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[2a03:2880:30ff:1::face:b00c]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9ee0a4a9b1sm874787166b.52.2024.11.13.07.11.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Nov 2024 07:11:14 -0800 (PST) From: Breno Leitao Date: Wed, 13 Nov 2024 07:10:52 -0800 Subject: [PATCH net-next 1/4] netconsole: Ensure dynamic_netconsole_mutex is held during userdata update 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="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241113-netcon_cpu-v1-1-d187bf7c0321@debian.org> References: <20241113-netcon_cpu-v1-0-d187bf7c0321@debian.org> In-Reply-To: <20241113-netcon_cpu-v1-0-d187bf7c0321@debian.org> To: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Jonathan Corbet , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Breno Leitao , max@kutsevol.com, thepacketgeek@gmail.com, vlad.wing@gmail.com, davej@codemonkey.org.uk X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1125; i=leitao@debian.org; h=from:subject:message-id; bh=dvK97ikucZCA3mi0xw8qgSct+K0NNsxtWtBJbaBwBso=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnNMGNNLZFDm5UODb/yliTCrMzkzzRmOblnI0ne zFE3eQ7QcOJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZzTBjQAKCRA1o5Of/Hh3 bSeoD/0YXmv/scg2QQ7OU0VAUCNpnLD08+t+xQ+IwTqsxUH5H7gj3wnukCQejaaFu2TAqNJtBPa lhRyMnRHZu9X2hjVHFhWZHWR4FibG2ADkEoyqxHyPJjeTn1MKVk1bB2fuvPRMsziosdB2TSpEbX S1dE1jemAtmpYBZpACpBgoEeET3C0iS7Qk3M8UxLF1pfSiGT2VXUJtqmW0a+WAWkfoDROFyj4qH ub0ZOaI/ILV2Ky7sl+W6DGwFTxxOERWin+Swjr9HI7vP8/lURJem0gGh5fVBIn5XlW3jop3jCaD IQLZ6wOjDBOjV39gX7reqazNlO9MXM2HyewTrchP4U/JCR/VT5tEi5x/CNhv759kirLFegZgB7Q us4gi94MbIkNY6oBzP+91Sza0IKxBDa9fUmWTd95ZM6uiBZBuSsYHFDrm+KF1iOpUR4uJO+TuKP XGYRm6/walO11gdJXudCyEw6edw4m/iCWoIReKA4WzfpF0AhGC4/oeSl6GueuW5evtrJi8GzomV LesQHUEWlnX71Of55gEjUz5HPZxcSVS6Bg8hbl6bNvb7siStQwdIOcV8psffyRV5hYPn57u7IIe GtnWvXi/kcyyahFAI0Xrb7yIESUldlNi9OuhD9FpE57NNanK8lNoT1aN8Jpf3uByY9zkBG2D1H0 FGht4XCW5YRXwcg== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D Add a lock assertion to verify that dynamic_netconsole_mutex is held when updating the userdata fields in the netconsole driver. This change prevents calling update_userdata() without holding the lock, ensuring data consistency and integrity. The update_userdata() function is invoked only when the user changes the configuration, so this addition does not impact performance as it is not in the hot path. Signed-off-by: Breno Leitao --- drivers/net/netconsole.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 4ea44a2f48f7b1f9059d275f0f0edc40cc1997f0..965712d65a014c60f91bf35e48f= 1b112f66b8439 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -697,6 +697,8 @@ static void update_userdata(struct netconsole_target *n= t) int complete_idx =3D 0, child_count =3D 0; struct list_head *entry; =20 + lockdep_assert_held(&dynamic_netconsole_mutex); + /* Clear the current string in case the last userdatum was deleted */ nt->userdata_length =3D 0; nt->userdata_complete[0] =3D 0; --=20 2.43.5