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# unlink _____________________________________________________
# long sys_unlink(const char __user * pathname)
#
@define _SYSCALL_UNLINK_NAME
%(
name = "unlink"
%)
@define _SYSCALL_UNLINK_ARGSTR
%(
argstr = pathname
%)
@define _SYSCALL_UNLINK_REGARGS
%(
pathname_uaddr = pointer_arg(1)
pathname = user_string_quoted(pathname_uaddr)
%)
probe syscall.unlink = dw_syscall.unlink !, nd_syscall.unlink ? {}
probe syscall.unlink.return = dw_syscall.unlink.return !,
nd_syscall.unlink.return ? {}
# dw_unlink _____________________________________________________
probe dw_syscall.unlink = kernel.function("sys_unlink").call
{
@_SYSCALL_UNLINK_NAME
pathname_uaddr = $pathname
pathname = user_string_quoted($pathname)
@_SYSCALL_UNLINK_ARGSTR
}
probe dw_syscall.unlink.return = kernel.function("sys_unlink").return
{
@_SYSCALL_UNLINK_NAME
@SYSC_RETVALSTR($return)
}
# nd_unlink _____________________________________________________
probe nd_syscall.unlink = nd1_syscall.unlink!, nd2_syscall.unlink!, tp_syscall.unlink
{ }
probe nd1_syscall.unlink = kprobe.function("sys_unlink") ?
{
@_SYSCALL_UNLINK_NAME
asmlinkage()
@_SYSCALL_UNLINK_REGARGS
@_SYSCALL_UNLINK_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.unlink = kprobe.function(@arch_syscall_prefix "sys_unlink") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_UNLINK_NAME
@_SYSCALL_UNLINK_REGARGS
@_SYSCALL_UNLINK_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.unlink = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_unlink"), @const("__NR_compat_unlink"))
@_SYSCALL_UNLINK_NAME
@_SYSCALL_UNLINK_REGARGS
@_SYSCALL_UNLINK_ARGSTR
}
probe nd_syscall.unlink.return = nd1_syscall.unlink.return!, nd2_syscall.unlink.return!, tp_syscall.unlink.return
{ }
probe nd1_syscall.unlink.return = kprobe.function("sys_unlink").return ?
{
@_SYSCALL_UNLINK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.unlink.return = kprobe.function(@arch_syscall_prefix "sys_unlink").return ?
{
@_SYSCALL_UNLINK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.unlink.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_unlink"), @const("__NR_compat_unlink"))
@_SYSCALL_UNLINK_NAME
@SYSC_RETVALSTR($ret)
}
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