From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D3B07214A71; Wed, 19 Mar 2025 21:38:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742420309; cv=none; b=AJvsagZr68dp4Znv302g6iV1mNFVgXDETeRVy8s1Nf2b/60hgKlEW+1uAh2vR7OOLbdbqlyPaEuGjqnDrUxS5tnTk93soSQDlb+8jTWUzbQ1KqrMa12E83MPPXezUhlcet9vELkHLOIlCIqu0XNyIERCPUktdwg0a87D1FGxtIQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742420309; c=relaxed/simple; bh=FwNROOBiRQdLC4LMY0dNrjEMqI1FlzLJowVkMOHTQnk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Yr7RfQG7Vv2+5g9TAx+9Qq+DywLSECLMUfncZLh5sAVEn51cVLDp8N7gdBOmSOcLL6SStLZufr0UpbAb2Uq6CSKGXvkfT1dk/cJCcA20y7BbMYLFYhf3QUYTmVm1v30KdwtguoJ1JfwkdBXvGI7WhgrfUN6j1ld2g+DMTm23G7Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XTzRGgYg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XTzRGgYg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB78CC4CEE4; Wed, 19 Mar 2025 21:38:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1742420309; bh=FwNROOBiRQdLC4LMY0dNrjEMqI1FlzLJowVkMOHTQnk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XTzRGgYgUiM7dDAuU0PP/o/gxpWPk5nrU+ZcqlHgsz+v+XhA8Ul8QPhPN6JhlnZ9j am/lMjA0Ckj/odltOGkGav5L28oqNWF0DEVA8CmnGuUrUEA8G68GAvFHL1pep11xgB g1CDS6xvYGBN+KivygRYRr5+YgBsuWDX57mevLtXFQXA6R5+42vo+shrhO0HvJly3G /Oukcx+7KhM2haG6oCR1xPfrrSmSLc7kjC2MpvyYwgQczDnOFFBIosYJqsOGmT9yOu OZS8nub6nbGdm5HuoX8E4Vpt1mZ4u74hTdQUs+7rCDeXGOtC1DGZ9k/H7A63Aje/nT ZDTyVfVUQE50A== 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 v2 2/2] arm64: Implement HAVE_LIVEPATCH Date: Wed, 19 Mar 2025 14:37:07 -0700 Message-ID: <20250319213707.1784775-3-song@kernel.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250319213707.1784775-1-song@kernel.org> References: <20250319213707.1784775-1-song@kernel.org> Precedence: bulk X-Mailing-List: linux-toolchains@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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); -- 2.47.1