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# readlinkat ___________________________________________________
#
# long sys_readlinkat(int dfd, const char __user * path,
# char __user * buf,
# int bufsiz)
#
@define _SYSCALL_READLINKAT_NAME
%(
name = "readlinkat"
%)
@define _SYSCALL_READLINKAT_ARGSTR
%(
argstr = sprintf("%s, %s, %p, %d", dfd_str, path, buf_uaddr, bufsiz)
%)
@define _SYSCALL_READLINKAT_REGARGS
%(
dfd = int_arg(1)
dfd_str = _dfd_str(dfd)
path = user_string_quoted(pointer_arg(2))
path_unquoted = user_string_nofault(pointer_arg(2))
buf_uaddr = pointer_arg(3)
bufsiz = int_arg(4)
%)
@define _SYSCALL_READLINKAT_REGARGS_STORE
%(
if (@probewrite(dfd))
set_int_arg(1, dfd)
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(2), path_unquoted)
if (@probewrite(buf_uaddr))
set_pointer_arg(3, buf_uaddr)
if (@probewrite(bufsiz))
set_int_arg(4, bufsiz)
%)
probe syscall.readlinkat = dw_syscall.readlinkat !, nd_syscall.readlinkat ? {}
probe syscall.readlinkat.return = dw_syscall.readlinkat.return !,
nd_syscall.readlinkat.return ? {}
# dw_readlinkat _____________________________________________________
probe dw_syscall.readlinkat = kernel.function("sys_readlinkat").call ?
{
@__syscall_compat_gate(@const("__NR_readlinkat"),
@const("__NR_compat_readlinkat"))
@_SYSCALL_READLINKAT_NAME
dfd = __int32($dfd)
dfd_str = _dfd_str(__int32($dfd))
buf_uaddr = $buf
bufsiz = __int32($bufsiz)
path = user_string_quoted(@choose_defined($pathname, $path))
@_SYSCALL_READLINKAT_ARGSTR
}
probe dw_syscall.readlinkat.return = kernel.function("sys_readlinkat").return ?
{
@__syscall_compat_gate(@const("__NR_readlinkat"),
@const("__NR_compat_readlinkat"))
@_SYSCALL_READLINKAT_NAME
@SYSC_RETVALSTR($return)
}
# nd_readlinkat _____________________________________________________
probe nd_syscall.readlinkat = nd1_syscall.readlinkat!, nd2_syscall.readlinkat!, tp_syscall.readlinkat
{ }
probe nd1_syscall.readlinkat = kprobe.function("sys_readlinkat") ?
{
@__syscall_compat_gate(@const("__NR_readlinkat"),
@const("__NR_compat_readlinkat"))
@_SYSCALL_READLINKAT_NAME
asmlinkage()
@_SYSCALL_READLINKAT_REGARGS
@_SYSCALL_READLINKAT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.readlinkat = kprobe.function(@arch_syscall_prefix "sys_readlinkat") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_READLINKAT_NAME
@_SYSCALL_READLINKAT_REGARGS
@_SYSCALL_READLINKAT_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_READLINKAT_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.readlinkat = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_readlinkat"),
@const("__NR_compat_readlinkat"))
@_SYSCALL_READLINKAT_NAME
@_SYSCALL_READLINKAT_REGARGS
@_SYSCALL_READLINKAT_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_READLINKAT_REGARGS_STORE %)
}
probe nd_syscall.readlinkat.return = nd1_syscall.readlinkat.return!, nd2_syscall.readlinkat.return!, tp_syscall.readlinkat.return
{ }
probe nd1_syscall.readlinkat.return = kprobe.function("sys_readlinkat").return ?
{
@__syscall_compat_gate(@const("__NR_readlinkat"),
@const("__NR_compat_readlinkat"))
@_SYSCALL_READLINKAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.readlinkat.return = kprobe.function(@arch_syscall_prefix "sys_readlinkat").return ?
{
@_SYSCALL_READLINKAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.readlinkat.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_readlinkat"),
@const("__NR_compat_readlinkat"))
@_SYSCALL_READLINKAT_NAME
@SYSC_RETVALSTR($ret)
}
|
