This is a note to let you know that I've just added the patch titled
sparc64: fix fault handling in NGbzero.S and GENbzero.S
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sparc64-fix-fault-handling-in-ngbzero.s-and-genbzero.s.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3c7f62212018b904ae17f5636ead18a4dca3a88f Mon Sep 17 00:00:00 2001
From: Dave Aldridge <david.j.aldridge@xxxxxxxxxx>
Date: Tue, 9 May 2017 02:57:35 -0600
Subject: sparc64: fix fault handling in NGbzero.S and GENbzero.S
From: Dave Aldridge <david.j.aldridge@xxxxxxxxxx>
commit 3c7f62212018b904ae17f5636ead18a4dca3a88f upstream.
When any of the functions contained in NGbzero.S and GENbzero.S
vector through *bzero_from_clear_user, we may end up taking a
fault when executing one of the store alternate address space
instructions. If this happens, the exception handler does not
restore the %asi register.
This commit fixes the issue by introducing a new exception
handler that ensures the %asi register is restored when
a fault is handled.
Orabug: 25577560
Signed-off-by: Dave Aldridge <david.j.aldridge@xxxxxxxxxx>
Reviewed-by: Rob Gardner <rob.gardner@xxxxxxxxxx>
Reviewed-by: Babu Moger <babu.moger@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/sparc/kernel/head_64.S | 6 ++++++
arch/sparc/lib/GENbzero.S | 2 +-
arch/sparc/lib/NGbzero.S | 2 +-
3 files changed, 8 insertions(+), 2 deletions(-)
--- a/arch/sparc/kernel/head_64.S
+++ b/arch/sparc/kernel/head_64.S
@@ -935,3 +935,9 @@ ENTRY(__retl_o1)
retl
mov %o1, %o0
ENDPROC(__retl_o1)
+
+ENTRY(__retl_o1_asi)
+ wr %o5, 0x0, %asi
+ retl
+ mov %o1, %o0
+ENDPROC(__retl_o1_asi)
--- a/arch/sparc/lib/GENbzero.S
+++ b/arch/sparc/lib/GENbzero.S
@@ -8,7 +8,7 @@
98: x,y; \
.section __ex_table,"a";\
.align 4; \
- .word 98b, __retl_o1; \
+ .word 98b, __retl_o1_asi;\
.text; \
.align 4;
--- a/arch/sparc/lib/NGbzero.S
+++ b/arch/sparc/lib/NGbzero.S
@@ -8,7 +8,7 @@
98: x,y; \
.section __ex_table,"a";\
.align 4; \
- .word 98b, __retl_o1; \
+ .word 98b, __retl_o1_asi;\
.text; \
.align 4;
Patches currently in stable-queue which might be from david.j.aldridge@xxxxxxxxxx are
queue-4.9/sparc64-fix-fault-handling-in-ngbzero.s-and-genbzero.s.patch