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/**
* jprobe module for debugging eCryptfs mount operations
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kprobes.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
#include <linux/mount.h>
struct jprobe_mapping_elem {
struct jprobe *jp;
char *symbol;
void *fp;
};
int jp_do_umount(struct vfsmount *mnt, int flags)
{
printk(KERN_INFO "%s: mnt = [0x%p]; flags = [0x%x]\n", __FUNCTION__,
mnt, flags);
jprobe_return();
return 0;
}
void jp_ecryptfs_kill_block_super(struct super_block *sb)
{
printk(KERN_INFO "%s: sb = [0x%p]\n", __FUNCTION__, sb);
jprobe_return();
}
void jp_ecryptfs_put_super(struct super_block *sb)
{
printk(KERN_INFO "%s: sb = [0x%p]\n", __FUNCTION__, sb);
jprobe_return();
}
void jp_ecryptfs_umount_begin(struct vfsmount *vfsmnt, int flags)
{
printk(KERN_INFO "%s: vfsmnt = [0x%p]; flags = [0x%.8x]\n",
__FUNCTION__, vfsmnt, flags);
jprobe_return();
}
int jp_ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
struct vfsmount *mnt)
{
printk(KERN_INFO "%s: fs_type = [0x%p]; flags = [0x%.8x], dev_name = "
"[%s], raw_data = [0x%p], mnt = [0x%p]\n",
__FUNCTION__, fs_type, flags, dev_name, raw_data, mnt);
jprobe_return();
return 0;
}
int jp_get_sb_nodev(struct file_system_type *fs_type,
int flags, void *data,
int (*fill_super)(struct super_block *, void *, int),
struct vfsmount *mnt)
{
printk(KERN_INFO "%s: fs_type = [0x%p]; flags = [0x%.8x], data = "
"[0x%p], mnt = [0x%p]\n",
__FUNCTION__, fs_type, flags, data, mnt);
jprobe_return();
return 0;
}
int jp_ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
{
printk(KERN_INFO "%s: sb = [0x%p]; raw_data = [0x%p], silent = [%d]\n",
__FUNCTION__, sb, raw_data, silent);
jprobe_return();
return 0;
}
int jp_ecryptfs_read_super(struct super_block *sb, const char *dev_name)
{
printk(KERN_INFO "%s: sb = [0x%p]; dev_name = [%s]\n",
__FUNCTION__, sb, dev_name);
jprobe_return();
return 0;
}
int jp_ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
struct super_block *sb, int flag)
{
printk(KERN_INFO "%s: lower_dentry = [0x%p]; dentry = [0x%p]; sb = "
"[0x%p]; flag = [0x%.8x]\n", __FUNCTION__, lower_dentry, dentry,
sb, flag);
if (flag)
printk(KERN_INFO "%s: d_add() will be called\n", __FUNCTION__);
else
printk(KERN_INFO "%s: d_instantiate() will be called\n",
__FUNCTION__);
jprobe_return();
return 0;
}
asmlinkage long jp_sys_umount(char __user * name, int flags)
{
char *tmp = getname(name);
if (!IS_ERR(tmp)) {
printk(KERN_INFO "%s: name = [%s]; flags = [0x%x]\n",
__FUNCTION__, tmp, flags);
putname(tmp);
} else
printk(KERN_INFO "%s: (getname failed); flags = [0x%x]\n",
__FUNCTION__, flags);
jprobe_return();
return 0;
}
struct jprobe_mapping_elem jprobe_mapping[] = {
{NULL, "ecryptfs_kill_block_super", jp_ecryptfs_kill_block_super},
{NULL, "ecryptfs_put_super", jp_ecryptfs_put_super},
{NULL, "ecryptfs_umount_begin", jp_ecryptfs_umount_begin},
{NULL, "ecryptfs_get_sb", jp_ecryptfs_get_sb},
{NULL, "get_sb_nodev", jp_get_sb_nodev},
{NULL, "ecryptfs_fill_super", jp_ecryptfs_fill_super},
{NULL, "ecryptfs_read_super", jp_ecryptfs_read_super},
{NULL, "sys_umount", jp_sys_umount},
{NULL, "do_umount", jp_do_umount},
/* {NULL, "ecryptfs_interpose", jp_ecryptfs_interpose} */
};
static int __init jprobe_mount_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(jprobe_mapping); i++) {
jprobe_mapping[i].jp = kmalloc(sizeof(struct jprobe),
GFP_KERNEL);
jprobe_mapping[i].jp->entry = jprobe_mapping[i].fp;
jprobe_mapping[i].jp->kp.addr = (kprobe_opcode_t *)
kallsyms_lookup_name(jprobe_mapping[i].symbol);
if (jprobe_mapping[i].jp->kp.addr == NULL) {
int j;
printk(KERN_NOTICE "Unable to find symbol [%s]\n",
jprobe_mapping[i].symbol);
for (j = 0; j < i; j++) {
unregister_jprobe(jprobe_mapping[j].jp);
kfree(jprobe_mapping[j].jp);
}
return -EINVAL;
}
register_jprobe(jprobe_mapping[i].jp);
}
return 0;
}
static void __exit jprobe_mount_exit(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(jprobe_mapping); i++) {
unregister_jprobe(jprobe_mapping[i].jp);
kfree(jprobe_mapping[i].jp);
}
}
module_init(jprobe_mount_init);
module_exit(jprobe_mount_exit);
MODULE_LICENSE("GPL");
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