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HardenedBSD/lib/libsysdecode/errno.c

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Add handling for non-native error values to libsysdecode. Add two new functions, sysdecode_abi_to_freebsd_errno() and sysdecode_freebsd_to_abi_errno(), which convert errno values between the native FreeBSD ABI and other supported ABIs. Note that the mappings are not necessarily perfect meaning in some cases multiple errors in one ABI might map to a single error in another ABI. In that case, the reverse mapping will return one of the errors that maps, but which error is non-deterministic. Change truss to always report the raw error value to the user but use libsysdecode to map it to a native errno value that can be used with strerror() to generate a description. Previously truss reported the "converted" error value. Now the user will always see the exact error value that the application sees. Change kdump to report the truly raw error value to the user. Previously kdump would report the absolute value of the raw error value (so for Linux binaries it didn't output the FreeBSD error value, but the positive value of the Linux error). Now it reports the real (i.e. negative) error value for Linux binaries. Also, use libsysdecode to convert the native FreeBSD error reported in the ktrace record to the raw error used by the ABI. This means that the Linux ABI can now be handled directly in ktrsysret() and removes the need for linux_ktrsysret(). Reviewed by: bdrewery, kib Helpful notes: wblock (manpage) Differential Revision: https://reviews.freebsd.org/D5314
2016-02-23 21:00:55 +01:00
/*-
* Copyright (c) 2015 John H. Baldwin <jhb@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <sysdecode.h>
#if defined(__i386__) || defined(__amd64__)
/*
* Linux syscalls return negative errno's, we do positive and map them
* Reference:
* FreeBSD: src/sys/sys/errno.h
* Linux: linux-2.6.17.8/include/asm-generic/errno-base.h
* linux-2.6.17.8/include/asm-generic/errno.h
*/
static int bsd_to_linux_errno[ELAST + 1] = {
-0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
-10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
-20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
-30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
-90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
-100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
-110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
-116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
-6, -6, -43, -42, -75,-125, -84, -95, -16, -74,
-72, -67, -71
};
#endif
#if defined(__aarch64__) || defined(__amd64__)
#include <compat/cloudabi/cloudabi_syscalldefs.h>
static const int cloudabi_errno_table[] = {
[CLOUDABI_E2BIG] = E2BIG,
[CLOUDABI_EACCES] = EACCES,
[CLOUDABI_EADDRINUSE] = EADDRINUSE,
[CLOUDABI_EADDRNOTAVAIL] = EADDRNOTAVAIL,
[CLOUDABI_EAFNOSUPPORT] = EAFNOSUPPORT,
[CLOUDABI_EAGAIN] = EAGAIN,
[CLOUDABI_EALREADY] = EALREADY,
[CLOUDABI_EBADF] = EBADF,
[CLOUDABI_EBADMSG] = EBADMSG,
[CLOUDABI_EBUSY] = EBUSY,
[CLOUDABI_ECANCELED] = ECANCELED,
[CLOUDABI_ECHILD] = ECHILD,
[CLOUDABI_ECONNABORTED] = ECONNABORTED,
[CLOUDABI_ECONNREFUSED] = ECONNREFUSED,
[CLOUDABI_ECONNRESET] = ECONNRESET,
[CLOUDABI_EDEADLK] = EDEADLK,
[CLOUDABI_EDESTADDRREQ] = EDESTADDRREQ,
[CLOUDABI_EDOM] = EDOM,
[CLOUDABI_EDQUOT] = EDQUOT,
[CLOUDABI_EEXIST] = EEXIST,
[CLOUDABI_EFAULT] = EFAULT,
[CLOUDABI_EFBIG] = EFBIG,
[CLOUDABI_EHOSTUNREACH] = EHOSTUNREACH,
[CLOUDABI_EIDRM] = EIDRM,
[CLOUDABI_EILSEQ] = EILSEQ,
[CLOUDABI_EINPROGRESS] = EINPROGRESS,
[CLOUDABI_EINTR] = EINTR,
[CLOUDABI_EINVAL] = EINVAL,
[CLOUDABI_EIO] = EIO,
[CLOUDABI_EISCONN] = EISCONN,
[CLOUDABI_EISDIR] = EISDIR,
[CLOUDABI_ELOOP] = ELOOP,
[CLOUDABI_EMFILE] = EMFILE,
[CLOUDABI_EMLINK] = EMLINK,
[CLOUDABI_EMSGSIZE] = EMSGSIZE,
[CLOUDABI_EMULTIHOP] = EMULTIHOP,
[CLOUDABI_ENAMETOOLONG] = ENAMETOOLONG,
[CLOUDABI_ENETDOWN] = ENETDOWN,
[CLOUDABI_ENETRESET] = ENETRESET,
[CLOUDABI_ENETUNREACH] = ENETUNREACH,
[CLOUDABI_ENFILE] = ENFILE,
[CLOUDABI_ENOBUFS] = ENOBUFS,
[CLOUDABI_ENODEV] = ENODEV,
[CLOUDABI_ENOENT] = ENOENT,
[CLOUDABI_ENOEXEC] = ENOEXEC,
[CLOUDABI_ENOLCK] = ENOLCK,
[CLOUDABI_ENOLINK] = ENOLINK,
[CLOUDABI_ENOMEM] = ENOMEM,
[CLOUDABI_ENOMSG] = ENOMSG,
[CLOUDABI_ENOPROTOOPT] = ENOPROTOOPT,
[CLOUDABI_ENOSPC] = ENOSPC,
[CLOUDABI_ENOSYS] = ENOSYS,
[CLOUDABI_ENOTCONN] = ENOTCONN,
[CLOUDABI_ENOTDIR] = ENOTDIR,
[CLOUDABI_ENOTEMPTY] = ENOTEMPTY,
[CLOUDABI_ENOTRECOVERABLE] = ENOTRECOVERABLE,
[CLOUDABI_ENOTSOCK] = ENOTSOCK,
[CLOUDABI_ENOTSUP] = ENOTSUP,
[CLOUDABI_ENOTTY] = ENOTTY,
[CLOUDABI_ENXIO] = ENXIO,
[CLOUDABI_EOVERFLOW] = EOVERFLOW,
[CLOUDABI_EOWNERDEAD] = EOWNERDEAD,
[CLOUDABI_EPERM] = EPERM,
[CLOUDABI_EPIPE] = EPIPE,
[CLOUDABI_EPROTO] = EPROTO,
[CLOUDABI_EPROTONOSUPPORT] = EPROTONOSUPPORT,
[CLOUDABI_EPROTOTYPE] = EPROTOTYPE,
[CLOUDABI_ERANGE] = ERANGE,
[CLOUDABI_EROFS] = EROFS,
[CLOUDABI_ESPIPE] = ESPIPE,
[CLOUDABI_ESRCH] = ESRCH,
[CLOUDABI_ESTALE] = ESTALE,
[CLOUDABI_ETIMEDOUT] = ETIMEDOUT,
[CLOUDABI_ETXTBSY] = ETXTBSY,
[CLOUDABI_EXDEV] = EXDEV,
[CLOUDABI_ENOTCAPABLE] = ENOTCAPABLE,
};
#endif
int
sysdecode_abi_to_freebsd_errno(enum sysdecode_abi abi, int error)
{
switch (abi) {
case SYSDECODE_ABI_FREEBSD:
case SYSDECODE_ABI_FREEBSD32:
return (error);
#if defined(__i386__) || defined(__amd64__)
case SYSDECODE_ABI_LINUX:
case SYSDECODE_ABI_LINUX32: {
unsigned int i;
/*
* This is imprecise since it returns the first
* matching errno.
*/
for (i = 0; i < nitems(bsd_to_linux_errno); i++) {
if (error == bsd_to_linux_errno[i])
return (i);
}
break;
}
#endif
#if defined(__aarch64__) || defined(__amd64__)
case SYSDECODE_ABI_CLOUDABI64:
if (error >= 0 &&
(unsigned int)error < nitems(cloudabi_errno_table))
return (cloudabi_errno_table[error]);
break;
#endif
default:
break;
}
return (INT_MAX);
}
int
sysdecode_freebsd_to_abi_errno(enum sysdecode_abi abi, int error)
{
switch (abi) {
case SYSDECODE_ABI_FREEBSD:
case SYSDECODE_ABI_FREEBSD32:
return (error);
#if defined(__i386__) || defined(__amd64__)
case SYSDECODE_ABI_LINUX:
case SYSDECODE_ABI_LINUX32:
if (error >= 0 && error <= ELAST)
return (bsd_to_linux_errno[error]);
break;
#endif
#if defined(__aarch64__) || defined(__amd64__)
case SYSDECODE_ABI_CLOUDABI64: {
unsigned int i;
for (i = 0; i < nitems(cloudabi_errno_table); i++) {
if (error == cloudabi_errno_table[i])
return (i);
}
break;
}
#endif
default:
break;
}
return (INT_MAX);
}
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