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# get_thread_area ____________________________________________
/*
* asmlinkage int
* sys_get_thread_area(struct user_desc __user *u_info)
* asmlinkage long sys32_get_thread_area(struct user_desc __user *u_info)
*/
@define _SYSCALL_GET_THREAD_AREA_NAME
%(
name = "get_thread_area"
%)
@define _SYSCALL_GET_THREAD_AREA_ARGSTR
%(
argstr = u_info_str
%)
@define _SYSCALL_GET_THREAD_AREA_REGARGS
%(
u_info_uaddr = pointer_arg(1)
u_info_str = _struct_user_desc_u(u_info_uaddr)
%)
@define _SYSCALL_GET_THREAD_AREA_REGARGS_STORE
%(
if (@probewrite(u_info_uaddr))
set_pointer_arg(1, u_info_uaddr)
%)
probe syscall.get_thread_area = dw_syscall.get_thread_area !,
nd_syscall.get_thread_area ? {}
probe syscall.get_thread_area.return = dw_syscall.get_thread_area.return !,
nd_syscall.get_thread_area.return ? {}
# dw_get_thread_area _____________________________________________________
probe dw_syscall.get_thread_area = kernel.function("sys_get_thread_area") ?,
kernel.function("sys32_get_thread_area") ?
{
@_SYSCALL_GET_THREAD_AREA_NAME
u_info_uaddr = $u_info
u_info_str = _struct_user_desc_u(u_info_uaddr)
@_SYSCALL_GET_THREAD_AREA_ARGSTR
}
probe dw_syscall.get_thread_area.return =
kernel.function("sys_get_thread_area").return ?,
kernel.function("sys32_get_thread_area").return ?
{
@_SYSCALL_GET_THREAD_AREA_NAME
@SYSC_RETVALSTR($return)
}
# nd_get_thread_area _____________________________________________________
probe nd_syscall.get_thread_area = nd1_syscall.get_thread_area!, nd2_syscall.get_thread_area!, tp_syscall.get_thread_area
{ }
probe nd1_syscall.get_thread_area = kprobe.function("sys_get_thread_area") ?,
kprobe.function("sys32_get_thread_area") ?
{
@_SYSCALL_GET_THREAD_AREA_NAME
asmlinkage()
@_SYSCALL_GET_THREAD_AREA_REGARGS
@_SYSCALL_GET_THREAD_AREA_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.get_thread_area =
kprobe.function(@arch_syscall_prefix "sys_get_thread_area") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_GET_THREAD_AREA_NAME
@_SYSCALL_GET_THREAD_AREA_REGARGS
@_SYSCALL_GET_THREAD_AREA_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_GET_THREAD_AREA_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.get_thread_area = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_get_thread_area"), @const("__NR_ia32_get_thread_area"))
@_SYSCALL_GET_THREAD_AREA_NAME
@_SYSCALL_GET_THREAD_AREA_REGARGS
@_SYSCALL_GET_THREAD_AREA_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_GET_THREAD_AREA_REGARGS_STORE %)
}
probe nd_syscall.get_thread_area.return = nd1_syscall.get_thread_area.return!, nd2_syscall.get_thread_area.return!, tp_syscall.get_thread_area.return
{ }
probe nd1_syscall.get_thread_area.return =
kprobe.function("sys_get_thread_area").return ?,
kprobe.function("sys32_get_thread_area").return ?
{
@_SYSCALL_GET_THREAD_AREA_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.get_thread_area.return =
kprobe.function(@arch_syscall_prefix "sys_get_thread_area").return ?
{
@_SYSCALL_GET_THREAD_AREA_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.get_thread_area.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_get_thread_area"), @const("__NR_ia32_get_thread_area"))
@_SYSCALL_GET_THREAD_AREA_NAME
@SYSC_RETVALSTR($ret)
}
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