linux-kernel - [PATCH v3 2/2] samples: rust: convert PCI rust sample driver to use try_access

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250406-try_with-v3-2-c0947842e768@nvidia.com>
Date: Sun, 06 Apr 2025 22:58:16 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Danilo Krummrich <dakr@...nel.org>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <benno.lossin@...ton.me>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pci@...r.kernel.org, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v3 2/2] samples: rust: convert PCI rust sample driver to
 use try_access_with()

This method limits the scope of the revocable guard and is considered
safer to use for most cases, so let's showcase it here.

Acked-by: Danilo Krummrich <dakr@...nel.org>
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 samples/rust/rust_driver_pci.rs | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/samples/rust/rust_driver_pci.rs b/samples/rust/rust_driver_pci.rs
index 1fb6e44f33951c521c8b086a7a3a012af911cf26..f2cb1c220bce42d161cf48664e8a5dd19770ba97 100644
--- a/samples/rust/rust_driver_pci.rs
+++ b/samples/rust/rust_driver_pci.rs
@@ -83,13 +83,12 @@ fn probe(pdev: &mut pci::Device, info: &Self::IdInfo) -> Result<Pin<KBox<Self>>>
             GFP_KERNEL,
         )?;
 
-        let bar = drvdata.bar.try_access().ok_or(ENXIO)?;
+        let res = drvdata
+            .bar
+            .try_access_with(|b| Self::testdev(info, b))
+            .ok_or(ENXIO)??;
 
-        dev_info!(
-            pdev.as_ref(),
-            "pci-testdev data-match count: {}\n",
-            Self::testdev(info, &bar)?
-        );
+        dev_info!(pdev.as_ref(), "pci-testdev data-match count: {}\n", res);
 
         Ok(drvdata.into())
     }

-- 
2.49.0