arm64: make a single hook to syscall_trace() for all syscall features

Currently syscall_trace() is called only for ptrace.
With additional TIF_xx flags defined, it is now called in all the cases
of audit, ftrace and seccomp in addition to ptrace.

Acked-by: Richard Guy Briggs <rgb@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 720e70b..0a8b2a9 100644 (file)
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -91,6 +91,9 @@ static inline struct thread_info *current_thread_info(void)
 /*
  * thread information flags:
  *  TIF_SYSCALL_TRACE  - syscall trace active
+ *  TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
+ *  TIF_SYSCALL_AUDIT  - syscall auditing
+ *  TIF_SECOMP         - syscall secure computing
  *  TIF_SIGPENDING     - signal pending
  *  TIF_NEED_RESCHED   - rescheduling necessary
  *  TIF_NOTIFY_RESUME  - callback before returning to user
@@ -101,6 +104,9 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_NEED_RESCHED       1
 #define TIF_NOTIFY_RESUME      2       /* callback before returning to user */
 #define TIF_SYSCALL_TRACE      8
+#define TIF_SYSCALL_AUDIT      9
+#define TIF_SYSCALL_TRACEPOINT 10
+#define TIF_SECCOMP            11
 #define TIF_POLLING_NRFLAG     16
 #define TIF_MEMDIE             18      /* is terminating due to OOM killer */
 #define TIF_FREEZE             19
@@ -112,10 +118,17 @@ static inline struct thread_info *current_thread_info(void)
 #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_TRACE     (1 << TIF_SYSCALL_TRACE)
+#define _TIF_SYSCALL_AUDIT     (1 << TIF_SYSCALL_AUDIT)
+#define _TIF_SYSCALL_TRACEPOINT        (1 << TIF_SYSCALL_TRACEPOINT)
+#define _TIF_SECCOMP           (1 << TIF_SECCOMP)
 #define _TIF_32BIT             (1 << TIF_32BIT)
 
 #define _TIF_WORK_MASK         (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
                                 _TIF_NOTIFY_RESUME)
 
+#define _TIF_SYSCALL_WORK      (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
+                                _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
+
 #endif /* __KERNEL__ */
 #endif /* __ASM_THREAD_INFO_H */

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index e8b23a3..be95f35 100644 (file)
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -610,8 +610,9 @@ el0_svc_naked:                                      // compat entry point
        stp     x0, scno, [sp, #S_ORIG_X0]      // save the original x0 and syscall number
        enable_dbg_and_irq
 
-       ldr     x16, [tsk, #TI_FLAGS]           // check for syscall tracing
-       tbnz    x16, #TIF_SYSCALL_TRACE, __sys_trace // are we tracing syscalls?
+       ldr     x16, [tsk, #TI_FLAGS]           // check for syscall hooks
+       tst     x16, #_TIF_SYSCALL_WORK
+       b.ne    __sys_trace
        adr     lr, ret_fast_syscall            // return address
        cmp     scno, sc_nr                     // check upper syscall limit
        b.hs    ni_sys