From patchwork Fri May 10 21:02:41 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 1098335 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=joelfernandes.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=joelfernandes.org header.i=@joelfernandes.org header.b="qN8XmFJF"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 4512jp08SMz9sBK for ; Sat, 11 May 2019 07:03:10 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728027AbfEJVDB (ORCPT ); Fri, 10 May 2019 17:03:01 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:35327 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727997AbfEJVDA (ORCPT ); Fri, 10 May 2019 17:03:00 -0400 Received: by mail-pg1-f195.google.com with SMTP id h1so3572739pgs.2 for ; Fri, 10 May 2019 14:02:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelfernandes.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=8oE2WIx1FMypb1Aghhf1J5CK0/OilbjCc9zGNHOFdrY=; b=qN8XmFJFg5CeG6nmVQBnY66XpOcCTdEO7rgJEGlUdYfvFd1rdTD6Hc1QvGQ1xQFgD3 jr4b1FDKbfY/ead3bXxaplHHnpjColKhiPlaPIQJ8No6u3SRWNeJumjv5vqejgm/8Dr8 sTVk+VErpT2tq96XJhiGZXfYfkTEbiKn2Rdtc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=8oE2WIx1FMypb1Aghhf1J5CK0/OilbjCc9zGNHOFdrY=; b=PiM8gIcDnC6HTDlYCEmxoOyBg9iKaVRf1lqAe1bV+BzzY6Qou/XMOn30i+/dmklyXQ 5gYlOIVLHkY7ANw0pmY0Eo4z29FlV4mkklmelcaXxdh26KnO1Jt2yq3t1ur8slp/HJK6 hX97QeZGopZskBaMpuPOQ7S/dv2ExkZdx5fXgWx56dNEfiTv1HSqO8dZyQ1S9iDvFEw4 EBD5Zpqze/rrR2vDzVPugadhSnkk45HbU27hF3uR5vwg0NVf0cWaXzqxPwU6uPsvUKhN mDnJUkbbXiWPKfFDAFOzKQC5+n6pxL1Y/tR5WhXdtHWQ4eXleRlN2V9SimU2PZapKGnt X/1w== X-Gm-Message-State: APjAAAWEoaYhWGOsZcwlLE7Wq6cHYeuFroGlDR6NrHaMG6UEcGvzzGPp JIK1aRvlv8qk1i5xl/snyfWX2g== X-Google-Smtp-Source: APXvYqxSrzMIb0Y/+XoYVGH5E/Cc0vsqm+l72M1XDf8wH+gWz5Rpbnd4eYcgbpbP8LC12DDrKlYEEQ== X-Received: by 2002:a62:1ec5:: with SMTP id e188mr17316804pfe.242.1557522179252; Fri, 10 May 2019 14:02:59 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id y8sm6523333pgk.20.2019.05.10.14.02.54 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 10 May 2019 14:02:57 -0700 (PDT) From: "Joel Fernandes (Google)" To: linux-kernel@vger.kernel.org Cc: "Joel Fernandes (Google)" , Steven Rostedt , Adrian Ratiu , Alexei Starovoitov , Andrew Morton , atishp04@gmail.com, bpf@vger.kernel.org, Brendan Gregg , Brendan Gregg , dancol@google.com, Daniel Borkmann , Dan Williams , dietmar.eggemann@arm.com, duyuchao , gregkh@linuxfoundation.org, Guenter Roeck , Jonathan Corbet , Karim Yaghmour , Kees Cook , kernel-team@android.com, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-devel@vger.kernel.org, Manjo Raja Rao , Masahiro Yamada , Masami Hiramatsu , =?utf-8?q?Micha=C5=82_Gregorc?= =?utf-8?q?zyk?= , Michal Gregorczyk , Mohammad Husain , Olof Johansson , qais.yousef@arm.com, rdunlap@infradead.org, Shuah Khan , Srinivas Ramana , Tamir Carmeli , yhs@fb.com Subject: [PATCH 1/3] kheaders: Move from proc to sysfs Date: Fri, 10 May 2019 17:02:41 -0400 Message-Id: <20190510210243.152808-2-joel@joelfernandes.org> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog In-Reply-To: <20190510210243.152808-1-joel@joelfernandes.org> References: <20190510210243.152808-1-joel@joelfernandes.org> MIME-Version: 1.0 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-Id: netdev.vger.kernel.org The kheaders archive consisting of the kernel headers used for compiling bpf programs is in /proc. However there is concern that moving it here will make it permanent. Let us move it to /sys/kernel as discussed [1]. [1] https://lore.kernel.org/patchwork/patch/1067310/#1265969 Suggested-by: Steven Rostedt Acked-by: Steven Rostedt Signed-off-by: Joel Fernandes (Google) --- Changes to this patch since initial posting: Fixed sysfs file mode nit (Greg). Fixed some kconfig nits (Masami). init/Kconfig | 16 ++++----- kernel/Makefile | 4 +-- kernel/{gen_ikh_data.sh => gen_kheaders.sh} | 2 +- kernel/kheaders.c | 40 +++++++++------------ 4 files changed, 26 insertions(+), 36 deletions(-) rename kernel/{gen_ikh_data.sh => gen_kheaders.sh} (98%) diff --git a/init/Kconfig b/init/Kconfig index 82b84e5ee30d..ce08adf0f637 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -579,15 +579,13 @@ config IKCONFIG_PROC This option enables access to the kernel configuration file through /proc/config.gz. -config IKHEADERS_PROC - tristate "Enable kernel header artifacts through /proc/kheaders.tar.xz" - depends on PROC_FS - help - This option enables access to the kernel header and other artifacts that - are generated during the build process. These can be used to build eBPF - tracing programs, or similar programs. If you build the headers as a - module, a module called kheaders.ko is built which can be loaded on-demand - to get access to the headers. +config IKHEADERS + tristate "Enable kernel headers through /sys/kernel/kheaders.tar.xz" + help + This option enables access to the in-kernel headers that are generated during + the build process. These can be used to build eBPF tracing programs, + or similar programs. If you build the headers as a module, a module called + kheaders.ko is built which can be loaded on-demand to get access to headers. config LOG_BUF_SHIFT int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" diff --git a/kernel/Makefile b/kernel/Makefile index 298437bb2c6a..60e3057c780e 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -71,7 +71,7 @@ obj-$(CONFIG_UTS_NS) += utsname.o obj-$(CONFIG_USER_NS) += user_namespace.o obj-$(CONFIG_PID_NS) += pid_namespace.o obj-$(CONFIG_IKCONFIG) += configs.o -obj-$(CONFIG_IKHEADERS_PROC) += kheaders.o +obj-$(CONFIG_IKHEADERS) += kheaders.o obj-$(CONFIG_SMP) += stop_machine.o obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o obj-$(CONFIG_AUDIT) += audit.o auditfilter.o @@ -127,7 +127,7 @@ $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE $(obj)/kheaders.o: $(obj)/kheaders_data.tar.xz quiet_cmd_genikh = CHK $(obj)/kheaders_data.tar.xz -cmd_genikh = $(srctree)/kernel/gen_ikh_data.sh $@ +cmd_genikh = $(srctree)/kernel/gen_kheaders.sh $@ $(obj)/kheaders_data.tar.xz: FORCE $(call cmd,genikh) diff --git a/kernel/gen_ikh_data.sh b/kernel/gen_kheaders.sh similarity index 98% rename from kernel/gen_ikh_data.sh rename to kernel/gen_kheaders.sh index 591a94f7b387..581b83534587 100755 --- a/kernel/gen_ikh_data.sh +++ b/kernel/gen_kheaders.sh @@ -2,7 +2,7 @@ # SPDX-License-Identifier: GPL-2.0 # This script generates an archive consisting of kernel headers -# for CONFIG_IKHEADERS_PROC. +# for CONFIG_IKHEADERS. set -e spath="$(dirname "$(readlink -f "$0")")" kroot="$spath/.." diff --git a/kernel/kheaders.c b/kernel/kheaders.c index 70ae6052920d..8f69772af77b 100644 --- a/kernel/kheaders.c +++ b/kernel/kheaders.c @@ -8,9 +8,8 @@ #include #include -#include +#include #include -#include /* * Define kernel_headers_data and kernel_headers_data_end, within which the @@ -31,39 +30,32 @@ extern char kernel_headers_data; extern char kernel_headers_data_end; static ssize_t -ikheaders_read_current(struct file *file, char __user *buf, - size_t len, loff_t *offset) +ikheaders_read(struct file *file, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t len) { - return simple_read_from_buffer(buf, len, offset, - &kernel_headers_data, - &kernel_headers_data_end - - &kernel_headers_data); + memcpy(buf, &kernel_headers_data + off, len); + return len; } -static const struct file_operations ikheaders_file_ops = { - .read = ikheaders_read_current, - .llseek = default_llseek, +static struct bin_attribute kheaders_attr __ro_after_init = { + .attr = { + .name = "kheaders.tar.xz", + .mode = 0444, + }, + .read = &ikheaders_read, }; static int __init ikheaders_init(void) { - struct proc_dir_entry *entry; - - /* create the current headers file */ - entry = proc_create("kheaders.tar.xz", S_IRUGO, NULL, - &ikheaders_file_ops); - if (!entry) - return -ENOMEM; - - proc_set_size(entry, - &kernel_headers_data_end - - &kernel_headers_data); - return 0; + kheaders_attr.size = (&kernel_headers_data_end - + &kernel_headers_data); + return sysfs_create_bin_file(kernel_kobj, &kheaders_attr); } static void __exit ikheaders_cleanup(void) { - remove_proc_entry("kheaders.tar.xz", NULL); + sysfs_remove_bin_file(kernel_kobj, &kheaders_attr); } module_init(ikheaders_init); From patchwork Fri May 10 21:02:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 1098336 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=joelfernandes.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; 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Fri, 10 May 2019 14:03:02 -0700 (PDT) From: "Joel Fernandes (Google)" To: linux-kernel@vger.kernel.org Cc: "Joel Fernandes (Google)" , Linus Torvalds , Adrian Ratiu , Alexei Starovoitov , Andrew Morton , atishp04@gmail.com, bpf@vger.kernel.org, Brendan Gregg , Brendan Gregg , dancol@google.com, Daniel Borkmann , Dan Williams , dietmar.eggemann@arm.com, duyuchao , gregkh@linuxfoundation.org, Guenter Roeck , Jonathan Corbet , Karim Yaghmour , Kees Cook , kernel-team@android.com, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-devel@vger.kernel.org, Manjo Raja Rao , Masahiro Yamada , Masami Hiramatsu , =?utf-8?q?Micha=C5=82_Gregorc?= =?utf-8?q?zyk?= , Michal Gregorczyk , Mohammad Husain , Olof Johansson , qais.yousef@arm.com, rdunlap@infradead.org, rostedt@goodmis.org, Shuah Khan , Srinivas Ramana , Tamir Carmeli , yhs@fb.com Subject: [PATCH 2/3] kheaders: Do not regenerate archive if config is not changed Date: Fri, 10 May 2019 17:02:42 -0400 Message-Id: <20190510210243.152808-3-joel@joelfernandes.org> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog In-Reply-To: <20190510210243.152808-1-joel@joelfernandes.org> References: <20190510210243.152808-1-joel@joelfernandes.org> MIME-Version: 1.0 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-Id: netdev.vger.kernel.org Linus reported an issue that doing an allmodconfig was causing the kheaders archive to be regenerated even though the config is the same. This patch fixes the issue by ignoring the config-related header files for "knowing when to regenerate based on timestamps". Instead, if the CONFIG_X_Y option really changes, then we there are the include/config/X/Y.h which will already tells us "if a config really changed". So we don't really need these files for regeneration detection anyway, and ignoring them fixes Linus's issue. Reported-by: Linus Torvalds Signed-off-by: Joel Fernandes (Google) --- kernel/gen_kheaders.sh | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh index 581b83534587..9a34e1d9bd7f 100755 --- a/kernel/gen_kheaders.sh +++ b/kernel/gen_kheaders.sh @@ -31,9 +31,8 @@ arch/$SRCARCH/include/ # This block is useful for debugging the incremental builds. # Uncomment it for debugging. -# iter=1 -# if [ ! -f /tmp/iter ]; then echo 1 > /tmp/iter; -# else; iter=$(($(cat /tmp/iter) + 1)); fi +# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter; +# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi # find $src_file_list -type f | xargs ls -lR > /tmp/src-ls-$iter # find $obj_file_list -type f | xargs ls -lR > /tmp/obj-ls-$iter @@ -43,10 +42,18 @@ arch/$SRCARCH/include/ pushd $kroot > /dev/null src_files_md5="$(find $src_file_list -type f | grep -v "include/generated/compile.h" | + grep -v "include/generated/autoconf.h" | + grep -v "include/config/auto.conf" | + grep -v "include/config/auto.conf.cmd" | + grep -v "include/config/tristate.conf" | xargs ls -lR | md5sum | cut -d ' ' -f1)" popd > /dev/null obj_files_md5="$(find $obj_file_list -type f | grep -v "include/generated/compile.h" | + grep -v "include/generated/autoconf.h" | + grep -v "include/config/auto.conf" | + grep -v "include/config/auto.conf.cmd" | + grep -v "include/config/tristate.conf" | xargs ls -lR | md5sum | cut -d ' ' -f1)" if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi @@ -82,7 +89,7 @@ find $cpio_dir -type f -print0 | tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null -echo "$src_files_md5" > kernel/kheaders.md5 +echo "$src_files_md5" > kernel/kheaders.md5 echo "$obj_files_md5" >> kernel/kheaders.md5 echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 From patchwork Fri May 10 21:02:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 1098337 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=joelfernandes.org Authentication-Results: ozlabs.org; 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Fri, 10 May 2019 14:03:06 -0700 (PDT) From: "Joel Fernandes (Google)" To: linux-kernel@vger.kernel.org Cc: "Joel Fernandes (Google)" , Masahiro Yamada , Adrian Ratiu , Alexei Starovoitov , Andrew Morton , atishp04@gmail.com, bpf@vger.kernel.org, Brendan Gregg , Brendan Gregg , dancol@google.com, Daniel Borkmann , Dan Williams , dietmar.eggemann@arm.com, duyuchao , gregkh@linuxfoundation.org, Guenter Roeck , Jonathan Corbet , Karim Yaghmour , Kees Cook , kernel-team@android.com, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-devel@vger.kernel.org, Manjo Raja Rao , Masami Hiramatsu , =?utf-8?q?Micha=C5=82_Gregorczyk?= , Michal Gregorczyk , Mohammad Husain , Olof Johansson , qais.yousef@arm.com, rdunlap@infradead.org, rostedt@goodmis.org, Shuah Khan , Srinivas Ramana , Tamir Carmeli , yhs@fb.com Subject: [PATCH 3/3] kheaders: Make it depend on sysfs Date: Fri, 10 May 2019 17:02:43 -0400 Message-Id: <20190510210243.152808-4-joel@joelfernandes.org> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog In-Reply-To: <20190510210243.152808-1-joel@joelfernandes.org> References: <20190510210243.152808-1-joel@joelfernandes.org> MIME-Version: 1.0 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-Id: netdev.vger.kernel.org The kheaders archive is exposed through SYSFS in /sys/kernel/. Make it depend on SYSFS as it makes no sense to enable this feature without it. Suggested-by: Masahiro Yamada Signed-off-by: Joel Fernandes (Google) --- init/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/init/Kconfig b/init/Kconfig index ce08adf0f637..f27138a8cf28 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -581,6 +581,7 @@ config IKCONFIG_PROC config IKHEADERS tristate "Enable kernel headers through /sys/kernel/kheaders.tar.xz" + depends on SYSFS help This option enables access to the in-kernel headers that are generated during the build process. These can be used to build eBPF tracing programs,