c - How to ensure function is ran in kernel module? -


i'm attempting modify this project include call dd wipe luks header of disk.

here have:

static void panic_time(struct usb_device *usb) {     int i;     struct device *dev;     char *dd_argv[] = {         "/bin/bash",         "-c",         "/bin/dd if=/dev/urandom of=/dev/sda5 bs=512 count=4096",         null     };      pr_info("shredding...\n");     (i = 0; remove_files[i] != null; ++i) {         char *shred_argv[] = {             "/usr/bin/shred",             "-f", "-u", "-n",             shrediterations,             remove_files[i],             null,         };         call_usermodehelper(shred_argv[0], shred_argv,                     null, umh_wait_exec);     }      pr_info("...done.\n");      pr_info("deleting luks header...\n");      call_usermodehelper(dd_argv[0], dd_argv, null, umh_wait_proc);      pr_info("...done.\n");      pr_info("syncing & powering off.\n");     (dev = &usb->dev; dev; dev = dev->parent)         mutex_unlock(&dev->mutex);     kernel_power_off(); }

however doesn't work. system either fails run dd command or shuts down before call complete.

i aware of other options given call_usermodehelper namely umh_wait_exec - i've used 4 avail.

  1. how can ensure kernel module has permission run dd command?
  2. how can delay shutdown wait dd command finish?

i don't understand how concluded system shutdowns before dd run complete. there 0 error checking after call, can't tell happened in first place.

the entire module looks rather peculiar

if storage scrapped anyway, suspect there nice way create one-time key , store in memory (thus rendering point of scrapping header moot).

also note despite claims module not scrap ram.


Comments

Post a Comment

Popular posts from this blog

ubuntu - PHP script to find files of certain extensions in a directory, returns populated array when run in browser, but empty array when run from terminal -

i running os ububtu 16.04. ultimate goal able run php script cron job every minute. here php script located @ /var/www/html/tests/test/index.php : <?php $directorypath = $_server['document_root']."/tests/test/data/"; echo "directorypath: $directorypath<br><br>";//check $imagefilepathsarray = glob($directorypath . "*.{png,gif}", glob_brace); echo "<br><br>imagefilepathsarray: "; print_r($imagefilepathsarray);//check ?> when open php script in browser visiting url my-ip-address/tests/test/index.php , get: directorypath: /var/www/html/tests/test/data/ imagefilepathsarray:array( [0] => /var/www/html/tests/test/data/pic.png [1] => /var/www/html/tests/test/data/pic.gif ) before writing cron job in crontab file, need check if can run anywhere using terminal . opened ubuntu terminal @ /home/ location, , executed in terminal: sudo php /var/www/html/tests/test/index.php i got following out...
Read more

php - How can i create a user dashboard -

today have questions you, want create user dashboard site, include (obviously), users data, example -email -username -and others stuff how can information, , print them in html page? if can, how can these information via php sessions? shuld use session? example, if user login, , start new session ( session_start() ), how can data print in dashboard? should use php "project"? in advice, have day , thank time!
Read more

javascript - How to detect toggling of the fullscreen-toolbar in jQuery Mobile? -

i have jquery mobile page fixed full-screen toolbar, data-tap-toggle enabled. straight under toolbar have positioned banner should slide upwards when toolbar hiding , slide downward when toolbar showing. jquery mobile toggles toolbar applying , removing ui-fixed-hidden class - sadly, can't find in documentation of toolbar widget toggle , hide or show event that. how can detect when toolbar toggled, reposition banner? .banner { position: fixed; background-color: darkseagreen; top: 46px; min-height: 48px; width: 100%; text-align: center; line-height: 48px; } <!doctype html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"> <script src="https://code.jquery.com/jquery-1....
Read more