From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C22E0C982C3 for ; Tue, 15 Sep 2026 11:33:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=LsNpEFA01NMLmoDGH+WQ2k5w2caYKI3aFXCKnW6fq4M=; b=wjXABLAPkwH2zxN0ltx3yHMRLC Hl5xfMEepauZUWjc9o6qIyudhArlPmxLGBi7kM+SzuFuuLtQYsN5sTVu2X7FP2W+q7U6rPxw6yrBJ iYvViOndLNUw15nDrx5RRtiE87GlHNQF+9sPDTXnUsLX0hWQcxRYneq85nAykM30q4P/HK8spy8+q xCOEAq6Zk72+eDGR5sibRBk0ndQe3s1IHr7om212UXKzM/qHq/3ufuvhAfVqDX34p+PHkLI9g9YmY xR0TQ3IN0ET3zYKfP3NIaVoUZUwmR8K0MQ1ejSzGwXMJjHzE31nxLR0bTmjckrS4DHWCm3J7pNsZe uz7Eco6A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6RQ1-000000069jH-2Slb; Tue, 15 Sep 2026 11:33:45 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6RPn-000000069OE-25QI; Tue, 15 Sep 2026 11:33:35 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 432C0437CE; Tue, 15 Sep 2026 11:33:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E8D71F00898; Tue, 15 Sep 2026 11:33:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789472011; bh=LsNpEFA01NMLmoDGH+WQ2k5w2caYKI3aFXCKnW6fq4M=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=jUmSavNiamqp7sEiSGUpt1XZfKBJkPkcG/PFCGuuE8ULC/JC+9Uv/jivWwgpx6a/O ndFuFYQRnEyeD6+NTxQCHA1WQfYk7Jmw39axkxPneZ0ZlWHflWnPtQntegHAjSQOHr qvPuy2KIMTAU8QpGMIZajMcBNJZLx1KDydcGwu/7Fq4Sm2suht1GMp/5OShBghjByJ Wo0vc/D/MORpmKTNOKDNlY4+TTriFUPTu4Y02yC+j0UyASaEIruvlKlSwBV+MXdIZL vi9GUupn2o56nWtYus7diY/kBIvVMBlvyHSKLH2hV7NTFX1VBgWRv0lAAGJXCHoiGT eaCHwlU6HAvXg== From: Christian Brauner Date: Tue, 15 Sep 2026 13:31:03 +0200 Subject: [PATCH RFC POC 17/50] um: commit fds on syscall exit MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260915-work-fd-reserve-unify-folded-v1-17-4d5217d6b246@kernel.org> References: <20260915-work-fd-reserve-unify-folded-v1-0-4d5217d6b246@kernel.org> In-Reply-To: <20260915-work-fd-reserve-unify-folded-v1-0-4d5217d6b246@kernel.org> To: Linus Torvalds Cc: Alexander Viro , Jann Horn , Jan Kara , Ingo Molnar , Peter Zijlstra , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Oleg Nesterov , linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, Jens Axboe , io-uring@vger.kernel.org, netdev@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-gpio@vger.kernel.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, bpf@vger.kernel.org, David Airlie , virtualization@lists.linux.dev, kvm@vger.kernel.org, kexec@lists.infradead.org, linux-hyperv@vger.kernel.org, "Christian Brauner (Amutable)" X-Mailer: b4 0.17-dev-db0b7 X-Developer-Signature: v=1; a=openpgp-sha256; l=1865; i=brauner@kernel.org; h=from:subject:message-id; bh=S9sXo+/yQO9aORTIGU5zP9aw99mbVPSatnA1JIW5H/M=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWSt1KldP/NzGWPyQ7vZ1w8Z91Y4Xry4dOW/w5ekHD1Nn i1f3lHo1FHKwiDGxSArpsji0G4SLrecp2KzUaYGzBxWJpAhDFycAjCRnzMY/tdevWsc17Pol1js drW1Ndl3Uj4rJ6jNqM1Qvbkzdcr/kFkM//PT/U4ukVght9Iz6NLyeqmVG29b1dz/x+3x4GR56M6 Uan4A X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add TIF_FD_SLOTS. handle_syscall() calls syscall_trace_leave() after every system call, so test the flag there and commit the reservations before audit and the ptrace exit stop. Signed-off-by: Christian Brauner (Amutable) --- arch/um/include/asm/thread_info.h | 2 ++ arch/um/kernel/ptrace.c | 4 ++++ 2 files changed, 6 insertions(+) diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h index 7a6f4dc99fa1..7140516ee0b6 100644 --- a/arch/um/include/asm/thread_info.h +++ b/arch/um/include/asm/thread_info.h @@ -44,6 +44,7 @@ struct thread_info { #define TIF_SECCOMP 9 /* secure computing */ #define TIF_SINGLESTEP 10 /* single stepping userspace */ #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ +#define TIF_FD_SLOTS 12 /* syscall prepared descriptors */ #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) @@ -55,6 +56,7 @@ struct thread_info { #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SECCOMP (1 << TIF_SECCOMP) #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) +#define _TIF_FD_SLOTS (1 << TIF_FD_SLOTS) #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \ _TIF_NOTIFY_RESUME) diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c index 7da0a5223aa6..f1f89181fb7e 100644 --- a/arch/um/kernel/ptrace.c +++ b/arch/um/kernel/ptrace.c @@ -4,6 +4,7 @@ */ #include +#include #include #include #include @@ -142,6 +143,9 @@ void syscall_trace_leave(struct pt_regs *regs) { int ptraced = current->ptrace; + if (test_thread_flag(TIF_FD_SLOTS)) + fd_slots_commit(regs); + audit_syscall_exit(regs); /* Fake a debug trap */ -- 2.53.0