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Tue, 14 Apr 2026 16:58:47 -0700 (PDT) Received: from [192.168.10.11] ([182.181.137.32]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43ead3d5f11sm115535f8f.18.2026.04.14.16.58.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Apr 2026 16:58:46 -0700 (PDT) From: Ali Raza Subject: [PATCH 0/3] linux-user: Filter /proc/*/task/ and validate tkill targets Date: Wed, 15 Apr 2026 04:58:33 +0500 Message-Id: <20260415-master-v1-0-8dd2ef111eee@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAKnU3mkC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDE0NT3dzE4pLUIl3jRIO0RKPUpDSjFFMloOKCotS0zAqwQdGxEH5xaVJ WanIJSLdSbS0AYRMj6GoAAAA= X-Change-ID: 20260415-master-3a0fa2ebf2d5 To: qemu-devel@nongnu.org Cc: Ali Raza , morgan@kernel.org X-Mailer: b4 0.15.2 Received-SPF: pass client-ip=2a00:1450:4864:20::329; envelope-from=elirazamumtaz@gmail.com; helo=mail-wm1-x329.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Wed, 15 Apr 2026 00:07:55 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This series fixes a problem where QEMU user-mode exposes internal host threads (RCU, TCG workers) to guest processes via /proc/*/task/ and allows the guest to signal them via tkill/tgkill. Patch 1: Filters getdents/getdents64 on /proc//task/ Patch 2: Validates tkill/tgkill targets against guest CPU list Patch 3: Adds a multiarch test exercising both fixes Signed-off-by: Ali Raza --- Ali Raza (3): linux-user: Filter /proc/*/task/ to hide QEMU-internal threads linux-user: Validate tkill/tgkill targets are guest threads tests/tcg: Add test for /proc/self/task/ filtering and tkill validation linux-user/syscall.c | 114 +++++++++++++++++- tests/tcg/multiarch/Makefile.target | 2 + tests/tcg/multiarch/linux/linux-proc-task.c | 178 ++++++++++++++++++++++++++++ 3 files changed, 292 insertions(+), 2 deletions(-) --- base-commit: da6c4fe60fee30dd77267764d55b38af9cb89d4b change-id: 20260415-master-3a0fa2ebf2d5 Best regards, -- Ali Raza