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# symlinkat __________________________________________________
# new function with 2.6.16
# long sys_symlinkat(const char __user *oldname, int newdfd,
# const char __user *newname)
@define _SYSCALL_SYMLINKAT_NAME
%(
name = "symlinkat"
%)
@define _SYSCALL_SYMLINKAT_ARGSTR
%(
argstr = sprintf("%s, %s, %s", oldname_str, newdfd_str, newname_str)
%)
@define _SYSCALL_SYMLINKAT_REGARGS
%(
oldname = pointer_arg(1)
oldname_str = user_string_quoted(oldname)
newdfd = int_arg(2)
newdfd_str = _dfd_str(newdfd)
newname = pointer_arg(3)
newname_str = user_string_quoted(newname)
%)
probe syscall.symlinkat = dw_syscall.symlinkat !, nd_syscall.symlinkat ? {}
probe syscall.symlinkat.return = dw_syscall.symlinkat.return !,
nd_syscall.symlinkat.return ? {}
# dw_symlinkat _____________________________________________________
probe dw_syscall.symlinkat = kernel.function("sys_symlinkat").call ?
{
@__syscall_compat_gate(@const("__NR_symlinkat"),
@const("__NR_compat_symlinkat"))
@_SYSCALL_SYMLINKAT_NAME
oldname = $oldname
oldname_str = user_string_quoted($oldname)
newdfd = __int32($newdfd)
newdfd_str = _dfd_str(__int32($newdfd))
newname = $newname
newname_str = user_string_quoted($newname)
@_SYSCALL_SYMLINKAT_ARGSTR
}
probe dw_syscall.symlinkat.return = kernel.function("sys_symlinkat").return ?
{
@__syscall_compat_gate(@const("__NR_symlinkat"),
@const("__NR_compat_symlinkat"))
@_SYSCALL_SYMLINKAT_NAME
@SYSC_RETVALSTR($return)
}
# nd_symlinkat _____________________________________________________
probe nd_syscall.symlinkat = nd1_syscall.symlinkat!, nd2_syscall.symlinkat!, tp_syscall.symlinkat
{ }
probe nd1_syscall.symlinkat = kprobe.function("sys_symlinkat") ?
{
@__syscall_compat_gate(@const("__NR_symlinkat"),
@const("__NR_compat_symlinkat"))
@_SYSCALL_SYMLINKAT_NAME
asmlinkage()
@_SYSCALL_SYMLINKAT_REGARGS
@_SYSCALL_SYMLINKAT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.symlinkat = kprobe.function(@arch_syscall_prefix "sys_symlinkat") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_SYMLINKAT_NAME
@_SYSCALL_SYMLINKAT_REGARGS
@_SYSCALL_SYMLINKAT_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.symlinkat = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_symlinkat"),
@const("__NR_compat_symlinkat"))
@_SYSCALL_SYMLINKAT_NAME
@_SYSCALL_SYMLINKAT_REGARGS
@_SYSCALL_SYMLINKAT_ARGSTR
}
probe nd_syscall.symlinkat.return = nd1_syscall.symlinkat.return!, nd2_syscall.symlinkat.return!, tp_syscall.symlinkat.return
{ }
probe nd1_syscall.symlinkat.return = kprobe.function("sys_symlinkat").return ?
{
@__syscall_compat_gate(@const("__NR_symlinkat"),
@const("__NR_compat_symlinkat"))
@_SYSCALL_SYMLINKAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.symlinkat.return = kprobe.function(@arch_syscall_prefix "sys_symlinkat").return ?
{
@_SYSCALL_SYMLINKAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.symlinkat.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_symlinkat"),
@const("__NR_compat_symlinkat"))
@_SYSCALL_SYMLINKAT_NAME
@SYSC_RETVALSTR($ret)
}
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