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Filename : sysc_setresgid.stp
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# setresgid __________________________________________________
# long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
#

@define _SYSCALL_SETRESGID_NAME
%(
	name = "setresgid"
%)

@define _SYSCALL_SETRESGID_ARGSTR
%(
	argstr = sprintf("%d, %d, %d", rgid, egid, sgid)
%)

@define _SYSCALL_GATE
%(
    %( arch == "x86_64" %?
	// There are actually 3 x86_64 setresgid syscalls numbers (which
	// get mapped to 2 syscall functions:
	//   - __NR_setresgid which gets mapped to sys_setresgid()
	//   - __NR_ia32_setresgid32 which also gets mapped to
	//     sys_setresgid() 
	//   - __NR_ia32_setresgid which gets mapped to sys_setresgid16()
	//     (which is a wrapper around sys_setresgid())
	// So, we need to avoid sys_setresgid() calls that come from
	// sys_setresgid16().
	@__syscall_compat_gate(@const("__NR_setresgid"),
			       @const("__NR_ia32_setresgid32"))
    %:
	%( arch == "i386" %?
	    // On i386, there are 2 setresgid syscall numbers:
	    //   - __NR_setresgid which gets mapped to sys_setresgid16
	    //   - __NR_setresgid32 which gets mapped to sys_setresgid
	    // Since this gets called from a probe on sys_setresgid, we'll
	    // make sure this is really __NR_setresgid32.
	    @__syscall_nr_gate(@const("__NR_setresgid32"))
	%)
    %)
%)

@define _SYSCALL_SETRESGID_REGARGS
%(
	rgid = __int32(uint_arg(1))
	egid = __int32(uint_arg(2))
	sgid = __int32(uint_arg(3))
%)

@define _SYSCALL_SETRESGID16_REGARGS
%(
	rgid = __short(uint_arg(1))
	egid = __short(uint_arg(2))
	sgid = __short(uint_arg(3))
%)

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

# dw_setresgid _____________________________________________________

probe dw_syscall.setresgid = kernel.function("sys_setresgid").call
{
	@_SYSCALL_GATE
	@_SYSCALL_SETRESGID_NAME
	rgid = __int32($rgid)
	egid = __int32($egid)
	sgid = __int32($sgid)
	@_SYSCALL_SETRESGID_ARGSTR
}
probe dw_syscall.setresgid.return = kernel.function("sys_setresgid").return
{
	@_SYSCALL_GATE
	@_SYSCALL_SETRESGID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_setresgid _____________________________________________________

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

probe nd1_syscall.setresgid = kprobe.function("sys_setresgid") ?
{
	@_SYSCALL_GATE
	@_SYSCALL_SETRESGID_NAME
	asmlinkage()
	@_SYSCALL_SETRESGID_REGARGS
	@_SYSCALL_SETRESGID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.setresgid = kprobe.function(@arch_syscall_prefix "sys_setresgid") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SETRESGID_NAME
	@_SYSCALL_SETRESGID_REGARGS
	@_SYSCALL_SETRESGID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setresgid = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setresgid"), @const("__NR_compat_setresgid32"))
	@_SYSCALL_SETRESGID_NAME
	@_SYSCALL_SETRESGID_REGARGS
	@_SYSCALL_SETRESGID_ARGSTR
}

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

probe nd1_syscall.setresgid.return = kprobe.function("sys_setresgid").return ?
{
	@_SYSCALL_GATE
	@_SYSCALL_SETRESGID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.setresgid.return = kprobe.function(@arch_syscall_prefix "sys_setresgid").return ?
{
	@_SYSCALL_SETRESGID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setresgid.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setresgid"), @const("__NR_compat_setresgid32"))
	@_SYSCALL_SETRESGID_NAME
	@SYSC_RETVALSTR($ret)
}

# setresgid16 ________________________________________________
#
# long sys_setresgid16(old_gid_t rgid,
#		     old_gid_t egid,
#		     old_gid_t sgid)
#

probe syscall.setresgid16 = dw_syscall.setresgid16 !, nd_syscall.setresgid16 ? {}
probe syscall.setresgid16.return = dw_syscall.setresgid16.return !,
                                   nd_syscall.setresgid16.return ? {}

# dw_setresgid16 _____________________________________________________

probe dw_syscall.setresgid16 = kernel.function("sys_setresgid16").call ?
{
	@_SYSCALL_SETRESGID_NAME
	rgid = __short($rgid)
	egid = __short($egid)
	sgid = __short($sgid)
	@_SYSCALL_SETRESGID_ARGSTR
}
probe dw_syscall.setresgid16.return = kernel.function("sys_setresgid16").return ?
{
	@_SYSCALL_SETRESGID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_setresgid16 _____________________________________________________

probe nd_syscall.setresgid16 = nd1_syscall.setresgid16!, nd2_syscall.setresgid16!, tp_syscall.setresgid16
  { }

probe nd1_syscall.setresgid16 = kprobe.function("sys_setresgid16") ?
{
	@_SYSCALL_SETRESGID_NAME
	asmlinkage()
	@_SYSCALL_SETRESGID_REGARGS
	@_SYSCALL_SETRESGID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.setresgid16 = kprobe.function(@arch_syscall_prefix "sys_setresgid16") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SETRESGID_NAME
	@_SYSCALL_SETRESGID16_REGARGS
	@_SYSCALL_SETRESGID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setresgid16 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_setresgid"))
	@_SYSCALL_SETRESGID_NAME
	@_SYSCALL_SETRESGID16_REGARGS
	@_SYSCALL_SETRESGID_ARGSTR
}

probe nd_syscall.setresgid16.return = nd1_syscall.setresgid16.return!, nd2_syscall.setresgid16.return!, tp_syscall.setresgid16.return
  { }

probe nd1_syscall.setresgid16.return = kprobe.function("sys_setresgid16").return ?
{
	@_SYSCALL_SETRESGID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.setresgid16.return =
	kprobe.function(@arch_syscall_prefix "sys_setresgid16").return ?
{
	@_SYSCALL_SETRESGID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setresgid16.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_setresgid"))
	@_SYSCALL_SETRESGID_NAME
	@SYSC_RETVALSTR($ret)
}