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Filename : sysc_lstat.stp
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# lstat ______________________________________________________
# long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
# long sys_newlstat(char __user * filename, struct stat __user * statbuf)
# long compat_sys_newlstat(char __user * filename, struct compat_stat __user *statbuf)
# long sys32_lstat64(char * filename, struct stat64 __user *statbuf)
# long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
# long sys_oabi_lstat64(char __user * filename,
#			struct oldabi_stat64 __user * statbuf)
# COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
#

@define _SYSCALL_LSTAT_NAME
%(
	name = "lstat"
%)

@define _SYSCALL_LSTAT_ARGSTR
%(
	argstr = sprintf("%s, %p", path, buf_uaddr)
%)

@define _SYSCALL_LSTAT_REGARGS
%(
	path = user_string_quoted(pointer_arg(1))
	buf_uaddr = pointer_arg(2)
%)

probe syscall.lstat = dw_syscall.lstat !, nd_syscall.lstat ? {}
probe syscall.lstat.return = dw_syscall.lstat.return !,
                             nd_syscall.lstat.return ? {}

# dw_lstat _____________________________________________________

probe dw_syscall.lstat = kernel.function("sys_lstat").call ?,
                      kernel.function("sys_newlstat").call ?,
                      kernel.function("compat_sys_newlstat").call ?,
                      kernel.function("sys32_lstat64").call ?,
                      kernel.function("sys_lstat64").call ?,
%( arch == "s390" %?
                      kernel.function("compat_sys_s390_lstat64").call ?,
%)
%( arch == "x86_64" %?
                      kernel.function("compat_sys_x86_lstat64").call ?,
%)
                      kernel.function("sys_oabi_lstat64").call ?
{
	@_SYSCALL_LSTAT_NAME
	path = user_string_quoted(@__pointer($filename))
	buf_uaddr = @__pointer($statbuf)
	@_SYSCALL_LSTAT_ARGSTR
}
probe dw_syscall.lstat.return = kernel.function("sys_lstat").return ?,
	kernel.function("sys_newlstat").return ?,
	kernel.function("compat_sys_newlstat").return ?,
	kernel.function("sys32_lstat64").return ?,
	kernel.function("sys_lstat64").return ?,
%( arch == "s390" %?
	kernel.function("compat_sys_s390_lstat64").return ?,
%)
%( arch == "x86_64" %?
	kernel.function("compat_sys_x86_lstat64").return ?,
%)
	kernel.function("sys_oabi_lstat64").return ?
{
	@_SYSCALL_LSTAT_NAME
	@SYSC_RETVALSTR($return)
}

# nd_lstat _____________________________________________________

probe nd_syscall.lstat = nd1_syscall.lstat!, nd2_syscall.lstat!, tp_syscall.lstat
  { }

probe nd1_syscall.lstat = kprobe.function("sys_lstat") ?,
                          kprobe.function("sys_newlstat") ?,
                          kprobe.function("compat_sys_newlstat") ?,
                          kprobe.function("sys32_lstat64") ?,
                          kprobe.function("sys_lstat64") ?,
%( arch == "s390" %?
                          kprobe.function("compat_sys_s390_lstat64") ?,
%)
%( arch == "x86_64" %?
                          kprobe.function("compat_sys_x86_lstat64") ?,
%)
                          kprobe.function("sys_oabi_lstat64") ?
{
	@_SYSCALL_LSTAT_NAME
	asmlinkage()
	@_SYSCALL_LSTAT_REGARGS
	@_SYSCALL_LSTAT_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.lstat =
	kprobe.function(@arch_syscall_prefix "sys_lstat") ?,
	kprobe.function(@arch_syscall_prefix "sys_newlstat") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_newlstat") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_x86_lstat64") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_LSTAT_NAME
	@_SYSCALL_LSTAT_REGARGS
	@_SYSCALL_LSTAT_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.lstat = __tp_syscall.lstat,
                         __tp_syscall.lstat64,
                         __tp_syscall.newlstat
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_LSTAT_NAME
	@_SYSCALL_LSTAT_REGARGS
	@_SYSCALL_LSTAT_ARGSTR
}
probe __tp_syscall.lstat = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_oldlstat"), @const("__NR_compat_oldlstat"))
}
probe __tp_syscall.lstat64 = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_lstat64"), @const("__NR_compat_lstat64"))
}
probe __tp_syscall.newlstat = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_lstat"), @const("__NR_compat_lstat"))
}

probe nd_syscall.lstat.return = nd1_syscall.lstat.return!, nd2_syscall.lstat.return!, tp_syscall.lstat.return
  { }

probe nd1_syscall.lstat.return = kprobe.function("sys_lstat").return ?,
	kprobe.function("sys_newlstat").return ?,
	kprobe.function("compat_sys_newlstat").return ?,
	kprobe.function("sys32_lstat64").return ?,
	kprobe.function("sys_lstat64").return ?,
%( arch == "s390" %?
	kprobe.function("compat_sys_s390_lstat64").return ?,
%)
%( arch == "x86_64" %?
	kprobe.function("compat_sys_x86_lstat64").return ?,
%)
	kprobe.function("sys_oabi_lstat64").return ?
{
	@_SYSCALL_LSTAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.lstat.return =
	kprobe.function(@arch_syscall_prefix "sys_lstat").return ?,
	kprobe.function(@arch_syscall_prefix "sys_newlstat").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_newlstat").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_x86_lstat64").return ?
{
	@_SYSCALL_LSTAT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.lstat.return = __tp_syscall.lstat.return,
                                __tp_syscall.lstat64.return,
                                __tp_syscall.newlstat.return
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_LSTAT_NAME
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.lstat.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_oldlstat"), @const("__NR_compat_oldlstat"))
}
probe __tp_syscall.lstat64.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_lstat64"), @const("__NR_compat_lstat64"))
}
probe __tp_syscall.newlstat.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_lstat"), @const("__NR_compat_lstat"))
}