218 строки
5.7 KiB
Diff
218 строки
5.7 KiB
Diff
diff --git a/./ChangeLog b/ChangeLog
|
||
index 08b42bd..0e82190 100644
|
||
--- a/ChangeLog
|
||
+++ b/ChangeLog
|
||
@@ -1,3 +1,14 @@
|
||
+2019-02-04 H.J. Lu <hongjiu.lu@intel.com>
|
||
+
|
||
+ [BZ #24155]
|
||
+ CVE-2019-7309
|
||
+ * NEWS: Updated for CVE-2019-7309.
|
||
+ * sysdeps/x86_64/memcmp.S: Use RDX_LP for size. Clear the
|
||
+ upper 32 bits of RDX register for x32. Use unsigned Jcc
|
||
+ instructions, instead of signed.
|
||
+ * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memcmp-2.
|
||
+ * sysdeps/x86_64/x32/tst-size_t-memcmp-2.c: New test.
|
||
+
|
||
2018-08-01 Carlos O'Donel <carlos@redhat.com>
|
||
|
||
* version.h (RELEASE): Set to "stable".
|
||
diff --git a/NEWS b/NEWS
|
||
index 154ab22..d254097 100644
|
||
--- a/NEWS
|
||
+++ b/NEWS
|
||
@@ -240,6 +240,14 @@ Security related changes:
|
||
architecture could write beyond the target buffer, resulting in a buffer
|
||
overflow. Reported by Andreas Schwab.
|
||
|
||
+ CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
|
||
+ size. For x86-64, memcmp on an object size larger than SSIZE_MAX
|
||
+ has undefined behavior. On x32, the size_t argument may be passed
|
||
+ in the lower 32 bits of the 64-bit RDX register with non-zero upper
|
||
+ 32 bits. When it happened with the sign bit of RDX register set,
|
||
+ memcmp gave the wrong result since it treated the size argument as
|
||
+ zero. Reported by H.J. Lu.
|
||
+
|
||
The following bugs are resolved with this release:
|
||
|
||
[1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
|
||
@@ -422,6 +430,7 @@ The following bugs are resolved with this release:
|
||
[23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
|
||
processors
|
||
[23467] dynamic-link: x86/CET: A property note parser bug
|
||
+ [24155] x32 memcmp can treat positive length as 0 (if sign bit in RDX is set) (CVE-2019-7309)
|
||
|
||
|
||
Version 2.27
|
||
|
||
diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
|
||
index bcb4a2e88d..45918d375a 100644
|
||
--- a/sysdeps/x86_64/memcmp.S
|
||
+++ b/sysdeps/x86_64/memcmp.S
|
||
@@ -21,14 +21,18 @@
|
||
|
||
.text
|
||
ENTRY (memcmp)
|
||
- test %rdx, %rdx
|
||
+#ifdef __ILP32__
|
||
+ /* Clear the upper 32 bits. */
|
||
+ movl %edx, %edx
|
||
+#endif
|
||
+ test %RDX_LP, %RDX_LP
|
||
jz L(finz)
|
||
cmpq $1, %rdx
|
||
- jle L(finr1b)
|
||
+ jbe L(finr1b)
|
||
subq %rdi, %rsi
|
||
movq %rdx, %r10
|
||
cmpq $32, %r10
|
||
- jge L(gt32)
|
||
+ jae L(gt32)
|
||
/* Handle small chunks and last block of less than 32 bytes. */
|
||
L(small):
|
||
testq $1, %r10
|
||
@@ -156,7 +160,7 @@ L(A32):
|
||
movq %r11, %r10
|
||
andq $-32, %r10
|
||
cmpq %r10, %rdi
|
||
- jge L(mt16)
|
||
+ jae L(mt16)
|
||
/* Pre-unroll to be ready for unrolled 64B loop. */
|
||
testq $32, %rdi
|
||
jz L(A64)
|
||
@@ -178,7 +182,7 @@ L(A64):
|
||
movq %r11, %r10
|
||
andq $-64, %r10
|
||
cmpq %r10, %rdi
|
||
- jge L(mt32)
|
||
+ jae L(mt32)
|
||
|
||
L(A64main):
|
||
movdqu (%rdi,%rsi), %xmm0
|
||
@@ -216,7 +220,7 @@ L(mt32):
|
||
movq %r11, %r10
|
||
andq $-32, %r10
|
||
cmpq %r10, %rdi
|
||
- jge L(mt16)
|
||
+ jae L(mt16)
|
||
|
||
L(A32main):
|
||
movdqu (%rdi,%rsi), %xmm0
|
||
@@ -254,7 +258,7 @@ L(ATR):
|
||
movq %r11, %r10
|
||
andq $-32, %r10
|
||
cmpq %r10, %rdi
|
||
- jge L(mt16)
|
||
+ jae L(mt16)
|
||
testq $16, %rdi
|
||
jz L(ATR32)
|
||
|
||
@@ -325,7 +329,7 @@ L(ATR64main):
|
||
movq %r11, %r10
|
||
andq $-32, %r10
|
||
cmpq %r10, %rdi
|
||
- jge L(mt16)
|
||
+ jae L(mt16)
|
||
|
||
L(ATR32res):
|
||
movdqa (%rdi,%rsi), %xmm0
|
||
diff --git a/sysdeps/x86_64/x32/Makefile b/sysdeps/x86_64/x32/Makefile
|
||
index f2ebc24..457c707 100644
|
||
--- a/sysdeps/x86_64/x32/Makefile
|
||
+++ b/sysdeps/x86_64/x32/Makefile
|
||
@@ -4,3 +4,7 @@ ifeq ($(subdir),math)
|
||
# 64-bit llround. Add -fno-builtin-lround to silence the compiler.
|
||
CFLAGS-s_llround.c += -fno-builtin-lround
|
||
endif
|
||
+
|
||
+ifeq ($(subdir),string)
|
||
+ tests += tst-size_t-memcmp-2
|
||
+endif
|
||
\ No newline at end of file
|
||
diff --git a/sysdeps/x86_64/x32/tst-size_t-memcmp-2.c b/sysdeps/x86_64/x32/tst-size_t-memcmp-2.c
|
||
new file mode 100644
|
||
index 0000000000..d8ae1a0813
|
||
--- /dev/null
|
||
+++ b/sysdeps/x86_64/x32/tst-size_t-memcmp-2.c
|
||
@@ -0,0 +1,79 @@
|
||
+/* Test memcmp 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_MAIN
|
||
+#ifdef WIDE
|
||
+# define TEST_NAME "wmemcmp"
|
||
+#else
|
||
+# define TEST_NAME "memcmp"
|
||
+#endif
|
||
+
|
||
+#include "test-size_t.h"
|
||
+
|
||
+#ifdef WIDE
|
||
+# include <inttypes.h>
|
||
+# include <wchar.h>
|
||
+
|
||
+# define MEMCMP wmemcmp
|
||
+# define CHAR wchar_t
|
||
+#else
|
||
+# define MEMCMP memcmp
|
||
+# define CHAR char
|
||
+#endif
|
||
+
|
||
+IMPL (MEMCMP, 1)
|
||
+
|
||
+typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
|
||
+
|
||
+static int
|
||
+__attribute__ ((noinline, noclone))
|
||
+do_memcmp (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 / sizeof (CHAR) }, buf1 };
|
||
+ parameter_t src = { { 0 }, buf2 };
|
||
+
|
||
+ memcpy (buf1, buf2, page_size);
|
||
+
|
||
+ CHAR *p = (CHAR *) buf1;
|
||
+ p[page_size / sizeof (CHAR) - 1] = (CHAR) 1;
|
||
+
|
||
+ int ret = 0;
|
||
+ FOR_EACH_IMPL (impl, 0)
|
||
+ {
|
||
+ src.fn = impl->fn;
|
||
+ int res = do_memcmp (dest, src);
|
||
+ if (res >= 0)
|
||
+ {
|
||
+ 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>
|
||
--
|