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Filename : sysc_setrlimit.stp
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# setrlimit __________________________________________________
#
# asmlinkage long
# sys_setrlimit(unsigned int resource,
#               struct rlimit __user *rlim)
# asmlinkage long
# compat_sys_setrlimit(unsigned int resource,
#                      struct compat_rlimit __user *rlim)
#

@define _SYSCALL_SETRLIMIT_NAME
%(
	name = "setrlimit"
%)

@define _SYSCALL_SETRLIMIT_ARGSTR
%(
	argstr = sprintf("%s, %s", resource_str, rlim_str)
%)

@define _SYSCALL_SETRLIMIT_REGARGS
%(
	resource = uint_arg(1)
	resource_str = _rlimit_resource_str(resource)
	rlim_uaddr = pointer_arg(2)
	rlim_str = _struct_rlimit_u(rlim_uaddr)
%)

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

# dw_setrlimit _____________________________________________________

probe dw_syscall.setrlimit = __syscall.setrlimit ?,
	kernel.function("compat_sys_setrlimit").call ?
{
	@_SYSCALL_SETRLIMIT_NAME
	resource = $resource
	resource_str = _rlimit_resource_str(resource)
	rlim_uaddr = $rlim
	rlim_str = _struct_rlimit_u(rlim_uaddr)
	@_SYSCALL_SETRLIMIT_ARGSTR
}
probe __syscall.setrlimit = kernel.function("sys_setrlimit").call
{
	@__syscall_gate(@const("__NR_setrlimit"))
}
probe dw_syscall.setrlimit.return = __syscall.setrlimit.return ?,
	kernel.function("compat_sys_setrlimit").return ?
{
	@_SYSCALL_SETRLIMIT_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.setrlimit.return = kernel.function("sys_setrlimit").return
{
	@__syscall_gate(@const("__NR_setrlimit"))
}

# nd_setrlimit _____________________________________________________

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

probe nd1_syscall.setrlimit = __nd1_syscall.setrlimit ?,
	kprobe.function("compat_sys_setrlimit") ?
{
	@_SYSCALL_SETRLIMIT_NAME
	asmlinkage()
	@_SYSCALL_SETRLIMIT_REGARGS
	@_SYSCALL_SETRLIMIT_ARGSTR
}
probe __nd1_syscall.setrlimit = kprobe.function("sys_setrlimit")
{
	@__syscall_gate(@const("__NR_setrlimit"))
}

/* kernel 4.17+ */
probe nd2_syscall.setrlimit =
	kprobe.function(@arch_syscall_prefix "sys_setrlimit") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_setrlimit") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SETRLIMIT_NAME
	@_SYSCALL_SETRLIMIT_REGARGS
	@_SYSCALL_SETRLIMIT_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setrlimit = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setrlimit"), @const("__NR_compat_setrlimit"))
	@_SYSCALL_SETRLIMIT_NAME
	@_SYSCALL_SETRLIMIT_REGARGS
	@_SYSCALL_SETRLIMIT_ARGSTR
}

probe nd_syscall.setrlimit.return = nd1_syscall.setrlimit.return!, nd2_syscall.setrlimit.return!, tp_syscall.setrlimit.return
  { }
  
probe nd1_syscall.setrlimit.return = __nd1_syscall.setrlimit.return ?,
	kprobe.function("compat_sys_setrlimit").return ?
{
	@_SYSCALL_SETRLIMIT_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.setrlimit.return = kprobe.function("sys_setrlimit").return
{
	@__syscall_gate(@const("__NR_setrlimit"))
}

/* kernel 4.17+ */
probe nd2_syscall.setrlimit.return =
	kprobe.function(@arch_syscall_prefix "sys_setrlimit").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_setrlimit").return ?
{
	@_SYSCALL_SETRLIMIT_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setrlimit.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setrlimit"), @const("__NR_compat_setrlimit"))
	@_SYSCALL_SETRLIMIT_NAME
	@SYSC_RETVALSTR($ret)
}