this post was submitted on 29 Oct 2023
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40
Run assembly scripts from your terminal without compiling (www.youtube.com)
submitted 1 year ago by [email protected] to c/[email protected]
10 comments fedilink hide all child comments
 

Source code:

#!/usr/bin/env bash

# runasm - Assemble, link, and run multiple assembly files, then delete them.
if [[ $# -eq 0 ]]; then
    echo "Usage: runasm  [ ...]"
    echo "  - Assemble, link, and run multiple assembly files, then delete them."
    echo "  - Name of executable is the name of the first file without extension."
    exit 1
fi

object_files=()
executable_file=${1%.*}

for assembly_file in "$@"; do
    # Avengers, assemble!
    object_file="${assembly_file%.*}.o"
    as "${assembly_file}" -o "${object_file}"
    if [[ $? -ne 0 ]]; then
        exit 1
    fi
    object_files+=("${object_file}")
done

# Link
ld "${object_files[@]}" -o "${executable_file}"
if [[ $? -ne 0 ]]; then
    exit 1
fi

# Run, remove created files, and return exit code
./"${executable_file}"
exit_code=$?
rm "${object_files[@]}" "${executable_file}" > /dev/null 2>&1
exit "${exit_code}"
top 10 comments
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[–] [email protected] 56 points 1 year ago

I have two reactions: 1. The headline is rather silly. 2. There's no way this little script, although it might conceivably be useful to someone, needs to be a youtube video.

[–] [email protected] 22 points 1 year ago (2 children)

Isn't the whole point of assembly that there is no compiler?

[–] [email protected] 18 points 1 year ago

Right, they just use an assembler and a linker ...

[–] [email protected] 6 points 1 year ago

I mean they're not wrong...

This is why my next book will be titled "how to cook dinner without a compiler, GCC 4 to GCC 11 compatible!"

[–] [email protected] 16 points 1 year ago (1 children)

I was going to click on this until I saw it was a video.

[–] [email protected] 4 points 1 year ago

I need this on a t-shirt

[–] [email protected] 6 points 1 year ago

Putting aside the misleading title...

Because this writes to and then runs an executable file with a known name, this script should never be used on a multiuser system in a directory where another user has write permissions. It is vulnerable to a timing attack where the attacker copies an executable they want run with your permissions between this script creating the file and running it.

[–] [email protected] 3 points 1 year ago

I'm still super confused by this user's posts lol. I get that (some? most?) of it is satire... but then why all social media engagement farming hashtag nonsense? Or is this all part of the satire...?

[–] [email protected] 1 points 1 year ago

Perhaps we should reconsider the definition of write-only scripts.

[–] [email protected] 1 points 1 year ago

Here is an alternative Piped link(s):

https://piped.video/watch?v=kNKuRdoaNII

Source code:

Piped is a privacy-respecting open-source alternative frontend to YouTube.

I'm open-source; check me out at GitHub.