parisc: add kernel audit feature

Implement missing functions for parisc to provide kernel audit feature.

Signed-off-by: Helge Deller <deller@gmx.de>

7 files changed, 157 insertions, 5 deletions

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index ad2ce8dab996..7dcde539d61e 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -287,6 +287,9 @@ config SYSVIPC_COMPAT
         def_bool y
         depends on COMPAT && SYSVIPC
 
+config AUDIT_ARCH
+        def_bool y
+
 config HPUX
         bool "Support for HP-UX binaries"
         depends on !64BIT
diff --git a/arch/parisc/include/asm/ptrace.h b/arch/parisc/include/asm/ptrace.h
index a2db278a5def..3c3cb004b7e2 100644
--- a/arch/parisc/include/asm/ptrace.h
+++ b/arch/parisc/include/asm/ptrace.h
@@ -19,5 +19,9 @@
 #define user_stack_pointer(regs)        ((regs)->gr[30])
 unsigned long profile_pc(struct pt_regs *);
 
+static inline unsigned long regs_return_value(struct pt_regs *regs)
+{
+        return regs->gr[20];
+}
 
 #endif
diff --git a/arch/parisc/include/asm/thread_info.h b/arch/parisc/include/asm/thread_info.h
index 540c88fa8f86..bc7cf120106b 100644
--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -59,6 +59,7 @@ struct thread_info {
 #define TIF_32BIT               4       /* 32 bit binary */
 #define TIF_MEMDIE              5       /* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK     6       /* restore saved signal mask */
+#define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
 #define TIF_NOTIFY_RESUME       8       /* callback before returning to user */
 #define TIF_SINGLESTEP          9       /* single stepping? */
 #define TIF_BLOCKSTEP           10      /* branch stepping? */
@@ -68,6 +69,7 @@ struct thread_info {
 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 #define _TIF_32BIT              (1 << TIF_32BIT)
+#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 #define _TIF_BLOCKSTEP          (1 << TIF_BLOCKSTEP)
@@ -75,7 +77,7 @@ struct thread_info {
 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
                                  _TIF_NEED_RESCHED)
 #define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
-                                 _TIF_BLOCKSTEP)
+                                 _TIF_BLOCKSTEP | _TIF_SYSCALL_AUDIT)
 
 #endif /* __KERNEL__ */
 
diff --git a/arch/parisc/kernel/Makefile b/arch/parisc/kernel/Makefile
index 66ee3f12df58..ff87b4603e3d 100644
--- a/arch/parisc/kernel/Makefile
+++ b/arch/parisc/kernel/Makefile
@@ -29,7 +29,9 @@ obj-$(CONFIG_PCI)	+= pci.o
 obj-$(CONFIG_MODULES)   += module.o
 obj-$(CONFIG_64BIT)     += binfmt_elf32.o sys_parisc32.o signal32.o
 obj-$(CONFIG_STACKTRACE)+= stacktrace.o
+obj-$(CONFIG_AUDIT)     += audit.o
+obj64-$(CONFIG_AUDIT)   += compat_audit.o
 # only supported for PCX-W/U in 64-bit mode at the moment
-obj-$(CONFIG_64BIT)     += perf.o perf_asm.o
+obj-$(CONFIG_64BIT)     += perf.o perf_asm.o $(obj64-y)
 obj-$(CONFIG_FUNCTION_TRACER)           += ftrace.o
 obj-$(CONFIG_FUNCTION_GRAPH_TRACER)     += ftrace.o
diff --git a/arch/parisc/kernel/audit.c b/arch/parisc/kernel/audit.c
new file mode 100644
index 000000000000..eb64a6148c82
--- /dev/null
+++ b/arch/parisc/kernel/audit.c
@@ -0,0 +1,81 @@
+#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)
+{
+#ifdef CONFIG_COMPAT
+        if (arch == AUDIT_ARCH_PARISC)
+                return 1;
+#endif
+        return 0;
+}
+
+int audit_classify_syscall(int abi, unsigned syscall)
+{
+#ifdef CONFIG_COMPAT
+        extern int parisc32_classify_syscall(unsigned);
+        if (abi == AUDIT_ARCH_PARISC)
+                return parisc32_classify_syscall(syscall);
+#endif
+        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)
+{
+#ifdef CONFIG_COMPAT
+        extern __u32 parisc32_dir_class[];
+        extern __u32 parisc32_write_class[];
+        extern __u32 parisc32_read_class[];
+        extern __u32 parisc32_chattr_class[];
+        extern __u32 parisc32_signal_class[];
+        audit_register_class(AUDIT_CLASS_WRITE_32, parisc32_write_class);
+        audit_register_class(AUDIT_CLASS_READ_32, parisc32_read_class);
+        audit_register_class(AUDIT_CLASS_DIR_WRITE_32, parisc32_dir_class);
+        audit_register_class(AUDIT_CLASS_CHATTR_32, parisc32_chattr_class);
+        audit_register_class(AUDIT_CLASS_SIGNAL_32, parisc32_signal_class);
+#endif
+        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/parisc/kernel/compat_audit.c b/arch/parisc/kernel/compat_audit.c
new file mode 100644
index 000000000000..c74478f6bc74
--- /dev/null
+++ b/arch/parisc/kernel/compat_audit.c
@@ -0,0 +1,40 @@
+#include <asm/unistd.h>
+
+unsigned int parisc32_dir_class[] = {
+#include <asm-generic/audit_dir_write.h>
+~0U
+};
+
+unsigned int parisc32_chattr_class[] = {
+#include <asm-generic/audit_change_attr.h>
+~0U
+};
+
+unsigned int parisc32_write_class[] = {
+#include <asm-generic/audit_write.h>
+~0U
+};
+
+unsigned int parisc32_read_class[] = {
+#include <asm-generic/audit_read.h>
+~0U
+};
+
+unsigned int parisc32_signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
+int parisc32_classify_syscall(unsigned syscall)
+{
+        switch (syscall) {
+        case __NR_open:
+                return 2;
+        case __NR_openat:
+                return 3;
+        case __NR_execve:
+                return 5;
+        default:
+                return 1;
+        }
+}
diff --git a/arch/parisc/kernel/ptrace.c b/arch/parisc/kernel/ptrace.c
index 534abd4936e1..e842ee233db4 100644
--- a/arch/parisc/kernel/ptrace.c
+++ b/arch/parisc/kernel/ptrace.c
@@ -19,6 +19,7 @@
 #include <linux/security.h>
 #include <linux/compat.h>
 #include <linux/signal.h>
+#include <linux/audit.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -267,11 +268,28 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 
 long do_syscall_trace_enter(struct pt_regs *regs)
 {
+        long ret = 0;
+
         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
             tracehook_report_syscall_entry(regs))
-                return -1L;
-
-        return regs->gr[20];
+                ret = -1L;
+
+#ifdef CONFIG_64BIT
+        if (!is_compat_task())
+                audit_syscall_entry(AUDIT_ARCH_PARISC64,
+                        regs->gr[20],
+                        regs->gr[26], regs->gr[25],
+                        regs->gr[24], regs->gr[23]);
+        else
+#endif
+                audit_syscall_entry(AUDIT_ARCH_PARISC,
+                        regs->gr[20] & 0xffffffff,
+                        regs->gr[26] & 0xffffffff,
+                        regs->gr[25] & 0xffffffff,
+                        regs->gr[24] & 0xffffffff,
+                        regs->gr[23] & 0xffffffff);
+
+        return ret ? : regs->gr[20];
 }
 
 void do_syscall_trace_exit(struct pt_regs *regs)
@@ -279,6 +297,8 @@ void do_syscall_trace_exit(struct pt_regs *regs)
         int stepping = test_thread_flag(TIF_SINGLESTEP) ||
                 test_thread_flag(TIF_BLOCKSTEP);
 
+        audit_syscall_exit(regs);
+
         if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
                 tracehook_report_syscall_exit(regs, stepping);
 }