so we'll need to carry this workaround in the forseeable future.

Ref: https://forum.openwrt.org/t/signature-check-failed/41945
Ref: https://git.openwrt.org/5a52b379902471cef495687547c7b568142f66d2
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich 2019-08-07 07:15:07 +02:00
parent f565f276e2
commit e1f588e446
1 changed files with 6 additions and 2 deletions
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6
package/Makefile
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@ -84,7 +84,11 @@ $(curdir)/index: FORCE
mkdir -p $$d; \
cd $$d || continue; \
$(SCRIPT_DIR)/ipkg-make-index.sh . 2>&1 > Packages.manifest; \
grep -vE '^(Maintainer|LicenseFiles|Source|SourceName|Require)' Packages.manifest > Packages && \
grep -vE '^(Maintainer|LicenseFiles|Source|SourceName|Require)' Packages.manifest > Packages; \
case "$$(((64 + $$(stat -L -c%s Packages)) % 128))" in 110|111) \
$(call ERROR_MESSAGE,WARNING: Applying padding in $$d/Packages to workaround usign SHA-512 bug!); \
{ echo ""; echo ""; } >> Packages;; \
esac; \
gzip -9nc Packages > Packages.gz; \
); done
ifdef CONFIG_SIGNED_PACKAGES