From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2038040EB89 for ; Wed, 23 Sep 2026 17:38:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790185112; cv=none; b=NcgqbGG5vpVQXciN51QJDuadiOIy56oLLvxMHl42Ggs0F10xPr+MDAozdDStSUitmvGSvzMcLlyZwnlEyTR44tC3LfwM/ysJ9ikQxm2YhivslDZoNks2sl0HE2tHsHUFFCk0uzQ0lapx+cBRMXsZdNiN4zn3nSuVDsqjG60s950= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790185112; c=relaxed/simple; bh=pV+1D5vSrpBEiPdYYCuKzOStJttNKVhJ4dZ4A9bnN/s=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dfIajNG2E5PBtBKVpIBDTVhWpAXKxXkilPOFvDnbn9jzXyEP4bJllTumAQfH36zAXUOSLQM7hG69P5Hogmxmn45Js8xv6j0XHSeTj/YUSRaM7QeaDDsrhhp9gBqJBYBM+LcjtX52yzo08E3daXzUxhbUvs1Oi6IjZcquzqimn0M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=EXpzXTtC; arc=none smtp.client-ip=209.85.214.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="EXpzXTtC" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-2d8facae850so6645ad.0 for ; Wed, 23 Sep 2026 10:38:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1790185110; x=1790789910; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=D1AquzIApwGo2FvNhSKw8uhRmWAtNmW1t7wHGg5rKrs=; b=EXpzXTtCj8ztqUvIft+WiLrzGaKaHL1NXJ0cS8TtZePNF9Wjoe5TiNES6nZ1cLIaCf C4DgJgKP4N3FlFL3ANoU5RWJoWlRmWp5XxHVHSj9uHuoxDaVIeEqAdSWJbAJilENn213 pAtayeMHjOk57biEwRw43UiAbPXw5+vIhA5nAqDdI7zmD0q7qcWHMYrj06LdWuniqhmn ogo4zlPHwAKXXgv9uvSsH2wf3o6iLNTyJDRQt+jPE4+gfnq+omDTjUkqmOVhWhfK2J8Y 4O0adTAXUgpibLcTcqXYlbq5EzoxaLPUmrEd8PQjJ+W9QnnJgUGX2/63VGkn2GlNgT5j hfFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790185110; x=1790789910; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=D1AquzIApwGo2FvNhSKw8uhRmWAtNmW1t7wHGg5rKrs=; b=MWxzjNFgpCK23VDe5SFyx8Rpy2d7+msRGna8LUZxXEPudYafpAs2LRSCZ5jCiQHgs7 tPXyJ5WKaLhrFPtWA5m4SuP+vkzQkR78yKWaikoBg1Kl/jnp9iPw4gKzw0G1ayxWGvmx JX7aPk05Rqy+hztYvsFC4UjwljBrTCYLVxoxLWdVrPiH0jR1TiqBnBwdxoWBXK3+D13C mp4APy3jgEvnLzwkJIFhUNz6MFXSSl8WPHF0cVG9evLunCOg4jNNZo9ejzA8CnaLeTX+ C/xXSWvl0Es03b9BAkLmK+de0ZL7kw0S1rDEx5a/C1ZWnec9Ns06pJQGSz4N3QaXaI2m D5dA== X-Forwarded-Encrypted: i=1; AKwUvBzUT+kOewtAh6alnBdk9aX4TR1FcOQNiKTtRXNa64bezQW6zZgGEUnlIqYjojqhfmy5++GwAuBUbvIRpE0=@vger.kernel.org X-Gm-Message-State: AFuF++mifM/6QU66FLi6LCSwR+RlhRi5KzcDuyqJsD4LeraXTa/UJSMg UlZU2Ggm1IZqRXL51GpTN1p0fHkunFOTnAXYdg7QIQD6CmrQGvW3ojebF7jDmTO6jw== X-Gm-Gg: AYBFou23taR8Q5T8DTQHWNnWeA7KpaqNNJle3eeJ4pBQrsJ0A4F6yiH4o8srNyj9H8Z 9GICSMGU5+eMxJ6ZrvhparQLwGBV6vVMsD6NLOd2UhpsPTFOAnxn8Lkobc4dGGP/zeLhWCPqpLS YPOk6ydXAv1A6GeV/udliMGqN/lEH/pHAGRS8Fh4mJ4ww48CHbc9AV7n54P8x19tW1kpQaIuChU O9cDnz7wuZjX/3TYt+RLqvSf3qnKNOvBhAhkxg4HrlRtHpuv36VhPRpVfL1j/LM6wLmF4Yh6RGB h/LzYb1xUWjdB2P/8hpU2MOTOmg81PQKalrul2Dr3zJe8BLQT5ETQJvITC8RQyRBaq/5srLtV7Y b3ExP2wOiCKSG0M3Q6Rhg2mdp7Ojhd6MbFi9CpTARLHD0pmVoBd1dI1h2yfTCf/gCKWVPU9M+yv dthopWMFhTEjpAISV6YzSV2J1YRVU0NTTkBrNjGCEwuxF25434qQGQ85P299zKiJVgy8jPXHB4M 6rU141eOylFRIXoTbvM6agYrj+F+F/exrWX3ItAv36zycOVVTAgCwtDNA/aGlMpvo49ByKProcZ 9GJgsqEuSBUNv2Q794mikn9o/cUbbI9t1Fqpp/ydTMuGFak= X-Received: by 2002:a17:903:90d:b0:2ca:4bb4:4bd with SMTP id d9443c01a7336-2df7bbd799fmr625835ad.5.1790185109816; Wed, 23 Sep 2026 10:38:29 -0700 (PDT) Received: from google.com (99.95.125.34.bc.googleusercontent.com. [34.125.95.99]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a0974ec5c4sm119346a91.5.2026.09.23.10.38.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Sep 2026 10:38:29 -0700 (PDT) Date: Wed, 23 Sep 2026 17:38:24 +0000 From: Carlos Llamas To: Sagar Taunk Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Miguel Ojeda , Boqun Feng , Gary Guo , =?iso-8859-1?Q?Bj=F6rn?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , Onur =?iso-8859-1?Q?=D6zkan?= , Matthew Maurer , Greg Kroah-Hartman , netdev@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Lunn Subject: Re: [PATCH net-next v4] rust: net: netlink: validate attribute length before casting to `c_int` Message-ID: References: <20260923120504.9100-1-sagartaunk@proton.me> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260923120504.9100-1-sagartaunk@proton.me> On Wed, Sep 23, 2026 at 12:05:17PM +0000, Sagar Taunk wrote: > `put()` trusted an unchecked `as` cast from `usize` to `c_int`. > When the length exceeds `i32::MAX` that cast wraps around to a > negative value. > > This ultimately resulted in a kernel panic when the reinterpreted > value via `__nla_reserve()` and `skb_put()` became enormous. > > Validate payload and header both fit together in a `u16`, rejecting > any payload that wouldn't leave room for `NLA_HDRLEN`. > > Fixes: 5eaa5fbb6e6c ("rust: netlink: add raw netlink abstraction") > Reviewed-by: Alice Ryhl > Signed-off-by: Sagar Taunk > --- LGTM, Reviewed-by: Carlos Llamas