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# openat _______________________________________________________
# long sys_openat(int dfd, const char __user *filename, int flags, int mode)
# long compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
#
@define _SYSCALL_OPENAT_NAME
%(
name = "openat"
%)
@define _SYSCALL_OPENAT_ARGSTR
%(
if (flags & @const("O_CREAT"))
argstr = sprintf("%s, %s, %s, %#o", dfd_str, filename, flags_str, mode)
else
argstr = sprintf("%s, %s, %s", dfd_str, filename, flags_str)
%)
@define _SYSCALL_OPENAT_REGARGS
%(
dfd = int_arg(1)
dfd_str = _dfd_str(dfd)
filename = user_string_quoted(pointer_arg(2))
flags = int_arg(3)
flags_str = _sys_open_flag_str(flags)
mode = uint_arg(4)
%)
probe syscall.openat = dw_syscall.openat !, nd_syscall.openat ? {}
probe syscall.openat.return = dw_syscall.openat.return !,
nd_syscall.openat.return ? {}
# dw_openat _____________________________________________________
probe dw_syscall.openat = kernel.function("compat_sys_openat").call ?,
kernel.function("sys_openat").call ?
{
@_SYSCALL_OPENAT_NAME
dfd = __int32($dfd)
dfd_str = _dfd_str(__int32($dfd))
filename = user_string_quoted(@__pointer($filename))
flags = $flags
flags_str = _sys_open_flag_str(flags)
mode = __uint32($mode)
@_SYSCALL_OPENAT_ARGSTR
}
probe dw_syscall.openat.return = kernel.function("compat_sys_openat").return ?,
kernel.function("sys_openat").return ?
{
@_SYSCALL_OPENAT_NAME
@SYSC_RETVALSTR($return)
}
# nd_openat _____________________________________________________
probe nd_syscall.openat = nd1_syscall.openat!, nd2_syscall.openat!, tp_syscall.openat
{ }
probe nd1_syscall.openat = kprobe.function("compat_sys_openat") ?,
kprobe.function("sys_openat") ?
{
@_SYSCALL_OPENAT_NAME
asmlinkage()
@_SYSCALL_OPENAT_REGARGS
@_SYSCALL_OPENAT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.openat = kprobe.function(@arch_syscall_prefix "compat_sys_openat") ?,
kprobe.function(@arch_syscall_prefix "sys_openat") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_OPENAT_NAME
@_SYSCALL_OPENAT_REGARGS
@_SYSCALL_OPENAT_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.openat = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_openat"), @const("__NR_compat_openat"))
@_SYSCALL_OPENAT_NAME
@_SYSCALL_OPENAT_REGARGS
@_SYSCALL_OPENAT_ARGSTR
}
probe nd_syscall.openat.return = nd1_syscall.openat.return!, nd2_syscall.openat.return!, tp_syscall.openat.return
{ }
probe nd1_syscall.openat.return = kprobe.function("compat_sys_openat").return ?,
kprobe.function("sys_openat").return ?
{
@_SYSCALL_OPENAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.openat.return = kprobe.function(@arch_syscall_prefix "compat_sys_openat").return ?,
kprobe.function(@arch_syscall_prefix "sys_openat").return ?
{
@_SYSCALL_OPENAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.openat.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_openat"), @const("__NR_compat_openat"))
@_SYSCALL_OPENAT_NAME
@SYSC_RETVALSTR($ret)
}
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