^^&&^^

Edit File: sysc_getresgid.stp

# getresgid __________________________________________________
# long sys_getresgid(gid_t __user *rgid,
#                    gid_t __user *egid,
#                    gid_t __user *sgid)
# long sys_getresgid16(old_uid_t __user *rgid,
#                 old_uid_t __user *egid,
#                 old_uid_t __user *sgid)

@define _SYSCALL_GETRESGID_NAME
%(
	name = "getresgid"
%)

@define _SYSCALL_GETRESGID_ARGSTR
%(
	argstr = sprintf("%p, %p, %p", rgid_uaddr, egid_uaddr, sgid_uaddr)
%)

@define _SYSCALL_GETRESGID_REGARGS
%(
	rgid_uaddr = pointer_arg(1)
	egid_uaddr = pointer_arg(2)
	sgid_uaddr = pointer_arg(3)
%)

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

# dw_getresgid _____________________________________________________

probe dw_syscall.getresgid = kernel.function("sys_getresgid16").call ?,
                          kernel.function("sys_getresgid").call
{
	@_SYSCALL_GETRESGID_NAME
	rgid_uaddr = @choose_defined($rgidp, $rgid)
	egid_uaddr = @choose_defined($egidp, $egid)
	sgid_uaddr = @choose_defined($sgidp, $sgid)
	@_SYSCALL_GETRESGID_ARGSTR
}
probe dw_syscall.getresgid.return = kernel.function("sys_getresgid16").return ?,
                                 kernel.function("sys_getresgid").return
{
	@_SYSCALL_GETRESGID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_getresgid _____________________________________________________

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

probe nd1_syscall.getresgid = kprobe.function("sys_getresgid16") ?,
                              kprobe.function("sys_getresgid") ?
{
	@_SYSCALL_GETRESGID_NAME
	asmlinkage()
	@_SYSCALL_GETRESGID_REGARGS
	@_SYSCALL_GETRESGID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.getresgid = kprobe.function(@arch_syscall_prefix "sys_getresgid") ?,
                              kprobe.function(@arch_syscall_prefix "sys_getresgid16") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_GETRESGID_NAME
	@_SYSCALL_GETRESGID_REGARGS
	@_SYSCALL_GETRESGID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getresgid = __tp_syscall.getresgid, __tp_syscall.getresgid16
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_GETRESGID_NAME
	@_SYSCALL_GETRESGID_REGARGS
	@_SYSCALL_GETRESGID_ARGSTR
}
probe __tp_syscall.getresgid = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_getresgid"), @const("__NR_compat_getresgid32"))
}
probe __tp_syscall.getresgid16 = kernel.trace("sys_enter")
{
	@__compat_syscall_gate(@const("__NR_compat_getresgid"))
}

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

probe nd1_syscall.getresgid.return = kprobe.function("sys_getresgid16").return ?,
                                     kprobe.function("sys_getresgid").return ?
{
	@_SYSCALL_GETRESGID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.getresgid.return =
	kprobe.function(@arch_syscall_prefix "sys_getresgid").return ?,
	kprobe.function(@arch_syscall_prefix "sys_getresgid16").return ?
{
	@_SYSCALL_GETRESGID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getresgid.return = __tp_syscall.getresgid.return, __tp_syscall.getresgid16.return
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_GETRESGID_NAME
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.getresgid.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_getresgid"), @const("__NR_compat_getresgid32"))
}
probe __tp_syscall.getresgid16.return = kernel.trace("sys_exit")
{
	@__compat_syscall_gate(@const("__NR_compat_getresgid"))
}