관리-도구

편집 파일: sysc_creat.stp

# creat
# long sys_creat(const char __user * pathname, int mode)

@define _SYSCALL_CREAT_NAME
%(
	name = "creat"
%)

@define _SYSCALL_CREAT_ARGSTR
%(
	argstr = sprintf("%s, %#o", pathname, mode)
%)

@define _SYSCALL_CREAT_REGARGS
%(
	pathname = user_string_quoted(pointer_arg(1))
	mode = uint_arg(2)
%)

probe syscall.creat = dw_syscall.creat !, nd_syscall.creat ? {}
probe syscall.creat.return = dw_syscall.creat.return !, nd_syscall.creat.return ? {}

# dw_creat _____________________________________________________

probe dw_syscall.creat = kernel.function("sys_creat").call ?
{
	@_SYSCALL_CREAT_NAME
	mode = __uint32($mode)
	pathname = user_string_quoted($pathname)
	@_SYSCALL_CREAT_ARGSTR
}
probe dw_syscall.creat.return = kernel.function("sys_creat").return ?
{
	@_SYSCALL_CREAT_NAME
	@SYSC_RETVALSTR($return)
}

# nd_creat _____________________________________________________

probe nd_syscall.creat = nd1_syscall.creat!, nd2_syscall.creat!, tp_syscall.creat
  { }

probe nd1_syscall.creat = kprobe.function("sys_creat") ?
{
	@_SYSCALL_CREAT_NAME
	asmlinkage()
	@_SYSCALL_CREAT_REGARGS
	@_SYSCALL_CREAT_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.creat = kprobe.function(@arch_syscall_prefix "sys_creat") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_CREAT_NAME
	@_SYSCALL_CREAT_REGARGS
	@_SYSCALL_CREAT_ARGSTR
}

/* kernel 3.5+, but undesirable because of it affects all syscalls */
probe tp_syscall.creat = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_creat"), @const("__NR_compat_creat"))
	@_SYSCALL_CREAT_NAME
	@_SYSCALL_CREAT_REGARGS
	@_SYSCALL_CREAT_ARGSTR
}

probe nd_syscall.creat.return = nd1_syscall.creat.return!, nd2_syscall.creat.return!, tp_syscall.creat.return
  { }

probe nd1_syscall.creat.return = kprobe.function("sys_creat").return ?
{
	@_SYSCALL_CREAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.creat.return = kprobe.function(@arch_syscall_prefix "sys_creat").return ?
{
	@_SYSCALL_CREAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because of it affects all syscalls */
probe tp_syscall.creat.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_creat"), @const("__NR_compat_creat"))
	@_SYSCALL_CREAT_NAME
	@SYSC_RETVALSTR($ret)
}