Messages in this thread | | | Date | Sat, 18 Feb 2012 21:56:26 +0100 | From | Marcin Slusarz <> | Subject | Re: [PATCH] fs: hardlink creation restrictions |
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On Sat, Feb 18, 2012 at 11:38:57AM -0800, Kees Cook wrote: > @@ -3052,6 +3119,9 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname, > error = mnt_want_write(new_path.mnt); > if (error) > goto out_dput; > + error = may_linkat(&old_path); > + if (error) > + goto out_dput; > error = security_path_link(old_path.dentry, &new_path, new_dentry); > if (error) > goto out_drop_write;
You should give up write access after check failure (i.e. goto out_drop_write).
Marcin
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