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 D89664A3872; Tue, 15 Sep 2026 11:33:40 +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=1789472024; cv=none; b=iUJj9vYha3hUnwNAtUeMYsv6M5sOo4Dk5j3XvOx6utao/rXg52rDrmfsbRfYxR25/ovaKrlVMdujRSQTIEisEmro8jTZncym9axBiND0OiscBUaxRufLRToKGqGpEMGZ1RFll82ubpNofKyfn7lNt2AZ0Pag6Gn//2G+etHxWTo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789472024; c=relaxed/simple; bh=Ob3PjpQ/cxpLv/3i+RPAC4oxtU+7SyXGKknKtjIi6uA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=KcxEGl+Hg7pK3/wHrjD/Q5sJtYT6KOf6Hi+c68CyNt1jKIX1Gr5Nir+miASiV89u4IrEsQy8dYl3Fgl88AJxlNyD4nfZ6Gq2tts9q7ylRVNaVnrvKSXlwliq5kLaMKx04qeuEMCSzUz7lJXoqsjzUqagyIshxd459B6m9R4eItI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=m6JS+1os; 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="m6JS+1os" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A06C1F000FF; Tue, 15 Sep 2026 11:33:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789472018; bh=Opabrir2qKnajEOx/bmqQ0vFOOuJF5mcXpUx8QfYgRo=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=m6JS+1osV+HHQ3+stbRMi1nG57ukYiJTEcH35bNEsuFkz3EDpaPqRCxptR5myI3CQ DrVL3ticaSsEmHs4hzrQOkVHuI+pRvmExpm7hSTVT1Fy4ahKbV0yxhDmvASrd6aMLO kfyvZnG8hPY/OSMfxVk2m1KEfL0A4tlDKieBNoYaPaJt6kinrooutLXDgSWdlzJaI4 Qyu0CqnjMLHGESZU0vH6Xh9zHueNHEtLJB7dyoK2455umDXJ25s2IeNCaoYNiPSyj5 BtthgxR3vTZnXL/kG06SW2wMzb3uuLV+YqWCArv2R8bMdgvjWU+Ck1onWTajB/my7G f4cwtNsAzJb3g== From: Christian Brauner Date: Tue, 15 Sep 2026 13:31:04 +0200 Subject: [PATCH RFC POC 18/50] xtensa: commit fds on syscall exit 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: 7bit Message-Id: <20260915-work-fd-reserve-unify-folded-v1-18-4d5217d6b246@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=2590; i=brauner@kernel.org; h=from:subject:message-id; bh=Ob3PjpQ/cxpLv/3i+RPAC4oxtU+7SyXGKknKtjIi6uA=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWSt1Km1PCQWPOf+dN42p7eiixMDrC8oHl3XfDxb8HXeu Q8v17M86ShlYRDjYpAVU2RxaDcJl1vOU7HZKFMDZg4rE8gQBi5OAZiIlRQjwxxl+ehP3JqHnz5Z rnHMf3GFlcCby16MDPn/pqho/776ZA8jwwxuu0Z35YDFs7a2ZE2t16lXXVd42bXR6lPXzm5Ltrk 6jAA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Add TIF_FD_SLOTS and test it once the system call has stored its return value. A task that reserved descriptors uses the traced path. Signed-off-by: Christian Brauner (Amutable) --- arch/xtensa/include/asm/thread_info.h | 2 ++ arch/xtensa/kernel/entry.S | 5 +++++ arch/xtensa/kernel/ptrace.c | 4 ++++ 3 files changed, 11 insertions(+) diff --git a/arch/xtensa/include/asm/thread_info.h b/arch/xtensa/include/asm/thread_info.h index 5b74dfc35ef9..0c8eb5dc8398 100644 --- a/arch/xtensa/include/asm/thread_info.h +++ b/arch/xtensa/include/asm/thread_info.h @@ -124,6 +124,7 @@ static __always_inline struct thread_info *current_thread_info(void) #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ #define TIF_SECCOMP 10 /* secure computing */ #define TIF_MEMDIE 11 /* is terminating due to OOM killer */ +#define TIF_FD_SLOTS 12 /* syscall prepared descriptors */ #define _TIF_SYSCALL_TRACE (1<areg[2] = return_value */ s32i abi_rv, abi_saved0, PT_AREG2 + + /* descriptors reserved by the syscall are committed in do_syscall_trace_leave */ + GET_THREAD_INFO(a4, a1) + l32i a4, a4, TI_FLAGS + bbsi.l a4, TIF_FD_SLOTS, 1f bnez abi_saved1, 1f .Lsyscall_exit: #if defined(__XTENSA_WINDOWED_ABI__) diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c index 364e4fdabb00..d44d62a56b85 100644 --- a/arch/xtensa/kernel/ptrace.c +++ b/arch/xtensa/kernel/ptrace.c @@ -13,6 +13,7 @@ */ #include +#include #include #include #include @@ -571,6 +572,9 @@ void do_syscall_trace_leave(struct pt_regs *regs) { int step; + if (test_thread_flag(TIF_FD_SLOTS)) + fd_slots_commit(regs); + audit_syscall_exit(regs); if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) -- 2.53.0