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: / usr / share / systemtap / tapset / linux /
Filename : sysc_setns.stp
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# setns ______________________________________________________
# SYSCALL_DEFINE2(setns, int, fd, int, nstype)

@define _SYSCALL_SETNS_NAME
%(
	name = "setns"
%)

@define _SYSCALL_SETNS_ARGSTR
%(
	argstr = sprintf("%d, %s", fd, nstype_str);
%)

@define _SYSCALL_SETNS_REGARGS
%(
	fd = int_arg(1)
	nstype = int_arg(2)
	nstype_str = __fork_flags(nstype)
%)

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

# dw_setns _____________________________________________________

probe dw_syscall.setns = kernel.function("sys_setns") ?
{
	@_SYSCALL_SETNS_NAME
	fd = __int32($fd)
	nstype = __int32($nstype)
	nstype_str = __fork_flags(nstype)
	@_SYSCALL_SETNS_ARGSTR
}
probe dw_syscall.setns.return = kernel.function("sys_setns").return ?
{
	@_SYSCALL_SETNS_NAME
	@SYSC_RETVALSTR($return)
}

# nd_setns _____________________________________________________

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

probe nd1_syscall.setns = kprobe.function("sys_setns") ?
{
	@_SYSCALL_SETNS_NAME
	asmlinkage()
	@_SYSCALL_SETNS_REGARGS
        @_SYSCALL_SETNS_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.setns = kprobe.function(@arch_syscall_prefix "sys_setns") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SETNS_NAME
	@_SYSCALL_SETNS_REGARGS
	@_SYSCALL_SETNS_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setns = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setns"), @const("__NR_compat_setns"))
	@_SYSCALL_SETNS_NAME
	@_SYSCALL_SETNS_REGARGS
	@_SYSCALL_SETNS_ARGSTR
}

probe nd_syscall.setns.return = nd1_syscall.setns.return!, nd2_syscall.setns.return!, tp_syscall.setns.return
  { }
  
probe nd1_syscall.setns.return = kprobe.function("sys_setns").return ?
{
	@_SYSCALL_SETNS_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.setns.return = kprobe.function(@arch_syscall_prefix "sys_setns").return ?
{
	@_SYSCALL_SETNS_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setns.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setns"), @const("__NR_compat_setns"))
	@_SYSCALL_SETNS_NAME
	@SYSC_RETVALSTR($ret)
}