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Thomas Orgis" , Yiyang Chen Subject: [PATCH 0/2] taskstats: fix cgroupstats invalid fd handling and add selftests Date: Sat, 11 Jul 2026 04:07:35 +0800 Message-ID: X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series fixes an issue where cgroupstats mishandles invalid file descriptors, and introduces a functional kselftest to prevent regressions. When an invalid file descriptor is passed via CGROUPSTATS_CMD_ATTR_FD, cgroupstats_user_cmd() returns 0 instead of an error code. This leads to two broken behaviors depending on netlink flags: - Callers without NLM_F_ACK block indefinitely on recv(). - Callers with NLM_F_ACK receive a misleading success ACK (errno == 0) but no actual statistics payload. The first patch addresses this by returning -EBADF when the fd cannot be resolved. The second patch adds a comprehensive kselftest covering both the valid cgroup v1 query and the invalid fd paths (with and without NLM_F_ACK) to ensure the fixes work as intended. Yiyang Chen (2): taskstats: return -EBADF when cgroupstats receives an invalid fd selftests/acct: add cgroupstats functional test kernel/taskstats.c | 2 +- tools/testing/selftests/acct/Makefile | 1 + tools/testing/selftests/acct/cgroupstats.c | 354 +++++++++++++++++++++ 3 files changed, 356 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/acct/cgroupstats.c -- 2.43.0