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authorGuo Ren <ren_guo@c-sky.com>2019-03-20 18:27:27 +0800
committerGuo Ren <ren_guo@c-sky.com>2019-04-22 13:44:57 +0800
commit2f7932b011e7fb9f98732f95a68f6017d4d8c542 (patch)
tree57fb64c49ac949c030f73871ad8f6b6dc4975a4c /arch/csky/kernel
parentcfa4d93b977a1b1129e7207d11b5daecdf0c56c4 (diff)
downloadlinux-2f7932b011e7fb9f98732f95a68f6017d4d8c542.tar.bz2
csky: Update syscall_trace_enter/exit implementation
Previous syscall_trace implementation couldn't support AUDITSYSCALL and SYSCALL_TRACEPOINTS. Now we redesign it to support audit_syscall and syscall_tracepoints just like other archs'. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Dmitry V. Levin <ldv@altlinux.org> Cc: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/kernel')
-rw-r--r--arch/csky/kernel/entry.S25
-rw-r--r--arch/csky/kernel/ptrace.c50
2 files changed, 35 insertions, 40 deletions
diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S
index 5137ed9062bd..ecc6e7d2e95d 100644
--- a/arch/csky/kernel/entry.S
+++ b/arch/csky/kernel/entry.S
@@ -136,8 +136,9 @@ ENTRY(csky_systemcall)
bmaski r10, THREAD_SHIFT
andn r9, r10
ldw r8, (r9, TINFO_FLAGS)
- btsti r8, TIF_SYSCALL_TRACE
- bt 1f
+ ANDI_R3 r8, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
+ cmpnei r8, 0
+ bt csky_syscall_trace
#if defined(__CSKYABIV2__)
subi sp, 8
stw r5, (sp, 0x4)
@@ -150,10 +151,9 @@ ENTRY(csky_systemcall)
stw a0, (sp, LSAVE_A0) /* Save return value */
jmpi ret_from_exception
-1:
- movi a0, 0 /* enter system call */
- mov a1, sp /* sp = pt_regs pointer */
- jbsr syscall_trace
+csky_syscall_trace:
+ mov a0, sp /* sp = pt_regs pointer */
+ jbsr syscall_trace_enter
/* Prepare args before do system call */
ldw a0, (sp, LSAVE_A0)
ldw a1, (sp, LSAVE_A1)
@@ -173,9 +173,8 @@ ENTRY(csky_systemcall)
#endif
stw a0, (sp, LSAVE_A0) /* Save return value */
- movi a0, 1 /* leave system call */
- mov a1, sp /* right now, sp --> pt_regs */
- jbsr syscall_trace
+ mov a0, sp /* right now, sp --> pt_regs */
+ jbsr syscall_trace_exit
br ret_from_exception
ENTRY(ret_from_kernel_thread)
@@ -191,11 +190,11 @@ ENTRY(ret_from_fork)
andn r9, r10
ldw r8, (r9, TINFO_FLAGS)
movi r11_sig, 1
- btsti r8, TIF_SYSCALL_TRACE
+ ANDI_R3 r8, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
+ cmpnei r8, 0
bf 3f
- movi a0, 1
- mov a1, sp /* sp = pt_regs pointer */
- jbsr syscall_trace
+ mov a0, sp /* sp = pt_regs pointer */
+ jbsr syscall_trace_exit
3:
jbsr ret_from_exception
diff --git a/arch/csky/kernel/ptrace.c b/arch/csky/kernel/ptrace.c
index f2f12fff36f7..91bc74bb569f 100644
--- a/arch/csky/kernel/ptrace.c
+++ b/arch/csky/kernel/ptrace.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+#include <linux/audit.h>
#include <linux/elf.h>
#include <linux/errno.h>
#include <linux/kernel.h>
@@ -11,6 +12,7 @@
#include <linux/sched/task_stack.h>
#include <linux/signal.h>
#include <linux/smp.h>
+#include <linux/tracehook.h>
#include <linux/uaccess.h>
#include <linux/user.h>
@@ -22,6 +24,9 @@
#include <abi/regdef.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
/* sets the trace bits. */
#define TRACE_MODE_SI (1 << 14)
#define TRACE_MODE_RUN 0
@@ -207,35 +212,26 @@ long arch_ptrace(struct task_struct *child, long request,
return ret;
}
-/*
- * If process's system calls is traces, do some corresponding handles in this
- * function before entering system call function and after exiting system call
- * function.
- */
-asmlinkage void syscall_trace(int why, struct pt_regs *regs)
+asmlinkage void syscall_trace_enter(struct pt_regs *regs)
{
- long saved_why;
- /*
- * Save saved_why, why is used to denote syscall entry/exit;
- * why = 0:entry, why = 1: exit
- */
- saved_why = regs->regs[SYSTRACE_SAVENUM];
- regs->regs[SYSTRACE_SAVENUM] = why;
-
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
- ? 0x80 : 0));
-
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_entry(regs);
+
+ if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+ trace_sys_enter(regs, syscall_get_nr(current, regs));
+
+ audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
+}
+
+asmlinkage void syscall_trace_exit(struct pt_regs *regs)
+{
+ audit_syscall_exit(regs);
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, 0);
- regs->regs[SYSTRACE_SAVENUM] = saved_why;
+ if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+ trace_sys_exit(regs, syscall_get_return_value(current, regs));
}
extern void show_stack(struct task_struct *task, unsigned long *stack);