Author Archives: jasiu

Jak rozwiązać równanie z dwiema niewiadomymi

Posted on by
Reply

Z pomocą idzie sagemath
http://doc.sagemath.org/html/en/reference/calculus/sage/symbolic/expression.html

Są również inne programy np. Derive, dostępne tutaj [1] [2]
Wystarczy zdefiniować poszczególne równania dla x i y
Zaznaczyć #1 #2
Wykonać SOLVE dla równań #1 i #2 czyli Solve->System (Ctrl+Shift+Y), wpisując w oknie ‘Solve 2 equation(s)’ w polu 1 – #1, w polu 2 – #2
Na równaniu #3 wykonać Simplify (Ctrl+B)
Po otrzymaniu wyniku na #4 wykonać Approximate (Ctrl+G)

Problems installing mate-icon-theme on FreeBSD

Posted on by
Reply

[Update]
Try to rebuild mapping util

# pkg which /usr/local/libexec/icon-name-mapping
/usr/local/libexec/icon-name-mapping was installed by package icon-naming-utils-0.8.90_1            
# portmaster -D icon-naming-utils

Just in case mount yours ports tree on /usr/ports


# mount -t nullfs /usr/jails/ports /usr/ports

Build and install package


# make install
===>  Installing for mate-icon-theme-1.18.2
===>  Checking if mate-icon-theme already installed
===>   Registering installation for mate-icon-theme-1.18.2
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/add.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/appointment.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/back.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/bookmark_add.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/bookmarks_list_add.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/bottom.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/centrejust.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/down.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/editclear.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/mate/16x16/actions/editcopy.png:No such file or directory

(snip)

pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/menta/48x48/status/gnome-netstatus-txrx.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/menta/48x48/status/nm-adhoc.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/menta/48x48/status/nm-device-wired.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/menta/48x48/status/nm-device-wireless.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/menta/48x48/status/nm-no-connection.png:No such file or directory
pkg-static: Unable to access file /usr/ports/x11-themes/mate-icon-theme/work/stage/usr/local/share/icons/menta/48x48/status/stock_open.png:No such file or directory
*** Error code 74

Stop.
make: stopped in /usr/ports/x11-themes/mate-icon-theme

Create text file with output and create not existing files then finally install package


# make install > & output.txt
# cat output.txt | grep Unable | awk '{print $6}' | cut -d ':' -f 1 | xargs touch

# make install
===>  Installing for mate-icon-theme-1.18.2
===>  Checking if mate-icon-theme already installed
===>   Registering installation for mate-icon-theme-1.18.2
Installing mate-icon-theme-1.18.2...

Meltdown and Spectre

Posted on by
Reply
  • CVE-2017-5715 (branch target injection – Spectre)
  • CVE-2017-5753 (bounds check bypass – Spectre)
  • CVE-2017-5754 (rogue data cache load – Meltdown)

Meltdown
https://security.archlinux.org/CVE-2017-5754

Lokalny, łatwiejszy to załatania, występuje na procesorach Intela

Spectre
https://security.archlinux.org/CVE-2017-5715
https://security.archlinux.org/CVE-2017-5753

Zdalny, trudniejszy do za latania, występuje na różnych procesorach Intel, AMD, ARM

Status w systemie FreeBSD
https://reviews.freebsd.org/D13797
Informacja z list dyskusyjnych
https://lists.freebsd.org/pipermail/freebsd-security/2018-January/009719.html

Lista patchy per OS (link z OVH)
https://docs.ovh.com/fr/dedicated/meltdown-spectre-kernel-update-per-operating-system/

Komentarz związany z Nginx
https://www.nginx.com/blog/nginx-response-to-the-meltdown-and-spectre-vulnerabilities/

Checker dla Linuxa
https://github.com/speed47/spectre-meltdown-checker

Log X-Forwarded-For

Posted on by
Reply

https://httpd.apache.org/docs/current/mod/mod_remoteip.html
https://www.loadbalancer.org/blog/apache-and-x-forwarded-for-headers/

uncoment
#LoadModule remoteip_module libexec/apache24/mod_remoteip.so

In section add:
RemoteIPHeader X-Forwarded-For
LogFormat “%{X-Forwarded-For}i %h %l %u %t \”%r\” %>s %b \”%{Referer}i\” \”%{User-Agent}i\ ” combine
LogFormat “%{X-Forwarded-For}i %h %l %u %t \”%r\” %s %b \”%{Referer}i\” \”%{User-agent}i\”” combined-forwarded

# apachectl configtest
# /usr/local/etc/rc.d/apache24 restart

GPG

Posted on by
Reply

Jak zainstalować gpg
W Linux/Unix
zainstaluj gnupg, kgpg, kleopatra
https://gnupg.org/software/frontends.html

W Windows
https://www.gpg4win.org
lub
Zainteresuj się choco
Zainstaluj Gpg4Win
C:\> choco install gpg4win

Jak wyeksportować klucz prywatny
List (private) secret keys
$ gpg -K
Export private key
$ gpg --export-secret-key -a keynumber > private_mykey1.key

Gdzie w Linux/Unix trzymane są klucze
~/.gnupg

Gdzie w Windows trzymane są klucze
c:\Users\user\Appdata\Roaming\gnupg

Jak zaimportować klucz z serwera kluczy
gpg --keyserver key.server.url --recv-keys keyid

slow graid mirror rebuild

Posted on by
Reply

Setting kern.geom.raid.idle_threshold to lower value increases speed of rebuilding graid mirror and transfer on ada1 disk
https://www.freebsd.org/cgi/man.cgi?graid(8)

root@thirdeye:/usr/ports # sysctl kern.geom.raid.idle_threshold=1000000
kern.geom.raid.idle_threshold: 10000 -> 1000000
root@thirdeye:/usr/ports # iostat 1 -1
       tty            ada0             ada1             ada2             cpu
 tin  tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
   0     3 59.55  18  1.06  114.09   7  0.80   6.10   2  0.01   2  0  1  0 97
   0   533 86.86  14  1.18  128.00   8  0.99   0.00   0  0.00   0  0  0  0 100
   0   374 32.00   6  0.19   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   194 32.00   6  0.19   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   193 32.00   6  0.19   0.00   0  0.00   0.00   0  0.00   1  0  0  0 99
   0   190 80.00  16  1.23  128.00   8  0.99   0.00   0  0.00   1  0  1  0 99
   0   197 32.00   2  0.06   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   188 32.00   4  0.12   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   199 32.00   6  0.19   0.00   0  0.00   0.00   0  0.00   0  0  0  0 99
   0   194 96.00  12  1.14  128.00   8  1.01   0.00   0  0.00   3  0  0  0 97
   0   186 35.56   9  0.30   0.00   0  0.00   0.00   0  0.00   5  0  1  0 94
   0   195 108.80  20  2.16  128.00  16  2.03   0.00   0  0.00   0  0  0  0 100
   0   200 32.00   4  0.13   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
^C   3   294 32.00   3  0.09   0.00   0  0.00   0.00   0  0.00   1  0  1  0 99
root@thirdeye:/usr/ports # sysctl kern.geom.raid.idle_threshold=10000
kern.geom.raid.idle_threshold: 1000000 -> 10000
root@thirdeye:/usr/ports # iostat 1 -1
       tty            ada0             ada1             ada2             cpu
 tin  tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
   0     3 59.57  18  1.07  114.09   7  0.80   6.10   2  0.01   2  0  1  0 97
   0   536 126.54 478 59.02  127.74 473 58.95   0.00   0  0.00   7  0  2  0 91
   0   373 126.37 427 52.75  127.26 425 52.88   0.00   0  0.00  11  0  1  0 88
   0   196 127.16 459 56.94  128.00 448 56.06   0.00   0  0.00   2  0  1  0 97
   0   188 126.36 451 55.60  128.00 446 55.72   0.00   0  0.00   2  0  1  0 97
   0   205 126.31 387 47.78  127.34 386 48.04   0.00   0  0.00   0  0  1  0 99
   0   196 127.15 451 55.97  128.00 440 54.97   0.00   0  0.00   0  0  0  0 99
   0   196 126.73 456 56.40  128.00 457 57.09   0.00   0  0.00   0  0  0  0 100
   0   197 126.09 434 53.39  128.00 423 52.83   0.00   0  0.00   0  0  0  0 99
   0   197 126.67 433 53.58  128.00 425 53.14   0.00   0  0.00   0  0  0  0 100
   0   198 126.91 441 54.69  127.78 441 55.07   0.00   0  0.00   0  0  0  0 99
   0   196 127.24 420 52.20  127.70 417 52.02   0.00   0  0.00   0  0  0  0 99
   0   193 126.75 453 56.13  128.00 441 55.08   0.00   0  0.00   0  0  0  0 99
   0   199 127.14 452 56.16  128.00 454 56.79   0.00   0  0.00   0  0  3  1 96
   0   196 125.17 427 52.19  126.96 421 52.19   0.00   0  0.00   6  0  1  1 93
   0   195 125.48 417 51.09  128.00 398 49.75   0.00   0  0.00  15  0  3  0 82
   0   193 126.76 460 56.89  128.00 458 57.20   0.00   0  0.00   5  0  1  0 94
   0   198 126.66 434 53.62  128.00 428 53.56   0.00   0  0.00   0  0  0  0 99
   0   194 126.51 447 55.19  127.79 444 55.38   0.00   0  0.00   5  0  2  0 92
   0   200 127.11 441 54.70  128.00 433 54.07   0.00   0  0.00   0  0  0  0 100
   0   193 127.14 435 54.04  128.00 429 53.67   0.00   0  0.00   0  0  0  1 99
^C   2   227 127.02 450 55.80  128.00 449 56.08   0.00   0  0.00   0  0  0  0 100
root@thirdeye:/usr/ports # graid status
   Name    Status  Components
raid/r0  DEGRADED  ada0 (ACTIVE (ACTIVE))
                   ada1 (ACTIVE (REBUILD 46%))
raid/r1   OPTIMAL  ada2 (ACTIVE (ACTIVE))
                   ada3 (ACTIVE (ACTIVE))