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csky: Update syscall_trace_enter/exit implementation

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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>
This commit is contained in:
Guo Ren
2019-03-20 18:27:27 +08:00
parent cfa4d93b97
commit 2f7932b011
9 changed files with 65 additions and 53 deletions
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46
arch/csky/kernel/ptrace.c
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@@ -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;
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_entry(regs);
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
? 0x80 : 0));
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, syscall_get_nr(current, regs));
/*
* 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;
}
audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
}
regs->regs[SYSTRACE_SAVENUM] = saved_why;
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);
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);