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#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/mm_types.h>
#include <linux/fs.h>
#include "proc_filters.h"
#include <sspt/sspt.h>
static int check_dentry(struct task_struct *task, struct dentry *dentry)
{
struct vm_area_struct *vma;
struct mm_struct *mm = task->mm;
if (mm == NULL) {
return 0;
}
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (check_vma(vma) && vma->vm_file->f_dentry == dentry) {
return 1;
}
}
return 0;
}
static struct task_struct *call_by_dentry(struct proc_filter *self,
struct task_struct *task)
{
struct dentry *dentry = (struct dentry *)self->data;
if (!dentry || check_dentry(task, dentry))
return task;
return NULL;
}
static struct task_struct *call_by_tgid(struct proc_filter *self,
struct task_struct *task)
{
pid_t tgid = (pid_t)self->data;
if (task->tgid == tgid)
return task;
return NULL;
}
static struct proc_filter *create_pf(void)
{
struct proc_filter *pf = kmalloc(sizeof(*pf), GFP_KERNEL);
return pf;
}
struct proc_filter *create_pf_by_dentry(struct dentry *dentry)
{
struct proc_filter *pf = create_pf();
pf->call = &call_by_dentry;
pf->data = (void *)dentry;
return pf;
}
struct proc_filter *create_pf_by_tgid(pid_t tgid)
{
struct proc_filter *pf = create_pf();
pf->call = &call_by_tgid;
pf->data = (void *)tgid;
return pf;
}
void free_pf(struct proc_filter *pf)
{
kfree(pf);
}
int check_pf_by_dentry(struct proc_filter *filter, struct dentry *dentry)
{
return filter->data == (void *)dentry &&
filter->call == &call_by_dentry;
}
int check_pf_by_tgid(struct proc_filter *filter, pid_t tgid)
{
return filter->data == (void *)tgid && filter->call == &call_by_tgid;
}
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