Add regression test for CVE-2017-17053

Hi Michael,

Sorry to bother you.

tst_taint_init() always got TBROK before verifying CVE-2017-17053 on my enviorment, as below:
-----------------------------------------------------------------
[root@RHEL7U5RC_Intel64 cve]# ./cve-2017-17053 tst_test.c:987: INFO: Timeout per run is 0h 05m 00s tst_taint.c:88: BROK: Kernel is already tainted: 512
......
-----------------------------------------------------------------

On my enviorment, __ioremap_caller() displayed the warning message and set /proc/sys/kernel/tainted to
TST_TAINT_W(512) when too high physical address wasn't handled. Is this a usual case? should we break
and skip CVE-2017-17053 due to this existed TST_TAINT_W?

Please see the the following warning message:
-----------------------------------------------------------------

[    0.059261] ioremap: invalid physical address fffffffffff90000
[    0.059263] ------------[ cut here ]------------
[    0.059268] WARNING: CPU: 0 PID: 1 at arch/x86/mm/ioremap.c:103 
__ioremap_caller+0x2f2/0x340
[    0.059269] Modules linked in:
[    0.059272] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 
3.10.0-860.el7.x86_64 #1
[    0.059273] Hardware name: LENOVO QiTianM7150/To be filled by 
O.E.M., BIOS 90KT20CUS 09/14/2010
[    0.059275] Call Trace:
[    0.059281]  [<ffffffffaed0d768>] dump_stack+0x19/0x1b
[    0.059284]  [<ffffffffae6916d8>] __warn+0xd8/0x100
[    0.059286]  [<ffffffffae69181d>] warn_slowpath_null+0x1d/0x20
[    0.059288]  [<ffffffffae66f442>] __ioremap_caller+0x2f2/0x340
[    0.059290]  [<ffffffffaed0064a>] ? acpi_os_map_memory+0xfd/0x155
[    0.059293]  [<ffffffffae7f7606>] ? kmem_cache_alloc_trace+0x1d6/0x200
[    0.059295]  [<ffffffffae66f4c4>] ioremap_cache+0x14/0x20
[    0.059297]  [<ffffffffaed0064a>] acpi_os_map_memory+0xfd/0x155
[    0.059301]  [<ffffffffae9ec576>] 
acpi_ex_system_memory_space_handler+0xdd/0x1ca
[    0.059304]  [<ffffffffae9e5fa3>] 
acpi_ev_address_space_dispatch+0x1c5/0x231
[    0.059306]  [<ffffffffae9e963a>] acpi_ex_access_region+0x20e/0x2a2
[    0.059309]  [<ffffffffae9cf86d>] ? acpi_os_release_lock+0xe/0x10
[    0.059312]  [<ffffffffae9fae9c>] ? 
acpi_ut_update_ref_count+0x99/0x2bf
[    0.059314]  [<ffffffffae9e99f5>] acpi_ex_field_datum_io+0x105/0x196
[    0.059316]  [<ffffffffae9e9c0e>] 
acpi_ex_extract_from_field+0x98/0x228
[    0.059318]  [<ffffffffae9fca3a>] ? 
acpi_ut_create_internal_object_dbg+0x23/0x8a
[    0.059321]  [<ffffffffae9e91bd>] 
acpi_ex_read_data_from_field+0x13c/0x178
[    0.059323]  [<ffffffffae9ec8fc>] 
acpi_ex_resolve_node_to_value+0x1a3/0x245
[    0.059325]  [<ffffffffae9ecbbb>] acpi_ex_resolve_to_value+0x21d/0x23a
[    0.059327]  [<ffffffffae9e26c3>] 
acpi_ds_evaluate_name_path+0x8d/0x11b
[    0.059329]  [<ffffffffae9e2aaa>] acpi_ds_exec_end_op+0x98/0x3f3
[    0.059332]  [<ffffffffae9f4fb8>] acpi_ps_parse_loop+0x526/0x583
[    0.059335]  [<ffffffffae9fd618>] ? 
acpi_ut_create_generic_state+0x37/0x54
[    0.059337]  [<ffffffffae9f5ac0>] acpi_ps_parse_aml+0x98/0x289
[    0.059339]  [<ffffffffae9f6313>] acpi_ps_execute_method+0x1c7/0x272
[    0.059341]  [<ffffffffae9f0a40>] acpi_ns_evaluate+0x1c1/0x258
[    0.059343]  [<ffffffffae9f3387>] acpi_evaluate_object+0x135/0x252
[    0.059346]  [<ffffffffae9cfc7e>] acpi_evaluate_integer+0x52/0x84
[    0.059348]  [<ffffffffae9cf811>] ? acpi_os_signal_semaphore+0x21/0x2d
[    0.059350]  [<ffffffffae9d3818>] acpi_bus_get_status_handle+0x1e/0x39
[    0.059353]  [<ffffffffae9d5d1b>] acpi_bus_check_add+0x81/0x1c2
[    0.059355]  [<ffffffffae6c0d02>] ? up+0x32/0x50
[    0.059358]  [<ffffffffae9f316c>] acpi_ns_walk_namespace+0xcb/0x184
[    0.059360]  [<ffffffffae9d5c9a>] ? acpi_add_single_object+0x4f9/0x4f9
[    0.059362]  [<ffffffffae9d5c9a>] ? acpi_add_single_object+0x4f9/0x4f9
[    0.059364]  [<ffffffffae9f36a2>] acpi_walk_namespace+0x95/0xc5
[    0.059367]  [<ffffffffaf3b722b>] ? acpi_sleep_proc_init+0x2a/0x2a
[    0.059369]  [<ffffffffae9d60dd>] acpi_bus_scan+0x5c/0x90
[    0.059371]  [<ffffffffaf3b76b1>] acpi_scan_init+0x89/0x1d8
[    0.059373]  [<ffffffffaf3b74ce>] acpi_init+0x2a3/0x2bd
[    0.059376]  [<ffffffffae60210a>] do_one_initcall+0xba/0x240
[    0.059379]  [<ffffffffaf36c362>] kernel_init_freeable+0x180/0x21f
[    0.059381]  [<ffffffffaf36bb1f>] ? initcall_blacklist+0xb0/0xb0
[    0.059383]  [<ffffffffaecfc6b0>] ? rest_init+0x80/0x80
[    0.059385]  [<ffffffffaecfc6be>] kernel_init+0xe/0xf0
[    0.059388]  [<ffffffffaed1f637>] ret_from_fork_nospec_begin+0x21/0x21
[    0.059390]  [<ffffffffaecfc6b0>] ? rest_init+0x80/0x80
[    0.059393] ---[ end trace a7b32a0fce036eb7 ]---

-----------------------------------------------------------------

Please let me know if more information is needed, thanks.

Thanks,
Xiao Yang

Quoted 26 lines · Michael Moese

Add a regression test for CVE-2017-17053. This testcase is depending on some new library functions included in this series.

This patch series consists of reworked patches according to previous review comments, as well as a small new library wrapper function SAFE_SIGACTION() to install a signal handler.

Michael Moese (3):
Add library support for /proc/sys/kernel/tainted Add a library wrapper for sigaction() Add regression test for CVE-2017-17053

  doc/test-writing-guidelines.txt |  42 ++++++++++
  include/tst_safe_macros.h       |  20 +++++
  include/tst_taint.h             | 104 +++++++++++++++++++++++++
  lib/tst_taint.c                 | 106 +++++++++++++++++++++++++
  runtest/cve                     |   1 +
  testcases/cve/.gitignore        |   1 +
  testcases/cve/Makefile          |   2 +
  testcases/cve/cve-2017-17053.c  | 166 
++++++++++++++++++++++++++++++++++++++++
  8 files changed, 442 insertions(+)

create mode 100644 include/tst_taint.h create mode 100644 lib/tst_taint.c
create mode 100644 testcases/cve/cve-2017-17053.c