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Old 10-19-2004, 08:30 AM   #1
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s bit VS core file


I just discovered that by setting a S bit to an executable, it will prevent it from generating a core file ? Is there a security reason behind it ? Is it possible that I can change this behaviour so that I can ALWAYS get a core file regardless of the setting of S bit ?


Old 10-19-2004, 06:32 PM   #2
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I wasn't aware of this. Have you checked root's home directory to see if the core file is there?

Old 10-20-2004, 11:26 AM   #3
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Thanks Hakan for your reply. I have checked the whole harddisk and I am sure that there is no trace of the core file. The core file will generate right away if I remove S-bit or change the ownership of the file to be non-root though.

Here is the piece of code that you can try to produce the core dump.

#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>

int main(int argc, char *argv[]) {

printf("Program started\n");

/* This program should end and produces a core dump here */
kill(getpid(), SIGSEGV);

printf("Program ended\n");
return 0;

Once you change the program file property:

chown root.root a.out
chmod a+s a.out

No core file will be generated.



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