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# lseek ______________________________________________________
# off_t sys_lseek(unsigned int fd, off_t offset, unsigned int whence)
# COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset,
# unsigned int, whence)
# long sys32_lseek(unsigned int fd, int offset, unsigned int whence)
#
@define _SYSCALL_LSEEK_NAME
%(
name = "lseek"
%)
@define _SYSCALL_LSEEK_ARGSTR
%(
argstr = sprintf("%d, %d, %s", fildes, offset, whence_str)
%)
@define _SYSCALL_LSEEK_REGARGS
%(
fildes = int_arg(1)
offset = @__compat_task ? int_arg(2) : long_arg(2)
whence = uint_arg(3)
whence_str = _seek_whence_str(whence)
%)
@define _SYSCALL_LSEEK_REGARGS_STORE
%(
if (@probewrite(fildes))
set_int_arg(1, fildes)
if (@probewrite(offset)) {
if (@__compat_task)
set_int_arg(2, offset)
else
set_long_arg(2, offset)
}
if (@probewrite(whence))
set_uint_arg(3, whence)
%)
@define _SYSCALL_GATE
%(
%( arch == "s390" %?
// On s390x, older kernels used sys32_lseek_wrapper() as the
// lseek compat function. Since sys32_lseek_wrapper() was
// written in assembly language, we can't probe it. So, on
// those kernels, we'll probe sys_lseek().
%( kernel_v >= "3.10" %?
@__syscall_gate_compat_simple
%)
%:
@__syscall_gate_compat_simple
%)
%)
probe syscall.lseek = dw_syscall.lseek !, nd_syscall.lseek ? {}
probe syscall.lseek.return = dw_syscall.lseek.return !, nd_syscall.lseek.return ? {}
# dw_lseek _____________________________________________________
probe dw_syscall.lseek = __syscall.lseek ?,
%( arch == "powerpc" %?
kernel.function("ppc32_lseek").call ?,
%)
kernel.function("compat_sys_lseek").call ?,
kernel.function("sys32_lseek").call ?
{
@_SYSCALL_LSEEK_NAME
fildes = __int32($fd)
offset = @__compat_long($offset)
whence = @__compat_ulong(@choose_defined($whence, $origin))
whence_str = _seek_whence_str(whence)
@_SYSCALL_LSEEK_ARGSTR
}
probe __syscall.lseek = kernel.function("sys_lseek").call ?
{
@_SYSCALL_GATE
}
probe dw_syscall.lseek.return = __syscall.lseek.return ?,
%( arch == "powerpc" %?
kernel.function("ppc32_lseek").return ?,
%)
kernel.function("compat_sys_lseek").return ?,
kernel.function("sys32_lseek").return ?
{
@_SYSCALL_LSEEK_NAME
@SYSC_RETVALSTR($return)
}
probe __syscall.lseek.return = kernel.function("sys_lseek").return ?
{
@_SYSCALL_GATE
}
# nd_lseek _____________________________________________________
probe nd_syscall.lseek = nd1_syscall.lseek!, nd2_syscall.lseek!, tp_syscall.lseek
{ }
probe nd1_syscall.lseek = __nd1_syscall.lseek ?,
%( arch == "powerpc" %?
kprobe.function("ppc32_lseek") ?,
%)
kprobe.function("compat_sys_lseek") ?,
kprobe.function("sys32_lseek") ?
{
@_SYSCALL_LSEEK_NAME
asmlinkage()
@_SYSCALL_LSEEK_REGARGS
@_SYSCALL_LSEEK_ARGSTR
}
probe __nd1_syscall.lseek = kprobe.function("sys_lseek") ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.lseek = kprobe.function(@arch_syscall_prefix "sys_lseek") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_LSEEK_NAME
@_SYSCALL_LSEEK_REGARGS
@_SYSCALL_LSEEK_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_LSEEK_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.lseek = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_lseek"), @const("__NR_compat_lseek"))
@_SYSCALL_LSEEK_NAME
@_SYSCALL_LSEEK_REGARGS
@_SYSCALL_LSEEK_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_LSEEK_REGARGS_STORE %)
}
probe nd_syscall.lseek.return = nd1_syscall.lseek.return!, nd2_syscall.lseek.return!, tp_syscall.lseek.return
{ }
probe nd1_syscall.lseek.return = __nd1_syscall.lseek.return ?,
%( arch == "powerpc" %?
kprobe.function("ppc32_lseek").return ?,
%)
kprobe.function("compat_sys_lseek").return ?,
kprobe.function("sys32_lseek").return ?
{
@_SYSCALL_LSEEK_NAME
@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.lseek.return = kprobe.function("sys_lseek").return ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.lseek.return = kprobe.function(@arch_syscall_prefix "sys_lseek").return ?
{
@_SYSCALL_LSEEK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.lseek.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_lseek"), @const("__NR_compat_lseek"))
@_SYSCALL_LSEEK_NAME
@SYSC_RETVALSTR($ret)
}
|
