MODULE_VERSION(VERSION_STR);
struct procprotect_ctx {
- struct inode **inode;
- struct qstr *q;
- struct path *path;
- int flags;
+ struct inode **inode;
+ struct qstr *q;
+ struct path *path;
+ int flags;
};
struct acl_entry {
- unsigned int ino;
- struct hlist_node hlist;
+ unsigned int ino;
+ struct hlist_node hlist;
};
#define HASH_SIZE (1<<10)
struct proc_dir_entry *proc_entry;
static int run_acl(unsigned long ino) {
- struct acl_entry *entry;
- hlist_for_each_entry_rcu_notrace(entry,
- &procprotect_hash[ino & (HASH_SIZE-1)],
- hlist) {
- if (entry->ino==ino) {
- return 0;
- }
- }
- return 1;
+ struct acl_entry *entry;
+ hlist_for_each_entry_rcu_notrace(entry,
+ &procprotect_hash[ino & (HASH_SIZE-1)],
+ hlist) {
+ if (entry->ino==ino) {
+ return 0;
+ }
+ }
+ return 1;
}
/*
- Save the first argument, which is in a register, for consideration in the return hook
*/
static int lookup_fast_entry(struct kretprobe_instance *ri, struct pt_regs *regs) {
- int ret = -1;
- struct procprotect_ctx *ctx;
- struct nameidata *nd = (struct nameidata *) regs->di;
- struct dentry *parent;
- struct inode *pinode;
+ int ret = -1;
+ struct procprotect_ctx *ctx;
+ struct nameidata *nd = (struct nameidata *) regs->di;
+ struct dentry *parent;
+ struct inode *pinode;
if (!nd) return ret;
parent = nd->path.dentry;
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 = (struct inode **)regs->dx;
- ctx->flags = nd->flags;
- ret = 0;
- }
+ 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 = (struct inode **)regs->dx;
+ ctx->flags = nd->flags;
+ ret = 0;
+ }
- return ret;
+ return ret;
}
/* The entry hook ensures that the return hook is only called for
static int lookup_fast_ret(struct kretprobe_instance *ri, struct pt_regs *regs)
{
- struct procprotect_ctx *ctx = (struct procprotect_ctx *) ri->data;
- int ret = regs->ax;
-
- if (ret==0) {
- /* The kernel is going to honor the request. Here's where we step in */
- struct inode *inode = *(ctx->inode);
- if (!run_acl(inode->i_ino)) {
- regs->ax = -EPERM;
- }
- }
+ struct procprotect_ctx *ctx = (struct procprotect_ctx *) ri->data;
+ int ret = regs->ax;
+
+ if (ret==0) {
+ /* The kernel is going to honor the request. Here's where we step in */
+ struct inode *inode = *(ctx->inode);
+ if (!run_acl(inode->i_ino)) {
+ regs->ax = -EPERM;
+ }
+ }
- return 0;
+ return 0;
}
static int lookup_slow_entry(struct kretprobe_instance *ri, struct pt_regs *regs) {
- int ret = -1;
- struct procprotect_ctx *ctx;
- struct nameidata *nd = (struct nameidata *) regs->di;
- struct path *p = (struct path *) regs->si;
- struct dentry *parent;
+ int ret = -1;
+ struct procprotect_ctx *ctx;
+ struct nameidata *nd = (struct nameidata *) regs->di;
+ struct path *p = (struct path *) regs->si;
+ struct dentry *parent;
struct inode *pinode;
if (!nd) return ret;
parent = nd->path.dentry;
- if (!parent) return ret;
+ if (!parent) return ret;
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 = &nd->last;
- ctx->flags = nd->flags;
- ctx->path = p;
- ret = 0;
- }
-
- 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->q = &nd->last;
+ ctx->flags = nd->flags;
+ ctx->path = p;
+ ret = 0;
+ }
+
+ return ret;
}
/* The entry hook ensures that the return hook is only called for
static int lookup_slow_ret(struct kretprobe_instance *ri, struct pt_regs *regs)
{
- struct procprotect_ctx *ctx;
- struct inode *inode;
- int ret;
-
- if (!ri || !ri->data) {return 0;}
- ctx = (struct procprotect_ctx *) ri->data;
-
- ret = regs->ax;
-
- if (ret==0) {
- struct path *p = ctx->path;
- if (!p || !p->dentry || !p->dentry->d_inode /* This last check was responsible for the f18 bug*/) {
- return 0;
- }
- inode = p->dentry->d_inode;
- if (!run_acl(inode->i_ino)) {
- regs->ax = -EPERM;
- }
- }
-
- return 0;
+ struct procprotect_ctx *ctx;
+ struct inode *inode;
+ int ret;
+
+ if (!ri || !ri->data) {return 0;}
+ ctx = (struct procprotect_ctx *) ri->data;
+
+ ret = regs->ax;
+
+ if (ret==0) {
+ struct path *p = ctx->path;
+ if (!p || !p->dentry || !p->dentry->d_inode /* This last check was responsible for the f18 bug*/) {
+ return 0;
+ }
+ inode = p->dentry->d_inode;
+ if (!run_acl(inode->i_ino)) {
+ regs->ax = -EPERM;
+ }
+ }
+
+ return 0;
}
struct open_flags {
};
static struct file *do_last_probe(struct nameidata *nd, struct path *path, struct file *file,
- struct open_flags *op, const char *pathname) {
- struct dentry *parent = nd->path.dentry;
- struct inode *pinode = parent->d_inode;
- /*struct qstr *q = &nd->last;*/
-
-
- if (pinode->i_sb->s_magic == PROC_SUPER_MAGIC && current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {
- /*if (!strncmp(q->name,"sysrq-trigger",13)) {
- printk(KERN_CRIT "do_last sysrqtrigger: %d",op->open_flag);
- }*/
- op->open_flag &= ~O_CREAT;
- }
- jprobe_return();
- return file;
+ struct open_flags *op, const char *pathname) {
+ struct dentry *parent = nd->path.dentry;
+ struct inode *pinode = parent->d_inode;
+ /*struct qstr *q = &nd->last;*/
+
+
+ if (pinode->i_sb->s_magic == PROC_SUPER_MAGIC && current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns) {
+ /*if (!strncmp(q->name,"sysrq-trigger",13)) {
+ printk(KERN_CRIT "do_last sysrqtrigger: %d",op->open_flag);
+ }*/
+ op->open_flag &= ~O_CREAT;
+ }
+ jprobe_return();
+ return file;
}
static struct jprobe dolast_probe = {
};
static struct kretprobe fast_probe = {
- .entry_handler = lookup_fast_entry,
- .handler = lookup_fast_ret,
- .maxactive = 20,
- .data_size = sizeof(struct procprotect_ctx)
+ .entry_handler = lookup_fast_entry,
+ .handler = lookup_fast_ret,
+ .maxactive = 20,
+ .data_size = sizeof(struct procprotect_ctx)
};
static struct kretprobe slow_probe = {
- .entry_handler = lookup_slow_entry,
- .handler = lookup_slow_ret,
- .maxactive = 20,
- .data_size = sizeof(struct procprotect_ctx)
+ .entry_handler = lookup_slow_entry,
+ .handler = lookup_slow_ret,
+ .maxactive = 20,
+ .data_size = sizeof(struct procprotect_ctx)
};
int once_only = 0;
}
static void add_entry(char *pathname) {
- struct path path;
- if (kern_path(pathname, 0, &path)) {
- printk(KERN_CRIT "Path lookup failed for %s",pathname);
- }
- else {
- unsigned int ino = path.dentry->d_inode->i_ino;
- struct acl_entry *entry;
- entry = kmalloc(GFP_KERNEL, sizeof(struct acl_entry));
- entry->ino = ino;
-
- if (!entry) {
- printk(KERN_CRIT "Could not allocate memory for %s",pathname);
- }
- else {
- if (run_acl(ino)) {
- hlist_add_head_rcu(&entry->hlist,&procprotect_hash[ino&(HASH_SIZE-1)]);
- printk(KERN_CRIT "Added inode %u",ino);
- }
- else {
- printk(KERN_CRIT "Did not add inode %u, already in list", ino);
- }
- }
- }
+ struct path path;
+ if (kern_path(pathname, 0, &path)) {
+ printk(KERN_CRIT "Path lookup failed for %s",pathname);
+ }
+ else {
+ unsigned int ino = path.dentry->d_inode->i_ino;
+ struct acl_entry *entry;
+ entry = kmalloc(GFP_KERNEL, sizeof(struct acl_entry));
+ entry->ino = ino;
+
+ if (!entry) {
+ printk(KERN_CRIT "Could not allocate memory for %s",pathname);
+ }
+ else {
+ if (run_acl(ino)) {
+ hlist_add_head_rcu(&entry->hlist,&procprotect_hash[ino&(HASH_SIZE-1)]);
+ printk(KERN_CRIT "Added inode %u",ino);
+ }
+ else {
+ printk(KERN_CRIT "Did not add inode %u, already in list", ino);
+ }
+ }
+ }
}
static void __exit procprotect_exit(void)
{
- struct acl_entry *entry;
- int i;
+ struct acl_entry *entry;
+ int i;
- unregister_kretprobe(&fast_probe);
- unregister_kretprobe(&slow_probe);
- unregister_jprobe(&dolast_probe);
+ unregister_kretprobe(&fast_probe);
+ unregister_kretprobe(&slow_probe);
+ unregister_jprobe(&dolast_probe);
- for (i=0;i<HASH_SIZE;i++) {
- hlist_for_each_entry_rcu(entry,
+ for (i=0;i<HASH_SIZE;i++) {
+ hlist_for_each_entry_rcu(entry,
&procprotect_hash[i],
hlist) {
- kfree(entry);
- }
- }
+ kfree(entry);
+ }
+ }
- remove_proc_entry("procprotect",NULL);
- printk("Procprotect: Stopped procprotect.\n");
+ remove_proc_entry("procprotect",NULL);
+ printk("Procprotect: Stopped procprotect.\n");
}
ssize_t procfile_write(struct file *file, const char *buffer, size_t count, loff_t *data) {
- char pathname[PATH_MAX];
+ char *pathname;
+ pathname = (char *) kmalloc(count, GFP_KERNEL);
- if (current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns)
- return -EPERM;
+ if (!pathname) {
+ printk(KERN_CRIT "Could not allocate memory for pathname buffer");
+ return -EFAULT;
+ }
- if (copy_from_user(pathname, buffer, count)) {
- return -EFAULT;
- }
- if (count && (pathname[count-1]==10 || pathname[count-1]==13)) {
- pathname[count-1]='\0';
- }
- else
- pathname[count]='\0';
+ if (current->nsproxy->mnt_ns!=init_task.nsproxy->mnt_ns)
+ return -EPERM;
- add_entry(pathname);
+ if (copy_from_user(pathname, buffer, count)) {
+ return -EFAULT;
+ }
+ if (count && (pathname[count-1]==10 || pathname[count-1]==13)) {
+ pathname[count-1]='\0';
+ }
+ else
+ 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",(int)strlen(pathname));
- return count;
+ printk(KERN_CRIT "Length of buffer=%d",(int)strlen(pathname));
+ kfree(pathname);
+ return count;
}
static const struct file_operations procprotect_fops = {
- .owner = THIS_MODULE,
- .write = procfile_write
+ .owner = THIS_MODULE,
+ .write = procfile_write
};
-
+
static int __init procprotect_init(void)
{
- int ret = 0;
- int i;
+ int ret = 0;
+ int i;
- printk("Procprotect: starting procprotect version %s with ACLs at path %s.\n",
- VERSION_STR, aclpath);
+ printk("Procprotect: starting procprotect version %s with ACLs at path %s.\n",
+ VERSION_STR, aclpath);
- for(i=0;i<HASH_SIZE;i++) {
- INIT_HLIST_HEAD(&procprotect_hash[i]);
- }
+ for(i=0;i<HASH_SIZE;i++) {
+ INIT_HLIST_HEAD(&procprotect_hash[i]);
+ }
- aclqpath.name = aclpath;
- aclqpath.len = strnlen(aclpath, PATH_MAX);
+ aclqpath.name = aclpath;
+ aclqpath.len = strnlen(aclpath, PATH_MAX);
- proc_entry = proc_create("procprotect", 0644, NULL, &procprotect_fops);
+ proc_entry = proc_create("procprotect", 0644, NULL, &procprotect_fops);
- return ret;
+ return ret;
}