aboutsummaryrefslogtreecommitdiff
path: root/gnu/packages/patches/glibc-2.27-git-fixes.patch
blob: 4ed67c7c25db643f4eecbdb14225b85b93caebec (about) (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
These commits are cherry-picked from the "release/2.27/master" branch.

https://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/release/2.27/master

Currently, we have the following (with NEWS and ChangeLog entries omitted).

56170e064e2b21ce204f0817733e92f1730541ea
516fa6080481a1433c173320b1c1432868e1e38a
f36553bf6a4f69070f99badbdab5802b43e6e211
7c6304182b9f422b782ace1cdd3efbde056aec36
78a90c2f74a2012dd3eff302189e47ff6779a757
1e52d8e65a58c49a48549053a1b89c06240e0c6c
55ad82e45c313454de657931898e974a7a036cad

From 56170e064e2b21ce204f0817733e92f1730541ea Mon Sep 17 00:00:00 2001
From: Igor Gnatenko <ignatenko@redhat.com>
Date: Wed, 7 Feb 2018 13:53:10 +0100
Subject: [PATCH] Linux: use reserved name __key in pkey_get [BZ #22797]

_key is not reserved name and we should avoid using that. It seems that
it was simple typo when pkey_* was implemented.

(cherry picked from commit 388ff7bd0d57d7061fdd39a2f26f65687e8058da)

diff --git a/sysdeps/unix/sysv/linux/bits/mman-shared.h b/sysdeps/unix/sysv/linux/bits/mman-shared.h
index 7715e680ca..d15ba95c9d 100644
--- a/sysdeps/unix/sysv/linux/bits/mman-shared.h
+++ b/sysdeps/unix/sysv/linux/bits/mman-shared.h
@@ -61,7 +61,7 @@ int pkey_set (int __key, unsigned int __access_rights) __THROW;
 
 /* Return the access rights for the current thread for KEY, which must
    have been allocated using pkey_alloc.  */
-int pkey_get (int _key) __THROW;
+int pkey_get (int __key) __THROW;
 
 /* Free an allocated protection key, which must have been allocated
    using pkey_alloc.  */

From 516fa6080481a1433c173320b1c1432868e1e38a Mon Sep 17 00:00:00 2001
From: "Dmitry V. Levin" <ldv@altlinux.org>
Date: Fri, 29 Dec 2017 23:19:32 +0000
Subject: [PATCH] linux/aarch64: sync sys/ptrace.h with Linux 4.15 [BZ #22433]

Remove compat-specific constants that were never exported by kernel
headers under these names.  Before linux commit v3.7-rc1~16^2~1 they
were exported with COMPAT_ prefix, and since that commit they are not
exported at all.

* sysdeps/unix/sysv/linux/aarch64/sys/ptrace.h (__ptrace_request):
Remove arm-specific PTRACE_GET_THREAD_AREA, PTRACE_GETHBPREGS,
and PTRACE_SETHBPREGS.

(cherry picked from commit 2fd4bbaa1446f1be700e10c526cf585a796c4991)

diff --git a/sysdeps/unix/sysv/linux/aarch64/sys/ptrace.h b/sysdeps/unix/sysv/linux/aarch64/sys/ptrace.h
index 4be45b95ff..444edbb702 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sys/ptrace.h
+++ b/sysdeps/unix/sysv/linux/aarch64/sys/ptrace.h
@@ -78,18 +78,10 @@ enum __ptrace_request
   PTRACE_DETACH = 17,
 #define PT_DETACH PTRACE_DETACH
 
-  PTRACE_GET_THREAD_AREA = 22,
-
   /* Continue and stop at the next entry to or return from syscall.  */
   PTRACE_SYSCALL = 24,
 #define PT_SYSCALL PTRACE_SYSCALL
 
-  /* Get all hardware breakpoint registers.  */
-  PTRACE_GETHBPREGS = 29,
-
-  /* Set all hardware breakpoint registers.  */
-  PTRACE_SETHBPREGS = 30,
-
   /* Set ptrace filter options.  */
   PTRACE_SETOPTIONS = 0x4200,
 #define PT_SETOPTIONS PTRACE_SETOPTIONS

From f36553bf6a4f69070f99badbdab5802b43e6e211 Mon Sep 17 00:00:00 2001
From: Mike FABIAN <mfabian@redhat.com>
Date: Mon, 19 Feb 2018 21:59:30 +0100
Subject: [PATCH] =?UTF-8?q?Add=20missing=20=E2=80=9Creorder-end=E2=80=9D?=
 =?UTF-8?q?=20in=20LC=5FCOLLATE=20of=20et=5FEE=20[BZ=20#22517]?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

	[BZ #22517]
	* localedata/locales/et_EE (LC_COLLATE): add missing “reorder-end”

(cherry picked from commit 7ec5f9465e732e668d0dc94ac078ba68056d6d0a)

diff --git a/localedata/locales/et_EE b/localedata/locales/et_EE
index 9cb55b568f..bab7493c98 100644
--- a/localedata/locales/et_EE
+++ b/localedata/locales/et_EE
@@ -103,6 +103,8 @@ reorder-after <w>
 <U00FC> <u-diaresis>;<BAS>;<MIN>;IGNORE % ü
 <U00DC> <u-diaresis>;<BAS>;<CAP>;IGNORE % Ü
 
+reorder-end
+
 END LC_COLLATE
 
 LC_CTYPE

From 7c6304182b9f422b782ace1cdd3efbde056aec36 Mon Sep 17 00:00:00 2001
From: DJ Delorie <dj@redhat.com>
Date: Thu, 1 Mar 2018 23:20:45 -0500
Subject: [PATCH] [BZ #22342] Fix netgroup cache keys.

Unlike other nscd caches, the netgroup cache contains two types of
records - those for "iterate through a netgroup" (i.e. setnetgrent())
and those for "is this user in this netgroup" (i.e. innetgr()),
i.e. full and partial records.  The timeout code assumes these records
have the same key for the group name, so that the collection of records
that is "this netgroup" can be expired as a unit.

However, the keys are not the same, as the in-netgroup key is generated
by nscd rather than being passed to it from elsewhere, and is generated
without the trailing NUL.  All other keys have the trailing NUL, and as
noted in the linked BZ, debug statements confirm that two keys for the
same netgroup are added to the cache with two different lengths.

The result of this is that as records in the cache expire, the purge
code only cleans out one of the two types of entries, resulting in
stale, possibly incorrect, and possibly inconsistent cache data.

The patch simply includes the existing NUL in the computation for the
key length ('key' points to the char after the NUL, and 'group' to the
first char of the group, so 'key-group' includes the first char to the
NUL, inclusive).

	[BZ #22342]
	* nscd/netgroupcache.c (addinnetgrX): Include trailing NUL in
	key value.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 1c81d55fc4b07b51adf68558ba74ce975153e580)

diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index b832c9315f..2f187b208c 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -480,7 +480,7 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
 {
   const char *group = key;
   key = (char *) rawmemchr (key, '\0') + 1;
-  size_t group_len = key - group - 1;
+  size_t group_len = key - group;
   const char *host = *key++ ? key : NULL;
   if (host != NULL)
     key = (char *) rawmemchr (key, '\0') + 1;

From 78a90c2f74a2012dd3eff302189e47ff6779a757 Mon Sep 17 00:00:00 2001
From: Andreas Schwab <schwab@linux-m68k.org>
Date: Fri, 2 Mar 2018 23:07:14 +0100
Subject: [PATCH] Fix multiple definitions of __nss_*_database (bug 22918)

(cherry picked from commit eaf6753f8aac33a36deb98c1031d1bad7b593d2d)

diff --git a/nscd/gai.c b/nscd/gai.c
index d081747797..576fd0045b 100644
--- a/nscd/gai.c
+++ b/nscd/gai.c
@@ -45,3 +45,6 @@
 #ifdef HAVE_LIBIDN
 # include <libidn/idn-stub.c>
 #endif
+
+/* Some variables normally defined in libc.  */
+service_user *__nss_hosts_database attribute_hidden;
diff --git a/nss/nsswitch.c b/nss/nsswitch.c
index d5e655974f..b0f0c11a3e 100644
--- a/nss/nsswitch.c
+++ b/nss/nsswitch.c
@@ -62,7 +62,7 @@ static service_library *nss_new_service (name_database *database,
 
 /* Declare external database variables.  */
 #define DEFINE_DATABASE(name)						      \
-  extern service_user *__nss_##name##_database attribute_hidden;	      \
+  service_user *__nss_##name##_database attribute_hidden;		      \
   weak_extern (__nss_##name##_database)
 #include "databases.def"
 #undef DEFINE_DATABASE
diff --git a/nss/nsswitch.h b/nss/nsswitch.h
index eccb535ef5..63573b9ebc 100644
--- a/nss/nsswitch.h
+++ b/nss/nsswitch.h
@@ -226,10 +226,10 @@ libc_hidden_proto (__nss_hostname_digits_dots)
 #define MAX_NR_ADDRS    48
 
 /* Prototypes for __nss_*_lookup2 functions.  */
-#define DEFINE_DATABASE(arg)				    \
-  service_user *__nss_##arg##_database attribute_hidden;    \
-  int __nss_##arg##_lookup2 (service_user **, const char *, \
-			     const char *, void **);	    \
+#define DEFINE_DATABASE(arg)						      \
+  extern service_user *__nss_##arg##_database attribute_hidden;		      \
+  int __nss_##arg##_lookup2 (service_user **, const char *,		      \
+			     const char *, void **);			      \
   libc_hidden_proto (__nss_##arg##_lookup2)
 #include "databases.def"
 #undef DEFINE_DATABASE
diff --git a/posix/tst-rfc3484-2.c b/posix/tst-rfc3484-2.c
index f509534ca9..8c64ac59ff 100644
--- a/posix/tst-rfc3484-2.c
+++ b/posix/tst-rfc3484-2.c
@@ -58,6 +58,7 @@ _res_hconf_init (void)
 #undef	USE_NSCD
 #include "../sysdeps/posix/getaddrinfo.c"
 
+service_user *__nss_hosts_database attribute_hidden;
 
 /* This is the beginning of the real test code.  The above defines
    (among other things) the function rfc3484_sort.  */
diff --git a/posix/tst-rfc3484-3.c b/posix/tst-rfc3484-3.c
index ae44087a10..1c61aaf844 100644
--- a/posix/tst-rfc3484-3.c
+++ b/posix/tst-rfc3484-3.c
@@ -58,6 +58,7 @@ _res_hconf_init (void)
 #undef	USE_NSCD
 #include "../sysdeps/posix/getaddrinfo.c"
 
+service_user *__nss_hosts_database attribute_hidden;
 
 /* This is the beginning of the real test code.  The above defines
    (among other things) the function rfc3484_sort.  */
diff --git a/posix/tst-rfc3484.c b/posix/tst-rfc3484.c
index 7f191abbbc..8f45848e44 100644
--- a/posix/tst-rfc3484.c
+++ b/posix/tst-rfc3484.c
@@ -58,6 +58,7 @@ _res_hconf_init (void)
 #undef	USE_NSCD
 #include "../sysdeps/posix/getaddrinfo.c"
 
+service_user *__nss_hosts_database attribute_hidden;
 
 /* This is the beginning of the real test code.  The above defines
    (among other things) the function rfc3484_sort.  */

From 1e52d8e65a58c49a48549053a1b89c06240e0c6c Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri, 17 Nov 2017 16:04:29 -0200
Subject: [PATCH] i386: Fix i386 sigaction sa_restorer initialization
 (BZ#21269)

This patch fixes the i386 sa_restorer field initialization for sigaction
syscall for kernel with vDSO.  As described in bug report, i386 Linux
(and compat on x86_64) interprets SA_RESTORER clear with nonzero
sa_restorer as a request for stack switching if the SS segment is 'funny'.
This means that anything that tries to mix glibc's signal handling with
segmentation (for instance through modify_ldt syscall) is randomly broken
depending on what values lands in sa_restorer.

The testcase added  is based on Linux test tools/testing/selftests/x86/ldt_gdt.c,
more specifically in do_multicpu_tests function.  The main changes are:

  - C11 atomics instead of plain access.

  - Remove x86_64 support which simplifies the syscall handling and fallbacks.

  - Replicate only the test required to trigger the issue.

Checked on i686-linux-gnu.

	[BZ #21269]
	* sysdeps/unix/sysv/linux/i386/Makefile (tests): Add tst-bz21269.
	* sysdeps/unix/sysv/linux/i386/sigaction.c (SET_SA_RESTORER): Clear
	sa_restorer for vDSO case.
	* sysdeps/unix/sysv/linux/i386/tst-bz21269.c: New file.

(cherry picked from commit 68448be208ee06e76665918b37b0a57e3e00c8b4)

diff --git a/sysdeps/unix/sysv/linux/i386/Makefile b/sysdeps/unix/sysv/linux/i386/Makefile
index 4080b8c966..da716e2c1b 100644
--- a/sysdeps/unix/sysv/linux/i386/Makefile
+++ b/sysdeps/unix/sysv/linux/i386/Makefile
@@ -3,6 +3,9 @@ default-abi := 32
 
 ifeq ($(subdir),misc)
 sysdep_routines += ioperm iopl vm86
+
+tests += tst-bz21269
+$(objpfx)tst-bz21269: $(shared-thread-library)
 endif
 
 ifeq ($(subdir),elf)
diff --git a/sysdeps/unix/sysv/linux/i386/sigaction.c b/sysdeps/unix/sysv/linux/i386/sigaction.c
index a5eb9e0d3e..177ff60ee6 100644
--- a/sysdeps/unix/sysv/linux/i386/sigaction.c
+++ b/sysdeps/unix/sysv/linux/i386/sigaction.c
@@ -42,7 +42,6 @@ extern void restore_rt (void) asm ("__restore_rt") attribute_hidden;
 #endif
 extern void restore (void) asm ("__restore") attribute_hidden;
 
-
 /* If ACT is not NULL, change the action for SIG to *ACT.
    If OACT is not NULL, put the old action for SIG in *OACT.  */
 int
@@ -65,6 +64,8 @@ __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
 	  kact.sa_restorer = ((act->sa_flags & SA_SIGINFO)
 			      ? &restore_rt : &restore);
 	}
+      else
+	kact.sa_restorer = NULL;
     }
 
   /* XXX The size argument hopefully will have to be changed to the
diff --git a/sysdeps/unix/sysv/linux/i386/tst-bz21269.c b/sysdeps/unix/sysv/linux/i386/tst-bz21269.c
new file mode 100644
index 0000000000..353e36507d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/i386/tst-bz21269.c
@@ -0,0 +1,233 @@
+/* Test for i386 sigaction sa_restorer handling (BZ#21269)
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This is based on Linux test tools/testing/selftests/x86/ldt_gdt.c,
+   more specifically in do_multicpu_tests function.  The main changes
+   are:
+
+   - C11 atomics instead of plain access.
+   - Remove x86_64 support which simplifies the syscall handling
+     and fallbacks.
+   - Replicate only the test required to trigger the issue for the
+     BZ#21269.  */
+
+#include <stdatomic.h>
+
+#include <asm/ldt.h>
+#include <linux/futex.h>
+
+#include <setjmp.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/syscall.h>
+#include <sys/mman.h>
+
+#include <support/xunistd.h>
+#include <support/check.h>
+#include <support/xthread.h>
+
+static int
+xset_thread_area (struct user_desc *u_info)
+{
+  long ret = syscall (SYS_set_thread_area, u_info);
+  TEST_VERIFY_EXIT (ret == 0);
+  return ret;
+}
+
+static void
+xmodify_ldt (int func, const void *ptr, unsigned long bytecount)
+{
+  TEST_VERIFY_EXIT (syscall (SYS_modify_ldt, 1, ptr, bytecount) == 0);
+}
+
+static int
+futex (int *uaddr, int futex_op, int val, void *timeout, int *uaddr2,
+	int val3)
+{
+  return syscall (SYS_futex, uaddr, futex_op, val, timeout, uaddr2, val3);
+}
+
+static void
+xsethandler (int sig, void (*handler)(int, siginfo_t *, void *), int flags)
+{
+  struct sigaction sa = { 0 };
+  sa.sa_sigaction = handler;
+  sa.sa_flags = SA_SIGINFO | flags;
+  TEST_VERIFY_EXIT (sigemptyset (&sa.sa_mask) == 0);
+  TEST_VERIFY_EXIT (sigaction (sig, &sa, 0) == 0);
+}
+
+static jmp_buf jmpbuf;
+
+static void
+sigsegv_handler (int sig, siginfo_t *info, void *ctx_void)
+{
+  siglongjmp (jmpbuf, 1);
+}
+
+/* Points to an array of 1024 ints, each holding its own index.  */
+static const unsigned int *counter_page;
+static struct user_desc *low_user_desc;
+static struct user_desc *low_user_desc_clear; /* Used to delete GDT entry.  */
+static int gdt_entry_num;
+
+static void
+setup_counter_page (void)
+{
+  long page_size = sysconf (_SC_PAGE_SIZE);
+  TEST_VERIFY_EXIT (page_size > 0);
+  unsigned int *page = xmmap (NULL, page_size, PROT_READ | PROT_WRITE,
+			      MAP_ANONYMOUS | MAP_PRIVATE | MAP_32BIT, -1);
+  for (int i = 0; i < (page_size / sizeof (unsigned int)); i++)
+    page[i] = i;
+  counter_page = page;
+}
+
+static void
+setup_low_user_desc (void)
+{
+  low_user_desc = xmmap (NULL, 2 * sizeof (struct user_desc),
+			 PROT_READ | PROT_WRITE,
+			 MAP_ANONYMOUS | MAP_PRIVATE | MAP_32BIT, -1);
+
+  low_user_desc->entry_number    = -1;
+  low_user_desc->base_addr       = (unsigned long) &counter_page[1];
+  low_user_desc->limit           = 0xffff;
+  low_user_desc->seg_32bit       = 1;
+  low_user_desc->contents        = 0;
+  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;
+
+  xset_thread_area (low_user_desc);
+
+  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;
+}
+
+/* Possible values of futex:
+   0: thread is idle.
+   1: thread armed.
+   2: thread should clear LDT entry 0.
+   3: thread should exit.  */
+static atomic_uint ftx;
+
+static void *
+threadproc (void *ctx)
+{
+  while (1)
+    {
+      futex ((int *) &ftx, FUTEX_WAIT, 1, NULL, NULL, 0);
+      while (atomic_load (&ftx) != 2)
+	{
+	  if (atomic_load (&ftx) >= 3)
+	    return NULL;
+	}
+
+      /* clear LDT entry 0.  */
+      const struct user_desc desc = { 0 };
+      xmodify_ldt (1, &desc, sizeof (desc));
+
+      /* If ftx == 2, set it to zero,  If ftx == 100, quit.  */
+      if (atomic_fetch_add (&ftx, -2) != 2)
+	return NULL;
+    }
+}
+
+
+/* As described in testcase, for historical reasons x86_32 Linux (and compat
+   on x86_64) interprets SA_RESTORER clear with nonzero sa_restorer as a
+   request for stack switching if the SS segment is 'funny' (this is default
+   scenario for vDSO system).  This means that anything that tries to mix
+   signal handling with segmentation should explicit clear the sa_restorer.
+
+   This testcase check if sigaction in fact does it by changing the local
+   descriptor table (LDT) through the modify_ldt syscall and triggering
+   a synchronous segfault on iret fault by trying to install an invalid
+   segment.  With a correct zeroed sa_restorer it should not trigger an
+   'real' SEGSEGV and allows the siglongjmp in signal handler.  */
+
+static int
+do_test (void)
+{
+  setup_counter_page ();
+  setup_low_user_desc ();
+
+  pthread_t thread;
+  unsigned short orig_ss;
+
+  xsethandler (SIGSEGV, sigsegv_handler, 0);
+  /* 32-bit kernels send SIGILL instead of SIGSEGV on IRET faults.  */
+  xsethandler (SIGILL, sigsegv_handler, 0);
+
+  thread = xpthread_create (0, threadproc, 0);
+
+  asm volatile ("mov %%ss, %0" : "=rm" (orig_ss));
+
+  for (int i = 0; i < 5; i++)
+    {
+      if (sigsetjmp (jmpbuf, 1) != 0)
+	continue;
+
+      /* Make sure the thread is ready after the last test. */
+      while (atomic_load (&ftx) != 0)
+	;
+
+      struct user_desc desc = {
+	.entry_number       = 0,
+	.base_addr          = 0,
+	.limit              = 0xffff,
+	.seg_32bit          = 1,
+	.contents           = 0,
+	.read_exec_only     = 0,
+	.limit_in_pages     = 1,
+	.seg_not_present    = 0,
+	.useable            = 0
+      };
+
+      xmodify_ldt (0x11, &desc, sizeof (desc));
+
+      /* Arm the thread.  */
+      ftx = 1;
+      futex ((int*) &ftx, FUTEX_WAKE, 0, NULL, NULL, 0);
+
+      asm volatile ("mov %0, %%ss" : : "r" (0x7));
+
+      /* Fire up thread modify_ldt call.  */
+      atomic_store (&ftx, 2);
+
+      while (atomic_load (&ftx) != 0)
+	;
+
+      /* On success, modify_ldt will segfault us synchronously and we will
+	 escape via siglongjmp.  */
+      support_record_failure ();
+    }
+
+  atomic_store (&ftx, 100);
+  futex ((int*) &ftx, FUTEX_WAKE, 0, NULL, NULL, 0);
+
+  xpthread_join (thread);
+
+  return 0;
+}
+
+#include <support/test-driver.c>

From 55ad82e45c313454de657931898e974a7a036cad Mon Sep 17 00:00:00 2001
From: Andrew Senkevich <andrew.n.senkevich@gmail.com>
Date: Fri, 23 Mar 2018 16:19:45 +0100
Subject: [PATCH] Fix i386 memmove issue (bug 22644).

	[BZ #22644]
	* sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S: Fixed
	branch conditions.
	* string/test-memmove.c (do_test2): New testcase.

(cherry picked from commit cd66c0e584c6d692bc8347b5e72723d02b8a8ada)

diff --git a/string/test-memmove.c b/string/test-memmove.c
index edc7a4c3bf..64e3651ba4 100644
--- a/string/test-memmove.c
+++ b/string/test-memmove.c
@@ -24,6 +24,7 @@
 # define TEST_NAME "memmove"
 #endif
 #include "test-string.h"
+#include <support/test-driver.h>
 
 char *simple_memmove (char *, const char *, size_t);
 
@@ -245,6 +246,60 @@ do_random_tests (void)
     }
 }
 
+static void
+do_test2 (void)
+{
+  size_t size = 0x20000000;
+  uint32_t * large_buf;
+
+  large_buf = mmap ((void*) 0x70000000, size, PROT_READ | PROT_WRITE,
+		    MAP_PRIVATE | MAP_ANON, -1, 0);
+
+  if (large_buf == MAP_FAILED)
+    error (EXIT_UNSUPPORTED, errno, "Large mmap failed");
+
+  if ((uintptr_t) large_buf > 0x80000000 - 128
+      || 0x80000000 - (uintptr_t) large_buf > 0x20000000)
+    {
+      error (0, 0, "Large mmap allocated improperly");
+      ret = EXIT_UNSUPPORTED;
+      munmap ((void *) large_buf, size);
+      return;
+    }
+
+  size_t bytes_move = 0x80000000 - (uintptr_t) large_buf;
+  size_t arr_size = bytes_move / sizeof (uint32_t);
+  size_t i;
+
+  FOR_EACH_IMPL (impl, 0)
+    {
+      for (i = 0; i < arr_size; i++)
+        large_buf[i] = (uint32_t) i;
+
+      uint32_t * dst = &large_buf[33];
+
+#ifdef TEST_BCOPY
+      CALL (impl, (char *) large_buf, (char *) dst, bytes_move);
+#else
+      CALL (impl, (char *) dst, (char *) large_buf, bytes_move);
+#endif
+
+      for (i = 0; i < arr_size; i++)
+	{
+	  if (dst[i] != (uint32_t) i)
+	    {
+	      error (0, 0,
+		     "Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
+		     impl->name, dst, large_buf, i);
+	      ret = 1;
+	      break;
+	    }
+	}
+    }
+
+  munmap ((void *) large_buf, size);
+}
+
 int
 test_main (void)
 {
@@ -284,6 +339,9 @@ test_main (void)
     }
 
   do_random_tests ();
+
+  do_test2 ();
+
   return ret;
 }
 
diff --git a/sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S b/sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S
index 9c3bbe7e17..9aa17de99c 100644
--- a/sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S
+++ b/sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S
@@ -72,7 +72,7 @@ ENTRY (MEMCPY)
 	cmp	%edx, %eax
 
 # ifdef USE_AS_MEMMOVE
-	jg	L(check_forward)
+	ja	L(check_forward)
 
 L(mm_len_0_or_more_backward):
 /* Now do checks for lengths. We do [0..16], [16..32], [32..64], [64..128]
@@ -81,7 +81,7 @@ L(mm_len_0_or_more_backward):
 	jbe	L(mm_len_0_16_bytes_backward)
 
 	cmpl	$32, %ecx
-	jg	L(mm_len_32_or_more_backward)
+	ja	L(mm_len_32_or_more_backward)
 
 /* Copy [0..32] and return.  */
 	movdqu	(%eax), %xmm0
@@ -92,7 +92,7 @@ L(mm_len_0_or_more_backward):
 
 L(mm_len_32_or_more_backward):
 	cmpl	$64, %ecx
-	jg	L(mm_len_64_or_more_backward)
+	ja	L(mm_len_64_or_more_backward)
 
 /* Copy [0..64] and return.  */
 	movdqu	(%eax), %xmm0
@@ -107,7 +107,7 @@ L(mm_len_32_or_more_backward):
 
 L(mm_len_64_or_more_backward):
 	cmpl	$128, %ecx
-	jg	L(mm_len_128_or_more_backward)
+	ja	L(mm_len_128_or_more_backward)
 
 /* Copy [0..128] and return.  */
 	movdqu	(%eax), %xmm0
@@ -132,7 +132,7 @@ L(mm_len_128_or_more_backward):
 	add	%ecx, %eax
 	cmp	%edx, %eax
 	movl	SRC(%esp), %eax
-	jle	L(forward)
+	jbe	L(forward)
 	PUSH (%esi)
 	PUSH (%edi)
 	PUSH (%ebx)
@@ -269,7 +269,7 @@ L(check_forward):
 	add	%edx, %ecx
 	cmp	%eax, %ecx
 	movl	LEN(%esp), %ecx
-	jle	L(forward)
+	jbe	L(forward)
 
 /* Now do checks for lengths. We do [0..16], [0..32], [0..64], [0..128]
 	separately.  */