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# userfaultfd ________________________________________________
# SYSCALL_DEFINE2(userfaultfd, int, flags)
@define _SYSCALL_USERFAULTFD_NAME
%(
name = "userfaultfd"
%)
@define _SYSCALL_USERFAULTFD_ARGSTR
%(
argstr = sprintf("%s", flags_str)
%)
@define _SYSCALL_USERFAULTFD_REGARGS
%(
flags = int_arg(1)
flags_str = _userfaultfd_flags_str(flags)
%)
@define _SYSCALL_USERFAULTFD_REGARGS_STORE
%(
if (@probewrite(flags))
set_int_arg(1, flags)
%)
probe syscall.userfaultfd = dw_syscall.userfaultfd !, nd_syscall.userfaultfd ? {}
probe syscall.userfaultfd.return = dw_syscall.userfaultfd.return !,
nd_syscall.userfaultfd.return ? {}
# dw_userfaultfd _____________________________________________________
probe dw_syscall.userfaultfd = kernel.function("sys_userfaultfd").call ?
{
@_SYSCALL_USERFAULTFD_NAME
flags = __int32($flags)
flags_str = _userfaultfd_flags_str(flags)
@_SYSCALL_USERFAULTFD_ARGSTR
}
probe dw_syscall.userfaultfd.return = kernel.function("sys_userfaultfd").return ?
{
@_SYSCALL_USERFAULTFD_NAME
@SYSC_RETVALSTR($return)
}
# nd_userfaultfd _____________________________________________________
probe nd_syscall.userfaultfd = nd1_syscall.userfaultfd!, nd2_syscall.userfaultfd!, tp_syscall.userfaultfd
{ }
probe nd1_syscall.userfaultfd = kprobe.function("sys_userfaultfd").call ?
{
@_SYSCALL_USERFAULTFD_NAME
asmlinkage()
@_SYSCALL_USERFAULTFD_REGARGS
@_SYSCALL_USERFAULTFD_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.userfaultfd =
kprobe.function(@arch_syscall_prefix "sys_userfaultfd") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_USERFAULTFD_NAME
@_SYSCALL_USERFAULTFD_REGARGS
@_SYSCALL_USERFAULTFD_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_USERFAULTFD_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.userfaultfd = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_userfaultfd"),
@const("__NR_compat_userfaultfd"))
@_SYSCALL_USERFAULTFD_NAME
@_SYSCALL_USERFAULTFD_REGARGS
@_SYSCALL_USERFAULTFD_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_USERFAULTFD_REGARGS_STORE %)
}
probe nd_syscall.userfaultfd.return = nd1_syscall.userfaultfd.return!, nd2_syscall.userfaultfd.return!, tp_syscall.userfaultfd.return
{ }
probe nd1_syscall.userfaultfd.return =
kprobe.function("sys_userfaultfd").return ?
{
@_SYSCALL_USERFAULTFD_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.userfaultfd.return =
kprobe.function(@arch_syscall_prefix "sys_userfaultfd").return ?
{
@_SYSCALL_USERFAULTFD_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.userfaultfd.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_userfaultfd"),
@const("__NR_compat_userfaultfd"))
@_SYSCALL_USERFAULTFD_NAME
@SYSC_RETVALSTR($ret)
}
|
