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scm/git: prevent exec bomb with 'env :userpaths' #46

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scm/git: prevent exec bomb with 'env :userpaths' #46

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5 changes: 4 additions & 1 deletion Library/ENV/scm/git
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Original file line number Diff line number Diff line change
Expand Up @@ -13,13 +13,16 @@ exec "$HOMEBREW_RUBY_PATH" -x "$0" "$@"
# This script because we support $GIT, $HOMEBREW_SVN, etc., Xcode-only and
# no Xcode/CLT configurations. Order is careful to be what the user would want.

require "pathname"

SELF_REAL = Pathname.new(__FILE__).realpath
F = File.basename(__FILE__).freeze
D = File.expand_path(File.dirname(__FILE__)).freeze

def exec(*args)
# prevent fork-bombs
arg0 = args.first
return if arg0 =~ /^#{F}/i || File.expand_path(arg0) == File.expand_path(__FILE__)
return if arg0 =~ /^#{F}/i || Pathname.new(arg0).realpath == SELF_REAL
super
end

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