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Enable probe for lookup_slow
author
Sapan Bhatia
<gwsapan@gmail.com>
Wed, 12 Dec 2012 17:09:05 +0000
(12:09 -0500)
committer
Sapan Bhatia
<gwsapan@gmail.com>
Wed, 12 Dec 2012 17:09:05 +0000
(12:09 -0500)
procprotect.c
patch
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diff --git
a/procprotect.c
b/procprotect.c
index
30497f4
..
c59d42e
100644
(file)
--- a/
procprotect.c
+++ b/
procprotect.c
@@
-46,6
+46,7
@@
MODULE_VERSION(VERSION_STR);
struct procprotect_ctx {
struct inode **inode;
struct procprotect_ctx {
struct inode **inode;
+ struct qstr *q;
struct path *path;
int flags;
};
struct path *path;
int flags;
};
@@
-111,19
+112,12
@@
static int lookup_fast_ret(struct kretprobe_instance *ri, struct pt_regs *regs)
if (ret==0) {
/* The kernel is going to honor the request. Here's where we step in */
struct inode *inode = *(ctx->inode);
if (ret==0) {
/* The kernel is going to honor the request. Here's where we step in */
struct inode *inode = *(ctx->inode);
- printk(KERN_CRIT "Inode=%u",inode->i_ino);
if (!run_acl(inode->i_ino)) {
if (current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {
regs->ax = -EPERM;
}
}
}
if (!run_acl(inode->i_ino)) {
if (current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {
regs->ax = -EPERM;
}
}
}
- else if (ret==1) {
- if (!printed) {
- dump_stack();
- printed=1;
- }
- }
return 0;
return 0;
@@
-139,10
+133,13
@@
static int lookup_slow_entry(struct kretprobe_instance *ri, struct pt_regs *regs
struct dentry *parent = nd->path.dentry;
struct inode *pinode = parent->d_inode;
struct dentry *parent = nd->path.dentry;
struct inode *pinode = parent->d_inode;
- printk(KERN_CRIT "Entered lookup slow");
+
+
if (pinode->i_sb->s_magic == PROC_SUPER_MAGIC
&& current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {
if (pinode->i_sb->s_magic == PROC_SUPER_MAGIC
&& current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {
+
ctx = (struct procprotect_ctx *) ri->data;
ctx = (struct procprotect_ctx *) ri->data;
+ ctx->q = q;
ctx->flags = nd->flags;
ctx->path = p;
ret = 0;
ctx->flags = nd->flags;
ctx->path = p;
ret = 0;
@@
-163,7
+160,6
@@
static int lookup_slow_ret(struct kretprobe_instance *ri, struct pt_regs *regs)
/* The kernel is going to honor the request. Here's where we step in */
struct path *p = ctx->path;
struct inode *inode = p->dentry->d_inode;
/* The kernel is going to honor the request. Here's where we step in */
struct path *p = ctx->path;
struct inode *inode = p->dentry->d_inode;
- printk(KERN_CRIT "Looking at inode %x",inode);
if (!run_acl(inode->i_ino)) {
if (current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {
regs->ax = -EPERM;
if (!run_acl(inode->i_ino)) {
if (current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {
regs->ax = -EPERM;
@@
-240,6
+236,7
@@
static void add_entry(char *pathname) {
static void __exit procprotect_exit(void)
{
unregister_kretprobe(&fast_probe);
static void __exit procprotect_exit(void)
{
unregister_kretprobe(&fast_probe);
+ unregister_kretprobe(&slow_probe);
unregister_jprobe(&dolast_probe);
struct hlist_node *n;
struct acl_entry *entry;
unregister_jprobe(&dolast_probe);
struct hlist_node *n;
struct acl_entry *entry;
@@
-300,14
+297,12
@@
static int __init procprotect_init(void)
return -1;
}
return -1;
}
- /*
slow_probe.kp.addr =
(kprobe_opcode_t *) kallsyms_lookup_name("lookup_slow");
if (!slow_probe.kp.addr) {
printk("Couldn't find %s to plant kretprobe\n", "lookup_slow");
return -1;
}
slow_probe.kp.addr =
(kprobe_opcode_t *) kallsyms_lookup_name("lookup_slow");
if (!slow_probe.kp.addr) {
printk("Couldn't find %s to plant kretprobe\n", "lookup_slow");
return -1;
}
- */
dolast_probe.kp.addr =
(kprobe_opcode_t *) kallsyms_lookup_name("do_last");
dolast_probe.kp.addr =
(kprobe_opcode_t *) kallsyms_lookup_name("do_last");
@@
-326,9
+321,17
@@
static int __init procprotect_init(void)
printk("register_kretprobe failed, returned %d\n", ret);
return -1;
}
printk("register_kretprobe failed, returned %d\n", ret);
return -1;
}
+
printk("Planted kretprobe at %p, handler addr %p\n",
fast_probe.kp.addr, fast_probe.handler);
printk("Planted kretprobe at %p, handler addr %p\n",
fast_probe.kp.addr, fast_probe.handler);
+ if ((ret = register_kretprobe(&slow_probe)) <0) {
+ printk("register_kretprobe failed, returned %d\n", ret);
+ return -1;
+ }
+ printk("Planted kretprobe at %p, handler addr %p\n",
+ slow_probe.kp.addr, slow_probe.handler);
+
proc_entry = create_proc_entry("procprotect", 0644, NULL);
proc_entry->write_proc = procfile_write;
proc_entry = create_proc_entry("procprotect", 0644, NULL);
proc_entry->write_proc = procfile_write;