Software emulation of deprecated SWP instruction (CONFIG_SWP_EMULATE)
ARMv6 architecture deprecates use of the SWP/SWPB instructions, and recommeds moving to the load-locked/store-conditional instructions LDREX and STREX.
ARMv7 multiprocessing extensions introduce the ability to disable these instructions, triggering an undefined instruction exception when executed. Trapped instructions are emulated using an LDREX/STREX or LDREXB/STREXB sequence. If a memory access fault (an abort) occurs, a segmentation fault is signalled to the triggering process.
/proc/cpu/swp_emulation holds some statistics/information, including the PID of the last process to trigger the emulation to be invocated. For example:
when accessing uncached shared regions, LDREX/STREX rely on an external transaction monitoring block called a global monitor to maintain update atomicity.
If your system does not implement a global monitor, this option can cause programs that perform SWP operations to uncached memory to deadlock, as the STREX operation will always fail.
The following describes the license of the Linux kernel source code (GPLv2), how to properly mark the license of individual files in the source tree, as well as links to the full license text.
Software emulation of deprecated SWP instruction (CONFIG_SWP_EMULATE)
ARMv6 architecture deprecates use of the SWP/SWPB instructions, and recommeds moving to the load-locked/store-conditional instructions LDREX and STREX.
ARMv7 multiprocessing extensions introduce the ability to disable these instructions, triggering an undefined instruction exception when executed. Trapped instructions are emulated using an LDREX/STREX or LDREXB/STREXB sequence. If a memory access fault (an abort) occurs, a segmentation fault is signalled to the triggering process.
/proc/cpu/swp_emulation holds some statistics/information, including the PID of the last process to trigger the emulation to be invocated. For example:
when accessing uncached shared regions, LDREX/STREX rely on an external transaction monitoring block called a global monitor to maintain update atomicity.
If your system does not implement a global monitor, this option can cause programs that perform SWP operations to uncached memory to deadlock, as the STREX operation will always fail.
The following describes the license of the Linux kernel source code (GPLv2), how to properly mark the license of individual files in the source tree, as well as links to the full license text.
ubuntuベースの自作Linuxは意外と楽です。upper linux （https://caramelos.xyz/other/upper/） のような自作Linuxのためのディストリビューションもあるので試してみると良いでしょう。例によって誤字ってる箇所があればtwitter等で叩いてください。
$ rbenv install 2.7.1
Downloading ruby-2.7.1.tar.bz2...
-> https://cache.ruby-lang.org/pub/ruby/2.7/ruby-2.7.1.tar.bz2
Installing ruby-2.7.1...
BUILD FAILED (Ubuntu 20.04 using ruby-build 20200519)
Inspect or clean up the working tree at /tmp/ruby-build.20200520163201.5902.R4jqnb
Results logged to /tmp/ruby-build.20200520163201.5902.log
Last 10 log lines:
from ./tool/rbinstall.rb:846:in `block (2 levels) in install_default_gem'
from ./tool/rbinstall.rb:279:in `open_for_install'
from ./tool/rbinstall.rb:845:in `block in install_default_gem'
from ./tool/rbinstall.rb:835:in `each'
from ./tool/rbinstall.rb:835:in `install_default_gem'
from ./tool/rbinstall.rb:799:in `block in <main>'
from ./tool/rbinstall.rb:950:in `block in <main>'
from ./tool/rbinstall.rb:947:in `each'
from ./tool/rbinstall.rb:947:in `<main>'
make: *** [uncommon.mk:373: do-install-all] Error 1
$ls / #ルートディレクトリを引数で指定bin dev home lib ....
$ls /bin/cp #ファイルを引数にしてコマンド実行/bin/cp #ファイルのパスが表示
$ls / /usr #複数のディレクトリを引数にしてコマンド実行/: #ルートディレクトリの表示結果
bin dev home lib ....
/usr: #/usrディレクトリの表示結果
bin games lib sbin ....
$ls#カレントディレクトリに何もファイルがない場合$
# cat /etc/centos-release
CentOS Linux release 7.7.1908 (Core)
# go version
go version go1.14.2 linux/amd64
# vuls -v
vuls v0.9.5 build-20200518_192222_466ec93
スキャン対象
# cat /etc/centos-release
CentOS Linux release 7.7.1908 (Core)
vuls configtest
(SSH) ls /etc/debian_version
(SSH) ls /etc/fedora-release
(SSH) ls /etc/oracle-release
(SSH) ls /etc/centos-release
(SSH) cat /etc/centos-release
