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# getcwd _____________________________________________________
# long sys_getcwd(char __user *buf, unsigned long size)
@define _SYSCALL_GETCWD_NAME
%(
name = "getcwd"
%)
@define _SYSCALL_GETCWD_ARGSTR
%(
argstr = sprintf("%p, %d", buf_uaddr, size)
%)
@define _SYSCALL_GETCWD_REGARGS
%(
buf_uaddr = pointer_arg(1)
size = ulong_arg(2)
%)
@define _SYSCALL_GETCWD_REGARGS_STORE
%(
if (@probewrite(buf_uaddr))
set_pointer_arg(1, buf_uaddr)
if (@probewrite(size))
set_ulong_arg(2, size)
%)
probe syscall.getcwd = dw_syscall.getcwd !, nd_syscall.getcwd ? {}
probe syscall.getcwd.return = dw_syscall.getcwd.return !, nd_syscall.getcwd.return ? {}
# dw_getcwd _____________________________________________________
# long sys_getcwd(char __user *buf, unsigned long size)
probe dw_syscall.getcwd = kernel.function("sys_getcwd").call
{
@_SYSCALL_GETCWD_NAME
buf_uaddr = $buf
size = $size
@_SYSCALL_GETCWD_ARGSTR
}
probe dw_syscall.getcwd.return = kernel.function("sys_getcwd").return
{
@_SYSCALL_GETCWD_NAME
@SYSC_RETVALSTR($return)
}
# nd_getcwd _____________________________________________________
# long sys_getcwd(char __user *buf, unsigned long size)
#
probe nd_syscall.getcwd = nd1_syscall.getcwd!, nd2_syscall.getcwd!, tp_syscall.getcwd
{ }
probe nd1_syscall.getcwd = kprobe.function("sys_getcwd") ?
{
@_SYSCALL_GETCWD_NAME
asmlinkage()
@_SYSCALL_GETCWD_REGARGS
@_SYSCALL_GETCWD_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.getcwd = kprobe.function(@arch_syscall_prefix "sys_getcwd") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_GETCWD_NAME
@_SYSCALL_GETCWD_REGARGS
@_SYSCALL_GETCWD_ARGSTR
},
{
@_SYSCALL_GETCWD_REGARGS_STORE
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getcwd = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_getcwd"), @const("__NR_compat_getcwd"))
@_SYSCALL_GETCWD_NAME
@_SYSCALL_GETCWD_REGARGS
@_SYSCALL_GETCWD_ARGSTR
},
{
@_SYSCALL_GETCWD_REGARGS_STORE
}
probe nd_syscall.getcwd.return = nd1_syscall.getcwd.return!, nd2_syscall.getcwd.return!, tp_syscall.getcwd.return
{ }
probe nd1_syscall.getcwd.return = kprobe.function("sys_getcwd").return ?
{
@_SYSCALL_GETCWD_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.getcwd.return = kprobe.function(@arch_syscall_prefix "sys_getcwd").return ?
{
@_SYSCALL_GETCWD_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getcwd.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_getcwd"), @const("__NR_compat_getcwd"))
@_SYSCALL_GETCWD_NAME
@SYSC_RETVALSTR($ret)
}
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