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Date: Wed, 07 Nov 2007 14:04:46 +0900
From: Yuichi Nakamura <ynakam@...achisoft.jp>
To: linux-kernel@...r.kernel.org
Cc: linuxsh-dev@...ts.sf.net, lethal@...ux-sh.org, sgrubb@...hat.com,
ynakam@...achisoft.jp
Subject: [patch] audit support for SH
I found syscall audit does not work on SH(SuperH).
I made patch to support syscall audit for SH.
Signed-off-by: Yuichi Nakamura<ynakam@...achisoft.jp>
---
arch/sh/kernel/entry-common.S | 8 ++++++--
arch/sh/kernel/ptrace.c | 19 +++++++++++++++----
include/asm-sh/thread_info.h | 2 ++
init/Kconfig | 2 +-
4 files changed, 24 insertions(+), 7 deletions(-)
diff -purN -X linux-2.6.24.rc1/Documentation/dontdiff linux-2.6.24.rc1.orig/arch/sh/kernel/entry-common.S linux-2.6.24.rc1/arch/sh/kernel/entry-common.S
--- linux-2.6.24.rc1.orig/arch/sh/kernel/entry-common.S 2007-11-06 16:03:17.000000000 +0900
+++ linux-2.6.24.rc1/arch/sh/kernel/entry-common.S 2007-11-06 18:16:11.000000000 +0900
@@ -224,7 +224,7 @@ work_resched:
syscall_exit_work:
! r0: current_thread_info->flags
! r8: current_thread_info
- tst #_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP, r0
+ tst #_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP |_TIF_SYSCALL_AUDIT, r0
bt/s work_pending
tst #_TIF_NEED_RESCHED, r0
#ifdef CONFIG_TRACE_IRQFLAGS
@@ -234,6 +234,8 @@ syscall_exit_work:
#endif
sti
! XXX setup arguments...
+ mov r15, r4
+ mov #1, r5
mov.l 4f, r0 ! do_syscall_trace
jsr @r0
nop
@@ -244,6 +246,8 @@ syscall_exit_work:
syscall_trace_entry:
! Yes it is traced.
! XXX setup arguments...
+ mov r15, r4
+ mov #0, r5
mov.l 4f, r11 ! Call do_syscall_trace which notifies
jsr @r11 ! superior (will chomp R[0-7])
nop
@@ -366,7 +370,7 @@ ENTRY(system_call)
!
get_current_thread_info r8, r10
mov.l @(TI_FLAGS,r8), r8
- mov #_TIF_SYSCALL_TRACE, r10
+ mov #(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT), r10
tst r10, r8
bf syscall_trace_entry
!
diff -purN -X linux-2.6.24.rc1/Documentation/dontdiff linux-2.6.24.rc1.orig/arch/sh/kernel/ptrace.c linux-2.6.24.rc1/arch/sh/kernel/ptrace.c
--- linux-2.6.24.rc1.orig/arch/sh/kernel/ptrace.c 2007-11-06 16:03:17.000000000 +0900
+++ linux-2.6.24.rc1/arch/sh/kernel/ptrace.c 2007-11-07 08:46:14.000000000 +0900
@@ -6,7 +6,7 @@
* edited by Linus Torvalds
*
* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
- *
+ * Audit support: Yuichi Nakamura <ynakam@...achisoft.jp>
*/
#include <linux/kernel.h>
#include <linux/sched.h>
@@ -24,6 +24,7 @@
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>
+#include <linux/audit.h>
/*
* does not yet catch signals sent when the child dies.
@@ -248,15 +249,18 @@ long arch_ptrace(struct task_struct *chi
return ret;
}
-asmlinkage void do_syscall_trace(void)
+asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
{
struct task_struct *tsk = current;
+ if (unlikely(current->audit_context) && entryexit)
+ audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
+ regs->regs[0]);
if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
!test_thread_flag(TIF_SINGLESTEP))
- return;
+ goto out;
if (!(tsk->ptrace & PT_PTRACED))
- return;
+ goto out;
/* the 0x80 provides a way for the tracing parent to distinguish
between a syscall stop and SIGTRAP delivery */
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) &&
@@ -271,4 +275,11 @@ asmlinkage void do_syscall_trace(void)
send_sig(tsk->exit_code, tsk, 1);
tsk->exit_code = 0;
}
+
+out:
+ if (unlikely(current->audit_context) && !entryexit)
+ audit_syscall_entry(AUDIT_ARCH_SH, regs->regs[3],
+ regs->regs[4], regs->regs[5],
+ regs->regs[6], regs->regs[7]);
+
}
--- linux-2.6.24.rc1.orig/include/asm-sh/thread_info.h 2007-10-10 05:31:38.000000000 +0900
+++ linux-2.6.24.rc1/include/asm-sh/thread_info.h 2007-11-07 08:46:37.000000000 +0900
@@ -111,6 +111,7 @@ static inline struct thread_info *curren
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */
#define TIF_SINGLESTEP 4 /* singlestepping active */
+#define TIF_SYSCALL_AUDIT 5
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE 18
@@ -121,6 +122,7 @@ static inline struct thread_info *curren
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
+#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_FREEZE (1<<TIF_FREEZE)
--- linux-2.6.24.rc1.orig/init/Kconfig 2007-11-06 16:03:31.000000000 +0900
+++ linux-2.6.24.rc1/init/Kconfig 2007-11-06 16:19:08.000000000 +0900
@@ -226,7 +226,7 @@ config AUDIT
config AUDITSYSCALL
bool "Enable system-call auditing support"
- depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
+ depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
default y if SECURITY_SELINUX
help
Enable low-overhead system-call auditing infrastructure that
Regards,
--
Yuichi Nakamura
Hitachi Software Engineering Co., Ltd.
Japan SELinux Users Group(JSELUG): http://www.selinux.gr.jp/
SELinux Policy Editor: http://seedit.sourceforge.net/
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