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# chdir ______________________________________________________
# long sys_chdir(const char __user * filename)
@define _SYSCALL_CHDIR_NAME
%(
name = "chdir"
%)
@define _SYSCALL_CHDIR_ARGSTR
%(
argstr = path
%)
@define _SYSCALL_CHDIR_REGARGS
%(
path = user_string_quoted(pointer_arg(1))
path_unquoted = user_string_nofault(pointer_arg(1))
%)
@define _SYSCALL_CHDIR_REGARGS_STORE
%(
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
%)
probe syscall.chdir = dw_syscall.chdir !, nd_syscall.chdir ? {}
probe syscall.chdir.return = dw_syscall.chdir.return !, nd_syscall.chdir.return ? {}
# dw_chdir _____________________________________________________
probe dw_syscall.chdir = kernel.function("sys_chdir").call
{
@_SYSCALL_CHDIR_NAME
path = user_string_quoted($filename)
@_SYSCALL_CHDIR_ARGSTR
}
probe dw_syscall.chdir.return = kernel.function("sys_chdir").return
{
@_SYSCALL_CHDIR_NAME
@SYSC_RETVALSTR($return)
}
# nd_chdir _____________________________________________________
probe nd_syscall.chdir = nd1_syscall.chdir!, nd2_syscall.chdir!, tp_syscall.chdir
{ }
probe nd1_syscall.chdir = kprobe.function("sys_chdir") ?
{
@_SYSCALL_CHDIR_NAME
asmlinkage()
@_SYSCALL_CHDIR_REGARGS
@_SYSCALL_CHDIR_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.chdir = kprobe.function(@arch_syscall_prefix "sys_chdir")
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_CHDIR_NAME
@_SYSCALL_CHDIR_REGARGS
@_SYSCALL_CHDIR_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_CHDIR_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.chdir = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_chdir"), @const("__NR_compat_chdir"))
@_SYSCALL_CHDIR_NAME
@_SYSCALL_CHDIR_REGARGS
@_SYSCALL_CHDIR_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_CHDIR_REGARGS_STORE %)
}
probe nd_syscall.chdir.return = nd1_syscall.chdir.return!, nd2_syscall.chdir.return!, tp_syscall.chdir.return
{ }
probe nd1_syscall.chdir.return = kprobe.function("sys_chdir").return ?
{
@_SYSCALL_CHDIR_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.chdir.return = kprobe.function(@arch_syscall_prefix "sys_chdir").return
{
@_SYSCALL_CHDIR_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.chdir.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_chdir"), @const("__NR_compat_chdir"))
@_SYSCALL_CHDIR_NAME
@SYSC_RETVALSTR($ret)
}
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