From patchwork Sat Mar 8 01:27:42 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 14007350 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 F3722C282DE for ; Sat, 8 Mar 2025 01:33:00 +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:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=cBW96KST6Pf4TNJJ5Tzze8QKkJZbGh2zcl3Sner2eZs=; b=qqUWvBpu6ywxg/T5dztZZcm80M wmvL2FsCYN/WB9vJRoEdBQHh/4oVaJ4fhMNpnqofG3C3Iq8QMEWcPNxnpZjsTlphH74lw+jCb7fka l7raapTAlWG/9Rtv29WYqPsVRauH/XVfMbHGquXfHce5QTNgK2ISiXeXGhzeIqMN2GvdCFSm9iqMZ kBNJMqyJbDUKng5pAA60Wu96OjgDb6YBMCXs4nBMDiMwjycraR7pBf/lEo2U2mbfQzVXdxDQe+N7q +SCtHJWmQWhjJ0JkWTrD9I/3suYoUAxgAP8nEYKkzag5h9tmx4yxeh3IqED2a6pVWsuMRI3Ve2FyG OCSSGAsw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tqj3c-0000000FzOi-09Wr; Sat, 08 Mar 2025 01:32:52 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tqiyz-0000000FyuB-0fXU for linux-arm-kernel@lists.infradead.org; Sat, 08 Mar 2025 01:28:07 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id A82AA5C5AF8; Sat, 8 Mar 2025 01:25:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E1F8C4CED1; Sat, 8 Mar 2025 01:28:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741397284; bh=2NnoSXHEm3ACxwV47MXYzBIhiGQHif4EsSzrx7xdhk0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jW2XoIfKkxtXbVto+a/zC2ZGd/Fx4k2WSInLuecF4bTBOlI4jAeP+g9JHIhPJBaCQ DhI4gCmwdQmDW5Oe4ko9fi6hsj+np0oUTt6P0WtYvPvUL1ePU/IF6nLezHgjnZTgE5 PbvlJavNGUjkZtjQMZXyLFiu6G9ETBlhisVTDTLJJ77Tipcpoe5Msl8e1HW1/T1+IP xzFtIPMAVhWFgBoAFmbx1pNqbRYotPjrX72ghLU5TxaXUdGYbMRweoas7KlpHE1NsS dM2KzyQl5tF6Py6GJJv+KY3mE4LNij5WsDU3LQdeeJ+eG+e/gWJ4EiDsWffclJ/p6Y Oqv8JwTl07Jcg== From: Song Liu To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-toolchains@vger.kernel.org, live-patching@vger.kernel.org Cc: indu.bhagat@oracle.com, puranjay@kernel.org, wnliu@google.com, irogers@google.com, joe.lawrence@redhat.com, jpoimboe@kernel.org, mark.rutland@arm.com, peterz@infradead.org, roman.gushchin@linux.dev, rostedt@goodmis.org, will@kernel.org, kernel-team@meta.com, song@kernel.org, Suraj Jitindar Singh , Torsten Duwe Subject: [PATCH 2/2] arm64: Implement HAVE_LIVEPATCH Date: Fri, 7 Mar 2025 17:27:42 -0800 Message-ID: <20250308012742.3208215-3-song@kernel.org> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250308012742.3208215-1-song@kernel.org> References: <20250308012742.3208215-1-song@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250307_172805_321289_94109EBE X-CRM114-Status: GOOD ( 12.85 ) 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 This is largely based on [1] by Suraj Jitindar Singh. Test coverage: - Passed manual tests with samples/livepatch. - Passed all but test-kprobe.sh in selftests/livepatch. test-kprobe.sh is expected to fail, because arm64 doesn't have KPROBES_ON_FTRACE. - Passed tests with kpatch-build [2]. (This version includes commits that are not merged to upstream kpatch yet). [1] https://lore.kernel.org/all/20210604235930.603-1-surajjs@amazon.com/ [2] https://github.com/liu-song-6/kpatch/tree/fb-6.13 Cc: Suraj Jitindar Singh Cc: Torsten Duwe Signed-off-by: Song Liu --- arch/arm64/Kconfig | 3 +++ arch/arm64/include/asm/thread_info.h | 4 +++- arch/arm64/kernel/entry-common.c | 4 ++++ 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index ed4f7bf4a879..bc9edba6171a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -276,6 +276,7 @@ config ARM64 select USER_STACKTRACE_SUPPORT select VDSO_GETRANDOM select HAVE_RELIABLE_STACKTRACE + select HAVE_LIVEPATCH help ARM 64-bit (AArch64) Linux support. @@ -2500,3 +2501,5 @@ endmenu # "CPU Power Management" source "drivers/acpi/Kconfig" source "arch/arm64/kvm/Kconfig" + +source "kernel/livepatch/Kconfig" diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index 1114c1c3300a..4ac42e13032b 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -64,6 +64,7 @@ void arch_setup_new_exec(void); #define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */ #define TIF_MTE_ASYNC_FAULT 5 /* MTE Asynchronous Tag Check Fault */ #define TIF_NOTIFY_SIGNAL 6 /* signal notifications exist */ +#define TIF_PATCH_PENDING 7 /* pending live patching update */ #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ #define TIF_SYSCALL_AUDIT 9 /* syscall auditing */ #define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for ftrace */ @@ -92,6 +93,7 @@ void arch_setup_new_exec(void); #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) #define _TIF_SECCOMP (1 << TIF_SECCOMP) #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) +#define _TIF_PATCH_PENDING (1 << TIF_PATCH_PENDING) #define _TIF_UPROBE (1 << TIF_UPROBE) #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) #define _TIF_32BIT (1 << TIF_32BIT) @@ -103,7 +105,7 @@ void arch_setup_new_exec(void); #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \ _TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \ - _TIF_NOTIFY_SIGNAL) + _TIF_NOTIFY_SIGNAL | _TIF_PATCH_PENDING) #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index b260ddc4d3e9..b537af333b42 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -144,6 +145,9 @@ static void do_notify_resume(struct pt_regs *regs, unsigned long thread_flags) (void __user *)NULL, current); } + if (thread_flags & _TIF_PATCH_PENDING) + klp_update_patch_state(current); + if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) do_signal(regs);