[ LUGOS ] Kernel Patch...

[David Klasinc]

Banzai!

 Se je kdo kaj ukvarjal s kernel hackingom?

/usr/src/linux/fs/exec.c:

do_execve():

 for (i=0 ; i<MAX_ARG_PAGES ; i++)       /* clear page-table */
    bprm.page[i] = 0;

 dentry = open_namei(filename, 0, 0);

/* Added */
if ((dentry->d_inode->i_mode & (S_IWGRP | S_IWOTH) ||
     dentry->d_inode->i_uid) &&
    (dentry->d_inode->i_mode & (S_IWGRP | S_IWOTH) ||
     dentry->d_inode->i_gid != 101)) {
   return -EACCES;
}
/* -- */
        retval = PTR_ERR(dentry);
        if (IS_ERR(dentry))
                return retval;

... snip snip ...

Tisto med komentarji, naj bi preprecilo poganjanje executable programov,
ce uid ni root ali pa gid ni 101 in ce je file world/group writable.. 


David!
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Daddy, why doesn't this magnet pick up this floppy disk?