#include <linux/kallsyms.h>
#include <linux/nsproxy.h>
+#include <linux/magic.h>
+#include <linux/slab.h>
+#include <linux/module.h> /* Specifically, a module */
+#include <linux/kernel.h> /* We're doing kernel work */
+#include <linux/proc_fs.h> /* Necessary because we use the proc fs */
+
#define VERSION_STR "0.0.1"
#ifndef CONFIG_X86_64
#error "This code does not support your architecture"
#endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
static char *aclpath = "procprotect";
-#else
-static char *aclpath __devinitdata = "procprotect";
-#endif
static struct qstr aclqpath;
struct hlist_node hlist;
};
-#define HASH_SIZE (1<<16)
+#define HASH_SIZE (1<<10)
struct hlist_head procprotect_hash[HASH_SIZE];
struct proc_dir_entry *proc_entry;
static int run_acl(unsigned long ino) {
- struct hlist_node *n;
struct acl_entry *entry;
- hlist_for_each_entry_rcu(entry,
- n, &procprotect_hash[ino & (HASH_SIZE-1)],
- hlist) {
+ hlist_for_each_entry_rcu_notrace(entry,
+ &procprotect_hash[ino & (HASH_SIZE-1)],
+ hlist) {
if (entry->ino==ino) {
return 0;
}
int ret = -1;
struct procprotect_ctx *ctx;
struct nameidata *nd = (struct nameidata *) regs->di;
- struct qstr *q = (struct qstr *) regs->si;
- struct dentry *parent = nd->path.dentry;
- struct inode *pinode = parent->d_inode;
+ struct dentry *parent;
+ struct inode *pinode;
+
+ if (!nd) return ret;
+ parent = nd->path.dentry;
+
+ if (!parent) return ret;
+ pinode = parent->d_inode;
+
+ if (!pinode || !pinode->i_sb || !current || !current->nsproxy) return ret;
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->inode = regs->cx;
+ ctx->inode = regs->dx;
ctx->flags = nd->flags;
ret = 0;
}
int ret = -1;
struct procprotect_ctx *ctx;
struct nameidata *nd = (struct nameidata *) regs->di;
- struct qstr *q = (struct qstr *) regs->si;
- struct path *p = (struct path *) regs->dx;
+ struct path *p = (struct path *) regs->si;
+ struct dentry *parent;
+ struct inode *pinode;
- struct dentry *parent = nd->path.dentry;
- struct inode *pinode = parent->d_inode;
-
-
+ if (!nd) return;
+ parent = nd->path.dentry;
+ if (!parent) return;
+ pinode= parent->d_inode;
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->q = q;
+ ctx->q = &nd->last;
ctx->flags = nd->flags;
ctx->path = p;
ret = 0;
/* The entry hook ensures that the return hook is only called for
accesses to /proc */
+static int print_once = 0;
+
static int lookup_slow_ret(struct kretprobe_instance *ri, struct pt_regs *regs)
{
- struct procprotect_ctx *ctx = (struct procprotect_ctx *) ri->data;
- int ret = regs->ax;
+ struct procprotect_ctx *ctx;
+ int ret;
+
+ if (!ri || !ri->data) {return 0;}
+ ctx = (struct procprotect_ctx *) ri->data;
+
+ ret = regs->ax;
if (ret==0) {
- /* The kernel is going to honor the request. Here's where we step in */
- /*struct qstr *q = ctx->q;
- if (!strncmp(q->name,"sysrq-trigger",13)) {
- printk(KERN_CRIT "lookup_slow sysrqtrigger");
- }*/
struct path *p = ctx->path;
+ if (!p || !p->dentry || !p->dentry->d_inode /* This last check was responsible for the f18 bug*/) {
+ return 0;
+ }
struct inode *inode = p->dentry->d_inode;
if (!run_acl(inode->i_ino)) {
regs->ax = -EPERM;
.data_size = sizeof(struct procprotect_ctx)
};
+int once_only = 0;
+
+static int init_probes(void) {
+ int ret;
+ dolast_probe.kp.addr =
+ (kprobe_opcode_t *) kallsyms_lookup_name("do_last");
+
+ if (!dolast_probe.kp.addr) {
+ printk("Couldn't find %s to plant kretprobe\n", "do_last");
+ return -1;
+ }
+
+ if ((ret = register_jprobe(&dolast_probe)) <0) {
+ printk("register_jprobe failed, returned %u\n", ret);
+ return -1;
+ }
+ fast_probe.kp.addr =
+ (kprobe_opcode_t *) kallsyms_lookup_name("lookup_fast");
+
+ if (!fast_probe.kp.addr) {
+ printk("Couldn't find %s to plant kretprobe\n", "lookup_fast");
+ 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;
+ }
+
+ if ((ret = register_kretprobe(&fast_probe)) <0) {
+ 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);
+
+ 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);
+ return 0;
+}
+
static void add_entry(char *pathname) {
struct path path;
if (kern_path(pathname, 0, &path)) {
}
}
}
+
}
{
unregister_kretprobe(&fast_probe);
unregister_kretprobe(&slow_probe);
- unregister_jprobe(&dolast_probe);
- struct hlist_node *n;
+ unregister_jprobe(&dolast_probe);
struct acl_entry *entry;
int i;
for (i=0;i<HASH_SIZE;i++) {
hlist_for_each_entry_rcu(entry,
- n, &procprotect_hash[i],
- hlist) {
+ &procprotect_hash[i],
+ hlist) {
kfree(entry);
}
}
pathname[count]='\0';
add_entry(pathname);
+
+ if (!once_only) {
+ once_only=1;
+ if (init_probes()==-1)
+ printk(KERN_CRIT "Could not install procprotect probes. Reload module to retry.");
+ }
printk(KERN_CRIT "Length of buffer=%d",strlen(pathname));
return count;
}
+static const struct file_operations procprotect_fops = {
+ .owner = THIS_MODULE,
+ .write = procfile_write
+};
+
+
static int __init procprotect_init(void)
{
int ret;
aclqpath.name = aclpath;
aclqpath.len = strnlen(aclpath, PATH_MAX);
- dolast_probe.kp.addr =
- (kprobe_opcode_t *) kallsyms_lookup_name("do_last");
-
- if (!dolast_probe.kp.addr) {
- printk("Couldn't find %s to plant kretprobe\n", "do_last");
- return -1;
- }
-
- if ((ret = register_jprobe(&dolast_probe)) <0) {
- printk("register_jprobe failed, returned %u\n", ret);
- return -1;
- }
- fast_probe.kp.addr =
- (kprobe_opcode_t *) kallsyms_lookup_name("lookup_fast");
- if (!fast_probe.kp.addr) {
- printk("Couldn't find %s to plant kretprobe\n", "lookup_fast");
- 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;
- }
-
-
-
- if ((ret = register_kretprobe(&fast_probe)) <0) {
- 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);
-
- 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 = proc_create("procprotect", 0644, NULL, &procprotect_fops);
return ret;
}
git://git.onelab.eu / procprotect.git / blobdiff