^^&&^^

Edit File: sysc_getuid.stp

# getuid _____________________________________________________
# long sys_getuid(void
# long sys_getuid16(void)
# long sys32_getuid16(void)
#

@define _SYSCALL_GETUID_NAME
%(
	name = "getuid"
%)

@define _SYSCALL_GETUID_ARGSTR
%(
	argstr = ""
%)

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

# dw_getuid _____________________________________________________

probe dw_syscall.getuid = kernel.function("sys_getuid16").call ?,
                       kernel.function("sys32_getuid16").call ?,
%( arch == "s390" %?
                       kernel.function("compat_sys_s390_getuid16").call ?,
%)
                       kernel.function("sys_getuid").call
{
	@_SYSCALL_GETUID_NAME
	@_SYSCALL_GETUID_ARGSTR
}
probe dw_syscall.getuid.return = kernel.function("sys_getuid16").return ?,
	kernel.function("sys32_getuid16").return ?,
%( arch == "s390" %?
	kernel.function("compat_sys_s390_getuid16").return ?,
%)
	kernel.function("sys_getuid").return
{
	@_SYSCALL_GETUID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_getuid _____________________________________________________

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

probe nd1_syscall.getuid = kprobe.function("sys_getuid16") ?,
                           kprobe.function("sys32_getuid16") ?,
%( arch == "s390" %?
                           kprobe.function("compat_sys_s390_getuid16") ?,
%)
                           kprobe.function("sys_getuid")
{
	@_SYSCALL_GETUID_NAME
	@_SYSCALL_GETUID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.getuid = kprobe.function(@arch_syscall0_prefix "sys_getuid") ?,
                           kprobe.function(@arch_syscall0_prefix "sys_getuid16") ?
{
	@_SYSCALL_GETUID_NAME
	@_SYSCALL_GETUID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getuid = __tp_syscall.getuid, __tp_syscall.getuid16
{
	@_SYSCALL_GETUID_NAME
	@_SYSCALL_GETUID_ARGSTR
}
probe __tp_syscall.getuid = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_getuid"), @const("__NR_compat_getuid32"))
}
probe __tp_syscall.getuid16 = kernel.trace("sys_enter")
{
	@__compat_syscall_gate(@const("__NR_compat_getuid"))
}

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

probe nd1_syscall.getuid.return = kprobe.function("sys_getuid16").return ?,
	kprobe.function("sys32_getuid16").return ?,
%( arch == "s390" %?
	kprobe.function("compat_sys_s390_getuid16").return ?,
%)
	kprobe.function("sys_getuid").return
{
	@_SYSCALL_GETUID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.getuid.return =
	kprobe.function(@arch_syscall0_prefix "sys_getuid").return ?,
	kprobe.function(@arch_syscall0_prefix "sys_getuid16").return ?
{
	@_SYSCALL_GETUID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getuid.return = __tp_syscall.getuid.return, __tp_syscall.getuid16.return
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_GETUID_NAME
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.getuid.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_getuid"), @const("__NR_compat_getuid32"))
}
probe __tp_syscall.getuid16.return = kernel.trace("sys_exit")
{
	@__compat_syscall_gate(@const("__NR_compat_getuid"))
}