From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D439C41378E; Tue, 15 Sep 2026 11:31:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789471913; cv=none; b=jPx2c7aG83EtRZD0JgLG3o0mzyO4QGfrXfkddFIW48BQkKzieui1BlxoyF25QWAhmmfP3x1w8naK6DD418Yc3JMAqLcNjqfIGV1bakd2/JV9dt7zXizJ7UpbtozT2WKugIO5vLIFj54FA0NxII3WS2e/jowUc3mG7iOHkerPE8A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789471913; c=relaxed/simple; bh=evSE6cJdnuFzZXNcFgM0f0Wtj2vW8xSJVidsgxr0vnY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=oI5648ohhLCkrWFyN8WI/LoIQckza2bDTFPH5vsKCXBoN476tgXrHDJYmD7KXe1hOzGJJMpeZ3YYomH87aA8qNMMwXrM7bYeFMfR+0lIoEy+iwbqXeWF59QuJF6iupknSVyvX5Kp9DzC5Ce3Oy+0mWn3X63R/FvZH7+NFsvLmh8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NjTiEaV3; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NjTiEaV3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 44BA31F00893; Tue, 15 Sep 2026 11:31:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789471911; bh=FOANy+Z4EJ+6nqoqN6kMNeWMX83pxCR/f2oFPELw6+I=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=NjTiEaV3ZaSoS1ZK+2F2vFiHjAl7mkp0G3MbSEUlep66TuNm80zD11hu1nBRrXxYn jBTgv2BJxRFDL61U3EX8wu6faVIGU3bVeFZLIy90XxwIrdrOUrOsKYX977rOTgZ/8I 4thUe5a8WqKasgzR8NxRqDgxbn2ffdmAsbyPzlk/nLtbznCt3T36AhEWcTJxWAK16P +oX6GAj1A666bKWBCHBVyXFcgtj42qkim8vnDO1heVDCubdQ6sDhUxhnwBvgcIFp3b tNoelVNVV3FSdtQiheYIa3QaDhiMkmI4KN1O3BjQkmw4KGESv+pMI5iwydQ3oXYyV8 m6gLuAfE4lcLg== From: Christian Brauner Date: Tue, 15 Sep 2026 13:30:50 +0200 Subject: [PATCH RFC POC 04/50] ARC: commit fds on syscall exit Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260915-work-fd-reserve-unify-folded-v1-4-4d5217d6b246@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=2822; i=brauner@kernel.org; h=from:subject:message-id; bh=evSE6cJdnuFzZXNcFgM0f0Wtj2vW8xSJVidsgxr0vnY=; b=kA0DAAoWkcYbwGV43KIByyZiAGqpLHyhtTAYRmbLzGwRwqcyv1G19KV/PkIkpZzswA8hR9xFL oh1BAAWCgAdFiEEQIc0Vx6nDHizMmkokcYbwGV43KIFAmqpLHwACgkQkcYbwGV43KJF2gD/fYHy 46GYN1jNxZvG5+E3C415n+5O5q2AJF3BkQjO7yQA/1hW7xKAHZiI3T6na5l1kqSbVvDkaRah45d KjuZmRA8O X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Add TIF_FD_SLOTS and test it on the untraced return from a system call. A task that reserved descriptors takes the tracesys_exit path, where syscall_trace_exit() commits them before the ptrace exit stop. The traced path already ends up there. Signed-off-by: Christian Brauner (Amutable) --- arch/arc/include/asm/thread_info.h | 2 ++ arch/arc/kernel/entry.S | 5 +++++ arch/arc/kernel/ptrace.c | 4 ++++ 3 files changed, 11 insertions(+) diff --git a/arch/arc/include/asm/thread_info.h b/arch/arc/include/asm/thread_info.h index 255d2c774219..4c67d4eb434b 100644 --- a/arch/arc/include/asm/thread_info.h +++ b/arch/arc/include/asm/thread_info.h @@ -77,6 +77,7 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void) #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ +#define TIF_FD_SLOTS 6 /* syscall prepared descriptors */ #define TIF_SYSCALL_TRACE 15 /* syscall trace active */ /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 16 @@ -88,6 +89,7 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void) #define _TIF_NEED_RESCHED (1< #include #include #include @@ -355,6 +356,9 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs) asmlinkage void syscall_trace_exit(struct pt_regs *regs) { + if (test_thread_flag(TIF_FD_SLOTS)) + fd_slots_commit(regs); + if (test_thread_flag(TIF_SYSCALL_TRACE)) ptrace_report_syscall_exit(regs, 0); -- 2.53.0