diff --git a/one_gadget/SOURCES/rubygem-bindata-2.4.10.tar.gz b/one_gadget/SOURCES/rubygem-bindata-2.4.10.tar.gz
new file mode 100644
index 0000000..eb3d2b5
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diff --git a/one_gadget/SOURCES/rubygem-bindata-fix-gemspec-files.patch b/one_gadget/SOURCES/rubygem-bindata-fix-gemspec-files.patch
new file mode 100644
index 0000000..e186b0f
--- /dev/null
+++ b/one_gadget/SOURCES/rubygem-bindata-fix-gemspec-files.patch
@@ -0,0 +1,12 @@
+diff -u a/bindata.gemspec b/bindata.gemspec
+--- a/bindata.gemspec	2021-05-21 13:29:34.158562502 +0100
++++ b/bindata.gemspec	2021-05-21 13:42:00.930029375 +0100
+@@ -12,7 +12,7 @@
+   s.require_path = 'lib'
+   s.extra_rdoc_files = ['NEWS.rdoc']
+   s.rdoc_options << '--main' << 'NEWS.rdoc'
+-  s.files = `git ls-files`.split("\n")
++  s.files = Dir['lib/**/*.rb'] + %w(README.md)
+   s.license = 'Ruby'
+ 
+   s.add_development_dependency('rake')
diff --git a/one_gadget/create_srpm.sh b/one_gadget/create_srpm.sh
new file mode 100755
index 0000000..5b54cdf
--- /dev/null
+++ b/one_gadget/create_srpm.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+rpmbuild --define "_topdir `pwd`" -bs rubygem-bindata.spec
+mv SRPMS/* .
+rmdir BUILDROOT RPMS SRPMS BUILD
diff --git a/one_gadget/one_gadget.spec b/one_gadget/one_gadget.spec
new file mode 100644
index 0000000..70a99d0
--- /dev/null
+++ b/one_gadget/one_gadget.spec
@@ -0,0 +1,41 @@
+%define debug_package %{nil}
+
+%define gem_name one_gadget
+
+Name:           %{gem_name}
+Version:        1.7.4
+Release:        1%{?dist}
+Summary:        Tool to find an execve call to /bin/sh
+
+License:        MIT
+URL:            https://github.com/david942j/%{gem_name}
+Source:         https://github.com/david942j/%{gem_name}/archive/refs/tags/v%{version}.tar.gz
+
+BuildRequires:  rubygems-devel
+BuildArch:      noarch
+
+%description
+When playing ctf pwn challenges we usually need the one-gadget RCE 
+(remote code execution), which leads to call execve('/bin/sh', NULL, NULL).
+
+%prep
+%autosetup -n %{gem_name}-%{version}
+
+%build
+gem build %{gem_name}.gemspec
+%gem_install
+
+%install
+mkdir -p %{buildroot}%{gem_dir}
+cp -a ./%{gem_dir}/* %{buildroot}%{gem_dir}/
+mkdir -p %{buildroot}%{_bindir}
+cp -a ./%{_bindir}/* %{buildroot}%{_bindir}
+
+%files
+%_bindir/*
+%{gem_dir}/*
+%doc LICENSE README.md
+
+%changelog
+* Fri May 21 2021 Carlos Mogas da Silva <r3pek@r3pek.org> - 1.7.4-1
+- Initial import
\ No newline at end of file
diff --git a/one_gadget/rubygem-bindata-2.4.10-1.fc34.src.rpm b/one_gadget/rubygem-bindata-2.4.10-1.fc34.src.rpm
new file mode 100644
index 0000000..ff1aee4
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diff --git a/one_gadget/rubygem-bindata.spec b/one_gadget/rubygem-bindata.spec
new file mode 100644
index 0000000..2924c1b
--- /dev/null
+++ b/one_gadget/rubygem-bindata.spec
@@ -0,0 +1,40 @@
+%define debug_package %{nil}
+
+%define gem_name bindata
+
+Name:           rubygem-%{gem_name}
+Version:        2.4.10
+Release:        1%{?dist}
+Summary:        BinData provides a declarative way to read and write structured binary data.
+
+License:        BSD-2-Clause
+URL:            https://github.com/dmendel/%{gem_name}
+Source:         %{name}-%{version}.tar.gz
+Patch:          rubygem-bindata-fix-gemspec-files.patch
+
+BuildRequires:  rubygems-devel
+BuildArch:      noarch
+
+%description
+BinData makes it easy to create new data types.
+It supports all the common primitive datatypes that are found in structured binary data formats.
+Support for dependent and variable length fields is built in.
+
+%prep
+%autosetup -n %{gem_name}-%{version}
+
+%build
+gem build %{gem_name}.gemspec
+%gem_install
+
+%install
+mkdir -p %{buildroot}%{gem_dir}
+cp -a ./%{gem_dir}/* %{buildroot}%{gem_dir}/
+
+%files
+%{gem_dir}/*
+%doc BSDL README.md
+
+%changelog
+* Fri May 21 2021 Carlos Mogas da Silva <r3pek@r3pek.org> - 2.4.10-1
+- Initial import
\ No newline at end of file
diff --git a/one_gadget/rubygem-elftools.spec b/one_gadget/rubygem-elftools.spec
new file mode 100644
index 0000000..de8e793
--- /dev/null
+++ b/one_gadget/rubygem-elftools.spec
@@ -0,0 +1,37 @@
+%define debug_package %{nil}
+
+%define gem_name elftools
+
+Name:           rubygem-%{gem_name}
+Version:        1.1.3
+Release:        1%{?dist}
+Summary:        Pure ruby library for parsing and patching ELF files.
+
+License:        MIT
+URL:            https://github.com/david942j/rb%{gem_name}
+Source:         https://github.com/david942j/rb%{gem_name}/archive/refs/tags/v%{version}.tar.gz
+
+BuildRequires:  rubygems-devel
+BuildArch:      noarch
+
+%description
+ELF parser in pure ruby implementation. This work is inspired by pyelftools by Eli Bendersky.
+
+%prep
+%autosetup -n rb%{gem_name}-%{version}
+
+%build
+gem build %{gem_name}.gemspec
+%gem_install
+
+%install
+mkdir -p %{buildroot}%{gem_dir}
+cp -a ./%{gem_dir}/* %{buildroot}%{gem_dir}/
+
+%files
+%{gem_dir}/*
+%doc LICENSE README.md
+
+%changelog
+* Fri May 21 2021 Carlos Mogas da Silva <r3pek@r3pek.org> - 1.1.3-1
+- Initial import
\ No newline at end of file