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new helper: readlink_copy()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2014-03-14 13:42:45 -04:00
parent 4efcc9ffcd
commit 5d826c847b
5 changed files with 12 additions and 47 deletions
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fs/proc/namespaces.c
+4 -10
View File
@@ -146,7 +146,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
struct task_struct *task;
void *ns;
char name[50];
int len = -EACCES;
int res = -EACCES;
task = get_proc_task(inode);
if (!task)
@@ -155,24 +155,18 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
if (!ptrace_may_access(task, PTRACE_MODE_READ))
goto out_put_task;
len = -ENOENT;
res = -ENOENT;
ns = ns_ops->get(task);
if (!ns)
goto out_put_task;
snprintf(name, sizeof(name), "%s:[%u]", ns_ops->name, ns_ops->inum(ns));
len = strlen(name);
if (len > buflen)
len = buflen;
if (copy_to_user(buffer, name, len))
len = -EFAULT;
res = readlink_copy(buffer, buflen, name);
ns_ops->put(ns);
out_put_task:
put_task_struct(task);
out:
return len;
return res;
}
static const struct inode_operations proc_ns_link_inode_operations = {
fs/proc/self.c
+1 -1
View File
@@ -16,7 +16,7 @@ static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
if (!tgid)
return -ENOENT;
sprintf(tmp, "%d", tgid);
return vfs_readlink(dentry,buffer,buflen,tmp);
return readlink_copy(buffer, buflen, tmp);
}
static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)