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# truncate ___________________________________________________
#
# sys_truncate(const char __user * path, unsigned long length)
# sys_truncate64(const char __user * path, loff_t length)
# COMPAT_SYSCALL_DEFINE2(truncate, const char __user *, path,
# compat_off_t, length)
#
@define _SYSCALL_TRUNCATE_NAME
%(
name = "truncate"
%)
@define _SYSCALL_TRUNCATE_ARGSTR
%(
argstr = sprintf("%s, %d", path, length)
%)
@define _SYSCALL_GATE
%(
%( arch == "x86_64" || arch == "s390" %?
// On x86_64 and s390x RHL6 kernels, the 32-bit compat
// truncate syscall is hooked up directly to sys_truncate(),
// instead of going through compat_sys_truncate().
@__syscall_compat_gate(@const("__NR_truncate"),
@const("__NR_compat_truncate"))
%:
@__syscall_gate_compat_simple
%)
%)
probe syscall.truncate = dw_syscall.truncate !, nd_syscall.truncate ? {}
probe syscall.truncate.return = dw_syscall.truncate.return !,
nd_syscall.truncate.return ? {}
# dw_truncate _____________________________________________________
probe dw_syscall.truncate = __syscall.truncate ?, __syscall.truncate64 ?,
__syscall.compat_truncate ?
{
@_SYSCALL_TRUNCATE_NAME
path_uaddr = @__pointer($path)
path = user_string_quoted(path_uaddr)
@_SYSCALL_TRUNCATE_ARGSTR
}
probe __syscall.truncate = kernel.function("sys_truncate").call ?
{
@_SYSCALL_GATE
length = @__compat_long($length)
}
probe __syscall.truncate64 = kernel.function("sys_truncate64").call ?
{
length = $length
}
probe __syscall.compat_truncate = kernel.function("compat_sys_truncate").call ?
{
length = __int32($length)
}
probe dw_syscall.truncate.return = __syscall.truncate.return ?,
kernel.function("sys_truncate64").return ?,
kernel.function("compat_sys_truncate").return ?
{
@_SYSCALL_TRUNCATE_NAME
@SYSC_RETVALSTR($return)
}
probe __syscall.truncate.return = kernel.function("sys_truncate").return ?
{
@_SYSCALL_GATE
}
# nd_truncate _____________________________________________________
probe nd_syscall.truncate = nd1_syscall.truncate!, nd2_syscall.truncate!, tp_syscall.truncate
{ }
probe nd1_syscall.truncate = __nd1_syscall.truncate ?,
__nd1_syscall.truncate64 ?,
__nd1_syscall.compat_truncate ?
{
@_SYSCALL_TRUNCATE_NAME
asmlinkage()
path_uaddr = pointer_arg(1)
path = user_string_quoted(path_uaddr)
@_SYSCALL_TRUNCATE_ARGSTR
}
probe __nd1_syscall.truncate = kprobe.function("sys_truncate") ?
{
@_SYSCALL_GATE
asmlinkage()
length = long_arg(2)
}
probe __nd1_syscall.truncate64 = kprobe.function("sys_truncate64") ?
{
asmlinkage()
length = longlong_arg(2)
}
probe __nd1_syscall.compat_truncate = kprobe.function("compat_sys_truncate") ?
{
asmlinkage()
length = int_arg(2)
}
/* kernel 4.17+ */
probe nd2_syscall.truncate = __nd2_syscall.truncate ?,
__nd2_syscall.compat_truncate ?
{
@_SYSCALL_TRUNCATE_NAME
@_SYSCALL_TRUNCATE_ARGSTR
}
probe __nd2_syscall.truncate = kprobe.function(@arch_syscall_prefix "sys_truncate") ?
{
__set_syscall_pt_regs(pointer_arg(1))
path_uaddr = pointer_arg(1)
path = user_string_quoted(path_uaddr)
path_unquoted = user_string_nofault(pointer_arg(1))
length = long_arg(2)
},
{
%( @_IS_SREG_KERNEL %?
if (@probewrite(path_uaddr))
set_pointer_arg(1, path_uaddr)
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
if (@probewrite(length))
set_long_arg(2, length)
%)
}
probe __nd2_syscall.compat_truncate = kprobe.function(@arch_syscall_prefix "compat_sys_truncate") ?
{
__set_syscall_pt_regs(pointer_arg(1))
path_uaddr = pointer_arg(1)
path = user_string_quoted(path_uaddr)
path_unquoted = user_string_nofault(pointer_arg(1))
length = int_arg(2)
},
{
%( @_IS_SREG_KERNEL %?
if (@probewrite(path_uaddr))
set_pointer_arg(1, path_uaddr)
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
if (@probewrite(length))
set_int_arg(2, length)
%)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.truncate = __tp_syscall.truncate ?,
__tp_syscall.truncate64 ?,
__tp_syscall.compat_truncate ?
{
@_SYSCALL_TRUNCATE_NAME
@_SYSCALL_TRUNCATE_ARGSTR
}
probe __tp_syscall.truncate = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_gate(@const("__NR_truncate"))
path_uaddr = pointer_arg(1)
path = user_string_quoted(path_uaddr)
path_unquoted = user_string_nofault(pointer_arg(1))
length = long_arg(2)
},
{
%( @_IS_SREG_KERNEL %?
if (@probewrite(path_uaddr))
set_pointer_arg(1, path_uaddr)
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
if (@probewrite(length))
set_long_arg(2, length)
%)
}
probe __tp_syscall.truncate64 = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_gate(@const("__NR_truncate64"))
path_uaddr = pointer_arg(1)
path = user_string_quoted(path_uaddr)
path_unquoted = user_string_nofault(pointer_arg(1))
length = longlong_arg(2)
},
{
%( @_IS_SREG_KERNEL %?
if (@probewrite(path_uaddr))
set_pointer_arg(1, path_uaddr)
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
if (@probewrite(length))
set_longlong_arg(2, length)
%)
}
probe __tp_syscall.compat_truncate = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__compat_syscall_gate(@const("__NR_compat_truncate"))
path_uaddr = pointer_arg(1)
path = user_string_quoted(path_uaddr)
path_unquoted = user_string_nofault(pointer_arg(1))
length = int_arg(2)
},
{
%( @_IS_SREG_KERNEL %?
if (@probewrite(path_uaddr))
set_pointer_arg(1, path_uaddr)
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
if (@probewrite(length))
set_int_arg(2, length)
%)
}
probe nd_syscall.truncate.return = nd1_syscall.truncate.return!, nd2_syscall.truncate.return!, tp_syscall.truncate.return
{ }
probe nd1_syscall.truncate.return = __nd1_syscall.truncate.return ?,
kprobe.function("sys_truncate64").return ?,
kprobe.function("compat_sys_truncate").return ?
{
@_SYSCALL_TRUNCATE_NAME
@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.truncate.return = kprobe.function("sys_truncate").return ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.truncate.return =
kprobe.function(@arch_syscall_prefix "sys_truncate").return ?,
kprobe.function(@arch_syscall_prefix "compat_sys_truncate").return ?
{
@_SYSCALL_TRUNCATE_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.truncate.return = __tp_syscall.truncate.return,
__tp_syscall.truncate64.return
{
__set_syscall_pt_regs($regs)
@_SYSCALL_TRUNCATE_NAME
@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.truncate.return = kernel.trace("sys_exit")
{
@__syscall_compat_gate(@const("__NR_truncate"), @const("__NR_compat_truncate"))
}
probe __tp_syscall.truncate64.return = kernel.trace("sys_exit")
{
@__syscall_gate(@const("__NR_truncate64"))
}