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Filename : sysc_setreuid.stp
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# setreuid ___________________________________________________
# long sys_setreuid(uid_t ruid, uid_t euid)
#

@define _SYSCALL_SETREUID_NAME
%(
	name = "setreuid"
%)

@define _SYSCALL_SETREUID_ARGSTR
%(
	argstr = sprintf("%d, %d", ruid, euid)
%)

@define _SYSCALL_GATE
%(
    %( arch == "x86_64" %?
	// There are actually 3 x86_64 setreuid syscall numbers (which
	// get mapped to 2 syscall functions:
	//   - __NR_setreuid which gets mapped to sys_setreuid()
	//   - __NR_ia32_setreuid32 which also gets mapped to
	//     sys_setreuid() 
	//   - __NR_ia32_setreuid which gets mapped to sys_setreuid16()
	//     (which is a wrapper around sys_setreuid())
	// So, we need to avoid sys_setreuid() calls that come from
	// sys_setreuid16().
	@__syscall_compat_gate(@const("__NR_setreuid"),
			       @const("__NR_ia32_setreuid32"))
    %:
	%( arch == "i386" %?
	    // On i386, there are 2 setreuid syscall numbers:
	    //   - __NR_setreuid which gets mapped to sys_setreuid16
	    //   - __NR_setreuid32 which gets mapped to sys_setreuid
	    // Since this gets called from a probe on sys_setreuid, we'll
	    // make sure this is really __NR_setreuid32.
	    @__syscall_nr_gate(@const("__NR_setreuid32"))
	%)
    %)
%)

@define _SYSCALL_SETREUID_REGARGS
%(
	ruid = __int32(uint_arg(1))
	euid = __int32(uint_arg(2))
%)

@define _SYSCALL_SETREUID16_REGARGS
%(
	ruid = __short(uint_arg(1))
	euid = __short(uint_arg(2))
%)

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

# dw_setreuid _____________________________________________________

probe dw_syscall.setreuid = kernel.function("sys_setreuid").call
{
	@_SYSCALL_GATE
	@_SYSCALL_SETREUID_NAME
	ruid = __int32($ruid)
	euid = __int32($euid)
	@_SYSCALL_SETREUID_ARGSTR
}
probe dw_syscall.setreuid.return = kernel.function("sys_setreuid").return
{
	@_SYSCALL_GATE
	@_SYSCALL_SETREUID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_setreuid _____________________________________________________

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

probe nd1_syscall.setreuid = kprobe.function("sys_setreuid") ?
{
	@_SYSCALL_GATE
	@_SYSCALL_SETREUID_NAME
	asmlinkage()
	@_SYSCALL_SETREUID_REGARGS
	@_SYSCALL_SETREUID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.setreuid = kprobe.function(@arch_syscall_prefix "sys_setreuid") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SETREUID_NAME
	@_SYSCALL_SETREUID_REGARGS
	@_SYSCALL_SETREUID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setreuid = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setreuid"), @const("__NR_compat_setreuid32"))
	@_SYSCALL_SETREUID_NAME
	@_SYSCALL_SETREUID_REGARGS
	@_SYSCALL_SETREUID_ARGSTR
}

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

probe nd1_syscall.setreuid.return = kprobe.function("sys_setreuid").return ?
{
	@_SYSCALL_GATE
	@_SYSCALL_SETREUID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.setreuid.return = kprobe.function(@arch_syscall_prefix "sys_setreuid").return ?
{
	@_SYSCALL_SETREUID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setreuid.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setreuid"), @const("__NR_compat_setreuid32"))
	@_SYSCALL_SETREUID_NAME
	@SYSC_RETVALSTR($ret)
}

# setreuid16 _________________________________________________
# long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
#

probe syscall.setreuid16 = dw_syscall.setreuid16 !, nd_syscall.setreuid16 ? {}
probe syscall.setreuid16.return = dw_syscall.setreuid16.return !,
                                  nd_syscall.setreuid16.return ? {}

# dw_setreuid16 _____________________________________________________

probe dw_syscall.setreuid16 = kernel.function("sys_setreuid16").call ?
{
	@_SYSCALL_SETREUID_NAME
	ruid = __short($ruid)
	euid = __short($euid)
	@_SYSCALL_SETREUID_ARGSTR
}
probe dw_syscall.setreuid16.return = kernel.function("sys_setreuid16").return ?
{
	@_SYSCALL_SETREUID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_setreuid16 _____________________________________________________

probe nd_syscall.setreuid16 = nd1_syscall.setreuid16!, nd2_syscall.setreuid16!, tp_syscall.setreuid16
  { }

probe nd1_syscall.setreuid16 = kprobe.function("sys_setreuid16") ?
{
	@_SYSCALL_SETREUID_NAME
	asmlinkage()
	@_SYSCALL_SETREUID16_REGARGS
	@_SYSCALL_SETREUID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.setreuid16 = kprobe.function(@arch_syscall_prefix "sys_setreuid16") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SETREUID_NAME
	@_SYSCALL_SETREUID16_REGARGS
	@_SYSCALL_SETREUID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setreuid16 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_setreuid"))
	@_SYSCALL_SETREUID_NAME
	@_SYSCALL_SETREUID16_REGARGS
	@_SYSCALL_SETREUID_ARGSTR
}

probe nd_syscall.setreuid16.return = nd1_syscall.setreuid16.return!, nd2_syscall.setreuid16.return!, tp_syscall.setreuid16.return
  { }

probe nd1_syscall.setreuid16.return = kprobe.function("sys_setreuid16").return ?
{
	@_SYSCALL_SETREUID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.setreuid16.return = kprobe.function(@arch_syscall_prefix "sys_setreuid16").return ?
{
	@_SYSCALL_SETREUID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setreuid16.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_setreuid"))
	@_SYSCALL_SETREUID_NAME
	@SYSC_RETVALSTR($ret)
}