glibc: Secruity fix for CVE-2020-6096

Source: glibc.org
MR: 104799
Type: Security Fix
Disposition: Backport from  beea361050728138b82c57dda0c4810402d342b9
ChangeID: 29df826fb697fdd2742c3bace33388bda962c5f1
Description:

(From OE-Core rev: 7ce425fa1295a9dca48f8474be58db3ac8aa540d)

Signed-off-by: Armin Kuster <akuster@gmvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit ffa4fa35e1f6132b19788166a2b87517d9e17d95)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 112 insertions, 0 deletions

diff --git a/meta/recipes-core/glibc/glibc/CVE-2020-6096.patch b/meta/recipes-core/glibc/glibc/CVE-2020-6096.patch
new file mode 100644
index 0000000000..9c26f76432
--- /dev/null
+++ b/meta/recipes-core/glibc/glibc/CVE-2020-6096.patch
@@ -0,0 +1,112 @@
+From beea361050728138b82c57dda0c4810402d342b9 Mon Sep 17 00:00:00 2001
+From: Alexander Anisimov <a.anisimov@omprussia.ru>
+Date: Wed, 8 Jul 2020 14:18:31 +0200
+Subject: [PATCH] arm: CVE-2020-6096: Fix multiarch memcpy for negative length
+ [BZ #25620]
+
+Unsigned branch instructions could be used for r2 to fix the wrong
+behavior when a negative length is passed to memcpy.
+This commit fixes the armv7 version.
+
+Upstream-Status: Backport
+CVE: CVE-2020-6096 patch #1
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ sysdeps/arm/armv7/multiarch/memcpy_impl.S | 22 +++++++++++-----------
+ 1 file changed, 11 insertions(+), 11 deletions(-)
+
+diff --git a/sysdeps/arm/armv7/multiarch/memcpy_impl.S b/sysdeps/arm/armv7/multiarch/memcpy_impl.S
+index bf4ac7077f..379bb56fc9 100644
+--- a/sysdeps/arm/armv7/multiarch/memcpy_impl.S
++++ b/sysdeps/arm/armv7/multiarch/memcpy_impl.S
+@@ -268,7 +268,7 @@ ENTRY(memcpy)
+ 
+        mov     dst, dstin      /* Preserve dstin, we need to return it.  */
+        cmp     count, #64
+-       bge     .Lcpy_not_short
++       bhs     .Lcpy_not_short
+        /* Deal with small copies quickly by dropping straight into the
+           exit block.  */
+ 
+@@ -351,10 +351,10 @@ ENTRY(memcpy)
+ 
+ 1:
+        subs    tmp2, count, #64        /* Use tmp2 for count.  */
+-       blt     .Ltail63aligned
++       blo     .Ltail63aligned
+ 
+        cmp     tmp2, #512
+-       bge     .Lcpy_body_long
++       bhs     .Lcpy_body_long
+ 
+ .Lcpy_body_medium:                     /* Count in tmp2.  */
+ #ifdef USE_VFP
+@@ -378,7 +378,7 @@ ENTRY(memcpy)
+        add     src, src, #64
+        vstr    d1, [dst, #56]
+        add     dst, dst, #64
+-       bge     1b
++       bhs     1b
+        tst     tmp2, #0x3f
+        beq     .Ldone
+ 
+@@ -412,7 +412,7 @@ ENTRY(memcpy)
+        ldrd    A_l, A_h, [src, #64]!
+        strd    A_l, A_h, [dst, #64]!
+        subs    tmp2, tmp2, #64
+-       bge     1b
++       bhs     1b
+        tst     tmp2, #0x3f
+        bne     1f
+        ldr     tmp2,[sp], #FRAME_SIZE
+@@ -482,7 +482,7 @@ ENTRY(memcpy)
+        add     src, src, #32
+ 
+        subs    tmp2, tmp2, #prefetch_lines * 64 * 2
+-       blt     2f
++       blo     2f
+ 1:
+        cpy_line_vfp    d3, 0
+        cpy_line_vfp    d4, 64
+@@ -494,7 +494,7 @@ ENTRY(memcpy)
+        add     dst, dst, #2 * 64
+        add     src, src, #2 * 64
+        subs    tmp2, tmp2, #prefetch_lines * 64
+-       bge     1b
++       bhs     1b
+ 
+ 2:
+        cpy_tail_vfp    d3, 0
+@@ -615,8 +615,8 @@ ENTRY(memcpy)
+ 1:
+        pld     [src, #(3 * 64)]
+        subs    count, count, #64
+-       ldrmi   tmp2, [sp], #FRAME_SIZE
+-       bmi     .Ltail63unaligned
++       ldrlo   tmp2, [sp], #FRAME_SIZE
++       blo     .Ltail63unaligned
+        pld     [src, #(4 * 64)]
+ 
+ #ifdef USE_NEON
+@@ -633,7 +633,7 @@ ENTRY(memcpy)
+        neon_load_multi d0-d3, src
+        neon_load_multi d4-d7, src
+        subs    count, count, #64
+-       bmi     2f
++       blo     2f
+ 1:
+        pld     [src, #(4 * 64)]
+        neon_store_multi d0-d3, dst
+@@ -641,7 +641,7 @@ ENTRY(memcpy)
+        neon_store_multi d4-d7, dst
+        neon_load_multi d4-d7, src
+        subs    count, count, #64
+-       bpl     1b
++       bhs     1b
+ 2:
+        neon_store_multi d0-d3, dst
+        neon_store_multi d4-d7, dst
+-- 
+2.17.1
+