/*
** CHECKEXE.C - checksum protection for executable files
**
** by: Bob Jarvis
*/

#include <stdio.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>

static struct {
      unsigned char marker[16];
      unsigned long checksum;
} marker_struct = {"CHECKEXE MARKER",0L};

void checkexe(char *fname)
{
      FILE *fptr;
      unsigned int c;
      int first_time = 0, i;
      char buffer[14];
      unsigned long chksum = 0L;
      unsigned long l;
      unsigned long marker_offset;
      unsigned char *charptr;
      time_t tm;

      fptr = fopen(fname,"r+b");
      if(fptr == NULL)
      {
            fprintf(stderr,"checkexe : unable to open input file '%s'\n",
                  fname);
            exit(99);
      }

      setvbuf(fptr, NULL, _IOFBF, 32767);    /* try to get a 32K buffer */

   /* 
    * If this is the first time the check has been run, scan the entire file
    * to find the marker.  Otherwise proceed.
    */

      if(marker_struct.checksum == 0L)
      {
            first_time = 1;

            c = fgetc(fptr);
            while(!feof(fptr))
            {
                  if(c == (unsigned int)marker_struct.marker[0])
                  {
                        fread(buffer,sizeof(buffer),1,fptr);
                        if(memcmp(buffer,&marker_struct.marker[1],
                              sizeof(buffer)) == 0)
                        {
                              marker_offset = ftell(fptr) + 1L;
                              break;
                        }
                        fseek(fptr,-13L,SEEK_CUR);
                  }

                  c = fgetc(fptr);
            }

            if(feof(fptr))
            {
                  fprintf(stderr,"checkexe : unable to locate marker\n");
                  exit(99);
            }

      /* Change the marker field to random values */

            tm = time(NULL);

            srand((unsigned int)tm);

            for(i = 0 ; i < sizeof(marker_struct.marker) ; ++i)
                  marker_struct.marker[i] = (unsigned char) rand();

            fseek(fptr,marker_offset - sizeof(marker_struct.marker),SEEK_SET);

            fwrite(marker_struct.marker,sizeof(marker_struct.marker),1,fptr);
      }

   /* Calculate the checksum for the entire file */

      rewind(fptr);

      c = fgetc(fptr);
      for(l = 0 ; !feof(fptr) ; ++l)
      {
            chksum += (unsigned long)c;
            c = fgetc(fptr);
      }

      if(first_time)
      {
            marker_struct.checksum = chksum;
            fseek(fptr,marker_offset,SEEK_SET);
            fwrite(&marker_struct.checksum,sizeof(unsigned long),1,fptr);
      }
      else
      {
            charptr = (unsigned char*) &marker_struct.checksum;

            for(i = 0 ; i < sizeof(marker_struct.checksum) ; ++i)
                  chksum -= (unsigned long)(charptr[i]);

            if(chksum != marker_struct.checksum)
            {
                  fprintf(stderr, "\acheckexe : %s has been altered, "
                        "possibly by a virus\n", fname);
                  exit(99);
            }
      }

      fclose(fptr);
      return;
}

main(int argc, char *argv[])
{
      checkexe(argv[0]);
      return EXIT_SUCCESS;
}
n><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Michal Hocko &lt;mhocko@suse.com&gt;</td><td class='right'>2016-04-07 17:12:31 +0200</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2016-04-22 08:58:33 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/.mailmap?id=916633a403702549d37ea353e63a68e5b0dc27ad'>916633a403702549d37ea353e63a68e5b0dc27ad</a> (<a href='/cgit.cgi/linux/net-next.git/patch/.mailmap?id=916633a403702549d37ea353e63a68e5b0dc27ad'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=916633a403702549d37ea353e63a68e5b0dc27ad'>2e36d9a73b0b8781aac44e2b99fa749b7122d2ce</a> /<a href='/cgit.cgi/linux/net-next.git/tree/.mailmap?id=916633a403702549d37ea353e63a68e5b0dc27ad'>.mailmap</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/.mailmap?id=664b4e24c6145830885e854195376351b0eb3eee'>664b4e24c6145830885e854195376351b0eb3eee</a> (<a href='/cgit.cgi/linux/net-next.git/diff/.mailmap?id=916633a403702549d37ea353e63a68e5b0dc27ad&amp;id2=664b4e24c6145830885e854195376351b0eb3eee'>diff</a>)</td></tr></table>
<div class='commit-subject'>locking/rwsem: Provide down_write_killable()</div><div class='commit-msg'>Now that all the architectures implement the necessary glue code
we can introduce down_write_killable(). The only difference wrt. regular
down_write() is that the slow path waits in TASK_KILLABLE state and the
interruption by the fatal signal is reported as -EINTR to the caller.

Signed-off-by: Michal Hocko &lt;mhocko@suse.com&gt;
Cc: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Cc: Chris Zankel &lt;chris@zankel.net&gt;
Cc: David S. Miller &lt;davem@davemloft.net&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Max Filippov &lt;jcmvbkbc@gmail.com&gt;
Cc: Paul E. McKenney &lt;paulmck@linux.vnet.ibm.com&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Signed-off-by: Davidlohr Bueso &lt;dbueso@suse.de&gt;
Cc: Signed-off-by: Jason Low &lt;jason.low2@hp.com&gt;
Cc: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Tony Luck &lt;tony.luck@intel.com&gt;
Cc: linux-alpha@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: linux-s390@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Cc: linux-xtensa@linux-xtensa.org
Cc: sparclinux@vger.kernel.org
Link: http://lkml.kernel.org/r/1460041951-22347-12-git-send-email-mhocko@kernel.org
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=916633a403702549d37ea353e63a68e5b0dc27ad'>Diffstat</a> (limited to '.mailmap')</div><table summary='diffstat' class='diffstat'>