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# signal _____________________________________________________
# unsigned long sys_signal(int sig, __sighandler_t handler)
#
@define _SYSCALL_SIGNAL_NAME
%(
name = "signal"
%)
@define _SYSCALL_SIGNAL_ARGSTR
%(
argstr = sprintf("%s, %s", sig_str, handler_str)
%)
@define _SYSCALL_SIGNAL_REGARGS
%(
sig = int_arg(1)
sig_str = _signal_name(sig)
handler = pointer_arg(2)
handler_str = _sighandler_str(handler)
%)
probe syscall.signal = dw_syscall.signal !, nd_syscall.signal ? {}
probe syscall.signal.return = dw_syscall.signal.return !,
nd_syscall.signal.return ? {}
# dw_signal _____________________________________________________
probe dw_syscall.signal = kernel.function("sys_signal").call ?
{
@_SYSCALL_SIGNAL_NAME
sig = __int32($sig)
sig_str = _signal_name(sig)
handler = $handler
handler_str = _sighandler_str(handler)
@_SYSCALL_SIGNAL_ARGSTR
}
probe dw_syscall.signal.return = kernel.function("sys_signal").return ?
{
@_SYSCALL_SIGNAL_NAME
@SYSC_RETVALSTR($return)
}
# nd_signal _____________________________________________________
probe nd_syscall.signal = nd1_syscall.signal!, nd2_syscall.signal!, tp_syscall.signal
{ }
probe nd1_syscall.signal = kprobe.function("sys_signal") ?
{
@_SYSCALL_SIGNAL_NAME
asmlinkage()
@_SYSCALL_SIGNAL_REGARGS
@_SYSCALL_SIGNAL_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.signal = kprobe.function(@arch_syscall_prefix "sys_signal") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_SIGNAL_NAME
@_SYSCALL_SIGNAL_REGARGS
@_SYSCALL_SIGNAL_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.signal = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_signal"), @const("__NR_compat_signal"))
@_SYSCALL_SIGNAL_NAME
@_SYSCALL_SIGNAL_REGARGS
@_SYSCALL_SIGNAL_ARGSTR
}
probe nd_syscall.signal.return = nd1_syscall.signal.return!, nd2_syscall.signal.return!, tp_syscall.signal.return
{ }
probe nd1_syscall.signal.return = kprobe.function("sys_signal").return ?
{
@_SYSCALL_SIGNAL_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.signal.return = kprobe.function(@arch_syscall_prefix "sys_signal").return ?
{
@_SYSCALL_SIGNAL_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.signal.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_signal"), @const("__NR_compat_signal"))
@_SYSCALL_SIGNAL_NAME
@SYSC_RETVALSTR($ret)
}
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