alpha: Enable system-call auditing support.

Signed-off-by: Zhenglong.cai <zhenglong.cai@cs2c.com.cn>
Signed-off-by: Matt Turner <mattst88@gmail.com>

7 files changed, 80 insertions, 1 deletions

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index d39dc9b95a2c..f23ab8ba4912 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -16,6 +16,7 @@ config ALPHA
         select ARCH_WANT_IPC_PARSE_VERSION
         select ARCH_HAVE_NMI_SAFE_CMPXCHG
         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
+        select AUDIT_ARCH
         select GENERIC_CLOCKEVENTS
         select GENERIC_SMP_IDLE_THREAD
         select GENERIC_STRNCPY_FROM_USER
@@ -76,6 +77,8 @@ config GENERIC_ISA_DMA
 source "init/Kconfig"
 source "kernel/Kconfig.freezer"
 
+config AUDIT_ARCH
+        bool
 
 menu "System setup"
 
diff --git a/arch/alpha/include/asm/ptrace.h b/arch/alpha/include/asm/ptrace.h
index 21128505ddbe..9047c2fe8f23 100644
--- a/arch/alpha/include/asm/ptrace.h
+++ b/arch/alpha/include/asm/ptrace.h
@@ -19,4 +19,9 @@
 
 #define force_successful_syscall_return() (current_pt_regs()->r0 = 0)
 
+static inline unsigned long regs_return_value(struct pt_regs *regs)
+{
+        return regs->r0;
+}
+
 #endif
diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
index 453597b91f3a..3d6ce6d56fc9 100644
--- a/arch/alpha/include/asm/thread_info.h
+++ b/arch/alpha/include/asm/thread_info.h
@@ -70,6 +70,7 @@ register struct thread_info *__current_thread_info __asm__("$8");
 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 #define TIF_SIGPENDING          2       /* signal pending */
 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
+#define TIF_SYSCALL_AUDIT       4       /* syscall audit active */
 #define TIF_DIE_IF_KERNEL       9       /* dik recursion lock */
 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
 
@@ -77,6 +78,7 @@ register struct thread_info *__current_thread_info __asm__("$8");
 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
+#define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 
 /* Work to do on interrupt/exception return.  */
 #define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
diff --git a/arch/alpha/kernel/Makefile b/arch/alpha/kernel/Makefile
index 0d54650e78fc..3ecac0106c8a 100644
--- a/arch/alpha/kernel/Makefile
+++ b/arch/alpha/kernel/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_SRM_ENV)	+= srm_env.o
 obj-$(CONFIG_MODULES)   += module.o
 obj-$(CONFIG_PERF_EVENTS) += perf_event.o
 obj-$(CONFIG_RTC_DRV_ALPHA) += rtc.o
+obj-$(CONFIG_AUDIT)     += audit.o
 
 ifdef CONFIG_ALPHA_GENERIC
 
diff --git a/arch/alpha/kernel/audit.c b/arch/alpha/kernel/audit.c
new file mode 100644
index 000000000000..96a9d18ff4c4
--- /dev/null
+++ b/arch/alpha/kernel/audit.c
@@ -0,0 +1,60 @@
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/audit.h>
+#include <asm/unistd.h>
+
+static unsigned dir_class[] = {
+#include <asm-generic/audit_dir_write.h>
+~0U
+};
+
+static unsigned read_class[] = {
+#include <asm-generic/audit_read.h>
+~0U
+};
+
+static unsigned write_class[] = {
+#include <asm-generic/audit_write.h>
+~0U
+};
+
+static unsigned chattr_class[] = {
+#include <asm-generic/audit_change_attr.h>
+~0U
+};
+
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
+int audit_classify_arch(int arch)
+{
+        return 0;
+}
+
+int audit_classify_syscall(int abi, unsigned syscall)
+{
+        switch(syscall) {
+        case __NR_open:
+                return 2;
+        case __NR_openat:
+                return 3;
+        case __NR_execve:
+                return 5;
+        default:
+                return 0;
+        }
+}
+
+static int __init audit_classes_init(void)
+{
+        audit_register_class(AUDIT_CLASS_WRITE, write_class);
+        audit_register_class(AUDIT_CLASS_READ, read_class);
+        audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class);
+        audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+        audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
+        return 0;
+}
+
+__initcall(audit_classes_init);
diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index a969b95ee5ac..98703d99b565 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -465,7 +465,11 @@ entSys:
         .cfi_rel_offset $16, SP_OFF+24
         .cfi_rel_offset $17, SP_OFF+32
         .cfi_rel_offset $18, SP_OFF+40
-        blbs    $3, strace
+#ifdef CONFIG_AUDITSYSCALL
+        lda     $6, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
+        and     $3, $6, $3
+#endif
+        bne     $3, strace
         beq     $4, 1f
         ldq     $27, 0($5)
 1:      jsr     $26, ($27), alpha_ni_syscall
diff --git a/arch/alpha/kernel/ptrace.c b/arch/alpha/kernel/ptrace.c
index 2a4a80ff4a20..86d835157b54 100644
--- a/arch/alpha/kernel/ptrace.c
+++ b/arch/alpha/kernel/ptrace.c
@@ -14,6 +14,7 @@
 #include <linux/security.h>
 #include <linux/signal.h>
 #include <linux/tracehook.h>
+#include <linux/audit.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -316,15 +317,18 @@ long arch_ptrace(struct task_struct *child, long request,
 asmlinkage unsigned long syscall_trace_enter(void)
 {
         unsigned long ret = 0;
+        struct pt_regs *regs = current_pt_regs();
         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
             tracehook_report_syscall_entry(current_pt_regs()))
                 ret = -1UL;
+        audit_syscall_entry(AUDIT_ARCH_ALPHA, regs->r0, regs->r16, regs->r17, regs->r18, regs->r19);
         return ret ?: current_pt_regs()->r0;
 }
 
 asmlinkage void
 syscall_trace_leave(void)
 {
+        audit_syscall_exit(current_pt_regs());
         if (test_thread_flag(TIF_SYSCALL_TRACE))
                 tracehook_report_syscall_exit(current_pt_regs(), 0);
 }