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glibc/SOURCES/glibc-RHEL-15696-6.patch

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From ee915088a0231cd421054dbd8abab7aadf331153 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Mon, 21 Jan 2019 11:33:52 -0800
Subject: [PATCH] x86-64 strncmp family: Properly handle the length parameter
[BZ# 24097]
Content-type: text/plain; charset=UTF-8
On x32, the size_t parameter may be passed in the lower 32 bits of a
64-bit register with the non-zero upper 32 bits. The string/memory
functions written in assembly can only use the lower 32 bits of a
64-bit register as length or must clear the upper 32 bits before using
the full 64-bit register for length.
This pach fixes the strncmp family for x32. Tested on x86-64 and x32.
On x86-64, libc.so is the same with and withou the fix.
[BZ# 24097]
CVE-2019-6488
* sysdeps/x86_64/multiarch/strcmp-avx2.S: Use RDX_LP for length.
* sysdeps/x86_64/multiarch/strcmp-sse42.S: Likewise.
* sysdeps/x86_64/strcmp.S: Likewise.
* sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-strncasecmp,
tst-size_t-strncmp and tst-size_t-wcsncmp.
* sysdeps/x86_64/x32/tst-size_t-strncasecmp.c: New file.
* sysdeps/x86_64/x32/tst-size_t-strncmp.c: Likewise.
* sysdeps/x86_64/x32/tst-size_t-wcsncmp.c: Likewise.
---
sysdeps/x86_64/multiarch/strcmp-avx2.S | 6 +-
sysdeps/x86_64/multiarch/strcmp-sse42.S | 6 +-
sysdeps/x86_64/strcmp.S | 6 +-
sysdeps/x86_64/x32/Makefile | 6 +-
sysdeps/x86_64/x32/tst-size_t-strncasecmp.c | 59 ++++++++++++++++
sysdeps/x86_64/x32/tst-size_t-strncmp.c | 78 +++++++++++++++++++++
sysdeps/x86_64/x32/tst-size_t-wcsncmp.c | 20 ++++++
7 files changed, 170 insertions(+), 11 deletions(-)
create mode 100644 sysdeps/x86_64/x32/tst-size_t-strncasecmp.c
create mode 100644 sysdeps/x86_64/x32/tst-size_t-strncmp.c
create mode 100644 sysdeps/x86_64/x32/tst-size_t-wcsncmp.c
Conflicts:
ChangeLog
(removed)
diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
index 327e3d87..156c1949 100644
--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
@@ -79,15 +79,15 @@
ENTRY (STRCMP)
# ifdef USE_AS_STRNCMP
/* Check for simple cases (0 or 1) in offset. */
- cmp $1, %rdx
+ cmp $1, %RDX_LP
je L(char0)
jb L(zero)
# ifdef USE_AS_WCSCMP
/* Convert units: from wide to byte char. */
- shl $2, %rdx
+ shl $2, %RDX_LP
# endif
/* Register %r11 tracks the maximum offset. */
- movq %rdx, %r11
+ mov %RDX_LP, %R11_LP
# endif
movl %edi, %eax
xorl %edx, %edx
diff --git a/sysdeps/x86_64/multiarch/strcmp-sse42.S b/sysdeps/x86_64/multiarch/strcmp-sse42.S
index d3c07bd2..a1ebea46 100644
--- a/sysdeps/x86_64/multiarch/strcmp-sse42.S
+++ b/sysdeps/x86_64/multiarch/strcmp-sse42.S
@@ -156,11 +156,11 @@ STRCMP_SSE42:
#endif
#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
- test %rdx, %rdx
+ test %RDX_LP, %RDX_LP
je LABEL(strcmp_exitz)
- cmp $1, %rdx
+ cmp $1, %RDX_LP
je LABEL(Byte0)
- mov %rdx, %r11
+ mov %RDX_LP, %R11_LP
#endif
mov %esi, %ecx
mov %edi, %eax
diff --git a/sysdeps/x86_64/strcmp.S b/sysdeps/x86_64/strcmp.S
index e16945b9..f47c8ad4 100644
--- a/sysdeps/x86_64/strcmp.S
+++ b/sysdeps/x86_64/strcmp.S
@@ -135,11 +135,11 @@ ENTRY (STRCMP)
* This implementation uses SSE to compare up to 16 bytes at a time.
*/
#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
- test %rdx, %rdx
+ test %RDX_LP, %RDX_LP
je LABEL(strcmp_exitz)
- cmp $1, %rdx
+ cmp $1, %RDX_LP
je LABEL(Byte0)
- mov %rdx, %r11
+ mov %RDX_LP, %R11_LP
#endif
mov %esi, %ecx
mov %edi, %eax
diff --git a/sysdeps/x86_64/x32/Makefile b/sysdeps/x86_64/x32/Makefile
index 98bd9ae9..db302839 100644
--- a/sysdeps/x86_64/x32/Makefile
+++ b/sysdeps/x86_64/x32/Makefile
@@ -7,9 +7,11 @@ endif
ifeq ($(subdir),string)
tests += tst-size_t-memchr tst-size_t-memcmp tst-size_t-memcpy \
- tst-size_t-memrchr tst-size_t-memset
+ tst-size_t-memrchr tst-size_t-memset tst-size_t-strncasecmp \
+ tst-size_t-strncmp
endif
ifeq ($(subdir),wcsmbs)
-tests += tst-size_t-wmemchr tst-size_t-wmemcmp tst-size_t-wmemset
+tests += tst-size_t-wmemchr tst-size_t-wmemcmp tst-size_t-wmemset \
+ tst-size_t-wcsncmp
endif
diff --git a/sysdeps/x86_64/x32/tst-size_t-strncasecmp.c b/sysdeps/x86_64/x32/tst-size_t-strncasecmp.c
new file mode 100644
index 00000000..86233593
--- /dev/null
+++ b/sysdeps/x86_64/x32/tst-size_t-strncasecmp.c
@@ -0,0 +1,59 @@
+/* Test strncaecmp with size_t in the lower 32 bits of 64-bit register.
+ Copyright (C) 2019 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/>. */
+
+#define TEST_NAME "strncasecmp"
+#include "test-size_t.h"
+
+IMPL (strncasecmp, 1)
+
+typedef int (*proto_t) (const char *, const char *, size_t);
+
+static int
+__attribute__ ((noinline, noclone))
+do_strncasecmp (parameter_t a, parameter_t b)
+{
+ return CALL (&b, a.p, b.p, a.len);
+}
+
+static int
+test_main (void)
+{
+ test_init ();
+
+ parameter_t dest = { { page_size }, buf1 };
+ parameter_t src = { { 0 }, buf2 };
+
+ strncpy ((char *) buf1, (const char *) buf2, page_size);
+
+ int ret = 0;
+ FOR_EACH_IMPL (impl, 0)
+ {
+ src.fn = impl->fn;
+ int res = do_strncasecmp (dest, src);
+ if (res)
+ {
+ error (0, 0, "Wrong result in function %s: %i != 0",
+ impl->name, res);
+ ret = 1;
+ }
+ }
+
+ return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/x86_64/x32/tst-size_t-strncmp.c b/sysdeps/x86_64/x32/tst-size_t-strncmp.c
new file mode 100644
index 00000000..54e6bd83
--- /dev/null
+++ b/sysdeps/x86_64/x32/tst-size_t-strncmp.c
@@ -0,0 +1,78 @@
+/* Test strncmp with size_t in the lower 32 bits of 64-bit register.
+ Copyright (C) 2019 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/>. */
+
+#ifdef WIDE
+# define TEST_NAME "wcsncmp"
+#else
+# define TEST_NAME "strncmp"
+#endif
+
+#include "test-size_t.h"
+
+#ifdef WIDE
+# include <wchar.h>
+
+# define STRNCMP wcsncmp
+# define STRNCPY wcsncpy
+# define CHAR wchar_t
+#else
+# define STRNCMP strncmp
+# define STRNCPY strncpy
+# define CHAR char
+#endif
+
+IMPL (STRNCMP, 1)
+
+typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
+
+
+static int
+__attribute__ ((noinline, noclone))
+do_strncmp (parameter_t a, parameter_t b)
+{
+ return CALL (&b, a.p, b.p, a.len);
+}
+
+static int
+test_main (void)
+{
+ test_init ();
+
+ size_t size = page_size / sizeof (CHAR);
+ parameter_t dest = { { size }, buf1 };
+ parameter_t src = { { 0 }, buf2 };
+
+ STRNCPY ((CHAR *) buf1, (const CHAR *) buf2, size);
+
+ int ret = 0;
+ FOR_EACH_IMPL (impl, 0)
+ {
+ src.fn = impl->fn;
+ int res = do_strncmp (dest, src);
+ if (res)
+ {
+ error (0, 0, "Wrong result in function %s: %i != 0",
+ impl->name, res);
+ ret = 1;
+ }
+ }
+
+ return ret ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/x86_64/x32/tst-size_t-wcsncmp.c b/sysdeps/x86_64/x32/tst-size_t-wcsncmp.c
new file mode 100644
index 00000000..4829647c
--- /dev/null
+++ b/sysdeps/x86_64/x32/tst-size_t-wcsncmp.c
@@ -0,0 +1,20 @@
+/* Test wcsncmp with size_t in the lower 32 bits of 64-bit register.
+ Copyright (C) 2019 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/>. */
+
+#define WIDE 1
+#include "tst-size_t-strncmp.c"
--
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