Hi,
while getting familiar with OpenBSD, I've noticed a utility called systrace
(http://www.citi.umich.edu/u/provos/systrace/, http://www.systrace.org/). This
application can alter behavior of syscalls on a simple rules basis; it can
operate on various backends and systems: it's native in OpenBSD and NetBSD, it
has generic ptrace backend (yes, I know that's not really safe) and it has a
Linux kernel patch.
The latest Linux kernel patch I've found was for 2.6.13.4; I've found no mention
of systrace whatsoever when searching through LKML, so I've decided to try my
best and upgrade it to 2.6.19.
Please see the attached patch; it basically only fixes of what didn't apply
clean with the old patch. It's been vaguely tested and it appears to work
as expected.
As I'm not the author, nor do I understand exactly the internals, I'd merely
like to ask someone to look at it, comment it, perhaps even fix it; in the most
optimistic thoughts, maintain it.
My thought on the patch is that linux_sysent.c could be replaced by something
way cleaner. Also, I'm not entirely certain whether it should be in drivers/
instead of security/. Last but definitely not least, only x86 asm code is
available, so it'd have to be ported to other architectures as well.
Thanks in advance for any reply.
PS.: Please, CC me, I'm off-list.
PPS.: To build systrace userland application to use the Linux kernel backend,
ensure that the configure script has access to systrace header files.
diff -ruN linux-2.6.19-vanilla/arch/i386/kernel/entry.S linux-2.6.19/arch/i386/kernel/entry.S
--- linux-2.6.19-vanilla/arch/i386/kernel/entry.S 2006-11-29 22:57:37.000000000 +0100
+++ linux-2.6.19/arch/i386/kernel/entry.S 2006-12-09 18:53:27.000000000 +0100
@@ -330,8 +330,23 @@
jnz syscall_trace_entry
cmpl $(nr_syscalls), %eax
jae syscall_badsys
+#ifdef CONFIG_SYSTRACE
+ movl %esp,%eax
+ call systrace_intercept
+ cmpl $0,%eax
+ jl ret1
+ movl ORIG_EAX(%esp),%eax
+#endif /* CONFIG_SYSTRACE */
call *sys_call_table(,%eax,4)
+#ifdef CONFIG_SYSTRACE
+ ret1:
+#endif /* CONFIG_SYSTRACE */
movl %eax,EAX(%esp)
+#ifdef CONFIG_SYSTRACE
+ movl %esp,%eax # pass in stack
+ call systrace_result
+ movl EAX(%esp),%eax # XXX: ?to be on the safe side
+#endif /* CONFIG_SYSTRACE */
DISABLE_INTERRUPTS
TRACE_IRQS_OFF
movl TI_flags(%ebp), %ecx
@@ -363,9 +378,25 @@
jnz syscall_trace_entry
cmpl $(nr_syscalls), %eax
jae syscall_badsys
+#ifdef CONFIG_SYSTRACE
+ movl %esp,%eax
+ call systrace_intercept
+ cmpl $0,%eax
+ jl ret
+ movl ORIG_EAX(%esp),%eax
+#endif /* CONFIG_SYSTRACE */
syscall_call:
call *sys_call_table(,%eax,4)
+#ifdef CONFIG_SYSTRACE
+ ret:
+#endif /* CONFIG_SYSTRACE */
movl %eax,EAX(%esp) # store the return value
+#ifdef CONFIG_SYSTRACE
+ movl %esp,%eax # pass in stack
+ call systrace_result
+ movl EAX(%esp),%eax # XXX: ?to be on the safe side
+#endif /* CONFIG_SYSTRACE */
+
syscall_exit:
DISABLE_INTERRUPTS # make sure we don't miss an interrupt
# setting need_resched or sigpending
diff -ruN linux-2.6.19-vanilla/drivers/Makefile linux-2.6.19/drivers/Makefile
--- linux-2.6.19-vanilla/drivers/Makefile 2006-11-29 22:57:37.000000000 +0100
+++ linux-2.6.19/drivers/Makefile 2006-12-07 18:27:10.000000000 +0100
@@ -67,6 +67,7 @@
obj-$(CONFIG_MCA) += mca/
obj-$(CONFIG_EISA) += eisa/
obj-$(CONFIG_CPU_FREQ) += cpufreq/
+obj-$(CONFIG_SYSTRACE) += systrace/
obj-$(CONFIG_MMC) += mmc/
obj-$(CONFIG_NEW_LEDS) += leds/
obj-$(CONFIG_INFINIBAND) += infiniband/
diff -ruN linux-2.6.19-vanilla/drivers/systrace/Kconfig linux-2.6.19/drivers/systrace/Kconfig
--- linux-2.6.19-vanilla/drivers/systrace/Kconfig 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19/drivers/systrace/Kconfig 2006-12-07 18:55:36.000000000 +0100
@@ -0,0 +1,7 @@
+config SYSTRACE
+ bool "Systrace support"
+ help
+ This enables systrace support. See http://www.systrace.org/ for details.
+
+ Also enable Default Linux Capabilites (CONFIG_SECURITY_CAPABILITIES)!
+
diff -ruN linux-2.6.19-vanilla/drivers/systrace/linux_sysent.c linux-2.6.19/drivers/systrace/linux_sysent.c
--- linux-2.6.19-vanilla/drivers/systrace/linux_sysent.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19/drivers/systrace/linux_sysent.c 2006-12-07 18:55:36.000000000 +0100
@@ -0,0 +1,296 @@
+/*
+ * file taken from openbsd's compat/linux/linux_sysent.c
+ */
+
+/* $OpenBSD: linux_sysent.c,v 1.36 2002/06/05 19:43:44 jasoni Exp $ */
+
+
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/fs.h>
+#include <linux/wait.h>
+#include <linux/queue.h>
+
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/semaphore.h>
+
+#include <linux/systrace.h>
+
+/* #define s(type) sizeof(type) */
+#define s(type) 0
+
+struct sysent linux_sysent[] = {
+ { 0, 0 }, /* 0 = syscall */
+ { 1, s(struct sys_exit_args) }, /* 1 = exit */
+ { 0, 0 }, /* 2 = fork */
+ { 3, s(struct sys_read_args) }, /* 3 = read */
+ { 3, s(struct sys_write_args) }, /* 4 = write */
+ { 3, s(struct linux_sys_open_args) }, /* 5 = open */
+ { 1, s(struct sys_close_args) }, /* 6 = close */
+ { 3, s(struct linux_sys_waitpid_args) }, /* 7 = waitpid */
+ { 2, s(struct linux_sys_creat_args) }, /* 8 = creat */
+ { 2, s(struct sys_link_args) }, /* 9 = link */
+ { 1, s(struct linux_sys_unlink_args) }, /* 10 = unlink */
+ { 3, s(struct linux_sys_execve_args) }, /* 11 = execve */
+ { 1, s(struct linux_sys_chdir_args) }, /* 12 = chdir */
+ { 1, s(struct linux_sys_time_args) }, /* 13 = time */
+ { 3, s(struct linux_sys_mknod_args) }, /* 14 = mknod */
+ { 2, s(struct linux_sys_chmod_args) }, /* 15 = chmod */
+ { 3, s(struct linux_sys_lchown16_args) }, /* 16 = lchown16 */
+ { 1, s(struct linux_sys_break_args) }, /* 17 = break */
+ { 0, 0 }, /* 18 = ostat */
+ { 3, s(struct compat_43_sys_lseek_args) }, /* 19 = lseek */
+ { 0, 0 }, /* 20 = getpid */
+ { 5, s(struct linux_sys_mount_args) }, /* 21 = mount */
+ { 1, s(struct linux_sys_umount_args) }, /* 22 = umount */
+ { 1, s(struct sys_setuid_args) }, /* 23 = linux_setuid16 */
+ { 0, 0 }, /* 24 = linux_getuid16 */
+ { 1, s(struct linux_sys_stime_args) }, /* 25 = stime */
+ { 0, 0 }, /* 26 = unimplemented ptrace */
+ { 1, s(struct linux_sys_alarm_args) }, /* 27 = alarm */
+ { 0, 0 }, /* 28 = ofstat */
+ { 0, 0 }, /* 29 = pause */
+ { 2, s(struct linux_sys_utime_args) }, /* 30 = utime */
+ { 0, 0 }, /* 31 = stty */
+ { 0, 0 }, /* 32 = gtty */
+ { 2, s(struct linux_sys_access_args) }, /* 33 = access */
+ { 1, s(struct linux_sys_nice_args) }, /* 34 = nice */
+ { 0, 0 }, /* 35 = ftime */
+ { 0, 0 }, /* 36 = sync */
+ { 2, s(struct linux_sys_kill_args) }, /* 37 = kill */
+ { 2, s(struct linux_sys_rename_args) }, /* 38 = rename */
+ { 2, s(struct linux_sys_mkdir_args) }, /* 39 = mkdir */
+ { 1, s(struct linux_sys_rmdir_args) }, /* 40 = rmdir */
+ { 1, s(struct sys_dup_args) }, /* 41 = dup */
+ { 1, s(struct linux_sys_pipe_args) }, /* 42 = pipe */
+ { 1, s(struct linux_sys_times_args) }, /* 43 = times */
+ { 0, 0 }, /* 44 = prof */
+ { 1, s(struct linux_sys_brk_args) }, /* 45 = brk */
+ { 1, s(struct sys_setgid_args) }, /* 46 = linux_setgid16 */
+ { 0, 0 }, /* 47 = linux_getgid16 */
+ { 2, s(struct linux_sys_signal_args) }, /* 48 = signal */
+ { 0, 0 }, /* 49 = linux_geteuid16 */
+ { 0, 0 }, /* 50 = linux_getegid16 */
+ { 1, s(struct sys_acct_args) }, /* 51 = acct */
+ { 0, 0 }, /* 52 = phys */
+ { 0, 0 }, /* 53 = lock */
+ { 3, s(struct linux_sys_ioctl_args) }, /* 54 = ioctl */
+ { 3, s(struct linux_sys_fcntl_args) }, /* 55 = fcntl */
+ { 0, 0 }, /* 56 = mpx */
+ { 2, s(struct sys_setpgid_args) }, /* 57 = setpgid */
+ { 0, 0 }, /* 58 = ulimit */
+ { 1, s(struct linux_sys_oldolduname_args) }, /* 59 = oldolduname */
+ { 1, s(struct sys_umask_args) }, /* 60 = umask */
+ { 1, s(struct sys_chroot_args) }, /* 61 = chroot */
+ { 0, 0 }, /* 62 = ustat */
+ { 2, s(struct sys_dup2_args) }, /* 63 = dup2 */
+ { 0, 0 }, /* 64 = getppid */
+ { 0, 0 }, /* 65 = getpgrp */
+ { 0, 0 }, /* 66 = setsid */
+ { 3, s(struct linux_sys_sigaction_args) }, /* 67 = sigaction */
+ { 0, 0 }, /* 68 = siggetmask */
+ { 1, s(struct linux_sys_sigsetmask_args) }, /* 69 = sigsetmask */
+ { 2, s(struct linux_sys_setreuid16_args) }, /* 70 = setreuid16 */
+ { 2, s(struct linux_sys_setregid16_args) }, /* 71 = setregid16 */
+ { 3, s(struct linux_sys_sigsuspend_args) }, /* 72 = sigsuspend */
+ { 1, s(struct linux_sys_sigpending_args) }, /* 73 = sigpending */
+ { 2, s(struct compat_43_sys_sethostname_args) }, /* 74 = sethostname */
+ { 2, s(struct linux_sys_setrlimit_args) }, /* 75 = setrlimit */
+ { 2, s(struct linux_sys_getrlimit_args) }, /* 76 = getrlimit */
+ { 2, s(struct sys_getrusage_args) }, /* 77 = getrusage */
+ { 2, s(struct sys_gettimeofday_args) }, /* 78 = gettimeofday */
+ { 2, s(struct sys_settimeofday_args) }, /* 79 = settimeofday */
+ { 2, s(struct sys_getgroups_args) }, /* 80 = linux_getgroups */
+ { 2, s(struct sys_setgroups_args) }, /* 81 = linux_setgroups */
+ { 1, s(struct linux_sys_oldselect_args) }, /* 82 = oldselect */
+ { 2, s(struct linux_sys_symlink_args) }, /* 83 = symlink */
+ { 2, s(struct compat_43_sys_lstat_args) }, /* 84 = olstat */
+ { 3, s(struct linux_sys_readlink_args) }, /* 85 = readlink */
+ { 1, s(struct linux_sys_uselib_args) }, /* 86 = uselib */
+ { 1, s(struct sys_swapon_args) }, /* 87 = swapon */
+ { 1, s(struct sys_reboot_args) }, /* 88 = reboot */
+ { 3, s(struct linux_sys_readdir_args) }, /* 89 = readdir */
+ { 1, s(struct linux_sys_mmap_args) }, /* 90 = mmap */
+ { 2, s(struct sys_munmap_args) }, /* 91 = munmap */
+ { 2, s(struct linux_sys_truncate_args) }, /* 92 = truncate */
+ { 2, s(struct compat_43_sys_ftruncate_args) }, /* 93 = ftruncate */
+ { 2, s(struct sys_fchmod_args) }, /* 94 = fchmod */
+ { 3, s(struct linux_sys_fchown16_args) }, /* 95 = fchown16 */
+ { 2, s(struct sys_getpriority_args) }, /* 96 = getpriority */
+ { 3, s(struct sys_setpriority_args) }, /* 97 = setpriority */
+ { 4, s(struct sys_profil_args) }, /* 98 = profil */
+ { 2, s(struct linux_sys_statfs_args) }, /* 99 = statfs */
+ { 2, s(struct linux_sys_fstatfs_args) }, /* 100 = fstatfs */
+#ifdef __i386__
+ { 3, s(struct linux_sys_ioperm_args) }, /* 101 = ioperm */
+#else
+ { 0, 0 }, /* 101 = ioperm */
+#endif
+ { 2, s(struct linux_sys_socketcall_args) }, /* 102 = socketcall */
+ { 0, 0 }, /* 103 = klog */
+ { 3, s(struct sys_setitimer_args) }, /* 104 = setitimer */
+ { 2, s(struct sys_getitimer_args) }, /* 105 = getitimer */
+ { 2, s(struct linux_sys_stat_args) }, /* 106 = stat */
+ { 2, s(struct linux_sys_lstat_args) }, /* 107 = lstat */
+ { 2, s(struct linux_sys_fstat_args) }, /* 108 = fstat */
+ { 1, s(struct linux_sys_olduname_args) }, /* 109 = olduname */
+#ifdef __i386__
+ { 1, s(struct linux_sys_iopl_args) }, /* 110 = iopl */
+#else
+ { 0, 0 }, /* 110 = iopl */
+#endif
+ { 0, 0 }, /* 111 = vhangup */
+ { 0, 0 }, /* 112 = idle */
+ { 0, 0 }, /* 113 = vm86old */
+ { 4, s(struct linux_sys_wait4_args) }, /* 114 = wait4 */
+ { 0, 0 }, /* 115 = swapoff */
+ { 0, 0 }, /* 116 = sysinfo */
+ { 5, s(struct linux_sys_ipc_args) }, /* 117 = ipc */
+ { 1, s(struct sys_fsync_args) }, /* 118 = fsync */
+ { 1, s(struct linux_sys_sigreturn_args) }, /* 119 = sigreturn */
+ { 2, s(struct linux_sys_clone_args) }, /* 120 = clone */
+ { 2, s(struct compat_09_sys_setdomainname_args) }, /* 121 = setdomainname */
+ { 1, s(struct linux_sys_uname_args) }, /* 122 = uname */
+#ifdef __i386__
+ { 3, s(struct linux_sys_modify_ldt_args) }, /* 123 = modify_ldt */
+#else
+ { 0, 0 }, /* 123 = modify_ldt */
+#endif
+ { 0, 0 }, /* 124 = adjtimex */
+ { 3, s(struct sys_mprotect_args) }, /* 125 = mprotect */
+ { 3, s(struct linux_sys_sigprocmask_args) }, /* 126 = sigprocmask */
+ { 0, 0 }, /* 127 = create_module */
+ { 0, 0 }, /* 128 = init_module */
+ { 0, 0 }, /* 129 = delete_module */
+ { 0, 0 }, /* 130 = get_kernel_syms */
+ { 0, 0 }, /* 131 = quotactl */
+ { 1, s(struct linux_sys_getpgid_args) }, /* 132 = getpgid */
+ { 1, s(struct sys_fchdir_args) }, /* 133 = fchdir */
+ { 0, 0 }, /* 134 = bdflush */
+ { 0, 0 }, /* 135 = sysfs */
+ { 1, s(struct linux_sys_personality_args) }, /* 136 = personality */
+ { 0, 0 }, /* 137 = afs_syscall */
+ { 1, s(struct linux_sys_setfsuid_args) }, /* 138 = linux_setfsuid16 */
+ { 0, 0 }, /* 139 = linux_getfsuid16 */
+ { 5, s(struct linux_sys_llseek_args) }, /* 140 = llseek */
+ { 3, s(struct linux_sys_getdents_args) }, /* 141 = getdents */
+ { 5, s(struct linux_sys_select_args) }, /* 142 = select */
+ { 2, s(struct sys_flock_args) }, /* 143 = flock */
+ { 3, s(struct sys_msync_args) }, /* 144 = msync */
+ { 3, s(struct sys_readv_args) }, /* 145 = readv */
+ { 3, s(struct sys_writev_args) }, /* 146 = writev */
+ { 1, s(struct linux_sys_getsid_args) }, /* 147 = getsid */
+ { 1, s(struct linux_sys_fdatasync_args) }, /* 148 = fdatasync */
+ { 1, s(struct linux_sys___sysctl_args) }, /* 149 = __sysctl */
+ { 2, s(struct sys_mlock_args) }, /* 150 = mlock */
+ { 2, s(struct sys_munlock_args) }, /* 151 = munlock */
+ { 0, 0 }, /* 152 = mlockall */
+ { 0, 0 }, /* 153 = munlockall */
+ { 2, s(struct linux_sys_sched_setparam_args) }, /* 154 = sched_setparam */
+ { 2, s(struct linux_sys_sched_getparam_args) }, /* 155 = sched_getparam */
+ { 3, s(struct linux_sys_sched_setscheduler_args) }, /* 156 = sched_setscheduler */
+ { 1, s(struct linux_sys_sched_getscheduler_args) }, /* 157 = sched_getscheduler */
+ { 0, 0 }, /* 158 = sched_yield */
+ { 1, s(struct linux_sys_sched_get_priority_max_args) }, /* 159 = sched_get_priority_max */
+ { 1, s(struct linux_sys_sched_get_priority_min_args) }, /* 160 = sched_get_priority_min */
+ { 0, 0 }, /* 161 = sched_rr_get_interval */
+ { 2, s(struct sys_nanosleep_args) }, /* 162 = nanosleep */
+ { 4, s(struct linux_sys_mremap_args) }, /* 163 = mremap */
+ { 3, s(struct linux_sys_setresuid16_args) }, /* 164 = setresuid16 */
+ { 3, s(struct linux_sys_getresuid_args) }, /* 165 = linux_getresuid16 */
+ { 0, 0 }, /* 166 = vm86 */
+ { 0, 0 }, /* 167 = query_module */
+ { 3, s(struct sys_poll_args) }, /* 168 = poll */
+ { 0, 0 }, /* 169 = nfsservctl */
+ { 3, s(struct linux_sys_setresgid16_args) }, /* 170 = setresgid16 */
+ { 3, s(struct linux_sys_getresgid16_args) }, /* 171 = getresgid16 */
+ { 0, 0 }, /* 172 = prctl */
+ { 1, s(struct linux_sys_rt_sigreturn_args) }, /* 173 = rt_sigreturn */
+ { 4, s(struct linux_sys_rt_sigaction_args) }, /* 174 = rt_sigaction */
+ { 4, s(struct linux_sys_rt_sigprocmask_args) }, /* 175 = rt_sigprocmask */
+ { 2, s(struct linux_sys_rt_sigpending_args) }, /* 176 = rt_sigpending */
+ { 0, 0 }, /* 177 = rt_sigtimedwait */
+ { 0, 0 }, /* 178 = rt_queueinfo */
+ { 2, s(struct linux_sys_rt_sigsuspend_args) }, /* 179 = rt_sigsuspend */
+ { 4, s(struct linux_sys_pread_args) }, /* 180 = pread */
+ { 4, s(struct linux_sys_pwrite_args) }, /* 181 = pwrite */
+ { 3, s(struct linux_sys_chown16_args) }, /* 182 = chown16 */
+ { 2, s(struct linux_sys_getcwd_args) }, /* 183 = getcwd */
+ { 0, 0 }, /* 184 = capget */
+ { 0, 0 }, /* 185 = capset */
+ { 2, s(struct linux_sys_sigaltstack_args) }, /* 186 = sigaltstack */
+ { 0, 0 }, /* 187 = sendfile */
+ { 0, 0 }, /* 188 = getpmsg */
+ { 0, 0 }, /* 189 = putpmsg */
+ { 0, 0 }, /* 190 = vfork */
+ { 2, s(struct linux_sys_ugetrlimit_args) }, /* 191 = ugetrlimit */
+ { 0, 0 }, /* 192 = mmap2 */
+ { 2, s(struct linux_sys_truncate64_args) }, /* 193 = truncate64 */
+ { 2, s(struct sys_ftruncate_args) }, /* 194 = linux_ftruncate64 */
+ { 2, s(struct linux_sys_stat64_args) }, /* 195 = stat64 */
+ { 2, s(struct linux_sys_lstat64_args) }, /* 196 = lstat64 */
+ { 2, s(struct linux_sys_fstat64_args) }, /* 197 = fstat64 */
+ { 0, 0 }, /* 198 = lchown */
+ { 0, 0 }, /* 199 = getuid */
+ { 0, 0 }, /* 200 = getgid */
+ { 0, 0 }, /* 201 = geteuid */
+ { 0, 0 }, /* 202 = getegid */
+ { 0, 0 }, /* 203 = setreuid */
+ { 0, 0 }, /* 204 = setregid */
+ { 2, s(struct sys_getgroups_args) }, /* 205 = getgroups */
+ { 2, s(struct sys_setgroups_args) }, /* 206 = setgroups */
+ { 0, 0 }, /* 207 = fchown */
+ { 0, 0 }, /* 208 = setresuid */
+ { 3, s(struct linux_sys_getresuid_args) }, /* 209 = getresuid */
+ { 0, 0 }, /* 210 = setresgid */
+ { 0, 0 }, /* 211 = getresgid */
+ { 0, 0 }, /* 212 = chown */
+ { 1, s(struct sys_setuid_args) }, /* 213 = setuid */
+ { 1, s(struct sys_setgid_args) }, /* 214 = setgid */
+ { 1, s(struct linux_sys_setfsuid_args) }, /* 215 = setfsuid */
+ { 0, 0 }, /* 216 = setfsgid */
+ { 0, 0 }, /* 217 = pivot_root */
+ { 0, 0 }, /* 218 = mincore */
+ { 0, 0 }, /* 219 = madvise */
+ { 0, 0 }, /* 220 = getdents64 */
+ { 3, s(struct linux_sys_fcntl64_args) }, /* 221 = fcntl64 */
+ /* XXX These need to be filled out */
+ { 0, 0 }, /* 222 */
+ { 0, 0 }, /* 223 */
+ { 0, 0 }, /* 224 */
+ { 0, 0 }, /* 225 */
+ { 0, 0 }, /* 226 */
+ { 0, 0 }, /* 227 */
+ { 0, 0 }, /* 228 */
+ { 0, 0 }, /* 229 */
+ { 0, 0 }, /* 230 */
+ { 0, 0 }, /* 231 */
+ { 0, 0 }, /* 232 */
+ { 0, 0 }, /* 233 */
+ { 0, 0 }, /* 234 */
+ { 0, 0 }, /* 235 */
+ { 0, 0 }, /* 236 */
+ { 0, 0 }, /* 237 */
+ { 0, 0 }, /* 238 */
+ { 0, 0 }, /* 239 */
+ { 0, 0 }, /* 240 */
+ { 0, 0 }, /* 241 */
+ { 0, 0 }, /* 242 */
+ { 0, 0 }, /* 243 */
+ { 0, 0 }, /* 244 */
+ { 0, 0 }, /* 245 */
+ { 0, 0 }, /* 246 */
+ { 0, 0 }, /* 247 */
+ { 0, 0 }, /* 248 */
+ { 0, 0 }, /* 249 */
+ { 0, 0 }, /* 250 */
+ { 0, 0 }, /* 251 */
+ { 0, 0 }, /* 252 */
+ { 0, 0 }, /* 253 */
+ { 0, 0 }, /* 254 */
+ { 0, 0 }, /* 255 */
+ { 0, 0 }, /* 256 */
+};
diff -ruN linux-2.6.19-vanilla/drivers/systrace/Makefile linux-2.6.19/drivers/systrace/Makefile
--- linux-2.6.19-vanilla/drivers/systrace/Makefile 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19/drivers/systrace/Makefile 2006-12-07 18:55:36.000000000 +0100
@@ -0,0 +1 @@
+obj-y := systrace.o policy.o linux_sysent.o
diff -ruN linux-2.6.19-vanilla/drivers/systrace/policy.c linux-2.6.19/drivers/systrace/policy.c
--- linux-2.6.19-vanilla/drivers/systrace/policy.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19/drivers/systrace/policy.c 2006-12-07 18:55:36.000000000 +0100
@@ -0,0 +1,159 @@
+/*
+ * policy.c
+ *
+ * Copyright (c) 2002 Marius Aamodt Eriksen <[email protected]>
+ * Copyright (c) 2002 Niels Provos <[email protected]>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The names of the copyright holders may not be used to endorse or
+ * promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/fs.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+#include <linux/queue.h>
+
+#include <asm/semaphore.h>
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+
+#include <linux/queue.h>
+#include <linux/systrace.h>
+
+#include "systrace-private.h"
+
+extern int systrace_debug;
+
+int
+systrace_policy(struct fsystrace *fst, struct systrace_policy *pol)
+{
+ struct str_policy *strpol;
+ struct str_process *strp;
+
+ switch(pol->strp_op) {
+ case SYSTR_POLICY_NEW:
+ DPRINTF(("%s: new, ents %d\n", __func__, pol->strp_maxents));
+
+ if (pol->strp_maxents <= 0 || pol->strp_maxents > 1024)
+ return (-EINVAL);
+ strpol = systrace_newpolicy(fst, pol->strp_maxents);
+ if (strpol == NULL)
+ return (-ENOBUFS);
+ pol->strp_num = strpol->nr;
+ break;
+ case SYSTR_POLICY_ASSIGN:
+ DPRINTF(("%s: %d -> pid %d\n", __func__,
+ pol->strp_num, pol->strp_pid));
+
+ /* Find right policy by number */
+ TAILQ_FOREACH(strpol, &fst->policies, next)
+ if (strpol->nr == pol->strp_num)
+ break;
+ if (strpol == NULL)
+ return (-EINVAL);
+
+ strp = systrace_findpid(fst, pol->strp_pid);
+ if (strp == NULL)
+ return (-EINVAL);
+
+ if (strp->policy != NULL)
+ systrace_closepolicy(fst, strp->policy);
+ strp->policy = strpol;
+ strpol->refcount++;
+ break;
+ case SYSTR_POLICY_MODIFY:
+ DPRINTF(("%s: %d: code %d -> policy %d\n", __func__,
+ pol->strp_num, pol->strp_code, pol->strp_policy));
+
+ if (!POLICY_VALID(pol->strp_policy) && pol->strp_policy >= 0)
+ return (-EINVAL);
+ TAILQ_FOREACH(strpol, &fst->policies, next)
+ if (strpol->nr == pol->strp_num)
+ break;
+ if (strpol == NULL)
+ return (-EINVAL);
+ if (pol->strp_code < 0 || pol->strp_code >= strpol->nsysent)
+ return (-EINVAL);
+ strpol->sysent[pol->strp_code] = pol->strp_policy;
+ break;
+ default:
+ return (-EINVAL);
+ }
+
+ return (0);
+}
+
+struct str_policy *
+systrace_newpolicy(struct fsystrace *fst, int maxents)
+{
+ struct str_policy *pol;
+ int i;
+
+ if (fst->npolicies > SYSTR_MAX_POLICIES /* && !fst->issuser */)
+ return (NULL);
+
+ if ((pol = kmalloc(sizeof(*pol), GFP_KERNEL)) == NULL)
+ return (NULL);
+
+ DPRINTF(("%s: allocating %d -> %lu\n", __func__,
+ maxents, (u_long)maxents * sizeof(int)));
+
+ memset(pol, 0, sizeof(*pol));
+
+ if ((pol->sysent = kmalloc(maxents * sizeof(short), GFP_KERNEL)) == NULL) {
+ kfree(pol);
+ return (NULL);
+ }
+ pol->nsysent = maxents;
+ for (i = 0; i < maxents; i++)
+ pol->sysent[i] = SYSTR_POLICY_ASK;
+
+ fst->npolicies++;
+ pol->nr = fst->npolicynr++;
+ pol->refcount = 1;
+
+ TAILQ_INSERT_TAIL(&fst->policies, pol, next);
+
+ return (pol);
+}
+
+void
+systrace_closepolicy(struct fsystrace *fst, struct str_policy *policy)
+{
+ if (--policy->refcount)
+ return;
+
+ fst->npolicies--;
+
+ if (policy->nsysent)
+ kfree(policy->sysent);
+
+ TAILQ_REMOVE(&fst->policies, policy, next);
+
+ kfree(policy);
+}
diff -ruN linux-2.6.19-vanilla/drivers/systrace/systrace.c linux-2.6.19/drivers/systrace/systrace.c
--- linux-2.6.19-vanilla/drivers/systrace/systrace.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19/drivers/systrace/systrace.c 2006-12-07 18:55:36.000000000 +0100
@@ -0,0 +1,1378 @@
+/*
+ * systrace.c
+ *
+ * Copyright (c) 2002 Marius Aamodt Eriksen <[email protected]>
+ * Copyright (c) 2002 Niels Provos <[email protected]>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The names of the copyright holders may not be used to endorse or
+ * promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * XXX clone()'s with same PID
+ */
+
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/fs.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+#include <linux/sys.h>
+#include <linux/miscdevice.h>
+#include <linux/queue.h>
+#include <linux/mount.h>
+#include <linux/init.h>
+
+#include <asm/semaphore.h>
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/unistd.h>
+
+#include <linux/queue.h>
+#include <linux/systrace.h>
+#include <linux/poll.h>
+
+#include "systrace-private.h"
+
+#define FIXARGS(argsize, args, regs) do { \
+ switch (argsize) { \
+ case 20: \
+ args[4] = regs->edi; \
+ case 16: \
+ args[3] = regs->esi; \
+ case 12: \
+ args[2] = regs->edx; \
+ case 8: \
+ args[1] = regs->ecx; \
+ case 4: \
+ args[0] = regs->ebx; \
+ case 0: \
+ break; \
+ default: \
+ printk(KERN_ERR "systrace: (FIXARGS) Illegal argument size %d\n", argsize);\
+ BUG(); \
+ } \
+} while (0)
+
+#define SAVEARGS(argsize, args, regs) do { \
+ switch (argsize) { \
+ case 20: \
+ regs->edi = args[4]; \
+ case 16: \
+ regs->esi = args[3]; \
+ case 12: \
+ regs->edx = args[2]; \
+ case 8: \
+ regs->ecx = args[1]; \
+ case 4: \
+ regs->ebx = args[0]; \
+ case 0: \
+ break; \
+ default: \
+ printk(KERN_ERR "systrace: Illegal argument size %d\n", argsize);\
+ BUG(); \
+ } \
+} while (0)
+
+#define PRINTARGS(argsize, regs) do { \
+ switch (argsize) { \
+ case 20: \
+ printk(" edi: %lx\n", regs->edi); \
+ case 16: \
+ printk(" esi: %lx\n", regs->esi); \
+ case 12: \
+ printk(" edx: %lx\n", regs->edx); \
+ case 8: \
+ printk(" ecx: %lx\n", regs->ecx); \
+ case 4: \
+ printk(" ebx: %lx\n", regs->ebx); \
+ case 0: \
+ break; \
+ default: \
+ printk(KERN_ERR "systrace: Illegal argument size %d\n", argsize);\
+ BUG(); \
+ } \
+} while (0)
+
+#define SYSTRACE_MINOR 226
+
+spinlock_t str_lck = SPIN_LOCK_UNLOCKED;
+int systrace_debug = 0;
+
+
+/*
+ * Pass by registers; we need the stack that the system call will see
+ * in order to examine it and possibly modify.
+ */
+
+int FASTCALL(systrace_intercept(struct pt_regs *));
+void FASTCALL(systrace_result(struct pt_regs *));
+
+static struct file_operations systrace_fops = {
+ read: &systracef_read,
+ write: &systracef_write,
+ ioctl: &systracef_ioctl,
+ release: &systracef_release,
+ open: &systracef_open,
+ poll: &systracef_poll
+};
+
+static struct miscdevice systrace_dev = {
+ SYSTRACE_MINOR,
+ "systrace",
+ &systrace_fops
+};
+
+void
+_systrace_lock(void)
+{
+ spin_lock(&str_lck);
+}
+
+void
+_systrace_unlock(void)
+{
+ spin_unlock(&str_lck);
+}
+
+int
+init_systrace(void)
+{
+ if (misc_register(&systrace_dev) < 0) {
+ printk(KERN_INFO "systrace: unable to register device\n");
+ return (-EIO);
+ }
+
+ printk(KERN_INFO "systrace: systrace initialized\n");
+
+ return (0);
+}
+subsys_initcall(init_systrace);
+
+int
+systracef_open(struct inode *inode, struct file *file)
+{
+ struct fsystrace *fst;
+ int error = 0;
+
+ if ((fst = kmalloc(sizeof(*fst), GFP_KERNEL)) == NULL) {
+ printk(KERN_ERR "systrace: Failed to allocate kernel memory.\n");
+ error = 0;
+ goto out;
+ }
+
+ memset(fst, 0, sizeof(*fst));
+
+ TAILQ_INIT(&fst->processes);
+ TAILQ_INIT(&fst->policies);
+ TAILQ_INIT(&fst->messages);
+
+ init_MUTEX(&fst->lock);
+ init_waitqueue_head(&fst->wqh);
+
+ fst->euid = current->euid;
+ fst->egid = current->egid;
+ fst->issuser = capable(CAP_SYS_ADMIN);
+ fst->pid = current->pid;
+
+ file->private_data = fst;
+
+ out:
+ return (error);
+}
+
+int
+systracef_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct fsystrace *fst = (struct fsystrace *)file->private_data;
+ pid_t pid = 0;
+ struct str_process *strp = NULL;
+ int error = 0;
+ void *data = NULL;
+
+ if (fst == NULL) {
+ printk(KERN_ERR "systrace: in impossible state!\n");
+ BUG();
+ }
+
+ /* Argument santizing */
+ switch (cmd) {
+ case STRIOCATTACH:
+ case STRIOCANSWER:
+ case STRIOCIO:
+ case STRIOCGETCWD:
+ case STRIOCDETACH:
+ case STRIOCPOLICY:
+ case STRIOCREPLACE:
+ if ((void *)arg == NULL)
+ error = -EINVAL;
+ break;
+ case STRIOCRESCWD:
+ default:
+ break;
+ }
+
+ if (error != 0)
+ goto out;
+
+ switch (cmd) {
+ case STRIOCANSWER:
+ if ((data = kmalloc(sizeof(struct systrace_answer),
+ GFP_KERNEL)) == NULL) {
+ error = -ENOSPC;
+ break;
+ }
+ if (copy_from_user((struct systrace_answer *)data,
+ (struct systrace_answer *)arg,
+ sizeof(struct systrace_answer)) != 0) {
+ kfree(data);
+ error = -EFAULT;
+ break;
+ }
+
+ pid = ((struct systrace_answer *)data)->stra_pid;
+ break;
+ case STRIOCIO:
+ if ((data = kmalloc(sizeof(struct systrace_io),
+ GFP_KERNEL)) == NULL) {
+ error = -ENOSPC;
+ break;
+ }
+ if (copy_from_user((struct systrace_io *)data,
+ (struct systrace_io *)arg,
+ sizeof(struct systrace_io)) != 0) {
+ kfree(data);
+ error = -EFAULT;
+ break;
+ }
+
+ pid = ((struct systrace_io *)data)->strio_pid;
+ break;
+ case STRIOCGETCWD:
+ case STRIOCDETACH:
+ if (get_user(pid, (pid_t *)arg) != 0)
+ error = -EFAULT;
+
+ if (pid == 0)
+ error = -EINVAL;
+ break;
+ case STRIOCATTACH:
+ case STRIOCRESCWD:
+ break;
+ case STRIOCPOLICY:
+ if ((data = kmalloc(sizeof(struct systrace_policy),
+ GFP_KERNEL)) == NULL) {
+ error = -ENOSPC;
+ break;
+ }
+ if (copy_from_user((struct systrace_policy *)data,
+ (struct systrace_policy *)arg,
+ sizeof(struct systrace_policy)) != 0) {
+ kfree(data);
+ error = -EFAULT;
+ break;
+ }
+ break;
+ case STRIOCREPLACE:
+ if ((data = kmalloc(sizeof(struct systrace_replace),
+ GFP_KERNEL)) == NULL) {
+ error = -ENOSPC;
+ break;
+ }
+ if (copy_from_user((struct systrace_replace *)data,
+ (struct systrace_replace *)arg,
+ sizeof(struct systrace_replace)) != 0) {
+ kfree(data);
+ error = -EFAULT;
+ break;
+ }
+
+ pid = ((struct systrace_replace *)data)->strr_pid;
+ break;
+ default:
+ error = -EINVAL;
+ }
+
+ if (error != 0)
+ goto out;
+
+ systrace_lock();
+ down(&fst->lock);
+ systrace_unlock();
+
+ if (pid != 0)
+ if ((strp = systrace_findpid(fst, pid)) == NULL) {
+ error = -EINVAL;
+ goto unlock;
+ }
+
+ switch (cmd) {
+ case STRIOCATTACH:
+ if (get_user(pid, (pid_t *)arg) != 0)
+ error = -EFAULT;
+
+ if (pid == 0)
+ error = -EINVAL;
+ else
+ error = systrace_attach(fst, *(pid_t *)arg);
+ break;
+ case STRIOCDETACH:
+ error = systrace_detach(strp);
+ break;
+ case STRIOCANSWER:
+ error = systrace_answer(strp, (struct systrace_answer *)data);
+ break;
+ case STRIOCIO:
+ error = systrace_io(strp, (struct systrace_io *)data);
+ break;
+ case STRIOCGETCWD:
+ error = systrace_getcwd(fst, strp);
+ break;
+ case STRIOCRESCWD:
+ error = systrace_rescwd(fst);
+ break;
+ case STRIOCPOLICY:
+ error = systrace_policy(fst, (struct systrace_policy *)data);
+ if (copy_to_user((struct systrace_policy *)arg,
+ (struct systrace_policy *)data,
+ sizeof(struct systrace_policy)) != 0)
+ error = -EFAULT;
+ break;
+ case STRIOCREPLACE:
+ error = systrace_preprepl(strp, (struct systrace_replace *)data);
+ break;
+ default:
+ /* XXX */
+ break;
+ }
+
+ if (data != NULL)
+ kfree(data);
+
+ unlock:
+ up(&fst->lock);
+ out:
+ return (error);
+}
+
+unsigned int
+systracef_poll(struct file *file, struct poll_table_struct *wait)
+{
+ struct fsystrace *fst = (struct fsystrace *)file->private_data;
+ unsigned int ret = 0;
+
+ systrace_lock();
+ down(&fst->lock);
+ systrace_unlock();
+
+ poll_wait(file, &fst->wqh, wait);
+
+ if (TAILQ_FIRST(&fst->messages) != NULL)
+ ret = POLLIN | POLLRDNORM;
+
+ up(&fst->lock);
+
+ return (ret);
+}
+
+ssize_t
+systracef_read(struct file *filp, char *buf, size_t count, loff_t *off)
+{
+ struct fsystrace *fst = (struct fsystrace *)filp->private_data;
+ struct str_process *strp;
+ int error = 0;
+
+ if (count != sizeof(struct str_message))
+ return (-EINVAL);
+
+ again:
+ systrace_lock();
+ down(&fst->lock);
+ systrace_unlock();
+
+ if ((strp = TAILQ_FIRST(&fst->messages)) != NULL) {
+ error = copy_to_user(buf, &strp->msg, sizeof(struct str_message));
+ if (error != 0) {
+ error = -EFAULT;
+ } else {
+ error = sizeof(struct str_message);
+ TAILQ_REMOVE(&fst->messages, strp, msg_next);
+ CLR(strp->flags, STR_PROC_ONQUEUE);
+
+ if (SYSTR_MSG_NOPROCESS(strp))
+ kfree(strp);
+ }
+ } else if (TAILQ_FIRST(&fst->processes) == NULL) {
+ /* EOF situation */
+ ;
+ } else {
+ if (filp->f_flags & O_NONBLOCK) {
+ error = -EAGAIN;
+ } else {
+ up(&fst->lock);
+ interruptible_sleep_on(&fst->wqh);
+
+ if (signal_pending(current)) {
+ error = -ERESTARTSYS;
+ goto out;
+ }
+ goto again;
+ }
+ }
+
+ up(&fst->lock);
+ out:
+ return (error);
+}
+
+ssize_t
+systracef_write(struct file *filp, const char *buf, size_t count, loff_t *off)
+{
+ return (-ENOTSUPP);
+}
+
+int
+systracef_release(struct inode *inode, struct file *filp)
+{
+ struct str_process *strp;
+ struct fsystrace *fst = filp->private_data;
+ struct str_policy *strpol;
+
+ systrace_lock();
+ down(&fst->lock);
+ systrace_unlock();
+
+ /* Kill all traced processes */
+ while ((strp = TAILQ_FIRST(&fst->processes)) != NULL) {
+ struct task_struct *p = strp->proc;
+
+ systrace_detach(strp);
+ kill_proc(p->pid, SIGKILL, 1);
+ }
+
+ /* Clean up fork and exit messages */
+ while ((strp = TAILQ_FIRST(&fst->messages)) != NULL) {
+ TAILQ_REMOVE(&fst->messages, strp, msg_next);
+ kfree(strp);
+ }
+
+ /* Clean up policies */
+ while ((strpol = TAILQ_FIRST(&fst->policies)) != NULL)
+ systrace_closepolicy(fst, strpol);
+
+ up(&fst->lock);
+
+ kfree(filp->private_data);
+ filp->private_data = NULL;
+
+ return (0);
+}
+
+void
+systrace_fork(struct task_struct *parent, struct task_struct *child)
+{
+ struct str_process *parentstrp, *strp;
+ struct fsystrace *fst;
+
+ systrace_lock();
+ if ((parentstrp = parent->systrace) == NULL) {
+ systrace_unlock();
+ return;
+ }
+
+ fst = parentstrp->parent;
+ down(&fst->lock);
+ systrace_unlock();
+
+ if (systrace_insert_process(fst, child) != 0) {
+ printk(KERN_ERR "systrace: failed inserting process!\n");
+ goto out;
+ }
+
+ /* XXX make sure we have pid by this time in fork() */
+ if ((strp = systrace_findpid(fst, child->pid)) == NULL) {
+ printk(KERN_ERR "systrace: inconsistency in tracked process!\n");
+ BUG();
+ }
+
+ if ((strp->policy = parentstrp->policy) != NULL)
+ strp->policy->refcount++;
+
+ /* Fork message */
+ systrace_msg_child(fst, parentstrp, child->pid);
+ out:
+ up(&fst->lock);
+}
+
+void
+systrace_exit(struct task_struct *p)
+{
+ struct str_process *strp;
+ struct fsystrace *fst;
+
+ systrace_lock();
+ if ((strp = p->systrace) != NULL) {
+ fst = strp->parent;
+ down(&fst->lock);
+ systrace_unlock();
+
+ /* Notify our monitor of our death */
+ systrace_msg_child(fst, strp, -1);
+
+ systrace_detach(strp);
+ up(&fst->lock);
+ } else {
+ systrace_unlock();
+ }
+}
+
+void fastcall
+systrace_result(struct pt_regs *regs)
+{
+ struct str_process *strp;
+ struct fsystrace *fst;
+ int error, argsize, narg, code;
+ extern struct sysent linux_sysent[];
+
+ systrace_lock();
+
+ if ((strp = current->systrace) == NULL)
+ goto out;
+
+ code = strp->code;
+ narg = linux_sysent[code].sy_narg;
+ argsize = sizeof(register_t) * narg;
+
+ fst = strp->parent;
+
+ /* Restore elevated priveliges if appropriate */
+ if (strp->issuser) {
+ if (ISSET(strp->flags, STR_PROC_SETEUID)) {
+ if (current->euid == strp->seteuid) {
+ systrace_seteuid(current, strp->savedeuid);
+ CLR(strp->flags, STR_PROC_SETEUID);
+ }
+ if (current->egid == strp->setegid) {
+ systrace_setegid(current, strp->savedegid);
+ CLR(strp->flags, STR_PROC_SETEGID);
+ }
+ }
+ }
+
+ /* Change in UID/GID */
+ if (strp->oldegid != current->egid || strp->oldeuid != current->euid) {
+ down(&fst->lock);
+ systrace_unlock();
+
+ systrace_msg_ugid(fst, strp);
+ systrace_lock();
+ if ((strp = current->systrace) == NULL)
+ goto out;
+ }
+
+ if (ISSET(strp->flags, STR_PROC_SYSCALLRES)) {
+ CLR(strp->flags, STR_PROC_SYSCALLRES);
+
+ down(&fst->lock);
+ systrace_unlock();
+
+ error = regs->eax;
+
+ systrace_msg_result(fst, strp, error, code, argsize, strp->args);
+ systrace_lock();
+ if ((strp = current->systrace) == NULL)
+ goto out;
+ }
+
+ if (strp->replace != NULL) {
+ kfree(strp->replace);
+ strp->replace = NULL;
+ }
+
+ if (ISSET(strp->flags, STR_PROC_FSCHANGE))
+ set_fs(strp->oldfs);
+
+ out:
+ systrace_unlock();
+}
+
+/*
+ * XXX serialize system calls
+ */
+int fastcall
+systrace_intercept(struct pt_regs *regs)
+{
+ register_t args[8];
+ int argsize, narg, code, error = 0, maycontrol = 0, issuser = 0;
+ short policy;
+ struct str_process *strp;
+ struct fsystrace *fst = NULL;
+ extern struct sysent linux_sysent[];
+ struct str_policy *strpolicy;
+
+ systrace_lock();
+
+ if ((strp = current->systrace) == NULL) {
+ systrace_unlock();
+ goto out;
+ }
+
+ fst = strp->parent;
+
+ down(&fst->lock);
+ systrace_unlock();
+
+ CLR(strp->flags, STR_PROC_FSCHANGE);
+
+ if (regs != NULL) {
+ code = regs->orig_eax;
+ } else {
+ error = -EPERM;
+ goto out;
+ }
+
+ if (code > NR_syscalls) {
+ printk(KERN_ERR "systrace: in impossible state!\n");
+ BUG();
+ }
+
+ narg = linux_sysent[code].sy_narg;
+ argsize = sizeof(register_t) * narg;
+
+ /*
+ * Linux passes system call arguments in registers. We want
+ * to be able to pass back an args array; convert
+ * appropriately.
+ */
+
+ FIXARGS(argsize, args, regs);
+
+ if (strp->proc != current) {
+ printk(KERN_ERR "systrace: inconsistency in process states!\n");
+ BUG();
+ }
+
+ if (fst->issuser) {
+ maycontrol = 1;
+ issuser = 1;
+ } else if (cap_isclear(current->cap_effective) &&
+ !(current->flags & PF_SUPERPRIV) &&
+ current->mm->dumpable) {
+ maycontrol = fst->euid == current->euid &&
+ fst->egid == current->egid;
+ }
+
+ strp->code = code;
+ strp->maycontrol = maycontrol;
+ memcpy(strp->args, args, sizeof(strp->args));
+ strp->oldeuid = current->euid;
+ strp->oldegid = current->egid;
+ strp->issuser = fst->issuser;
+
+ if (!maycontrol) {
+ policy = SYSTR_POLICY_PERMIT;
+ } else {
+ /* Find out current policy */
+ if ((strpolicy = strp->policy) == NULL) {
+ policy = SYSTR_POLICY_ASK;
+ } else {
+ if (code >= strpolicy->nsysent)
+ policy = SYSTR_POLICY_NEVER;
+ else
+ policy = strpolicy->sysent[code];
+ }
+ }
+
+ switch (policy) {
+ case SYSTR_POLICY_PERMIT:
+ break;
+ case SYSTR_POLICY_ASK:
+ error = systrace_msg_ask(fst, strp, code, argsize, args);
+ /* systrace_msg_ask releases lock */
+ fst = NULL;
+ /* We might have detached by now for some reason */
+ if (error == 0 && (strp = current->systrace) != NULL) {
+ /* XXX - do I need to lock here? */
+ if (strp->answer == SYSTR_POLICY_NEVER) {
+ error = strp->error;
+ if (strp->replace != NULL) {
+ kfree(strp->replace);
+ strp->replace = NULL;
+ }
+ } else if (strp->replace != NULL) {
+ if ((error = systrace_replace(strp,
+ argsize, args) == 0)) {
+ SAVEARGS(argsize, args, regs);
+ strp->oldfs = get_fs();
+ set_fs(get_ds());
+ SET(strp->flags, STR_PROC_FSCHANGE);
+ }
+ }
+ }
+ break;
+ case SYSTR_POLICY_NEVER:
+ error = -EPERM;
+ break;
+ default:
+ if (policy < 0)
+ error = policy;
+ else
+ error = -EPERM;
+ break;
+ }
+
+ /* XXX */
+/*
+ if (error != 0)
+ goto out;
+*/
+ systrace_lock();
+ if ((strp = current->systrace) != NULL) {
+ if (issuser) {
+ if (ISSET(strp->flags, STR_PROC_SETEUID)) {
+ strp->savedeuid = systrace_seteuid(current, strp->seteuid);
+ }
+ if (ISSET(strp->flags, STR_PROC_SETEGID)) {
+ strp->savedegid = systrace_setegid(current, strp->setegid);
+ }
+ } else {
+ CLR(strp->flags, STR_PROC_SETEUID | STR_PROC_SETEGID);
+ }
+ }
+ systrace_unlock();
+
+ out:
+ if (fst != NULL)
+ up(&fst->lock);
+
+ return (error);
+}
+
+int
+systrace_preprepl(struct str_process *strp, struct systrace_replace *repl)
+{
+ size_t len;
+ int i, error = 0;
+
+ if ((error = systrace_processready(strp)) != 0)
+ return (error);
+
+ if (strp->replace != NULL) {
+ kfree(strp->replace);
+ strp->replace = NULL;
+ }
+
+ if (repl->strr_nrepl < 0 || repl->strr_nrepl > SYSTR_MAXARGS)
+ return (-EINVAL);
+
+ for (i = 0, len = 0; i < repl->strr_nrepl; i++) {
+ len += repl->strr_offlen[i];
+ if (repl->strr_offlen[i] == 0)
+ continue;
+ if (repl->strr_offlen[i] + repl->strr_off[i] > len)
+ return (-EINVAL);
+ }
+
+ /* Make sure that the length adds up */
+ if (repl->strr_len != len)
+ return (-EINVAL);
+
+ /* Check against a maximum length */
+ if (repl->strr_len > 2048)
+ return (-EINVAL);
+
+ if ((strp->replace = kmalloc(sizeof(*strp->replace) + len, GFP_KERNEL))
+ == NULL)
+ return (-ENOSPC);
+
+ memcpy(strp->replace, repl, sizeof(*strp->replace));
+
+ if (copy_from_user(strp->replace + 1, repl->strr_base, len) != 0) {
+ kfree(strp->replace);
+ strp->replace = NULL;
+ return (-EFAULT);
+ }
+
+ /* Adjust the offset */
+ repl = strp->replace;
+ repl->strr_base = (void *)(repl + 1);
+
+ return (0);
+}
+
+/*
+ * Replace the arguments with arguments from the monitoring process.
+ */
+int
+systrace_replace(struct str_process *strp, size_t argsize, register_t args[])
+{
+ struct systrace_replace *repl = strp->replace;
+ void *kbase;
+ int i, maxarg, ind, ret = 0;
+
+ maxarg = argsize / sizeof(register_t);
+
+ kbase = repl->strr_base;
+ for (i = 0; i < maxarg && i < repl->strr_nrepl; i++) {
+ ind = repl->strr_argind[i];
+ if (ind < 0 || ind >= maxarg) {
+ kfree(repl);
+ strp->replace = NULL;
+ return (-EINVAL);
+ }
+ if (repl->strr_offlen[i] == 0) {
+ args[ind] = repl->strr_off[i];
+ continue;
+ }
+
+ /* Replace the argument with the new address */
+ args[ind] = (register_t)(kbase + repl->strr_off[i]);
+ }
+
+ return (ret);
+}
+
+int
+systrace_answer(struct str_process *strp, struct systrace_answer *ans)
+{
+ int error = 0;
+
+ if (!POLICY_VALID(ans->stra_policy)) {
+ error = -EINVAL;
+ goto out;
+ }
+
+ /* Check if answer is in sync with us */
+ if (ans->stra_seqnr != strp->seqnr) {
+ error = -EINVAL;
+ goto out;
+ }
+
+ if ((error = systrace_processready(strp)) != 0)
+ goto out;
+
+ strp->answer = ans->stra_policy;
+ strp->error = ans->stra_error;
+ if (!strp->error)
+ strp->error = -EPERM;
+ if (ISSET(ans->stra_flags, SYSTR_FLAGS_RESULT))
+ SET(strp->flags, STR_PROC_SYSCALLRES);
+
+ /* See if we should elevate privileges for this system call */
+ if (ISSET(ans->stra_flags, SYSTR_FLAGS_SETEUID)) {
+ SET(strp->flags, STR_PROC_SETEUID);
+ strp->seteuid = ans->stra_seteuid;
+ }
+ if (ISSET(ans->stra_flags, SYSTR_FLAGS_SETEGID)) {
+ SET(strp->flags, STR_PROC_SETEGID);
+ strp->setegid = ans->stra_setegid;
+ }
+
+ /* Clearing the flag indicates to the process that it woke up */
+ CLR(strp->flags, STR_PROC_WAITANSWER);
+ wake_up(&strp->wqh);
+ out:
+
+ return (error);
+}
+
+int
+systrace_io(struct str_process *strp, struct systrace_io *io)
+{
+ int rw, ret = 0, copied, maycontrol = 0;
+ void *buf;
+ struct fsystrace *fst = strp->parent;
+ struct task_struct *tsk = strp->proc;
+
+ if (fst->issuser) {
+ maycontrol = 1;
+ } else if (cap_isclear(tsk->cap_effective) &&
+ !(tsk->flags & PF_SUPERPRIV) &&
+ tsk->mm->dumpable) {
+ maycontrol = current->euid == tsk->euid &&
+ current->egid == tsk->egid;
+ }
+
+ if (!maycontrol)
+ return (-EPERM);
+
+ if ((buf = kmalloc(io->strio_len, GFP_KERNEL)) == NULL) {
+ printk(KERN_ERR "systrace: failed to allocate kernel memory!\n");
+ return (-ENOMEM);
+ }
+
+ switch (io->strio_op) {
+ case SYSTR_READ:
+ rw = 0;
+ break;
+ case SYSTR_WRITE:
+ rw = 1;
+ if (copy_from_user(buf, io->strio_addr, io->strio_len)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ break;
+ default:
+ return (-EINVAL);
+ }
+
+ copied = access_process_vm(tsk, (unsigned long)io->strio_offs, buf,
+ io->strio_len, rw);
+
+ if (copied != io->strio_len) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ switch (io->strio_op) {
+ case SYSTR_READ:
+ if (copy_to_user(io->strio_addr, buf, io->strio_len)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ break;
+ }
+
+ out:
+ kfree(buf);
+
+ return (ret);
+}
+
+int
+systrace_getcwd(struct fsystrace *fst, struct str_process *strp)
+{
+ struct fs_struct *fsc, *fsp;
+ int error = 0;
+
+ if ((error = systrace_processready(strp)) != 0)
+ return (error);
+
+ task_lock(current);
+ task_lock(strp->proc);
+ fsc = current->fs;
+ fsp = strp->proc->fs;
+
+ if (fsc == NULL || fsp == NULL) {
+ task_unlock(current);
+ task_unlock(strp->proc);
+ return (-EINVAL);
+ }
+
+ fst->pwd_pid = strp->pid;
+
+ /* XXX altroot? */
+ write_lock(&fsc->lock);
+
+ fst->pwd_mnt = fsc->pwdmnt;
+ fst->pwd_dentry = fsc->pwd;
+ fst->root_mnt = fsc->rootmnt;
+ fst->root_dentry = fsc->root;
+
+ read_lock(&fsp->lock);
+ fsc->pwdmnt = mntget(fsp->pwdmnt);
+ fsc->pwd = dget(fsp->pwd);
+ fsc->rootmnt = mntget(fsp->rootmnt);
+ fsc->root = dget(fsp->root);
+ read_unlock(&fsp->lock);
+
+ write_unlock(&fsc->lock);
+
+ task_unlock(current);
+ task_unlock(strp->proc);
+
+ return (0);
+}
+
+int
+systrace_rescwd(struct fsystrace *fst)
+{
+ struct fs_struct *fsc;
+
+ if (fst->pwd_pid == 0)
+ return (-EINVAL);
+
+ fsc = current->fs;
+
+ write_lock(&fsc->lock);
+ dput(fsc->pwd);
+ mntput(fsc->pwdmnt);
+ dput(fsc->root);
+ mntput(fsc->rootmnt);
+
+ fsc->pwd = fst->pwd_dentry;
+ fsc->pwdmnt = fst->pwd_mnt;
+ fsc->root = fst->root_dentry;
+ fsc->rootmnt = fst->root_mnt;
+ write_unlock(&fsc->lock);
+
+ fst->pwd_pid = 0;
+
+ return (0);
+}
+
+int
+systrace_processready(struct str_process *strp)
+{
+ if (ISSET(strp->flags, STR_PROC_ONQUEUE))
+ return (-EBUSY);
+
+ if (!ISSET(strp->flags, STR_PROC_WAITANSWER))
+ return (-EBUSY);
+
+ if (ISSET(strp->proc->flags, PF_EXITING))
+ return (-EBUSY);
+
+#if 0
+ if (strp->proc->state != 0)
+ return (-EBUSY);
+#endif /* 0 */
+
+ return (0);
+}
+
+int
+systrace_insert_process(struct fsystrace *fst, struct task_struct *p)
+{
+ struct str_process *strp;
+
+ if ((strp = kmalloc(sizeof(*strp), GFP_KERNEL)) == NULL)
+ return (-ENOMEM);
+
+ memset(strp, 0, sizeof(*strp));
+
+ strp->pid = p->pid;
+ strp->proc = p;
+ strp->parent = fst;
+
+ init_waitqueue_head(&strp->wqh);
+ init_MUTEX(&strp->lock);
+
+ /* Insert into parent's process list */
+ TAILQ_INSERT_TAIL(&fst->processes, strp, next);
+ fst->nprocesses++;
+
+ /* XXX need process flag*/
+ p->systrace = strp;
+
+ return (0);
+}
+
+struct str_process *
+systrace_findpid(struct fsystrace *fst, pid_t pid)
+{
+ struct str_process *strp;
+ struct task_struct *proc;
+
+ TAILQ_FOREACH(strp, &fst->processes, next)
+ if (strp->pid == pid)
+ break;
+
+ if (strp == NULL)
+ return (NULL);
+
+ proc = systrace_find(strp);
+
+ return (proc != NULL ? strp : NULL);
+}
+
+int
+systrace_attach(struct fsystrace *fst, pid_t pid)
+{
+ struct task_struct *proc;
+
+ proc = find_task_by_pid(pid);
+ if (proc == NULL)
+ return (-EINVAL);
+
+ /* (1) Same process */
+
+ if (proc->pid == current->pid)
+ return (-EINVAL);
+
+ /* (2) System process */
+ /* XXX */
+
+ /* (3) Already being systraced */
+
+ if (proc->systrace != NULL)
+ return (-EBUSY);
+
+ /*
+ * (4) We do not own it, it's not set{u,g}id AND we are not
+ * root
+ */
+ if ((!cap_isclear(proc->cap_permitted) || proc->flags & PF_SUPERPRIV ||
+ proc->euid != current->euid || proc->egid != current->egid) &&
+ !capable(CAP_SYS_ADMIN))
+ return (-EPERM);
+
+ /* (5) It's init */
+ if (proc->pid == 1)
+ return (-EPERM);
+
+ return (systrace_insert_process(fst, proc));
+}
+
+int
+systrace_detach(struct str_process *strp)
+{
+ struct fsystrace *fst = strp->parent;
+ struct task_struct *proc;
+ int error = 0;
+
+ if ((proc = systrace_find(strp)) != NULL)
+ proc->systrace = NULL;
+ else
+ error = -EINVAL;
+
+ if (ISSET(strp->flags, STR_PROC_WAITANSWER)) {
+ CLR(strp->flags, STR_PROC_WAITANSWER);
+ wake_up(&strp->wqh);
+ }
+
+ fst = strp->parent;
+ wake_up(&fst->wqh);
+
+ if (ISSET(strp->flags, STR_PROC_ONQUEUE))
+ TAILQ_REMOVE(&fst->messages, strp, msg_next);
+
+ TAILQ_REMOVE(&fst->processes, strp, next);
+ fst->nprocesses--;
+
+ if (strp->policy != NULL)
+ systrace_closepolicy(fst, strp->policy);
+ if (strp->replace != NULL)
+ kfree(strp->replace);
+
+ kfree(strp);
+
+ return (error);
+}
+
+int
+systrace_msg_result(struct fsystrace *fst, struct str_process *strp,
+ int error, int code, size_t argsize, register_t args[])
+{
+ struct str_msg_ask *msg_ask = &strp->msg.msg_data.msg_ask;
+ int i;
+
+ msg_ask->code = code;
+ /* XXX argsize */
+ /* += fixup_socket_argsize ... () */
+ msg_ask->argsize = argsize;
+ msg_ask->result = error;
+ for (i = 0; i < argsize / sizeof(register_t) && i < SYSTR_MAXARGS; i++)
+ msg_ask->args[i] = args[i];
+
+ msg_ask->rval[0] = 0x42;
+ msg_ask->rval[1] = 0x42;
+
+ return (systrace_make_msg(strp, SYSTR_MSG_RES));
+}
+
+int
+systrace_msg_ask(struct fsystrace *fst, struct str_process *strp, int code,
+ size_t argsize, register_t args[])
+{
+ struct str_msg_ask *msg_ask = &strp->msg.msg_data.msg_ask;
+ int i;
+
+ msg_ask->code = code;
+ /* XXX argsize */
+ msg_ask->argsize = argsize;
+ for (i = 0; i < (argsize / sizeof(register_t)) && i < SYSTR_MAXARGS; i++)
+ msg_ask->args[i] = args[i];
+
+ return (systrace_make_msg(strp, SYSTR_MSG_ASK));
+}
+
+int
+systrace_msg_ugid(struct fsystrace *fst, struct str_process *strp)
+{
+ struct str_msg_ugid *msg_ugid = &strp->msg.msg_data.msg_ugid;
+ struct task_struct *tsk = strp->proc;
+
+ msg_ugid->uid = tsk->euid;
+ msg_ugid->gid = tsk->egid;
+
+ return (systrace_make_msg(strp, SYSTR_MSG_UGID));
+}
+
+int
+systrace_msg_execve(struct fsystrace *fst, struct str_process *strp, register_t patharg)
+{
+ struct str_msg_execve *msg_execve = &strp->msg.msg_data.msg_execve;
+
+ msg_execve->patharg = patharg;
+
+ return (systrace_make_msg(strp, SYSTR_MSG_EXECVE));
+}
+
+int
+systrace_msg_child(struct fsystrace *fst, struct str_process *strp, pid_t npid)
+{
+ struct str_process *nstrp;
+ struct str_message *msg;
+ struct str_msg_child *msg_child;
+
+ /* XXX - use kmem cache!@; pool_*() like interface to it? */
+ if ((nstrp = kmalloc(sizeof(*nstrp), GFP_KERNEL)) == NULL)
+ return (-1);
+
+ memset(nstrp, 0, sizeof(*nstrp));
+
+ DPRINTF(("%s: %p: pid %d -> pid %d\n", __func__, nstrp, strp->pid, npid));
+
+ msg = &nstrp->msg;
+ msg_child = &msg->msg_data.msg_child;
+
+ msg->msg_type = SYSTR_MSG_CHILD;
+ msg->msg_pid = strp->pid;
+ if (strp->policy)
+ msg->msg_policy = strp->policy->nr;
+ else
+ msg->msg_policy = -1;
+ msg_child->new_pid = npid;
+
+ TAILQ_INSERT_TAIL(&fst->messages, nstrp, msg_next);
+
+ wake_up(&fst->wqh);
+
+ return (0);
+}
+
+int
+systrace_make_msg(struct str_process *strp, int type)
+{
+ struct str_message *msg = &strp->msg;
+ struct fsystrace *fst = strp->parent;
+ int error = 0;
+
+ msg->msg_seqnr = ++strp->seqnr;
+ msg->msg_type = type;
+ msg->msg_pid = strp->pid;
+
+ if (strp->policy)
+ msg->msg_policy = strp->policy->nr;
+ else
+ msg->msg_policy = -1;
+
+ SET(strp->flags, STR_PROC_WAITANSWER);
+ if (ISSET(strp->flags, STR_PROC_ONQUEUE))
+ goto out;
+
+ TAILQ_INSERT_TAIL(&fst->messages, strp, msg_next);
+ SET(strp->flags, STR_PROC_ONQUEUE);
+ /*
+ * XXX; need to do schedule trick here; what if we sleep on
+ * up(), then we might have awoken again, without knowing
+ */
+ out:
+ wake_up(&fst->wqh);
+ lock_kernel();
+ up(&fst->lock);
+
+ /* Sleep until we have got a reply */
+ for (;;) {
+ interruptible_sleep_on(&strp->wqh);
+
+ if (signal_pending(current)) {
+ error = -EINTR;
+ break;
+ }
+
+ /* If we detach, then everything is permitted */
+ if ((strp = current->systrace) == NULL)
+ break;
+
+ if (!ISSET(strp->flags, STR_PROC_WAITANSWER))
+ break;
+ }
+
+ unlock_kernel();
+
+ return (0);
+}
+
+uid_t
+systrace_seteuid(struct task_struct *tsk, uid_t euid)
+{
+ uid_t oldeuid = tsk->euid;
+
+ if (euid == oldeuid)
+ return (oldeuid);
+
+ /* XXX */
+ tsk->mm->dumpable = 0;
+ wmb();
+
+ tsk->euid = euid;
+ tsk->fsuid = euid;
+
+ if (oldeuid != 0 && euid == 0)
+ current->cap_effective = CAP_FULL_SET;
+ else if (oldeuid == 0 && euid != 0)
+ cap_clear(current->cap_effective);
+
+ return (oldeuid);
+}
+
+gid_t
+systrace_setegid(struct task_struct *tsk, gid_t egid)
+{
+ uid_t oldegid = tsk->egid;
+
+ if (egid == oldegid)
+ return (oldegid);
+
+ /* XXX */
+ tsk->mm->dumpable = 0;
+ wmb();
+
+ tsk->egid = egid;
+ tsk->fsgid = egid;
+
+ return (oldegid);
+}
+
+struct task_struct *
+systrace_find(struct str_process *strp)
+{
+ struct task_struct *proc;
+
+ if ((proc = find_task_by_pid(strp->pid)) == NULL)
+ return (NULL);
+
+ if (proc != strp->proc)
+ return (NULL);
+
+ if (proc->systrace == NULL)
+ return (NULL);
+
+ return (proc);
+}
diff -ruN linux-2.6.19-vanilla/drivers/systrace/systrace-private.h linux-2.6.19/drivers/systrace/systrace-private.h
--- linux-2.6.19-vanilla/drivers/systrace/systrace-private.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19/drivers/systrace/systrace-private.h 2006-12-07 18:55:36.000000000 +0100
@@ -0,0 +1,144 @@
+/*
+ * systrace-private.h
+ *
+ * Copyright (c) 2002 Marius Aamodt Eriksen <[email protected]>
+ * Copyright (c) 2002 Niels Provos <[email protected]>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The names of the copyright holders may not be used to endorse or
+ * promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef SYSTRACE_PRIVATE_H
+#define SYSTRACE_PRIVATE_H
+
+#define POLICY_VALID(x) ((x) == SYSTR_POLICY_PERMIT || \
+ (x) == SYSTR_POLICY_ASK || \
+ (x) == SYSTR_POLICY_NEVER)
+
+#define DPRINTF(x) if (systrace_debug) printk x
+
+struct str_policy {
+ int nr;
+ struct emul *emul; /* XXX */
+ int refcount;
+ int nsysent;
+ short *sysent;
+ TAILQ_ENTRY(str_policy) next;
+};
+
+#define STR_PROC_ONQUEUE 0x01
+#define STR_PROC_WAITANSWER 0x02
+#define STR_PROC_SYSCALLRES 0x04
+#define STR_PROC_REPORT 0x08 /* Report emulation */
+#define STR_PROC_FSCHANGE 0x10
+#define STR_PROC_SETEUID 0x20 /* Elevate privileges */
+#define STR_PROC_SETEGID 0x40
+
+struct str_process {
+ TAILQ_ENTRY(str_process) next;
+ TAILQ_ENTRY(str_process) msg_next;
+ struct semaphore lock;
+ struct task_struct *proc;
+ pid_t pid;
+ struct fsystrace *parent;
+ struct str_policy *policy;
+ wait_queue_head_t wqh;
+ int flags;
+ short answer;
+ short error;
+ u16 seqnr; /* XXX: convert to u_int16_t */
+ struct str_message msg;
+ struct systrace_replace *replace;
+ int report;
+ mm_segment_t oldfs;
+ int maycontrol;
+ int code;
+ register_t args[8];
+ uid_t oldeuid;
+ gid_t oldegid;
+ uid_t savedeuid;
+ uid_t savedegid;
+ uid_t seteuid;
+ uid_t setegid;
+ int issuser;
+};
+
+/* VFS interface */
+int systracef_ioctl(struct inode *, struct file *, unsigned int,
+ unsigned long);
+ssize_t systracef_read(struct file *, char *, size_t, loff_t *);
+ssize_t systracef_write(struct file *, const char *, size_t, loff_t *);
+int systracef_open(struct inode *, struct file *);
+int systracef_release(struct inode *, struct file *);
+unsigned int systracef_poll(struct file *, struct poll_table_struct *);
+
+/* Policy handling */
+struct str_policy *systrace_newpolicy(struct fsystrace *, int);
+void systrace_closepolicy(struct fsystrace *, struct str_policy *);
+int systrace_policy(struct fsystrace *, struct systrace_policy *);
+struct str_policy *systrace_newpolicy(struct fsystrace *, int);
+
+/* Message utility functions */
+int systrace_msg_child(struct fsystrace *, struct str_process *, pid_t);
+int systrace_msg_result(struct fsystrace *, struct str_process *, int, int,
+ size_t, register_t[]);
+int systrace_msg_ask(struct fsystrace *, struct str_process *, int, size_t, register_t[]);
+int systrace_msg_ugid(struct fsystrace *, struct str_process *);
+int systrace_msg_execve(struct fsystrace *, struct str_process *, register_t);
+int systrace_make_msg(struct str_process *, int);
+int systrace_make_msg(struct str_process *, int);
+
+int systrace_io(struct str_process *, struct systrace_io *);
+int systrace_getcwd(struct fsystrace *, struct str_process *);
+int systrace_rescwd(struct fsystrace *);
+int systrace_attach(struct fsystrace *, pid_t);
+int systrace_detach(struct str_process *);
+int systrace_answer(struct str_process *, struct systrace_answer *);
+int systrace_insert_process(struct fsystrace *, struct task_struct *);
+int systrace_processready(struct str_process *);
+struct str_process *systrace_findpid(struct fsystrace *, pid_t);
+struct task_struct *systrace_find(struct str_process *);
+
+int systrace_preprepl(struct str_process *, struct systrace_replace *);
+int systrace_replace(struct str_process *, size_t, register_t[]);
+uid_t systrace_seteuid(struct task_struct *, uid_t);
+gid_t systrace_setegid(struct task_struct *, gid_t);
+
+#if 0
+void systrace_lock(void);
+void systrace_unlock(void);
+#endif /* 0 */
+/*
+ * Currently, disable the fine grained locking and use the big kernel
+ * lock instead. The only thing keeping me from using the fine
+ * grained locking is in systrace_make_msg(); when fst->lock is
+ * relinquished, there is a race condition until we sleep on the strp;
+ * it could have been detached in the mean time, causing nasty things
+ * to happen. When using the kernel lock, it is automatically
+ * relinquished when needed.
+ */
+#define systrace_lock(...) lock_kernel();
+#define systrace_unlock(...) unlock_kernel();
+
+#endif /* SYSTRACE_PRIVATE_H */
diff -ruN linux-2.6.19-vanilla/include/linux/queue.h linux-2.6.19/include/linux/queue.h
--- linux-2.6.19-vanilla/include/linux/queue.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19/include/linux/queue.h 2006-12-07 18:55:36.000000000 +0100
@@ -0,0 +1,145 @@
+/* $OpenBSD: queue.h,v 1.22 2001/06/23 04:39:35 angelos Exp $ */
+/* $NetBSD: queue.h,v 1.11 1996/05/16 05:17:14 mycroft Exp $ */
+
+/*
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)queue.h 8.5 (Berkeley) 8/20/94
+ */
+
+#ifndef _SYS_QUEUE_H_
+#define _SYS_QUEUE_H_
+
+/*
+ * Tail queue definitions.
+ */
+#define TAILQ_HEAD(name, type) \
+struct name { \
+ struct type *tqh_first; /* first element */ \
+ struct type **tqh_last; /* addr of last next element */ \
+}
+
+#define TAILQ_HEAD_INITIALIZER(head) \
+ { NULL, &(head).tqh_first }
+
+#define TAILQ_ENTRY(type) \
+struct { \
+ struct type *tqe_next; /* next element */ \
+ struct type **tqe_prev; /* address of previous next element */ \
+}
+
+/*
+ * tail queue access methods
+ */
+#define TAILQ_FIRST(head) ((head)->tqh_first)
+#define TAILQ_END(head) NULL
+#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+#define TAILQ_LAST(head, headname) \
+ (*(((struct headname *)((head)->tqh_last))->tqh_last))
+/* XXX */
+#define TAILQ_PREV(elm, headname, field) \
+ (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
+#define TAILQ_EMPTY(head) \
+ (TAILQ_FIRST(head) == TAILQ_END(head))
+
+#define TAILQ_FOREACH(var, head, field) \
+ for((var) = TAILQ_FIRST(head); \
+ (var) != TAILQ_END(head); \
+ (var) = TAILQ_NEXT(var, field))
+
+#define TAILQ_FOREACH_REVERSE(var, head, field, headname) \
+ for((var) = TAILQ_LAST(head, headname); \
+ (var) != TAILQ_END(head); \
+ (var) = TAILQ_PREV(var, headname, field))
+
+/*
+ * Tail queue functions.
+ */
+#define TAILQ_INIT(head) do { \
+ (head)->tqh_first = NULL; \
+ (head)->tqh_last = &(head)->tqh_first; \
+} while (0)
+
+#define TAILQ_INSERT_HEAD(head, elm, field) do { \
+ if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
+ (head)->tqh_first->field.tqe_prev = \
+ &(elm)->field.tqe_next; \
+ else \
+ (head)->tqh_last = &(elm)->field.tqe_next; \
+ (head)->tqh_first = (elm); \
+ (elm)->field.tqe_prev = &(head)->tqh_first; \
+} while (0)
+
+#define TAILQ_INSERT_TAIL(head, elm, field) do { \
+ (elm)->field.tqe_next = NULL; \
+ (elm)->field.tqe_prev = (head)->tqh_last; \
+ *(head)->tqh_last = (elm); \
+ (head)->tqh_last = &(elm)->field.tqe_next; \
+} while (0)
+
+#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
+ if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
+ (elm)->field.tqe_next->field.tqe_prev = \
+ &(elm)->field.tqe_next; \
+ else \
+ (head)->tqh_last = &(elm)->field.tqe_next; \
+ (listelm)->field.tqe_next = (elm); \
+ (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
+} while (0)
+
+#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
+ (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
+ (elm)->field.tqe_next = (listelm); \
+ *(listelm)->field.tqe_prev = (elm); \
+ (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \
+} while (0)
+
+#define TAILQ_REMOVE(head, elm, field) do { \
+ if (((elm)->field.tqe_next) != NULL) \
+ (elm)->field.tqe_next->field.tqe_prev = \
+ (elm)->field.tqe_prev; \
+ else \
+ (head)->tqh_last = (elm)->field.tqe_prev; \
+ *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
+} while (0)
+
+#define TAILQ_REPLACE(head, elm, elm2, field) do { \
+ if (((elm2)->field.tqe_next = (elm)->field.tqe_next) != NULL) \
+ (elm2)->field.tqe_next->field.tqe_prev = \
+ &(elm2)->field.tqe_next; \
+ else \
+ (head)->tqh_last = &(elm2)->field.tqe_next; \
+ (elm2)->field.tqe_prev = (elm)->field.tqe_prev; \
+ *(elm2)->field.tqe_prev = (elm2); \
+} while (0)
+
+#endif /* !_SYS_QUEUE_H_ */
diff -ruN linux-2.6.19-vanilla/include/linux/sched.h linux-2.6.19/include/linux/sched.h
--- linux-2.6.19-vanilla/include/linux/sched.h 2006-11-29 22:57:37.000000000 +0100
+++ linux-2.6.19/include/linux/sched.h 2006-12-07 18:27:10.000000000 +0100
@@ -982,6 +982,10 @@
unsigned long ptrace_message;
siginfo_t *last_siginfo; /* For ptrace use. */
+#ifdef CONFIG_SYSTRACE
+ void *systrace;
+#endif
+
/*
* current io wait handle: wait queue entry to use for io waits
* If this thread is processing aio, this points at the waitqueue
diff -ruN linux-2.6.19-vanilla/include/linux/systrace.h linux-2.6.19/include/linux/systrace.h
--- linux-2.6.19-vanilla/include/linux/systrace.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19/include/linux/systrace.h 2006-12-07 18:55:36.000000000 +0100
@@ -0,0 +1,216 @@
+/*
+ * systrace.h
+ *
+ * Copyright (c) 2002 Marius Aamodt Eriksen <[email protected]>
+ *
+ * These definitions are muchly replicated from Niels Provos' OpenBSD
+ * implementation.
+ */
+
+#ifndef _INCLUDE_LINUX_SYSTRACE_H
+#define _INCLUDE_LINUX_SYSTRACE_H
+
+/*
+ * XXX this is kind of nasty -- should add manually to everything that
+ * needs it
+ */
+
+#define SYSTR_EMULEN 8 /* sync with sys proc */
+
+#ifdef __KERNEL__
+/* XXX ugly. argh... linux... */
+typedef u32 register_t;
+#endif /* __KERNEL__ */
+
+struct str_msg_emul {
+ char emul[SYSTR_EMULEN];
+};
+
+#define SYSTR_MAX_POLICIES 64
+#define SYSTR_MAXARGS 64
+
+/* XXX change register_t (args, rval) to something portable. */
+struct str_msg_ask {
+ int code;
+ int argsize;
+ u32 args[SYSTR_MAXARGS];
+ u32 rval[2];
+ int result;
+};
+
+/* Queued on fork or exit of a process */
+
+struct str_msg_child {
+ pid_t new_pid;
+};
+struct str_msg_ugid {
+ uid_t uid;
+ gid_t gid;
+};
+
+struct str_msg_execve {
+ register_t patharg;
+};
+
+#define SYSTR_MSG_ASK 1
+#define SYSTR_MSG_RES 2
+#define SYSTR_MSG_EMUL 3
+#define SYSTR_MSG_CHILD 4
+#define SYSTR_MSG_UGID 5
+#define SYSTR_MSG_EXECVE 6
+
+#define SYSTR_MSG_NOPROCESS(x) \
+ ((x)->msg.msg_type == SYSTR_MSG_CHILD)
+
+#define MAXPATHLEN PATH_MAX
+
+struct str_message {
+ /* XXX - should be u_int16_t */
+ int msg_seqnr;
+ int msg_type;
+ pid_t msg_pid;
+ short msg_policy;
+ short reserved;
+ union {
+ struct str_msg_emul msg_emul;
+ struct str_msg_ask msg_ask;
+ struct str_msg_child msg_child;
+ struct str_msg_ugid msg_ugid;
+ struct str_msg_execve msg_execve;
+ } msg_data;
+};
+
+struct systrace_answer {
+ /* XXX - should be u_int16_t */
+ int stra_seqnr;
+ pid_t stra_pid;
+ int stra_policy;
+ int stra_error;
+ int stra_flags;
+ uid_t stra_seteuid; /* elevated privileges for system call */
+ gid_t stra_setegid;
+};
+
+#define SYSTR_READ 1
+#define SYSTR_WRITE 2
+
+struct systrace_io {
+ pid_t strio_pid;
+ int strio_op;
+ void *strio_offs;
+ void *strio_addr;
+ size_t strio_len;
+};
+
+#define SYSTR_POLICY_NEW 1
+#define SYSTR_POLICY_ASSIGN 2
+#define SYSTR_POLICY_MODIFY 3
+
+struct systrace_policy {
+ int strp_op;
+ int strp_num;
+ union {
+ struct {
+ short code;
+ short policy;
+ } assign;
+ pid_t pid;
+ int maxents;
+ } strp_data;
+};
+
+
+struct systrace_replace {
+ pid_t strr_pid;
+ int strr_nrepl;
+ void *strr_base;
+ size_t strr_len;
+ int strr_argind[SYSTR_MAXARGS];
+ size_t strr_off[SYSTR_MAXARGS];
+ size_t strr_offlen[SYSTR_MAXARGS];
+};
+
+#define strp_pid strp_data.pid
+#define strp_maxents strp_data.maxents
+#define strp_code strp_data.assign.code
+#define strp_policy strp_data.assign.policy
+
+/* ioctl definitions */
+#define STR_MAGIC 's'
+
+#define STRIOCATTACH _IOW(STR_MAGIC, 101, pid_t)
+#define STRIOCDETACH _IOW(STR_MAGIC, 102, pid_t)
+#define STRIOCANSWER _IOW(STR_MAGIC, 103, struct systrace_answer)
+#define STRIOCIO _IOWR(STR_MAGIC, 104, struct systrace_io)
+#define STRIOCPOLICY _IOWR(STR_MAGIC, 105, struct systrace_policy)
+#define STRIOCGETCWD _IOW(STR_MAGIC, 106, pid_t)
+#define STRIOCRESCWD _IO(STR_MAGIC, 107)
+#define STRIOWAKE _IO(STR_MAGIC, 108)
+#define STRIOCLONE _IOW(STR_MAGIC, 109, int *);
+#define STRIOCREPLACE _IOW(STR_MAGIC, 110, struct systrace_replace)
+
+#define SYSTR_POLICY_ASK 0
+#define SYSTR_POLICY_PERMIT 1
+#define SYSTR_POLICY_NEVER 2
+
+#define SYSTR_FLAGS_RESULT 0x001
+#define SYSTR_FLAGS_SETEUID 0x002
+#define SYSTR_FLAGS_SETEGID 0x004
+
+#ifdef __KERNEL__
+
+struct str_process;
+struct fsystrace {
+ struct semaphore lock;
+ wait_queue_head_t wqh;
+ TAILQ_HEAD(strprocessq, str_process) processes;
+ TAILQ_HEAD(strpolicyq, str_policy) policies;
+ int nprocesses;
+ struct strprocessq messages;
+ int npolicynr;
+ int npolicies;
+
+ int issuser;
+ uid_t euid;
+ gid_t egid;
+
+ pid_t pid;
+ /* cwd magic */
+ pid_t pwd_pid;
+ struct vfsmount *pwd_mnt;
+ struct dentry *pwd_dentry;
+ struct vfsmount *root_mnt;
+ struct dentry *root_dentry;
+};
+
+/* Internal prototypes */
+
+/*
+ int systrace_redirect(int, struct proc *, void *, register_t *);
+ void systrace_exit(struct proc *);
+ void systrace_fork(struct proc *, struct proc *);
+*/
+
+int init_systrace(void);
+void systrace_fork(struct task_struct *, struct task_struct *);
+void systrace_exit(struct task_struct *);
+
+/* crud needed to make systrace happy */
+struct sysent { /* system call table */
+ short sy_narg; /* number of args */
+ short sy_argsize; /* total size of arguments */
+};
+
+/* Macros to set/clear/test flags. */
+#define SET(t, f) ((t) |= (f))
+#define CLR(t, f) ((t) &= ~(f))
+#define ISSET(t, f) ((t) & (f))
+
+
+#endif /* __KERNEL__ */
+
+#ifndef __KERNEL__
+//typedef u_int32_t register_t;
+#endif /* !__KERNEL__ */
+
+#endif /* _INCLUDE_LINUX_SYSTRACE_H */
diff -ruN linux-2.6.19-vanilla/kernel/exit.c linux-2.6.19/kernel/exit.c
--- linux-2.6.19-vanilla/kernel/exit.c 2006-11-29 22:57:37.000000000 +0100
+++ linux-2.6.19/kernel/exit.c 2006-12-07 20:37:51.000000000 +0100
@@ -42,6 +42,12 @@
#include <linux/resource.h>
#include <linux/blkdev.h>
+#ifdef CONFIG_SYSTRACE
+#include <linux/queue.h>
+#include <asm/semaphore.h>
+#include <linux/systrace.h>
+#endif
+
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/pgtable.h>
@@ -914,6 +920,10 @@
taskstats_exit_send(tsk, tidstats, group_dead, mycpu);
taskstats_exit_free(tidstats);
+#ifdef CONFIG_SYSTRACE
+ systrace_exit(tsk);
+#endif
+
exit_mm(tsk);
if (group_dead)
diff -ruN linux-2.6.19-vanilla/kernel/fork.c linux-2.6.19/kernel/fork.c
--- linux-2.6.19-vanilla/kernel/fork.c 2006-11-29 22:57:37.000000000 +0100
+++ linux-2.6.19/kernel/fork.c 2006-12-07 18:27:10.000000000 +0100
@@ -39,6 +39,11 @@
#include <linux/rcupdate.h>
#include <linux/ptrace.h>
#include <linux/mount.h>
+#ifdef CONFIG_SYSTRACE
+#include <linux/queue.h>
+#include <asm/semaphore.h>
+#include <linux/systrace.h>
+#endif /* CONFIG_SYSTRACE */
#include <linux/audit.h>
#include <linux/profile.h>
#include <linux/rmap.h>
@@ -1385,6 +1390,11 @@
set_tsk_thread_flag(p, TIF_SIGPENDING);
}
+#ifdef CONFIG_SYSTRACE
+ if (current->systrace != NULL)
+ systrace_fork(current, p);
+#endif
+
if (!(clone_flags & CLONE_STOPPED))
wake_up_new_task(p, clone_flags);
else
Files linux-2.6.19-vanilla/scripts/kconfig/mconf and linux-2.6.19/scripts/kconfig/mconf differ
diff -ruN linux-2.6.19-vanilla/security/Kconfig linux-2.6.19/security/Kconfig
--- linux-2.6.19-vanilla/security/Kconfig 2006-11-29 22:57:37.000000000 +0100
+++ linux-2.6.19/security/Kconfig 2006-12-07 18:27:10.000000000 +0100
@@ -94,6 +94,7 @@
If you are unsure how to answer this question, answer N.
source security/selinux/Kconfig
+source drivers/systrace/Kconfig
endmenu
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
