^^&&^^

Edit File: sysc_mmap2.stp

%( kernel_v >= "2.6.33" %?
# In newer kernels (2.6.33+), all the sys_mmap() variants are just
# wrappers around sys_mmap_pgoff(), which is in arch-generic code.
#
# long sys_mmap_pgoff(unsigned long addr, unsigned long len,
#		unsigned long prot, unsigned long flags,
#		unsigned long fd, unsigned long pgoff)

@define _SYSCALL_MMAP2_NAME
%(
	name = "mmap2"
%)

@define _SYSCALL_MMAP2_ARGSTR
%(
	argstr = sprintf("%p, %u, %s, %s, %d, %d", start, length,
	                 prot_str, flags_str, fd, pgoffset)
%)

probe syscall.mmap2 = dw_syscall.mmap2 !, nd_syscall.mmap2 ? {}
probe syscall.mmap2.return = dw_syscall.mmap2.return !, nd_syscall.mmap2.return ? {}

# dw_mmap2 _____________________________________________________

probe dw_syscall.mmap2 = kernel.function("sys_mmap_pgoff") ?
{
	@_SYSCALL_MMAP2_NAME
	start = $addr
	length = __ulong($len)
	prot = $prot
	prot_str = _mprotect_prot_str(prot)
	flags = $flags
	flags_str = _mmap_flags(flags)
	# Although the kernel gets an unsigned long fd, on the
	# user-side it is a signed int.  Fix this.
	fd = __int32($fd)
	# $pgoff is the number of pages. Convert this back into a
	# number of bytes.
	pgoffset = $pgoff * @const("PAGE_SIZE")
	@_SYSCALL_MMAP2_ARGSTR
}
probe dw_syscall.mmap2.return = kernel.function("sys_mmap_pgoff").return ?
{
        @_SYSCALL_MMAP2_NAME
        @SYSC_RETVALSTR2($return)
}

# nd_mmap2 _____________________________________________________

probe nd_syscall.mmap2 = nd1_syscall.mmap2!, nd2_syscall.mmap2!, tp_syscall.mmap2
  { }

probe nd1_syscall.mmap2 = kprobe.function("sys_mmap_pgoff") ?
{
	@_SYSCALL_MMAP2_NAME
	asmlinkage()
	start = ulong_arg(1)
	length = ulong_arg(2)
	prot = ulong_arg(3)
	prot_str = _mprotect_prot_str(prot)
	flags = ulong_arg(4)
	flags_str = _mmap_flags(flags)
	# Although the kernel gets an unsigned long fd, on the
	# user-side it is a signed int.  Fix this.
	fd = int_arg(5)
	# $pgoff is the number of pages. Convert this back into a
	# number of bytes.
	pgoffset = ulong_arg(6) * @const("PAGE_SIZE")
	@_SYSCALL_MMAP2_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.mmap2 = __nd2_syscall.mmap, __nd2_syscall.mmap_pgoff
{
}
probe __nd2_syscall.mmap = kprobe.function(@arch_syscall_prefix "sys_mmap") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_MMAP2_NAME
	start = ulong_arg(1)
	length = ulong_arg(2)
	prot = ulong_arg(3)
	prot_str = _mprotect_prot_str(prot)
	flags = ulong_arg(4)
	flags_str = _mmap_flags(flags)
	# Although the kernel gets an unsigned long fd, on the
	# user-side it is a signed int.  Fix this.
	fd = int_arg(5)
	# Here $pgoff is the number of bytes, no conversion needed
	pgoffset = ulong_arg(6)
	@_SYSCALL_MMAP2_ARGSTR
}
probe __nd2_syscall.mmap_pgoff = kprobe.function(@arch_syscall_prefix "sys_mmap_pgoff") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_MMAP2_NAME
	start = ulong_arg(1)
	length = ulong_arg(2)
	prot = ulong_arg(3)
	prot_str = _mprotect_prot_str(prot)
	flags = ulong_arg(4)
	flags_str = _mmap_flags(flags)
	# Although the kernel gets an unsigned long fd, on the
	# user-side it is a signed int.  Fix this.
	fd = int_arg(5)
	# $pgoff is the number of pages. Convert this back into a
	# number of bytes.
	pgoffset = ulong_arg(6) * @const("PAGE_SIZE")
	@_SYSCALL_MMAP2_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.mmap2 = __tp_syscall.mmap, __tp_syscall.mmap_pgoff
{
}
probe __tp_syscall.mmap = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_mmap"))
	@_SYSCALL_MMAP2_NAME
	start = ulong_arg(1)
	length = ulong_arg(2)
	prot = ulong_arg(3)
	prot_str = _mprotect_prot_str(prot)
	flags = ulong_arg(4)
	flags_str = _mmap_flags(flags)
	# Although the kernel gets an unsigned long fd, on the
	# user-side it is a signed int.  Fix this.
	fd = int_arg(5)
	# Here $pgoff is the number of bytes, no conversion needed
	pgoffset = ulong_arg(6)
	@_SYSCALL_MMAP2_ARGSTR
}
probe __tp_syscall.mmap_pgoff = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_mmap2"), @const("__NR_compat_mmap2"))
	@_SYSCALL_MMAP2_NAME
	start = ulong_arg(1)
	length = ulong_arg(2)
	prot = ulong_arg(3)
	prot_str = _mprotect_prot_str(prot)
	flags = ulong_arg(4)
	flags_str = _mmap_flags(flags)
	# Although the kernel gets an unsigned long fd, on the
	# user-side it is a signed int.  Fix this.
	fd = int_arg(5)
	# $pgoff is the number of pages. Convert this back into a
	# number of bytes.
	pgoffset = ulong_arg(6) * @const("PAGE_SIZE")
	@_SYSCALL_MMAP2_ARGSTR
}

probe nd_syscall.mmap2.return = nd1_syscall.mmap2.return!, nd2_syscall.mmap2.return!, tp_syscall.mmap2.return
  { }

probe nd1_syscall.mmap2.return = kprobe.function("sys_mmap_pgoff").return ?
{
        @_SYSCALL_MMAP2_NAME
        @SYSC_RETVALSTR2(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.mmap2.return = kprobe.function(@arch_syscall_prefix "sys_mmap").return ?,
	kprobe.function(@arch_syscall_prefix "sys_mmap_pgoff").return ?
{
	@_SYSCALL_MMAP2_NAME
	@SYSC_RETVALSTR2(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.mmap2.return = __tp_syscall.mmap.return, __tp_syscall.mmap_pgoff.return
{
}
probe __tp_syscall.mmap.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_mmap"))
	@_SYSCALL_MMAP2_NAME
	@SYSC_RETVALSTR2($ret)
}
probe __tp_syscall.mmap_pgoff.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_mmap2"), @const("__NR_compat_mmap2"))
	@_SYSCALL_MMAP2_NAME
	@SYSC_RETVALSTR2($ret)
}
%)