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Enhance Dockerfile.optimized to include binutils for objcopy command and improve UPX compression strategy. Added steps to remove residual padding and compare compression results, ensuring the smallest binary size.

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Ly Tuan Kiet
2025-07-05 05:28:15 +00:00
parent 6fd3eac4b4
commit 0babcb18ff
1 changed files with 13 additions and 5 deletions
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18
brute/source/Dockerfile.optimized
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@@ -7,7 +7,8 @@ FROM alpine:latest AS build
# musl-dev: C library headers for static linking # musl-dev: C library headers for static linking
# linux-headers: Kernel headers for system calls # linux-headers: Kernel headers for system calls
# upx: Ultimate Packer for eXecutables - binary compression tool # upx: Ultimate Packer for eXecutables - binary compression tool
RUN apk add --no-cache build-base musl-dev linux-headers upx # binutils: For objcopy command
RUN apk add --no-cache build-base musl-dev linux-headers upx binutils
# Set working directory for all subsequent operations # Set working directory for all subsequent operations
WORKDIR /src WORKDIR /src
@@ -58,10 +59,17 @@ RUN gcc -static -Os -s \
--remove-section=.note.* \ --remove-section=.note.* \
--remove-section=.eh_frame \ --remove-section=.eh_frame \
bruteforce \ bruteforce \
# UPX compression with maximum settings: # === Remove residual padding BEFORE compression === \
# --lzma: Use LZMA compression algorithm (better ratio than default) && objcopy --pad-to=0 --gap-fill=0 bruteforce bruteforce.pad \
# --ultra-brute: Try all compression methods and use the best result && mv bruteforce.pad bruteforce \
&& upx --lzma --ultra-brute bruteforce # === UPX variant shoot-out: keep smaller of two compressions === \
&& cp bruteforce bruteforce.ultra && upx --ultra-brute bruteforce.ultra \
&& cp bruteforce bruteforce.lzma && upx --lzma --best --no-align bruteforce.lzma \
&& if [ $(stat -c%s bruteforce.ultra) -le $(stat -c%s bruteforce.lzma) ]; then \
mv bruteforce.ultra bruteforce; rm bruteforce.lzma; \
else \
mv bruteforce.lzma bruteforce; rm bruteforce.ultra; \
fi
# Final stage: Start with completely empty image (scratch) # Final stage: Start with completely empty image (scratch)
# This ensures absolute minimum size - no OS layer at all # This ensures absolute minimum size - no OS layer at all