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Date: Sat, 18 Feb 2012 21:56:26 +0100 From: Marcin Slusarz <marcin.slusarz@...il.com> To: Kees Cook <keescook@...omium.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, Randy Dunlap <rdunlap@...otime.net>, Alexander Viro <viro@...iv.linux.org.uk>, Ingo Molnar <mingo@...e.hu>, linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org, kernel-hardening@...ts.openwall.com Subject: Re: [PATCH] fs: hardlink creation restrictions 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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