From: Pranjal Shrivastava <praan@google.com>
To: Nicolin Chen <nicolinc@nvidia.com>
Cc: jgg@nvidia.com, kevin.tian@intel.com, joro@8bytes.org,
baolu.lu@linux.intel.com, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v1 7/7] iommufd/selftest: Cover invalid read counts on vEVENTQ FD
Date: Wed, 3 Jun 2026 14:46:20 +0000 [thread overview]
Message-ID: <aiA-POwZ8KT2ijUV@google.com> (raw)
In-Reply-To: <7bcd153d306f2cf04c094c728c0ebe146855072a.1780343944.git.nicolinc@nvidia.com>
On Mon, Jun 01, 2026 at 01:42:38PM -0700, Nicolin Chen wrote:
> The vEVENTQ file descriptor must reject reads whose buffer cannot hold
> even one event record. Add selftest coverage that exercises both the
> empty-queue path (the upfront size check) and the non-empty path (the
> in-loop check that fires only after an event is fetched).
>
> For iommufd_veventq_fops_read():
> - count == 0 and count < sizeof(header) on an empty vEVENTQ both
> return -EINVAL.
> - count == 0 and count == sizeof(header) on a non-empty vEVENTQ
> (event has trailing payload) both return -EINVAL.
>
> Assisted-by: Claude:claude-opus-4-7
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Thanks,
Praan
next prev parent reply other threads:[~2026-06-03 14:46 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-01 20:42 [PATCH v1 0/7] iommufd: Fix bugs in eventq fops_read paths Nicolin Chen
2026-06-01 20:42 ` [PATCH v1 1/7] iommufd: Rewind header length in done if iommufd_veventq_fops_read() fails Nicolin Chen
2026-06-03 14:01 ` Pranjal Shrivastava
2026-06-01 20:42 ` [PATCH v1 2/7] iommufd: Reject invalid read count in iommufd_veventq_fops_read() Nicolin Chen
2026-06-03 14:08 ` Pranjal Shrivastava
2026-06-01 20:42 ` [PATCH v1 3/7] iommufd: Propagate allocation failure in iommufd_veventq_deliver_fetch() Nicolin Chen
2026-06-03 14:13 ` Pranjal Shrivastava
2026-06-01 20:42 ` [PATCH v1 4/7] iommufd: Reject invalid read count in iommufd_fault_fops_read() Nicolin Chen
2026-06-03 14:15 ` Pranjal Shrivastava
2026-06-01 20:42 ` [PATCH v1 5/7] iommufd: Break the loop on failure " Nicolin Chen
2026-06-03 14:18 ` Pranjal Shrivastava
2026-06-01 20:42 ` [PATCH v1 6/7] iommufd: Avoid partial fault group delivery " Nicolin Chen
2026-06-03 14:26 ` Pranjal Shrivastava
2026-06-01 20:42 ` [PATCH v1 7/7] iommufd/selftest: Cover invalid read counts on vEVENTQ FD Nicolin Chen
2026-06-03 14:46 ` Pranjal Shrivastava [this message]
2026-06-02 6:27 ` [PATCH v1 0/7] iommufd: Fix bugs in eventq fops_read paths Nicolin Chen
2026-06-03 6:59 ` Tian, Kevin
2026-06-05 14:30 ` Jason Gunthorpe
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