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# kexec_file_load ____________________________________________
# The kexec_file_load() system call first appeared in Linux 3.17
# SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
# unsigned long, cmdline_len, const char __user *, cmdline_ptr,
# unsigned long, flags)
@define _SYSCALL_KEXEC_FILE_LOAD_NAME
%(
name = "kexec_file_load"
%)
@define _SYSCALL_KEXEC_FILE_LOAD_ARGSTR
%(
argstr = sprintf("%d, %d, %u, %s, %s", kernel_fd, initrd_fd, cmdline_len,
cmdline, flags_str)
%)
@define _SYSCALL_KEXEC_FILE_LOAD_REGARGS
%(
kernel_fd = int_arg(1)
initrd_fd = int_arg(2)
cmdline_len = ulong_arg(3)
cmdline = user_string_quoted(pointer_arg(4))
cmdline_unquoted = user_string_nofault(pointer_arg(4))
flags = ulong_arg(5)
flags_str = _kexec_file_load_flags_str(flags)
%)
@define _SYSCALL_KEXEC_FILE_LOAD_REGARGS_STORE
%(
if (@probewrite(kernel_fd))
set_int_arg(1, kernel_fd)
if (@probewrite(initrd_fd))
set_int_arg(2, initrd_fd)
if (@probewrite(cmdline_len))
set_ulong_arg(3, cmdline_len)
if (@probewrite(cmdline_unquoted))
set_user_string_arg(pointer_arg(4), cmdline_unquoted)
if (@probewrite(flags))
set_ulong_arg(5, flags)
%)
probe syscall.kexec_file_load = dw_syscall.kexec_file_load !, nd_syscall.kexec_file_load ? {}
probe syscall.kexec_file_load.return = dw_syscall.kexec_file_load.return !, nd_syscall.kexec_file_load.return ? {}
# dw_kexec_file_load _____________________________________________________
probe dw_syscall.kexec_file_load = kernel.function("sys_kexec_file_load").call ?
{
@_SYSCALL_KEXEC_FILE_LOAD_NAME
kernel_fd = __int32($kernel_fd)
initrd_fd = __int32($initrd_fd)
cmdline_len = @__compat_ulong($cmdline_len)
cmdline = user_string_quoted($cmdline_ptr)
flags = @__compat_ulong($flags)
flags_str = _kexec_file_load_flags_str(flags)
@_SYSCALL_KEXEC_FILE_LOAD_ARGSTR
}
probe dw_syscall.kexec_file_load.return =
kernel.function("sys_kexec_file_load").return ?
{
@_SYSCALL_KEXEC_FILE_LOAD_NAME
@SYSC_RETVALSTR($return)
}
# nd_kexec_file_load _____________________________________________________
probe nd_syscall.kexec_file_load = nd1_syscall.kexec_file_load!, nd2_syscall.kexec_file_load!, tp_syscall.kexec_file_load
{ }
probe nd1_syscall.kexec_file_load = kprobe.function("sys_kexec_file_load") ?
{
@_SYSCALL_KEXEC_FILE_LOAD_NAME
@_SYSCALL_KEXEC_FILE_LOAD_REGARGS
@_SYSCALL_KEXEC_FILE_LOAD_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.kexec_file_load = kprobe.function(@arch_syscall_prefix "sys_kexec_file_load") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_KEXEC_FILE_LOAD_NAME
@_SYSCALL_KEXEC_FILE_LOAD_REGARGS
@_SYSCALL_KEXEC_FILE_LOAD_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_KEXEC_FILE_LOAD_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.kexec_file_load = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_kexec_file_load"), @const("__NR_compat_kexec_file_load"))
@_SYSCALL_KEXEC_FILE_LOAD_NAME
@_SYSCALL_KEXEC_FILE_LOAD_REGARGS
@_SYSCALL_KEXEC_FILE_LOAD_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_KEXEC_FILE_LOAD_REGARGS_STORE %)
}
probe nd_syscall.kexec_file_load.return = nd1_syscall.kexec_file_load.return!, nd2_syscall.kexec_file_load.return!, tp_syscall.kexec_file_load.return
{ }
probe nd1_syscall.kexec_file_load.return =
kprobe.function("sys_kexec_file_load").return ?
{
@_SYSCALL_KEXEC_FILE_LOAD_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.kexec_file_load.return = kprobe.function(@arch_syscall_prefix "sys_kexec_file_load").return ?
{
@_SYSCALL_KEXEC_FILE_LOAD_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.kexec_file_load.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_kexec_file_load"), @const("__NR_compat_kexec_file_load"))
@_SYSCALL_KEXEC_FILE_LOAD_NAME
@SYSC_RETVALSTR($ret)
}
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