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From: <gregkh@linuxfoundation.org>
To: schwidefsky@de.ibm.com, brueckner@linux.vnet.ibm.com
Cc: <stable@vger.kernel.org>
Subject: FAILED: patch "[PATCH] s390/crc32-vx: use expoline for indirect branches" failed to apply to 4.4-stable tree
Date: Sun, 20 May 2018 10:26:13 +0200	[thread overview]
Message-ID: <1526804773170160@kroah.com> (raw)


The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 467a3bf219cee12259182c5cb4821f88fd518a51 Mon Sep 17 00:00:00 2001
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Mon, 23 Apr 2018 14:31:36 +0200
Subject: [PATCH] s390/crc32-vx: use expoline for indirect branches

The return from the crc32_le_vgfm_16/crc32c_le_vgfm_16 and the
crc32_be_vgfm_16 functions are done with "br %r14". These are indirect
branches as well and need to use execute trampolines for CONFIG_EXPOLINE=y.

Cc: stable@vger.kernel.org # 4.16
Fixes: f19fbd5ed6 ("s390: introduce execute-trampolines for branches")
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/crypto/crc32be-vx.S b/arch/s390/crypto/crc32be-vx.S
index e8077f0971f8..2bf01ba44107 100644
--- a/arch/s390/crypto/crc32be-vx.S
+++ b/arch/s390/crypto/crc32be-vx.S
@@ -13,6 +13,7 @@
  */
 
 #include <linux/linkage.h>
+#include <asm/nospec-insn.h>
 #include <asm/vx-insn.h>
 
 /* Vector register range containing CRC-32 constants */
@@ -67,6 +68,8 @@
 
 .previous
 
+	GEN_BR_THUNK %r14
+
 .text
 /*
  * The CRC-32 function(s) use these calling conventions:
@@ -203,6 +206,6 @@ ENTRY(crc32_be_vgfm_16)
 
 .Ldone:
 	VLGVF	%r2,%v2,3
-	br	%r14
+	BR_EX	%r14
 
 .previous
diff --git a/arch/s390/crypto/crc32le-vx.S b/arch/s390/crypto/crc32le-vx.S
index d8c67a58c0c5..7d6f568bd3ad 100644
--- a/arch/s390/crypto/crc32le-vx.S
+++ b/arch/s390/crypto/crc32le-vx.S
@@ -14,6 +14,7 @@
  */
 
 #include <linux/linkage.h>
+#include <asm/nospec-insn.h>
 #include <asm/vx-insn.h>
 
 /* Vector register range containing CRC-32 constants */
@@ -76,6 +77,7 @@
 
 .previous
 
+	GEN_BR_THUNK %r14
 
 .text
 
@@ -264,6 +266,6 @@ crc32_le_vgfm_generic:
 
 .Ldone:
 	VLGVF	%r2,%v2,2
-	br	%r14
+	BR_EX	%r14
 
 .previous

                 reply	other threads:[~2018-05-20  8:26 UTC|newest]

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