License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:07:57 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2015-07-31 05:31:33 +08:00
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/*
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* ldt_gdt.c - Test cases for LDT and GDT access
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* Copyright (c) 2015 Andrew Lutomirski
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*/
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#define _GNU_SOURCE
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#include <err.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <asm/ldt.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <stdbool.h>
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#include <pthread.h>
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#include <sched.h>
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#include <linux/futex.h>
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2016-04-27 03:23:31 +08:00
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#include <sys/mman.h>
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#include <asm/prctl.h>
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#include <sys/prctl.h>
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2015-07-31 05:31:33 +08:00
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#define AR_ACCESSED (1<<8)
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#define AR_TYPE_RODATA (0 * (1<<9))
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#define AR_TYPE_RWDATA (1 * (1<<9))
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#define AR_TYPE_RODATA_EXPDOWN (2 * (1<<9))
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#define AR_TYPE_RWDATA_EXPDOWN (3 * (1<<9))
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#define AR_TYPE_XOCODE (4 * (1<<9))
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#define AR_TYPE_XRCODE (5 * (1<<9))
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#define AR_TYPE_XOCODE_CONF (6 * (1<<9))
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#define AR_TYPE_XRCODE_CONF (7 * (1<<9))
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#define AR_DPL3 (3 * (1<<13))
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#define AR_S (1 << 12)
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#define AR_P (1 << 15)
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#define AR_AVL (1 << 20)
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#define AR_L (1 << 21)
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#define AR_DB (1 << 22)
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#define AR_G (1 << 23)
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2017-02-13 18:13:36 +08:00
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#ifdef __x86_64__
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# define INT80_CLOBBERS "r8", "r9", "r10", "r11"
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#else
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# define INT80_CLOBBERS
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#endif
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2015-07-31 05:31:33 +08:00
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static int nerrs;
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2016-04-27 03:23:31 +08:00
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/* Points to an array of 1024 ints, each holding its own index. */
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static const unsigned int *counter_page;
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static struct user_desc *low_user_desc;
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static struct user_desc *low_user_desc_clear; /* Use to delete GDT entry */
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static int gdt_entry_num;
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2015-07-31 05:31:33 +08:00
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static void check_invalid_segment(uint16_t index, int ldt)
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{
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uint32_t has_limit = 0, has_ar = 0, limit, ar;
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uint32_t selector = (index << 3) | (ldt << 2) | 3;
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asm ("lsl %[selector], %[limit]\n\t"
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"jnz 1f\n\t"
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"movl $1, %[has_limit]\n\t"
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"1:"
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: [limit] "=r" (limit), [has_limit] "+rm" (has_limit)
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: [selector] "r" (selector));
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asm ("larl %[selector], %[ar]\n\t"
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"jnz 1f\n\t"
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"movl $1, %[has_ar]\n\t"
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"1:"
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: [ar] "=r" (ar), [has_ar] "+rm" (has_ar)
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: [selector] "r" (selector));
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if (has_limit || has_ar) {
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printf("[FAIL]\t%s entry %hu is valid but should be invalid\n",
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(ldt ? "LDT" : "GDT"), index);
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nerrs++;
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} else {
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printf("[OK]\t%s entry %hu is invalid\n",
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(ldt ? "LDT" : "GDT"), index);
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}
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}
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static void check_valid_segment(uint16_t index, int ldt,
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uint32_t expected_ar, uint32_t expected_limit,
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bool verbose)
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{
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uint32_t has_limit = 0, has_ar = 0, limit, ar;
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uint32_t selector = (index << 3) | (ldt << 2) | 3;
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asm ("lsl %[selector], %[limit]\n\t"
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"jnz 1f\n\t"
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"movl $1, %[has_limit]\n\t"
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"1:"
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: [limit] "=r" (limit), [has_limit] "+rm" (has_limit)
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: [selector] "r" (selector));
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asm ("larl %[selector], %[ar]\n\t"
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"jnz 1f\n\t"
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"movl $1, %[has_ar]\n\t"
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"1:"
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: [ar] "=r" (ar), [has_ar] "+rm" (has_ar)
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: [selector] "r" (selector));
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if (!has_limit || !has_ar) {
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printf("[FAIL]\t%s entry %hu is invalid but should be valid\n",
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(ldt ? "LDT" : "GDT"), index);
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nerrs++;
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return;
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}
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if (ar != expected_ar) {
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printf("[FAIL]\t%s entry %hu has AR 0x%08X but expected 0x%08X\n",
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(ldt ? "LDT" : "GDT"), index, ar, expected_ar);
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nerrs++;
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} else if (limit != expected_limit) {
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printf("[FAIL]\t%s entry %hu has limit 0x%08X but expected 0x%08X\n",
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(ldt ? "LDT" : "GDT"), index, limit, expected_limit);
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nerrs++;
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} else if (verbose) {
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printf("[OK]\t%s entry %hu has AR 0x%08X and limit 0x%08X\n",
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(ldt ? "LDT" : "GDT"), index, ar, limit);
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}
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}
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static bool install_valid_mode(const struct user_desc *desc, uint32_t ar,
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bool oldmode)
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{
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int ret = syscall(SYS_modify_ldt, oldmode ? 1 : 0x11,
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desc, sizeof(*desc));
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if (ret < -1)
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errno = -ret;
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if (ret == 0) {
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uint32_t limit = desc->limit;
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if (desc->limit_in_pages)
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limit = (limit << 12) + 4095;
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check_valid_segment(desc->entry_number, 1, ar, limit, true);
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return true;
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} else if (errno == ENOSYS) {
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printf("[OK]\tmodify_ldt returned -ENOSYS\n");
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return false;
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} else {
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if (desc->seg_32bit) {
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printf("[FAIL]\tUnexpected modify_ldt failure %d\n",
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errno);
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nerrs++;
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return false;
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} else {
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printf("[OK]\tmodify_ldt rejected 16 bit segment\n");
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return false;
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}
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}
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}
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static bool install_valid(const struct user_desc *desc, uint32_t ar)
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{
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return install_valid_mode(desc, ar, false);
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}
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static void install_invalid(const struct user_desc *desc, bool oldmode)
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{
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int ret = syscall(SYS_modify_ldt, oldmode ? 1 : 0x11,
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desc, sizeof(*desc));
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if (ret < -1)
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errno = -ret;
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if (ret == 0) {
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check_invalid_segment(desc->entry_number, 1);
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} else if (errno == ENOSYS) {
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printf("[OK]\tmodify_ldt returned -ENOSYS\n");
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} else {
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if (desc->seg_32bit) {
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printf("[FAIL]\tUnexpected modify_ldt failure %d\n",
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errno);
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nerrs++;
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} else {
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printf("[OK]\tmodify_ldt rejected 16 bit segment\n");
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}
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}
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}
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static int safe_modify_ldt(int func, struct user_desc *ptr,
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unsigned long bytecount)
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{
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int ret = syscall(SYS_modify_ldt, 0x11, ptr, bytecount);
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if (ret < -1)
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errno = -ret;
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return ret;
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}
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static void fail_install(struct user_desc *desc)
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{
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if (safe_modify_ldt(0x11, desc, sizeof(*desc)) == 0) {
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printf("[FAIL]\tmodify_ldt accepted a bad descriptor\n");
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nerrs++;
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} else if (errno == ENOSYS) {
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printf("[OK]\tmodify_ldt returned -ENOSYS\n");
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} else {
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printf("[OK]\tmodify_ldt failure %d\n", errno);
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}
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}
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static void do_simple_tests(void)
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{
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struct user_desc desc = {
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.entry_number = 0,
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.base_addr = 0,
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.limit = 10,
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.seg_32bit = 1,
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.contents = 2, /* Code, not conforming */
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.read_exec_only = 0,
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.limit_in_pages = 0,
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.seg_not_present = 0,
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.useable = 0
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};
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install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE | AR_S | AR_P | AR_DB);
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desc.limit_in_pages = 1;
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install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
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AR_S | AR_P | AR_DB | AR_G);
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check_invalid_segment(1, 1);
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desc.entry_number = 2;
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install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
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AR_S | AR_P | AR_DB | AR_G);
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check_invalid_segment(1, 1);
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desc.base_addr = 0xf0000000;
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install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
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AR_S | AR_P | AR_DB | AR_G);
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desc.useable = 1;
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install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
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AR_S | AR_P | AR_DB | AR_G | AR_AVL);
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desc.seg_not_present = 1;
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install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
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AR_S | AR_DB | AR_G | AR_AVL);
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desc.seg_32bit = 0;
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install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
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AR_S | AR_G | AR_AVL);
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desc.seg_32bit = 1;
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desc.contents = 0;
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install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA |
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AR_S | AR_DB | AR_G | AR_AVL);
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desc.read_exec_only = 1;
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install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA |
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AR_S | AR_DB | AR_G | AR_AVL);
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desc.contents = 1;
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install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA_EXPDOWN |
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AR_S | AR_DB | AR_G | AR_AVL);
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desc.read_exec_only = 0;
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desc.limit_in_pages = 0;
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install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA_EXPDOWN |
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AR_S | AR_DB | AR_AVL);
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desc.contents = 3;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE_CONF |
|
|
|
|
AR_S | AR_DB | AR_AVL);
|
|
|
|
|
|
|
|
desc.read_exec_only = 1;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_XOCODE_CONF |
|
|
|
|
AR_S | AR_DB | AR_AVL);
|
|
|
|
|
|
|
|
desc.read_exec_only = 0;
|
|
|
|
desc.contents = 2;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
|
|
|
|
AR_S | AR_DB | AR_AVL);
|
|
|
|
|
|
|
|
desc.read_exec_only = 1;
|
|
|
|
|
|
|
|
#ifdef __x86_64__
|
|
|
|
desc.lm = 1;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_XOCODE |
|
|
|
|
AR_S | AR_DB | AR_AVL);
|
|
|
|
desc.lm = 0;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
bool entry1_okay = install_valid(&desc, AR_DPL3 | AR_TYPE_XOCODE |
|
|
|
|
AR_S | AR_DB | AR_AVL);
|
|
|
|
|
|
|
|
if (entry1_okay) {
|
|
|
|
printf("[RUN]\tTest fork\n");
|
|
|
|
pid_t child = fork();
|
|
|
|
if (child == 0) {
|
|
|
|
nerrs = 0;
|
|
|
|
check_valid_segment(desc.entry_number, 1,
|
|
|
|
AR_DPL3 | AR_TYPE_XOCODE |
|
|
|
|
AR_S | AR_DB | AR_AVL, desc.limit,
|
|
|
|
true);
|
|
|
|
check_invalid_segment(1, 1);
|
|
|
|
exit(nerrs ? 1 : 0);
|
|
|
|
} else {
|
|
|
|
int status;
|
|
|
|
if (waitpid(child, &status, 0) != child ||
|
|
|
|
!WIFEXITED(status)) {
|
|
|
|
printf("[FAIL]\tChild died\n");
|
|
|
|
nerrs++;
|
|
|
|
} else if (WEXITSTATUS(status) != 0) {
|
|
|
|
printf("[FAIL]\tChild failed\n");
|
|
|
|
nerrs++;
|
|
|
|
} else {
|
|
|
|
printf("[OK]\tChild succeeded\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
printf("[RUN]\tTest size\n");
|
|
|
|
int i;
|
|
|
|
for (i = 0; i < 8192; i++) {
|
|
|
|
desc.entry_number = i;
|
|
|
|
desc.limit = i;
|
|
|
|
if (safe_modify_ldt(0x11, &desc, sizeof(desc)) != 0) {
|
|
|
|
printf("[FAIL]\tFailed to install entry %d\n", i);
|
|
|
|
nerrs++;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for (int j = 0; j < i; j++) {
|
|
|
|
check_valid_segment(j, 1, AR_DPL3 | AR_TYPE_XOCODE |
|
|
|
|
AR_S | AR_DB | AR_AVL, j, false);
|
|
|
|
}
|
|
|
|
printf("[DONE]\tSize test\n");
|
|
|
|
} else {
|
|
|
|
printf("[SKIP]\tSkipping fork and size tests because we have no LDT\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Test entry_number too high. */
|
|
|
|
desc.entry_number = 8192;
|
|
|
|
fail_install(&desc);
|
|
|
|
|
|
|
|
/* Test deletion and actions mistakeable for deletion. */
|
|
|
|
memset(&desc, 0, sizeof(desc));
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S | AR_P);
|
|
|
|
|
|
|
|
desc.seg_not_present = 1;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S);
|
|
|
|
|
|
|
|
desc.seg_not_present = 0;
|
|
|
|
desc.read_exec_only = 1;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA | AR_S | AR_P);
|
|
|
|
|
|
|
|
desc.read_exec_only = 0;
|
|
|
|
desc.seg_not_present = 1;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S);
|
|
|
|
|
|
|
|
desc.read_exec_only = 1;
|
|
|
|
desc.limit = 1;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA | AR_S);
|
|
|
|
|
|
|
|
desc.limit = 0;
|
|
|
|
desc.base_addr = 1;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA | AR_S);
|
|
|
|
|
|
|
|
desc.base_addr = 0;
|
|
|
|
install_invalid(&desc, false);
|
|
|
|
|
|
|
|
desc.seg_not_present = 0;
|
|
|
|
desc.read_exec_only = 0;
|
|
|
|
desc.seg_32bit = 1;
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S | AR_P | AR_DB);
|
|
|
|
install_invalid(&desc, true);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 0: thread is idle
|
|
|
|
* 1: thread armed
|
|
|
|
* 2: thread should clear LDT entry 0
|
|
|
|
* 3: thread should exit
|
|
|
|
*/
|
|
|
|
static volatile unsigned int ftx;
|
|
|
|
|
|
|
|
static void *threadproc(void *ctx)
|
|
|
|
{
|
|
|
|
cpu_set_t cpuset;
|
|
|
|
CPU_ZERO(&cpuset);
|
|
|
|
CPU_SET(1, &cpuset);
|
|
|
|
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0)
|
|
|
|
err(1, "sched_setaffinity to CPU 1"); /* should never fail */
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
syscall(SYS_futex, &ftx, FUTEX_WAIT, 0, NULL, NULL, 0);
|
|
|
|
while (ftx != 2) {
|
|
|
|
if (ftx >= 3)
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* clear LDT entry 0 */
|
|
|
|
const struct user_desc desc = {};
|
|
|
|
if (syscall(SYS_modify_ldt, 1, &desc, sizeof(desc)) != 0)
|
|
|
|
err(1, "modify_ldt");
|
|
|
|
|
|
|
|
/* If ftx == 2, set it to zero. If ftx == 100, quit. */
|
|
|
|
unsigned int x = -2;
|
|
|
|
asm volatile ("lock xaddl %[x], %[ftx]" :
|
|
|
|
[x] "+r" (x), [ftx] "+m" (ftx));
|
|
|
|
if (x != 2)
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-03-23 05:32:29 +08:00
|
|
|
#ifdef __i386__
|
|
|
|
|
|
|
|
#ifndef SA_RESTORE
|
|
|
|
#define SA_RESTORER 0x04000000
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The UAPI header calls this 'struct sigaction', which conflicts with
|
|
|
|
* glibc. Sigh.
|
|
|
|
*/
|
|
|
|
struct fake_ksigaction {
|
|
|
|
void *handler; /* the real type is nasty */
|
|
|
|
unsigned long sa_flags;
|
|
|
|
void (*sa_restorer)(void);
|
|
|
|
unsigned char sigset[8];
|
|
|
|
};
|
|
|
|
|
|
|
|
static void fix_sa_restorer(int sig)
|
|
|
|
{
|
|
|
|
struct fake_ksigaction ksa;
|
|
|
|
|
|
|
|
if (syscall(SYS_rt_sigaction, sig, NULL, &ksa, 8) == 0) {
|
|
|
|
/*
|
|
|
|
* glibc has a nasty bug: it sometimes writes garbage to
|
|
|
|
* sa_restorer. This interacts quite badly with anything
|
|
|
|
* that fiddles with SS because it can trigger legacy
|
|
|
|
* stack switching. Patch it up. See:
|
|
|
|
*
|
|
|
|
* https://sourceware.org/bugzilla/show_bug.cgi?id=21269
|
|
|
|
*/
|
|
|
|
if (!(ksa.sa_flags & SA_RESTORER) && ksa.sa_restorer) {
|
|
|
|
ksa.sa_restorer = NULL;
|
|
|
|
if (syscall(SYS_rt_sigaction, sig, &ksa, NULL,
|
|
|
|
sizeof(ksa.sigset)) != 0)
|
|
|
|
err(1, "rt_sigaction");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static void fix_sa_restorer(int sig)
|
|
|
|
{
|
|
|
|
/* 64-bit glibc works fine. */
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2015-07-31 05:31:33 +08:00
|
|
|
static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
|
|
|
|
int flags)
|
|
|
|
{
|
|
|
|
struct sigaction sa;
|
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
|
|
sa.sa_sigaction = handler;
|
|
|
|
sa.sa_flags = SA_SIGINFO | flags;
|
|
|
|
sigemptyset(&sa.sa_mask);
|
|
|
|
if (sigaction(sig, &sa, 0))
|
|
|
|
err(1, "sigaction");
|
|
|
|
|
2017-03-23 05:32:29 +08:00
|
|
|
fix_sa_restorer(sig);
|
2015-07-31 05:31:33 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static jmp_buf jmpbuf;
|
|
|
|
|
|
|
|
static void sigsegv(int sig, siginfo_t *info, void *ctx_void)
|
|
|
|
{
|
|
|
|
siglongjmp(jmpbuf, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void do_multicpu_tests(void)
|
|
|
|
{
|
|
|
|
cpu_set_t cpuset;
|
|
|
|
pthread_t thread;
|
|
|
|
int failures = 0, iters = 5, i;
|
|
|
|
unsigned short orig_ss;
|
|
|
|
|
|
|
|
CPU_ZERO(&cpuset);
|
|
|
|
CPU_SET(1, &cpuset);
|
|
|
|
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
|
|
|
|
printf("[SKIP]\tCannot set affinity to CPU 1\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
CPU_ZERO(&cpuset);
|
|
|
|
CPU_SET(0, &cpuset);
|
|
|
|
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
|
|
|
|
printf("[SKIP]\tCannot set affinity to CPU 0\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
sethandler(SIGSEGV, sigsegv, 0);
|
|
|
|
#ifdef __i386__
|
|
|
|
/* True 32-bit kernels send SIGILL instead of SIGSEGV on IRET faults. */
|
|
|
|
sethandler(SIGILL, sigsegv, 0);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
printf("[RUN]\tCross-CPU LDT invalidation\n");
|
|
|
|
|
|
|
|
if (pthread_create(&thread, 0, threadproc, 0) != 0)
|
|
|
|
err(1, "pthread_create");
|
|
|
|
|
|
|
|
asm volatile ("mov %%ss, %0" : "=rm" (orig_ss));
|
|
|
|
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
|
|
if (sigsetjmp(jmpbuf, 1) != 0)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
/* Make sure the thread is ready after the last test. */
|
|
|
|
while (ftx != 0)
|
|
|
|
;
|
|
|
|
|
|
|
|
struct user_desc desc = {
|
|
|
|
.entry_number = 0,
|
|
|
|
.base_addr = 0,
|
|
|
|
.limit = 0xfffff,
|
|
|
|
.seg_32bit = 1,
|
|
|
|
.contents = 0, /* Data */
|
|
|
|
.read_exec_only = 0,
|
|
|
|
.limit_in_pages = 1,
|
|
|
|
.seg_not_present = 0,
|
|
|
|
.useable = 0
|
|
|
|
};
|
|
|
|
|
|
|
|
if (safe_modify_ldt(0x11, &desc, sizeof(desc)) != 0) {
|
|
|
|
if (errno != ENOSYS)
|
|
|
|
err(1, "modify_ldt");
|
|
|
|
printf("[SKIP]\tmodify_ldt unavailable\n");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Arm the thread. */
|
|
|
|
ftx = 1;
|
|
|
|
syscall(SYS_futex, &ftx, FUTEX_WAKE, 0, NULL, NULL, 0);
|
|
|
|
|
|
|
|
asm volatile ("mov %0, %%ss" : : "r" (0x7));
|
|
|
|
|
|
|
|
/* Go! */
|
|
|
|
ftx = 2;
|
|
|
|
|
|
|
|
while (ftx != 0)
|
|
|
|
;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* On success, modify_ldt will segfault us synchronously,
|
|
|
|
* and we'll escape via siglongjmp.
|
|
|
|
*/
|
|
|
|
|
|
|
|
failures++;
|
|
|
|
asm volatile ("mov %0, %%ss" : : "rm" (orig_ss));
|
|
|
|
};
|
|
|
|
|
|
|
|
ftx = 100; /* Kill the thread. */
|
|
|
|
syscall(SYS_futex, &ftx, FUTEX_WAKE, 0, NULL, NULL, 0);
|
|
|
|
|
|
|
|
if (pthread_join(thread, NULL) != 0)
|
|
|
|
err(1, "pthread_join");
|
|
|
|
|
|
|
|
if (failures) {
|
|
|
|
printf("[FAIL]\t%d of %d iterations failed\n", failures, iters);
|
|
|
|
nerrs++;
|
|
|
|
} else {
|
|
|
|
printf("[OK]\tAll %d iterations succeeded\n", iters);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int finish_exec_test(void)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* In a sensible world, this would be check_invalid_segment(0, 1);
|
|
|
|
* For better or for worse, though, the LDT is inherited across exec.
|
|
|
|
* We can probably change this safely, but for now we test it.
|
|
|
|
*/
|
|
|
|
check_valid_segment(0, 1,
|
|
|
|
AR_DPL3 | AR_TYPE_XRCODE | AR_S | AR_P | AR_DB,
|
|
|
|
42, true);
|
|
|
|
|
|
|
|
return nerrs ? 1 : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void do_exec_test(void)
|
|
|
|
{
|
|
|
|
printf("[RUN]\tTest exec\n");
|
|
|
|
|
|
|
|
struct user_desc desc = {
|
|
|
|
.entry_number = 0,
|
|
|
|
.base_addr = 0,
|
|
|
|
.limit = 42,
|
|
|
|
.seg_32bit = 1,
|
|
|
|
.contents = 2, /* Code, not conforming */
|
|
|
|
.read_exec_only = 0,
|
|
|
|
.limit_in_pages = 0,
|
|
|
|
.seg_not_present = 0,
|
|
|
|
.useable = 0
|
|
|
|
};
|
|
|
|
install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE | AR_S | AR_P | AR_DB);
|
|
|
|
|
|
|
|
pid_t child = fork();
|
|
|
|
if (child == 0) {
|
|
|
|
execl("/proc/self/exe", "ldt_gdt_test_exec", NULL);
|
|
|
|
printf("[FAIL]\tCould not exec self\n");
|
|
|
|
exit(1); /* exec failed */
|
|
|
|
} else {
|
|
|
|
int status;
|
|
|
|
if (waitpid(child, &status, 0) != child ||
|
|
|
|
!WIFEXITED(status)) {
|
|
|
|
printf("[FAIL]\tChild died\n");
|
|
|
|
nerrs++;
|
|
|
|
} else if (WEXITSTATUS(status) != 0) {
|
|
|
|
printf("[FAIL]\tChild failed\n");
|
|
|
|
nerrs++;
|
|
|
|
} else {
|
|
|
|
printf("[OK]\tChild succeeded\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-04-27 03:23:31 +08:00
|
|
|
static void setup_counter_page(void)
|
|
|
|
{
|
|
|
|
unsigned int *page = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
|
|
|
|
MAP_ANONYMOUS | MAP_PRIVATE | MAP_32BIT, -1, 0);
|
|
|
|
if (page == MAP_FAILED)
|
|
|
|
err(1, "mmap");
|
|
|
|
|
|
|
|
for (int i = 0; i < 1024; i++)
|
|
|
|
page[i] = i;
|
|
|
|
counter_page = page;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int invoke_set_thread_area(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
asm volatile ("int $0x80"
|
|
|
|
: "=a" (ret), "+m" (low_user_desc) :
|
|
|
|
"a" (243), "b" (low_user_desc)
|
2017-02-13 18:13:36 +08:00
|
|
|
: INT80_CLOBBERS);
|
2016-04-27 03:23:31 +08:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void setup_low_user_desc(void)
|
|
|
|
{
|
|
|
|
low_user_desc = mmap(NULL, 2 * sizeof(struct user_desc),
|
|
|
|
PROT_READ | PROT_WRITE,
|
|
|
|
MAP_ANONYMOUS | MAP_PRIVATE | MAP_32BIT, -1, 0);
|
|
|
|
if (low_user_desc == MAP_FAILED)
|
|
|
|
err(1, "mmap");
|
|
|
|
|
|
|
|
low_user_desc->entry_number = -1;
|
|
|
|
low_user_desc->base_addr = (unsigned long)&counter_page[1];
|
|
|
|
low_user_desc->limit = 0xfffff;
|
|
|
|
low_user_desc->seg_32bit = 1;
|
|
|
|
low_user_desc->contents = 0; /* Data, grow-up*/
|
|
|
|
low_user_desc->read_exec_only = 0;
|
|
|
|
low_user_desc->limit_in_pages = 1;
|
|
|
|
low_user_desc->seg_not_present = 0;
|
|
|
|
low_user_desc->useable = 0;
|
|
|
|
|
|
|
|
if (invoke_set_thread_area() == 0) {
|
|
|
|
gdt_entry_num = low_user_desc->entry_number;
|
|
|
|
printf("[NOTE]\tset_thread_area is available; will use GDT index %d\n", gdt_entry_num);
|
|
|
|
} else {
|
|
|
|
printf("[NOTE]\tset_thread_area is unavailable\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
low_user_desc_clear = low_user_desc + 1;
|
|
|
|
low_user_desc_clear->entry_number = gdt_entry_num;
|
|
|
|
low_user_desc_clear->read_exec_only = 1;
|
|
|
|
low_user_desc_clear->seg_not_present = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void test_gdt_invalidation(void)
|
|
|
|
{
|
|
|
|
if (!gdt_entry_num)
|
|
|
|
return; /* 64-bit only system -- we can't use set_thread_area */
|
|
|
|
|
|
|
|
unsigned short prev_sel;
|
|
|
|
unsigned short sel;
|
|
|
|
unsigned int eax;
|
|
|
|
const char *result;
|
|
|
|
#ifdef __x86_64__
|
|
|
|
unsigned long saved_base;
|
|
|
|
unsigned long new_base;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Test DS */
|
|
|
|
invoke_set_thread_area();
|
|
|
|
eax = 243;
|
|
|
|
sel = (gdt_entry_num << 3) | 3;
|
|
|
|
asm volatile ("movw %%ds, %[prev_sel]\n\t"
|
|
|
|
"movw %[sel], %%ds\n\t"
|
|
|
|
#ifdef __i386__
|
|
|
|
"pushl %%ebx\n\t"
|
|
|
|
#endif
|
|
|
|
"movl %[arg1], %%ebx\n\t"
|
|
|
|
"int $0x80\n\t" /* Should invalidate ds */
|
|
|
|
#ifdef __i386__
|
|
|
|
"popl %%ebx\n\t"
|
|
|
|
#endif
|
|
|
|
"movw %%ds, %[sel]\n\t"
|
|
|
|
"movw %[prev_sel], %%ds"
|
|
|
|
: [prev_sel] "=&r" (prev_sel), [sel] "+r" (sel),
|
|
|
|
"+a" (eax)
|
|
|
|
: "m" (low_user_desc_clear),
|
|
|
|
[arg1] "r" ((unsigned int)(unsigned long)low_user_desc_clear)
|
2017-02-13 18:13:36 +08:00
|
|
|
: INT80_CLOBBERS);
|
2016-04-27 03:23:31 +08:00
|
|
|
|
|
|
|
if (sel != 0) {
|
|
|
|
result = "FAIL";
|
|
|
|
nerrs++;
|
|
|
|
} else {
|
|
|
|
result = "OK";
|
|
|
|
}
|
|
|
|
printf("[%s]\tInvalidate DS with set_thread_area: new DS = 0x%hx\n",
|
|
|
|
result, sel);
|
|
|
|
|
|
|
|
/* Test ES */
|
|
|
|
invoke_set_thread_area();
|
|
|
|
eax = 243;
|
|
|
|
sel = (gdt_entry_num << 3) | 3;
|
|
|
|
asm volatile ("movw %%es, %[prev_sel]\n\t"
|
|
|
|
"movw %[sel], %%es\n\t"
|
|
|
|
#ifdef __i386__
|
|
|
|
"pushl %%ebx\n\t"
|
|
|
|
#endif
|
|
|
|
"movl %[arg1], %%ebx\n\t"
|
|
|
|
"int $0x80\n\t" /* Should invalidate es */
|
|
|
|
#ifdef __i386__
|
|
|
|
"popl %%ebx\n\t"
|
|
|
|
#endif
|
|
|
|
"movw %%es, %[sel]\n\t"
|
|
|
|
"movw %[prev_sel], %%es"
|
|
|
|
: [prev_sel] "=&r" (prev_sel), [sel] "+r" (sel),
|
|
|
|
"+a" (eax)
|
|
|
|
: "m" (low_user_desc_clear),
|
|
|
|
[arg1] "r" ((unsigned int)(unsigned long)low_user_desc_clear)
|
2017-02-13 18:13:36 +08:00
|
|
|
: INT80_CLOBBERS);
|
2016-04-27 03:23:31 +08:00
|
|
|
|
|
|
|
if (sel != 0) {
|
|
|
|
result = "FAIL";
|
|
|
|
nerrs++;
|
|
|
|
} else {
|
|
|
|
result = "OK";
|
|
|
|
}
|
|
|
|
printf("[%s]\tInvalidate ES with set_thread_area: new ES = 0x%hx\n",
|
|
|
|
result, sel);
|
|
|
|
|
|
|
|
/* Test FS */
|
|
|
|
invoke_set_thread_area();
|
|
|
|
eax = 243;
|
|
|
|
sel = (gdt_entry_num << 3) | 3;
|
|
|
|
#ifdef __x86_64__
|
|
|
|
syscall(SYS_arch_prctl, ARCH_GET_FS, &saved_base);
|
|
|
|
#endif
|
|
|
|
asm volatile ("movw %%fs, %[prev_sel]\n\t"
|
|
|
|
"movw %[sel], %%fs\n\t"
|
|
|
|
#ifdef __i386__
|
|
|
|
"pushl %%ebx\n\t"
|
|
|
|
#endif
|
|
|
|
"movl %[arg1], %%ebx\n\t"
|
|
|
|
"int $0x80\n\t" /* Should invalidate fs */
|
|
|
|
#ifdef __i386__
|
|
|
|
"popl %%ebx\n\t"
|
|
|
|
#endif
|
|
|
|
"movw %%fs, %[sel]\n\t"
|
|
|
|
: [prev_sel] "=&r" (prev_sel), [sel] "+r" (sel),
|
|
|
|
"+a" (eax)
|
|
|
|
: "m" (low_user_desc_clear),
|
|
|
|
[arg1] "r" ((unsigned int)(unsigned long)low_user_desc_clear)
|
2017-02-13 18:13:36 +08:00
|
|
|
: INT80_CLOBBERS);
|
2016-04-27 03:23:31 +08:00
|
|
|
|
|
|
|
#ifdef __x86_64__
|
|
|
|
syscall(SYS_arch_prctl, ARCH_GET_FS, &new_base);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Restore FS/BASE for glibc */
|
|
|
|
asm volatile ("movw %[prev_sel], %%fs" : : [prev_sel] "rm" (prev_sel));
|
|
|
|
#ifdef __x86_64__
|
|
|
|
if (saved_base)
|
|
|
|
syscall(SYS_arch_prctl, ARCH_SET_FS, saved_base);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (sel != 0) {
|
|
|
|
result = "FAIL";
|
|
|
|
nerrs++;
|
|
|
|
} else {
|
|
|
|
result = "OK";
|
|
|
|
}
|
|
|
|
printf("[%s]\tInvalidate FS with set_thread_area: new FS = 0x%hx\n",
|
|
|
|
result, sel);
|
|
|
|
|
|
|
|
#ifdef __x86_64__
|
|
|
|
if (sel == 0 && new_base != 0) {
|
|
|
|
nerrs++;
|
|
|
|
printf("[FAIL]\tNew FSBASE was 0x%lx\n", new_base);
|
|
|
|
} else {
|
|
|
|
printf("[OK]\tNew FSBASE was zero\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Test GS */
|
|
|
|
invoke_set_thread_area();
|
|
|
|
eax = 243;
|
|
|
|
sel = (gdt_entry_num << 3) | 3;
|
|
|
|
#ifdef __x86_64__
|
|
|
|
syscall(SYS_arch_prctl, ARCH_GET_GS, &saved_base);
|
|
|
|
#endif
|
|
|
|
asm volatile ("movw %%gs, %[prev_sel]\n\t"
|
|
|
|
"movw %[sel], %%gs\n\t"
|
|
|
|
#ifdef __i386__
|
|
|
|
"pushl %%ebx\n\t"
|
|
|
|
#endif
|
|
|
|
"movl %[arg1], %%ebx\n\t"
|
|
|
|
"int $0x80\n\t" /* Should invalidate gs */
|
|
|
|
#ifdef __i386__
|
|
|
|
"popl %%ebx\n\t"
|
|
|
|
#endif
|
|
|
|
"movw %%gs, %[sel]\n\t"
|
|
|
|
: [prev_sel] "=&r" (prev_sel), [sel] "+r" (sel),
|
|
|
|
"+a" (eax)
|
|
|
|
: "m" (low_user_desc_clear),
|
|
|
|
[arg1] "r" ((unsigned int)(unsigned long)low_user_desc_clear)
|
2017-02-13 18:13:36 +08:00
|
|
|
: INT80_CLOBBERS);
|
2016-04-27 03:23:31 +08:00
|
|
|
|
|
|
|
#ifdef __x86_64__
|
|
|
|
syscall(SYS_arch_prctl, ARCH_GET_GS, &new_base);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Restore GS/BASE for glibc */
|
|
|
|
asm volatile ("movw %[prev_sel], %%gs" : : [prev_sel] "rm" (prev_sel));
|
|
|
|
#ifdef __x86_64__
|
|
|
|
if (saved_base)
|
|
|
|
syscall(SYS_arch_prctl, ARCH_SET_GS, saved_base);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (sel != 0) {
|
|
|
|
result = "FAIL";
|
|
|
|
nerrs++;
|
|
|
|
} else {
|
|
|
|
result = "OK";
|
|
|
|
}
|
|
|
|
printf("[%s]\tInvalidate GS with set_thread_area: new GS = 0x%hx\n",
|
|
|
|
result, sel);
|
|
|
|
|
|
|
|
#ifdef __x86_64__
|
|
|
|
if (sel == 0 && new_base != 0) {
|
|
|
|
nerrs++;
|
|
|
|
printf("[FAIL]\tNew GSBASE was 0x%lx\n", new_base);
|
|
|
|
} else {
|
|
|
|
printf("[OK]\tNew GSBASE was zero\n");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2015-07-31 05:31:33 +08:00
|
|
|
int main(int argc, char **argv)
|
|
|
|
{
|
|
|
|
if (argc == 1 && !strcmp(argv[0], "ldt_gdt_test_exec"))
|
|
|
|
return finish_exec_test();
|
|
|
|
|
2016-04-27 03:23:31 +08:00
|
|
|
setup_counter_page();
|
|
|
|
setup_low_user_desc();
|
|
|
|
|
2015-07-31 05:31:33 +08:00
|
|
|
do_simple_tests();
|
|
|
|
|
|
|
|
do_multicpu_tests();
|
|
|
|
|
|
|
|
do_exec_test();
|
|
|
|
|
2016-04-27 03:23:31 +08:00
|
|
|
test_gdt_invalidation();
|
|
|
|
|
2015-07-31 05:31:33 +08:00
|
|
|
return nerrs ? 1 : 0;
|
|
|
|
}
|