[PATCH v5 3/3] arm64: audit: Add audit hook in ptrace/syscall_trace

[AKASHI Takahiro]

This patch adds auditing functions on entry to or exit from
every system call invocation.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Acked-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
---
 arch/arm64/kernel/ptrace.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index c70133e..d4ce70e 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/audit.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
@@ -38,6 +39,7 @@
 #include <asm/compat.h>
 #include <asm/debug-monitors.h>
 #include <asm/pgtable.h>
+#include <asm/syscall.h>
 #include <asm/traps.h>
 #include <asm/system_misc.h>
 
@@ -1062,6 +1064,9 @@ asmlinkage int syscall_trace(int dir, struct pt_regs *regs)
 {
 	unsigned long saved_reg;
 
+	if (dir && test_thread_flag(TIF_SYSCALL_AUDIT))
+		audit_syscall_exit(regs);
+
 	if (test_thread_flag(TIF_SYSCALL_TRACE)) {
 		if (is_compat_task()) {
 			/* AArch32 uses ip (r12) for scratch */
@@ -1087,5 +1092,11 @@ asmlinkage int syscall_trace(int dir, struct pt_regs *regs)
 			regs->regs[7] = saved_reg;
 	}
 
+	if (!dir && test_thread_flag(TIF_SYSCALL_AUDIT))
+		audit_syscall_entry(syscall_get_arch(current, regs),
+			(int)regs->syscallno,
+			regs->orig_x0, regs->regs[1],
+			regs->regs[2], regs->regs[3]);
+
 	return regs->syscallno;
 }
-- 
1.7.9.5

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