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# unlinkat ___________________________________________________
# new function with 2.6.16
# long sys_unlinkat(int dfd, const char __user *pathname,
# int flag)
@define _SYSCALL_UNLINKAT_NAME
%(
name = "unlinkat"
%)
@define _SYSCALL_UNLINKAT_ARGSTR
%(
argstr = sprintf("%s, %s, %s", dfd_str, pathname_str, flag_str)
%)
@define _SYSCALL_UNLINKAT_REGARGS
%(
dfd = int_arg(1)
dfd_str = _dfd_str(dfd)
pathname = pointer_arg(2)
pathname_str = user_string_quoted(pathname)
flag = uint_arg(3)
flag_str = _at_flag_str(flag)
%)
probe syscall.unlinkat = dw_syscall.unlinkat !, nd_syscall.unlinkat ? {}
probe syscall.unlinkat.return = dw_syscall.unlinkat.return !,
nd_syscall.unlinkat.return ? {}
# dw_unlinkat _____________________________________________________
probe dw_syscall.unlinkat = kernel.function("sys_unlinkat").call ?
{
@_SYSCALL_UNLINKAT_NAME
dfd = __int32($dfd)
dfd_str = _dfd_str(__int32($dfd))
pathname = $pathname
pathname_str = user_string_quoted($pathname)
flag = __uint32($flag)
flag_str = _at_flag_str(__uint32($flag))
@_SYSCALL_UNLINKAT_ARGSTR
}
probe dw_syscall.unlinkat.return = kernel.function("sys_unlinkat").return ?
{
@_SYSCALL_UNLINKAT_NAME
@SYSC_RETVALSTR($return)
}
# nd_unlinkat _____________________________________________________
probe nd_syscall.unlinkat = nd1_syscall.unlinkat!, nd2_syscall.unlinkat!, tp_syscall.unlinkat
{ }
probe nd1_syscall.unlinkat = kprobe.function("sys_unlinkat") ?
{
@_SYSCALL_UNLINKAT_NAME
asmlinkage()
@_SYSCALL_UNLINKAT_REGARGS
@_SYSCALL_UNLINKAT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.unlinkat = kprobe.function(@arch_syscall_prefix "sys_unlinkat") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_UNLINKAT_NAME
@_SYSCALL_UNLINKAT_REGARGS
@_SYSCALL_UNLINKAT_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.unlinkat = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_unlinkat"), @const("__NR_compat_unlinkat"))
@_SYSCALL_UNLINKAT_NAME
@_SYSCALL_UNLINKAT_REGARGS
@_SYSCALL_UNLINKAT_ARGSTR
}
probe nd_syscall.unlinkat.return = nd1_syscall.unlinkat.return!, nd2_syscall.unlinkat.return!, tp_syscall.unlinkat.return
{ }
probe nd1_syscall.unlinkat.return = kprobe.function("sys_unlinkat").return ?
{
@_SYSCALL_UNLINKAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.unlinkat.return = kprobe.function(@arch_syscall_prefix "sys_unlinkat").return ?
{
@_SYSCALL_UNLINKAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.unlinkat.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_unlinkat"), @const("__NR_compat_unlinkat"))
@_SYSCALL_UNLINKAT_NAME
@SYSC_RETVALSTR($ret)
}
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