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Filename : sysc_chown16.stp
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# chown16 ___________________________________________________
# long sys_chown16(const char __user * filename, old_uid_t user,
#			old_gid_t group)
#

@define _SYSCALL_CHOWN16_NAME
%(
	name = "chown16"
%)

@define _SYSCALL_CHOWN16_ARGSTR
%(
	argstr = sprintf("%s, %d, %d", path, owner, group)
%)

@define _SYSCALL_CHOWN16_REGARGS
%(
	path = user_string_quoted(pointer_arg(1))
	owner = __short(uint_arg(2))
	group = __short(uint_arg(3))
%)

probe syscall.chown16 = dw_syscall.chown16 !, nd_syscall.chown16 ? {}
probe syscall.chown16.return = dw_syscall.chown16.return !, nd_syscall.chown16.return ? {}

# dw_chown16 _____________________________________________________

probe dw_syscall.chown16 = kernel.function("sys_chown16").call ?
{
	@_SYSCALL_CHOWN16_NAME
	path = user_string_quoted($filename)
	owner = __short($user)
	group = __short($group)
	@_SYSCALL_CHOWN16_ARGSTR
}
probe dw_syscall.chown16.return = kernel.function("sys_chown16").return ?
{
	@_SYSCALL_CHOWN16_NAME
	@SYSC_RETVALSTR($return)
}

# nd_chown16 _____________________________________________________

probe nd_syscall.chown16 = nd1_syscall.chown16!, nd2_syscall.chown16!, tp_syscall.chown16
  { }

probe nd1_syscall.chown16 = kprobe.function("sys_chown16") ?
{
	@_SYSCALL_CHOWN16_NAME
	asmlinkage()
	@_SYSCALL_CHOWN16_REGARGS
	@_SYSCALL_CHOWN16_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.chown16 = kprobe.function(@arch_syscall_prefix "sys_chown16") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_CHOWN16_NAME
	@_SYSCALL_CHOWN16_REGARGS
	@_SYSCALL_CHOWN16_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.chown16 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
%( CONFIG_64BIT == "y" %?
	@__compat_syscall_gate(@const("__NR_compat_chown"))
%:
	@__syscall_gate(@const("__NR_chown"))
%)
	@_SYSCALL_CHOWN16_NAME
	@_SYSCALL_CHOWN16_REGARGS
	@_SYSCALL_CHOWN16_ARGSTR
}

probe nd_syscall.chown16.return = nd1_syscall.chown16.return!, nd2_syscall.chown16.return!, tp_syscall.chown16.return
  { }
  
probe nd1_syscall.chown16.return = kprobe.function("sys_chown16").return ?
{
	@_SYSCALL_CHOWN16_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.chown16.return = kprobe.function(@arch_syscall_prefix "sys_chown16").return ?
{
	@_SYSCALL_CHOWN16_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.chown16.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
%( CONFIG_64BIT == "y" %?
	@__compat_syscall_gate(@const("__NR_compat_chown"))
%:
	@__syscall_gate(@const("__NR_chown"))
%)
	@_SYSCALL_CHOWN16_NAME
	@SYSC_RETVALSTR($ret)
}