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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))
path_unquoted = user_string_nofault(pointer_arg(1))
buf_uaddr = pointer_arg(2)
%)
@define _SYSCALL_LSTAT_REGARGS_STORE
%(
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
if (@probewrite(buf_uaddr))
set_pointer_arg(2, buf_uaddr)
%)
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($return)
}
# nd_lstat _____________________________________________________
probe nd_syscall.lstat = nd1_syscall.lstat!, nd2_syscall.lstat!, tp_syscall.lstat
{ }
probe nd1_syscall.lstat = kprobe.function("sys_lstat") ?,
kprobe.function("sys_newlstat") ?,
kprobe.function("compat_sys_newlstat") ?,
kprobe.function("sys32_lstat64") ?,
kprobe.function("sys_lstat64") ?,
%( arch == "s390" %?
kprobe.function("compat_sys_s390_lstat64") ?,
%)
%( arch == "x86_64" %?
kprobe.function("compat_sys_x86_lstat64") ?,
%)
kprobe.function("sys_oabi_lstat64") ?
{
@_SYSCALL_LSTAT_NAME
asmlinkage()
@_SYSCALL_LSTAT_REGARGS
@_SYSCALL_LSTAT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.lstat =
kprobe.function(@arch_syscall_prefix "sys_lstat") ?,
kprobe.function(@arch_syscall_prefix "sys_newlstat") ?,
kprobe.function(@arch_syscall_prefix "compat_sys_newlstat") ?,
kprobe.function(@arch_syscall_prefix "compat_sys_x86_lstat64") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_LSTAT_NAME
@_SYSCALL_LSTAT_REGARGS
@_SYSCALL_LSTAT_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_LSTAT_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.lstat = __tp_syscall.lstat,
__tp_syscall.lstat64,
__tp_syscall.newlstat
{
__set_syscall_pt_regs($regs)
@_SYSCALL_LSTAT_NAME
@_SYSCALL_LSTAT_REGARGS
@_SYSCALL_LSTAT_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_LSTAT_REGARGS_STORE %)
}
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"))
}