core not generating for raise(SIGABRT)

chakka.lokesh · 05-31-2020, 03:57 AM

I have set

Quote:

ulimit -c unlimited

Following is the sample code I have written :

Code:

#define _GNU_SOURCE

#include<signal.h>
#include<stdlib.h>
#include<stdio.h>
#include<unistd.h>

int main()
{
	raise( SIGABRT );
	if( setresuid( 0, 0, 0 ) == -1 )
	{
		fprintf( stderr, "%s %d\n", __func__, __LINE__ );
		exit(1);
	}
	return 0;
}

Following are the commands I am executing :

Quote:

$ gcc dump.c
$ sudo chown root:root a.out
$ sudo chmod +s a.out
$ ./a.out
$ sudo ./a.out

If I try ./a.out, core is not getting generated. But core is getting generated for sudo ./a.out. Is there a way I can generate the core just by using ./a.out

NevemTeve · 05-31-2020, 04:02 AM

You mean setuid binary doesn't generate core file? That's intentional.

chakka.lokesh · 05-31-2020, 04:13 AM

Quote:

Originally Posted by NevemTeve

You mean setuid binary doesn't generate core file?

I want the executable to escalate privileges using setresuid not by using sudo. In addition to that, core should get generated.

NevemTeve · 05-31-2020, 05:31 AM

It's not `sudo` but `setuid` what the reason is.
Try command `sudo chmod u-s a.out`.

chakka.lokesh · 06-01-2020, 02:08 AM

if I do "chmod -s"
setresuid will fail

NevemTeve · 06-01-2020, 04:34 AM

Sure.
So now we know that 'Problem Y' has no solution. What is 'Problem X'?
https://en.m.wikipedia.org/wiki/XY_problem

chakka.lokesh · 06-01-2020, 12:16 PM

Quote:

Originally Posted by NevemTeve

What is 'Problem X'?

Dear NevemTeve,

I already mentioned the problem in first post. Still I am repeating here.

without doing any changes to code, is there a way to generate core with out using sudo.

NevemTeve · 06-01-2020, 02:40 PM

No.
But you should know that I know it isn't the 'actual problem' (aka X), it is just something you think could help in solving the actual problem. (This 'side-problem' is called Y.)

chakka.lokesh · 06-02-2020, 01:14 AM

My customer wants to type only one word. He don't have patience to type two words.

He is pretty much serious in this....!!!!