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# modify_ldt _________________________________________________
# int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
#
@define _SYSCALL_MODIFY_LDT_NAME
%(
name = "modify_ldt"
%)
@define _SYSCALL_MODIFY_LDT_ARGSTR
%(
argstr = sprintf("%d, %p, %u", func, ptr_uaddr, bytecount)
%)
@define _SYSCALL_MODIFY_LDT_REGARGS
%(
func = int_arg(1)
ptr_uaddr = pointer_arg(2)
bytecount = ulong_arg(3)
%)
probe syscall.modify_ldt = dw_syscall.modify_ldt !, nd_syscall.modify_ldt ? {}
probe syscall.modify_ldt.return = dw_syscall.modify_ldt.return !,
nd_syscall.modify_ldt.return ? {}
# dw_modify_ldt _____________________________________________________
probe dw_syscall.modify_ldt = kernel.function("sys_modify_ldt").call ?
{
@_SYSCALL_MODIFY_LDT_NAME
func = __int32($func)
ptr_uaddr = $ptr
bytecount = __ulong($bytecount)
@_SYSCALL_MODIFY_LDT_ARGSTR
}
probe dw_syscall.modify_ldt.return = kernel.function("sys_modify_ldt").return ?
{
@_SYSCALL_MODIFY_LDT_NAME
@SYSC_RETVALSTR($return)
}
# nd_modify_ldt _____________________________________________________
probe nd_syscall.modify_ldt = nd1_syscall.modify_ldt!, nd2_syscall.modify_ldt!, tp_syscall.modify_ldt
{ }
probe nd1_syscall.modify_ldt = kprobe.function("sys_modify_ldt") ?
{
@_SYSCALL_MODIFY_LDT_NAME
asmlinkage()
@_SYSCALL_MODIFY_LDT_REGARGS
@_SYSCALL_MODIFY_LDT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.modify_ldt = kprobe.function(@arch_syscall_prefix "sys_modify_ldt") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_MODIFY_LDT_NAME
@_SYSCALL_MODIFY_LDT_REGARGS
@_SYSCALL_MODIFY_LDT_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.modify_ldt = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_modify_ldt"), @const("__NR_compat_modify_ldt"))
@_SYSCALL_MODIFY_LDT_NAME
@_SYSCALL_MODIFY_LDT_REGARGS
@_SYSCALL_MODIFY_LDT_ARGSTR
}
probe nd_syscall.modify_ldt.return = nd1_syscall.modify_ldt.return!, nd2_syscall.modify_ldt.return!, tp_syscall.modify_ldt.return
{ }
probe nd1_syscall.modify_ldt.return = kprobe.function("sys_modify_ldt").return ?
{
@_SYSCALL_MODIFY_LDT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.modify_ldt.return = kprobe.function(@arch_syscall_prefix "sys_modify_ldt").return ?
{
@_SYSCALL_MODIFY_LDT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.modify_ldt.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_modify_ldt"), @const("__NR_compat_modify_ldt"))
@_SYSCALL_MODIFY_LDT_NAME
@SYSC_RETVALSTR($ret)
}
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