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Filename : sysc_mprotect.stp
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# mprotect ___________________________________________________
# long sys_mprotect(unsigned long start, size_t len, unsigned long prot)
#

@define _SYSCALL_MPROTECT_NAME
%(
	name = "mprotect"
%)

@define _SYSCALL_MPROTECT_ARGSTR
%(
	argstr = sprintf("%p, %d, %s", addr, len, prot_str)
%)

@define _SYSCALL_MPROTECT_REGARGS
%(
	addr = ulong_arg(1)
	len = ulong_arg(2)
	prot = ulong_arg(3)
	prot_str = _mprotect_prot_str(prot)
%)

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

# dw_mprotect _____________________________________________________

probe dw_syscall.mprotect = kernel.function("sys_mprotect").call ?
{
	@_SYSCALL_MPROTECT_NAME
	addr = $start
	len = $len
	prot = $prot
	prot_str = _mprotect_prot_str(prot)
	@_SYSCALL_MPROTECT_ARGSTR
}
probe dw_syscall.mprotect.return = kernel.function("sys_mprotect").return ?
{
	@_SYSCALL_MPROTECT_NAME
	@SYSC_RETVALSTR($return)
}

# nd_mprotect _____________________________________________________

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

probe nd1_syscall.mprotect = kprobe.function("sys_mprotect") ?
{
	@_SYSCALL_MPROTECT_NAME
	asmlinkage()
	@_SYSCALL_MPROTECT_REGARGS
	@_SYSCALL_MPROTECT_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.mprotect = kprobe.function(@arch_syscall_prefix "sys_mprotect") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_MPROTECT_NAME
	@_SYSCALL_MPROTECT_REGARGS
	@_SYSCALL_MPROTECT_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.mprotect = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_mprotect"), @const("__NR_compat_mprotect"))
	@_SYSCALL_MPROTECT_NAME
	@_SYSCALL_MPROTECT_REGARGS
	@_SYSCALL_MPROTECT_ARGSTR
}

probe nd_syscall.mprotect.return = nd1_syscall.mprotect.return!, nd2_syscall.mprotect.return!, tp_syscall.mprotect.return
  { }
  
probe nd1_syscall.mprotect.return = kprobe.function("sys_mprotect").return ?
{
	@_SYSCALL_MPROTECT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.mprotect.return = kprobe.function(@arch_syscall_prefix "sys_mprotect").return ?
{
	@_SYSCALL_MPROTECT_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.mprotect.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_mprotect"), @const("__NR_compat_mprotect"))
	@_SYSCALL_MPROTECT_NAME
	@SYSC_RETVALSTR($ret)
}