From nobody Wed Feb 11 06:30:15 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C81C81DEFE0; Thu, 9 Oct 2025 15:24:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760023460; cv=none; b=RmOdRA8KUDSWD4DVMZLJNEGR3oFyiIG5o2Xsqq33qzRsSlndjR6W81l1YURrSW8KDNQT/ntIxH3icN6hvu2zRXl8C+DJxJO30xlI1zNM/ql6klaknTU6GpalAk5RwulWZLf/cu9HqIWC18tPXuySyfy2mD9sECMuwVGT0acErjs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760023460; c=relaxed/simple; bh=ydc3U0Yxoi93G2YKlPO0EC9UcDZ0KIdY56hZeXd0Pm8=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=Zg+OL+wapOMLK+UZdYRuyxAVR+o4DbXrBJrWMsY7ShjyDHIVkXs88rlBBBMSWyxvaDE8f9KNGxijIl5V4P3wSFun76A+5QNo65UDUHFXdFhenfWmS5Nw7GjgAZP3G1Uc4wLk8avcRjB8z08KhIQGxSBWM+DdZoeWM9DiE7xdXaA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WMFh8OGG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WMFh8OGG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91496C116C6; Thu, 9 Oct 2025 15:24:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760023460; bh=ydc3U0Yxoi93G2YKlPO0EC9UcDZ0KIdY56hZeXd0Pm8=; h=Date:From:To:Cc:Subject:References:From; b=WMFh8OGGUggIzabxpoKbQFcnLhNsmC0vG/4SnYl+6nO2GPNU3VEJUI7m/N+1tw7iS unw0AyNh+yFJtwV55IkUYFe6NDGBZj4iFepGWSh16THayRTd2kN4yUSRX/IQIv+Jeq //PMr6Ls4j3OJU1TvFfo5U26Yya+vx5S63vD6vvKV39fzBaG2BUltDRwvadjPplIeC DyBX+LuU6qdHrz+APaSso+ZoiQDAMVLVbdYBcdOiaZnCgax1b5fUTX+AAstIJdxIOv Wlgb+DUnj/36uzb29a4rLIjhpMCxk9hGBJw+EFsEvG5Dj5N6+H9t+CmmiI8JOX9aS9 hYHVYD0z2sIOQ== Received: from rostedt by gandalf with local (Exim 4.98.2) (envelope-from ) id 1v6sVB-00000000Bdy-0xdD; Thu, 09 Oct 2025 11:24:21 -0400 Message-ID: <20251009152421.086241586@kernel.org> User-Agent: quilt/0.68 Date: Thu, 09 Oct 2025 11:24:03 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , stable@vger.kernel.org, syzbot+ddc001b92c083dbf2b97@syzkaller.appspotmail.com, Ankit Khushwaha Subject: [for-linus][PATCH 4/5] ring buffer: Propagate __rb_map_vma return value to caller References: <20251009152359.604267051@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ankit Khushwaha The return value from `__rb_map_vma()`, which rejects writable or executable mappings (VM_WRITE, VM_EXEC, or !VM_MAYSHARE), was being ignored. As a result the caller of `__rb_map_vma` always returned 0 even when the mapping had actually failed, allowing it to proceed with an invalid VMA. Cc: stable@vger.kernel.org Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Link: https://lore.kernel.org/20251008172516.20697-1-ankitkhushwaha.linux@g= mail.com Fixes: 117c39200d9d7 ("ring-buffer: Introducing ring-buffer mapping functio= ns") Reported-by: syzbot+ddc001b92c083dbf2b97@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?id=3D194151be8eaebd826005329b2e12= 3aecae714bdb Signed-off-by: Ankit Khushwaha Signed-off-by: Steven Rostedt (Google) --- kernel/trace/ring_buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 43460949ad3f..1244d2c5c384 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -7273,7 +7273,7 @@ int ring_buffer_map(struct trace_buffer *buffer, int = cpu, atomic_dec(&cpu_buffer->resize_disabled); } =20 - return 0; + return err; } =20 int ring_buffer_unmap(struct trace_buffer *buffer, int cpu) --=20 2.51.0