{"id":52,"date":"2015-03-17T12:35:58","date_gmt":"2015-03-17T12:35:58","guid":{"rendered":"http:\/\/www.24x7serversupport.com\/24x7serversupport-blog\/?p=52"},"modified":"2023-01-24T13:55:40","modified_gmt":"2023-01-24T08:25:40","slug":"how-to-secure-tmp","status":"publish","type":"post","link":"https:\/\/www.24x7serversupport.com\/blog\/how-to-secure-tmp\/","title":{"rendered":"How to Secure \/tmp"},"content":{"rendered":"

This will cover securing \/tmp \/var\/tmp and \/dev\/shm Secure \/tmp:<\/strong><\/p>\n

Step 1: Backup your \/etc\/fstab file<\/p>\n

Code:
\ncp \/etc\/fstab \/etc\/fstab.bak<\/p>\n

Step 2: Make a 3GB file for \/tmp parition and an ext3 filesystem for tmp:<\/p>\n

Code:
\ndd if=\/dev\/zero of=\/var\/tempFS bs=1024 count=3072000 \/sbin\/mkfs.ext3 \/var\/tempFS *Change the count= to something higher if you need more space*<\/p>\n

Step 3: Create a backup copy of your current \/tmp drive:<\/p>\n

Code:
\ncp -Rpf \/tmp \/tmpbackup<\/p>\n

Step 4: Mount our new tmp parition and change permissions:<\/p>\n

Code:
\nmount -o loop,noexec,nosuid,rw \/var\/tempFS \/tmp chmod 1777 \/tmp<\/p>\n

Step 5: Copy the old data:<\/p>\n

Code:
\ncp -Rpf \/tmpbackup\/* \/tmp\/ * If your \/tmp was empty earlier, you might get this error : cp: cannot stat `\/tmp.bak\/*\u2019: No such file or directory<\/p>\n

Step 6: Edit \/etc\/fstab and add this:<\/p>\n

Code:
\nnano -w \/etc\/fstab And ADD this line:<\/p>\n

Code:
\n\/var\/tempFS \/tmp ext3 loop,nosuid,noexec,rw 0 0<\/p>\n

Step 7: Test your fstab entry:<\/p>\n

Code:
\nmount -o remount \/tmp<\/p>\n

Step 8: Verify that your \/tmp mount is working:<\/p>\n

Code:
\ndf -h Should look something like this:<\/p>\n

Code:
\n\/var\/tempFS 962M 18M 896M 2% \/tmp
\nSecure \/var\/tmp:<\/strong><\/p>\n

Step 1: Use \/tmp as \/var\/tmp.
\nCode:
\nmv \/var\/tmp \/var\/vartmp ln -s \/tmp \/var\/tmp<\/p>\n

Step 2: Copy the old data back<\/p>\n

Code:
\ncp \/var\/vartmp\/* \/tmp\/ * If your \/var\/tmp was empty earlier, you might get this error : cp: cannot stat `\/var\/vartmp\/*\u2019: No such file or directory
\nSecure \/dev\/shm:<\/strong><\/p>\n

Step 1: Edit your \/etc\/fstab:<\/p>\n

Code:
\nnano -w \/etc\/fstab Locate:<\/p>\n

Code:
\nnone \/dev\/shm tmpfs defaults,rw 0 0 Change it to:<\/p>\n

Code:
\nnone \/dev\/shm tmpfs defaults,nosuid,noexec,rw 0 0<\/p>\n

Step 2: Remount \/dev\/shm:<\/p>\n

Code:
\nmount -o remount \/dev\/shm
\nYou should restart services that uses \/tmp partition<\/p>\n","protected":false},"excerpt":{"rendered":"

This will cover securing \/tmp \/var\/tmp and \/dev\/shm Secure \/tmp: Step 1: Backup your \/etc\/fstab file Code: cp \/etc\/fstab \/etc\/fstab.bak Step 2: Make a 3GB file for \/tmp parition and an ext3 filesystem for tmp: Code: dd if=\/dev\/zero of=\/var\/tempFS bs=1024 count=3072000 \/sbin\/mkfs.ext3 \/var\/tempFS *Change the count= to something higher if you need more space* Step […]<\/p>\n","protected":false},"author":1,"featured_media":3538,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[34],"tags":[31,32],"class_list":["post-52","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","tag-centos","tag-cpanel"],"jetpack_publicize_connections":[],"yoast_head":"\nHow to Secure \/tmp \u2013 24x7serversupport-Blog<\/title>\n<meta name=\"description\" content=\"Want to know in detail how to secure\/tmp then visit us for detailed information.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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