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Special Forums Cybersecurity root cannot write to Linux RAM Post 302583898 by Alux on Wednesday 21st of December 2011 02:20:20 PM
Old 12-21-2011
Code:
void main() {

char buf[16384];
int fd=open("/dev/kmem", 'r');
read(fd, buf, 16384); // first 16KB of kernel mem
int x;
for(x =0;;x++) {

printf("%c", buf[x]);

}


}

This is the modified code.



Apologies for writing to you again. But, my purpose of this code is to write 'Alux' to RAM, then read it back again. In the kernel. I used to do similar things on the Commodore 64. There was a 'poke' command.

Code:
void main() {

char buf[16384];
int fd=open("/dev/kmem", 'r');
int x, y;
int *test;
for (y = 0; y < 18446744073709551615; y++) {
read(fd, buf, 16384); // first 16KB of kernel mem
test = fd;
for(x =0;x < 16384;x++) {

printf("%c", test[x]);

}

}
close(fd);
}


Last edited by Alux; 12-21-2011 at 03:34 PM..
 

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pam_stack(8)						   System Administrator's Manual					      pam_stack(8)

NAME
pam_stack - recurse into other PAM stacks SYNOPSIS
auth required /lib/security/pam_stack.so service=foo session optional /lib/security/pam_stack.so service=foo password optional /lib/security/pam_stack.so service=foo account optional /lib/security/pam_stack.so service=foo DESCRIPTION
In a nutshell, pam_stack lets you "call", from inside of the stack for a particular service, the stack defined for any another service. The intention is to allow multiple services to "include" a system-wide setup, so that when that setup needs to be changed, it need only be changed in one place. ARGUMENTS
debug turns on debugging via syslog(3). service=name tells pam_stack.so to execute the stack defined for the service name, which will usually be another file in /etc/pam.d. EXAMPLE
/etc/pam.d/imap: auth required /lib/security/pam_stack.so service=system-auth auth required /lib/security/pam_shells.so /etc/pam.d/system-auth: auth sufficient /lib/security/pam_krb5.so auth sufficient /lib/security/pam_unix.so shadow nullok auth required /lib/security/pam_deny.so CAVEAT
Because recursion is fully supported, there is potential to really break things by having a stack call itself either directly or via mutual recursion. BUGS
Let's hope not, but if you find any, please email the author. AUTHOR
Nalin Dahyabhai <nalin@redhat.com> Red Hat Linux 2001/01/30 pam_stack(8)
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