glibc: fix CVE-2018-11237

glibc: fix CVE-2018-11237

(From OE-Core rev: b9b254da08c1db94ac9ded5f67d7e2e82e3b9be7)

Signed-off-by: Zheng Ruoqin <zhengrq.fnst@cn.fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 83 insertions, 0 deletions

diff --git a/meta/recipes-core/glibc/glibc/CVE-2018-11237.patch b/meta/recipes-core/glibc/glibc/CVE-2018-11237.patch
new file mode 100644
index 0000000000..632aa565e4
--- /dev/null
+++ b/meta/recipes-core/glibc/glibc/CVE-2018-11237.patch
@@ -0,0 +1,82 @@
+From 9aaaab7c6e4176e61c59b0a63c6ba906d875dc0e Mon Sep 17 00:00:00 2001
+From: Andreas Schwab <schwab@suse.de>
+Date: Tue, 22 May 2018 10:37:59 +0200
+Subject: [PATCH] Don't write beyond destination in
+ __mempcpy_avx512_no_vzeroupper (bug 23196)
+
+When compiled as mempcpy, the return value is the end of the destination
+buffer, thus it cannot be used to refer to the start of it.
+
+2018-05-23  Andreas Schwab  <schwab@suse.de>
+
+       [BZ #23196]
+       CVE-2018-11237
+       * sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
+       (L(preloop_large)): Save initial destination pointer in %r11 and
+       use it instead of %rax after the loop.
+       * string/test-mempcpy.c (MIN_PAGE_SIZE): Define.
+
+CVE: CVE-2018-11237
+Upstream-Status: Backport
+Signed-off-by: Zheng Ruoqin <zhengrq.fnst@cn.fujitsu.com>
+---
+ ChangeLog                                               | 9 +++++++++
+ string/test-mempcpy.c                                   | 1 +
+ sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S | 5 +++--
+ 3 files changed, 13 insertions(+), 2 deletions(-)
+
+diff --git a/ChangeLog b/ChangeLog
+index fa0a07c..bc09dec 100644
+--- a/ChangeLog
++++ b/ChangeLog
+@@ -1,3 +1,12 @@
++2018-05-23  Andreas Schwab  <schwab@suse.de>
++
++       [BZ #23196]
++       CVE-2018-11237
++       * sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
++       (L(preloop_large)): Save initial destination pointer in %r11 and
++       use it instead of %rax after the loop.
++       * string/test-mempcpy.c (MIN_PAGE_SIZE): Define.
++
+ 2018-05-09  Paul Pluzhnikov  <ppluzhnikov@google.com>
+ 
+        [BZ #22786]
+diff --git a/string/test-mempcpy.c b/string/test-mempcpy.c
+index c08fba8..d98ecdd 100644
+--- a/string/test-mempcpy.c
++++ b/string/test-mempcpy.c
+@@ -18,6 +18,7 @@
+    <http://www.gnu.org/licenses/>.  */
+ 
+ #define MEMCPY_RESULT(dst, len) (dst) + (len)
++#define MIN_PAGE_SIZE 131072
+ #define TEST_MAIN
+ #define TEST_NAME "mempcpy"
+ #include "test-string.h"
+diff --git a/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S b/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
+index 23c0f7a..a55cf6f 100644
+--- a/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
++++ b/sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S
+@@ -335,6 +335,7 @@ L(preloop_large):
+        ja      L(preloop_large_bkw)
+        vmovups (%rsi), %zmm4
+        vmovups 0x40(%rsi), %zmm5
++       mov     %rdi, %r11
+ 
+ /* Align destination for access with non-temporal stores in the loop.  */
+        mov     %rdi, %r8
+@@ -366,8 +367,8 @@ L(gobble_256bytes_nt_loop):
+        cmp     $256, %rdx
+        ja      L(gobble_256bytes_nt_loop)
+        sfence
+-       vmovups %zmm4, (%rax)
+-       vmovups %zmm5, 0x40(%rax)
++       vmovups %zmm4, (%r11)
++       vmovups %zmm5, 0x40(%r11)
+        jmp     L(check)
+ 
+ L(preloop_large_bkw):
+-- 
+2.7.4
+
diff --git a/meta/recipes-core/glibc/glibc_2.27.bb b/meta/recipes-core/glibc/glibc_2.27.bb
index fe23eb6653..b14c02cf2a 100644
--- a/meta/recipes-core/glibc/glibc_2.27.bb
+++ b/meta/recipes-core/glibc/glibc_2.27.bb
@@ -46,6 +46,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \
            file://0030-plural_c_no_preprocessor_lines.patch \
            file://CVE-2017-18269.patch \
            file://CVE-2018-11236.patch \
+           file://CVE-2018-11237.patch \
 "
 
 NATIVESDKFIXES ?= ""