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From: Pranjal Shrivastava <praan@google.com>
To: Zhenzhong Duan <zhenzhong.duan@intel.com>
Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
	jgg@ziepe.ca, kevin.tian@intel.com, joro@8bytes.org,
	will@kernel.org, robin.murphy@arm.com, baolu.lu@linux.intel.com,
	stable@vger.kernel.org
Subject: Re: [PATCH] iommufd: Fix return value of iommufd_fault_fops_write()
Date: Mon, 30 Mar 2026 09:38:49 +0000	[thread overview]
Message-ID: <acpEqc61YLOwrgzm@google.com> (raw)
In-Reply-To: <20260330030755.12856-1-zhenzhong.duan@intel.com>

On Sun, Mar 29, 2026 at 11:07:55PM -0400, Zhenzhong Duan wrote:
> copy_from_user() may return number of bytes failed to copy, we should
> not pass over this number to user space to cheat that write() succeed.
> Instead, -EFAULT should be returned.
> 
> Cc: stable@vger.kernel.org
> Fixes: 07838f7fd529 ("iommufd: Add iommufd fault object")
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>

Reviewed-by: Pranjal Shrivastava <praan@google.com>

Thanks,
Praan

  parent reply	other threads:[~2026-03-30  9:38 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-30  3:07 [PATCH] iommufd: Fix return value of iommufd_fault_fops_write() Zhenzhong Duan
2026-03-30  6:27 ` Shuai Xue
2026-03-30  9:38 ` Pranjal Shrivastava [this message]
2026-03-31  7:46 ` Tian, Kevin
2026-03-31 16:25 ` Jason Gunthorpe

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