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# fchownat ___________________________________________________
# new function with 2.6.16
# long sys_fchownat(int dfd, const char __user *filename,
# uid_t user, gid_t group, int flag)
@define _SYSCALL_FCHOWNAT_NAME
%(
name = "fchownat"
%)
@define _SYSCALL_FCHOWNAT_ARGSTR
%(
argstr = sprintf("%s, %s, %d, %d, %s", dirfd_str, pathname, owner,
group, flags_str)
%)
@define _SYSCALL_FCHOWNAT_REGARGS
%(
dirfd = int_arg(1)
dirfd_str = _dfd_str(dirfd)
pathname = user_string_quoted(pointer_arg(2))
owner = __int32(uint_arg(3))
group = __int32(uint_arg(4))
flags = int_arg(5)
flags_str = _at_flag_str(flags)
%)
probe syscall.fchownat = dw_syscall.fchownat !, nd_syscall.fchownat ? {}
probe syscall.fchownat.return = dw_syscall.fchownat.return !, nd_syscall.fchownat.return ? {}
# dw_fchownat _____________________________________________________
probe dw_syscall.fchownat = kernel.function("sys_fchownat").call ?
{
@__syscall_compat_gate(@const("__NR_fchownat"),
@const("__NR_compat_fchownat"))
@_SYSCALL_FCHOWNAT_NAME
dirfd = __int32($dfd)
dirfd_str = _dfd_str(__int32($dfd))
pathname = user_string_quoted($filename)
owner = __int32($user)
group = __int32($group)
flags = __int32($flag)
flags_str = _at_flag_str(__int32($flag))
@_SYSCALL_FCHOWNAT_ARGSTR
}
probe dw_syscall.fchownat.return = kernel.function("sys_fchownat").return ?
{
@__syscall_compat_gate(@const("__NR_fchownat"),
@const("__NR_compat_fchownat"))
@_SYSCALL_FCHOWNAT_NAME
@SYSC_RETVALSTR($return)
}
# nd_fchownat _____________________________________________________
probe nd_syscall.fchownat = nd1_syscall.fchownat!, nd2_syscall.fchownat!, tp_syscall.fchownat
{ }
probe nd1_syscall.fchownat = kprobe.function("sys_fchownat") ?
{
@__syscall_compat_gate(@const("__NR_fchownat"),
@const("__NR_compat_fchownat"))
@_SYSCALL_FCHOWNAT_NAME
asmlinkage()
@_SYSCALL_FCHOWNAT_REGARGS
@_SYSCALL_FCHOWNAT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.fchownat = kprobe.function(@arch_syscall_prefix "sys_fchownat") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_FCHOWNAT_NAME
@_SYSCALL_FCHOWNAT_REGARGS
@_SYSCALL_FCHOWNAT_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fchownat = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_fchownat"), @const("__NR_compat_fchownat"))
@_SYSCALL_FCHOWNAT_NAME
@_SYSCALL_FCHOWNAT_REGARGS
@_SYSCALL_FCHOWNAT_ARGSTR
}
probe nd_syscall.fchownat.return = nd1_syscall.fchownat.return!, nd2_syscall.fchownat.return!, tp_syscall.fchownat.return
{ }
probe nd1_syscall.fchownat.return = kprobe.function("sys_fchownat").return ?
{
@__syscall_compat_gate(@const("__NR_fchownat"),
@const("__NR_compat_fchownat"))
@_SYSCALL_FCHOWNAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.fchownat.return = kprobe.function(@arch_syscall_prefix "sys_fchownat").return ?
{
@_SYSCALL_FCHOWNAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fchownat.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_fchownat"), @const("__NR_compat_fchownat"))
@_SYSCALL_FCHOWNAT_NAME
@SYSC_RETVALSTR($ret)
}
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