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Subject[PATCH v6 2/2] arm64: audit: Add audit hook in ptrace/syscall_trace
Date
This patch adds auditing functions on entry to or exit from
every system call invocation.

Acked-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
arch/arm64/kernel/ptrace.c | 54 ++++++++++++++++++++++++++------------------
1 file changed, 32 insertions(+), 22 deletions(-)

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 6a8928b..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>

@@ -1062,31 +1064,39 @@ asmlinkage int syscall_trace(int dir, struct pt_regs *regs)
{
unsigned long saved_reg;

- if (!test_thread_flag(TIF_SYSCALL_TRACE))
- return regs->syscallno;
+ 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 */
+ saved_reg = regs->regs[12];
+ regs->regs[12] = dir;
+ } else {
+ /*
+ * Save X7. X7 is used to denote syscall entry/exit:
+ * X7 = 0 -> entry, = 1 -> exit
+ */
+ saved_reg = regs->regs[7];
+ regs->regs[7] = dir;
+ }

- if (is_compat_task()) {
- /* AArch32 uses ip (r12) for scratch */
- saved_reg = regs->regs[12];
- regs->regs[12] = dir;
- } else {
- /*
- * Save X7. X7 is used to denote syscall entry/exit:
- * X7 = 0 -> entry, = 1 -> exit
- */
- saved_reg = regs->regs[7];
- regs->regs[7] = dir;
- }
+ if (dir)
+ tracehook_report_syscall_exit(regs, 0);
+ else if (tracehook_report_syscall_entry(regs))
+ regs->syscallno = ~0UL;

- if (dir)
- tracehook_report_syscall_exit(regs, 0);
- else if (tracehook_report_syscall_entry(regs))
- regs->syscallno = ~0UL;
+ if (is_compat_task())
+ regs->regs[12] = saved_reg;
+ else
+ regs->regs[7] = saved_reg;
+ }

- if (is_compat_task())
- regs->regs[12] = saved_reg;
- else
- 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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