alpha: Enable system-call auditing support.

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

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index d39dc9b..f23ab8b 100644 (file)
--- 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 2112850..9047c2f 100644 (file)
--- 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 453597b..3d6ce6d 100644 (file)
--- 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 0d54650..3ecac01 100644 (file)
--- 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 (file)
index 0000000..96a9d18
--- /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 a969b95..98703d9 100644 (file)
--- 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 2a4a80f..86d8351 100644 (file)
--- 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);
 }

diff --git a/init/Kconfig b/init/Kconfig
index 4e5d96a..7c3c152 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -284,7 +284,7 @@ config AUDIT
 
 config AUDITSYSCALL
        bool "Enable system-call auditing support"
-       depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT))
+       depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT) || ALPHA)
        default y if SECURITY_SELINUX
        help
          Enable low-overhead system-call auditing infrastructure that