Hi everybody, every time I apply a patch to my kernel tree I (or my scripts) make an echo $PATCHNAME $PATCHVERSION >> .patches This patch makes the file accessible via /proc/patches.gz. I think this can be handy if you want to know what patches you (or your distributor) applied to your running kernel... Most of the code is copy & past from CONFIG_IKCONFIG[_PROC]. Let me know what you think. Regards, -- Christian
diff -Nur linux-2.6.12+/include/linux/patches.h linux-2.6.12+-patches/include/linux/patches.h --- linux-2.6.12+/include/linux/patches.h 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.12+-patches/include/linux/patches.h 2005-06-23 23:10:15.278685000 +0200 @@ -0,0 +1,6 @@ +#ifndef _LINUX_PATCHES_H +#define _LINUX_PATCHES_H + +#include <linux/autoconf.h> + +#endif diff -Nur linux-2.6.12+/init/Kconfig linux-2.6.12+-patches/init/Kconfig --- linux-2.6.12+/init/Kconfig 2005-06-23 23:16:40.748685000 +0200 +++ linux-2.6.12+-patches/init/Kconfig 2005-06-23 23:10:16.928685000 +0200 @@ -226,6 +226,25 @@ This option enables access to the kernel configuration file through /proc/config.gz. +config IKPATCHES + bool "Kernel .patches support" + ---help--- + This option enables the complete Linux kernel ".patches" file + contents to be saved in the kernel. It provides documentation + of which kernel patches are applied in a running kernel. This + information can be extracted from the kernel image file with + the script scripts/extract-ikpatches and used as input to + rebuild the current kernel or to build another kernel. + It can also be extracted from a running kernel by reading + /proc/patches.gz if enabled (below). + +config IKPATCHES_PROC + bool "Enable access to .patches through /proc/patches.gz" + depends on IKPATCHES && PROC_FS + ---help--- + This option enables access to the kernel patches file + through /proc/patches.gz. + config CPUSETS bool "Cpuset support" depends on SMP diff -Nur linux-2.6.12+/kernel/Makefile linux-2.6.12+-patches/kernel/Makefile --- linux-2.6.12+/kernel/Makefile 2005-06-23 23:17:13.248685000 +0200 +++ linux-2.6.12+-patches/kernel/Makefile 2005-06-23 23:10:17.218685000 +0200 @@ -21,6 +21,8 @@ obj-$(CONFIG_CPUSETS) += cpuset.o obj-$(CONFIG_IKCONFIG) += configs.o obj-$(CONFIG_IKCONFIG_PROC) += configs.o +obj-$(CONFIG_IKPATCHES) += patches.o +obj-$(CONFIG_IKPATCHES_PROC) += patches.o obj-$(CONFIG_STOP_MACHINE) += stop_machine.o obj-$(CONFIG_AUDIT) += audit.o obj-$(CONFIG_AUDITSYSCALL) += auditsc.o @@ -52,3 +54,17 @@ targets += config_data.h $(obj)/config_data.h: $(obj)/config_data.gz FORCE $(call if_changed,ikconfiggz) + +$(obj)/patches.o: $(obj)/patches_data.h + +# patches_data.h contains the same information as ikpatches.h but gzipped. +# Info from patches_data can be extracted from /proc/patches* +targets += patches_data.gz +$(obj)/patches_data.gz: .patches FORCE + $(call if_changed,gzip) + +quiet_cmd_ikpatchesgz = IKPTC $@ + cmd_ikpatchesgz = (echo "static const char kernel_patches_data[] = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@ +targets += patches_data.h +$(obj)/patches_data.h: $(obj)/patches_data.gz FORCE + $(call if_changed,ikpatchesgz) diff -Nur linux-2.6.12+/kernel/patches.c linux-2.6.12+-patches/kernel/patches.c --- linux-2.6.12+/kernel/patches.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.12+-patches/kernel/patches.c 2005-06-23 23:10:17.608685000 +0200 @@ -0,0 +1,115 @@ +/* + * kernel/patches.c + * Echo the kernel .patches file used to build the kernel + * + * Copyright (C) 2005 Christian Hesse <[email protected]> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/patches.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/init.h> +#include <asm/uaccess.h> + +/**************************************************/ +/* the actual current patchesfile */ + +/* + * Define kernel_patches_data and kernel_patches_data_size, which contains the + * wrapped and compressed patches file. The file is first compressed + * with gzip and then bounded by two eight byte magic numbers to allow + * extraction from a binary kernel image: + * + * IKPTC_ST + * <image> + * IKPTC_ED + */ +#define MAGIC_START "IKPTC_ST" +#define MAGIC_END "IKPTC_ED" +#include "patches_data.h" + + +#define MAGIC_SIZE (sizeof(MAGIC_START) - 1) +#define kernel_patches_data_size \ + (sizeof(kernel_patches_data) - 1 - MAGIC_SIZE * 2) + +#ifdef CONFIG_IKPATCHES_PROC + +/**************************************************/ +/* globals and useful constants */ + +static ssize_t +ikpatches_read_current(struct file *file, char __user *buf, + size_t len, loff_t * offset) +{ + loff_t pos = *offset; + ssize_t count; + + if (pos >= kernel_patches_data_size) + return 0; + + count = min(len, (size_t)(kernel_patches_data_size - pos)); + if (copy_to_user(buf, kernel_patches_data + MAGIC_SIZE + pos, count)) + return -EFAULT; + + *offset += count; + return count; +} + +static struct file_operations ikpatches_file_ops = { + .owner = THIS_MODULE, + .read = ikpatches_read_current, +}; + +/***************************************************/ +/* ikpatches_init: start up everything we need to */ + +static int __init ikpatches_init(void) +{ + struct proc_dir_entry *entry; + + /* create the current patches file */ + entry = create_proc_entry("patches.gz", S_IFREG | S_IRUGO, + &proc_root); + if (!entry) + return -ENOMEM; + + entry->proc_fops = &ikpatches_file_ops; + entry->size = kernel_patches_data_size; + + return 0; +} + +/***************************************************/ +/* ikpatches_cleanup: clean up our mess */ + +static void __exit ikpatches_cleanup(void) +{ + remove_proc_entry("patches.gz", &proc_root); +} + +module_init(ikpatches_init); +module_exit(ikpatches_cleanup); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Christian Hesse"); +MODULE_DESCRIPTION("Echo the kernel .patch file that lists applied patches"); + +#endif /* CONFIG_IKPATCHES_PROC */
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