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Filename : sysc_mq_unlink.stp
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# mq_unlink __________________________________________________
# long sys_mq_unlink(const char __user *u_name)
#

@define _SYSCALL_MQ_UNLINK_NAME
%(
	name = "mq_unlink"
%)

@define _SYSCALL_MQ_UNLINK_ARGSTR
%(
	argstr = u_name
%)

@define _SYSCALL_MQ_UNLINK_REGARGS
%(
	u_name_uaddr = pointer_arg(1)
	u_name = user_string_quoted(u_name_uaddr)
%)

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

# dw_mq_unlink _____________________________________________________

probe dw_syscall.mq_unlink = kernel.function("sys_mq_unlink").call ?
{
	@_SYSCALL_MQ_UNLINK_NAME
	u_name_uaddr = $u_name
	u_name = user_string_quoted($u_name)
	@_SYSCALL_MQ_UNLINK_ARGSTR
}
probe dw_syscall.mq_unlink.return = kernel.function("sys_mq_unlink").return ?
{
	@_SYSCALL_MQ_UNLINK_NAME
	@SYSC_RETVALSTR($return)
}

# nd_mq_unlink _____________________________________________________

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

probe nd1_syscall.mq_unlink = kprobe.function("sys_mq_unlink") ?
{
	@_SYSCALL_MQ_UNLINK_NAME
	asmlinkage()
	@_SYSCALL_MQ_UNLINK_REGARGS
	@_SYSCALL_MQ_UNLINK_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.mq_unlink = kprobe.function(@arch_syscall_prefix "sys_mq_unlink") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_MQ_UNLINK_NAME
	@_SYSCALL_MQ_UNLINK_REGARGS
	@_SYSCALL_MQ_UNLINK_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.mq_unlink = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_mq_unlink"), @const("__NR_compat_mq_unlink"))
	@_SYSCALL_MQ_UNLINK_NAME
	@_SYSCALL_MQ_UNLINK_REGARGS
	@_SYSCALL_MQ_UNLINK_ARGSTR
}

probe nd_syscall.mq_unlink.return = nd1_syscall.mq_unlink.return!, nd2_syscall.mq_unlink.return!, tp_syscall.mq_unlink.return
  { }
  
probe nd1_syscall.mq_unlink.return = kprobe.function("sys_mq_unlink").return ?
{
	@_SYSCALL_MQ_UNLINK_NAME
	@SYSC_RETVALSTR(returnval())
}

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