[PATCH 3.16 161/366] MIPS: memset.S: EVA & fault support for small_memset

Ben Hutchings
2018-10-14T23:11:43Z

From: Matt Redfearn <matt.redfearn@mips.com>

commit 8a8158c85e1e774a44fbe81106fa41138580dfd1 upstream.

The MIPS kernel memset / bzero implementation includes a small_memset
branch which is used when the region to be set is smaller than a long (4
bytes on 32bit, 8 bytes on 64bit). The current small_memset
implementation uses a simple store byte loop to write the destination.
There are 2 issues with this implementation:

1. When EVA mode is active, user and kernel address spaces may overlap.
Currently the use of the sb instruction means kernel mode addressing is
always used and an intended write to userspace may actually overwrite
some critical kernel data.

2. If the write triggers a page fault, for example by calling
__clear_user(NULL, 2), instead of gracefully handling the fault, an OOPS
is triggered.

Fix these issues by replacing the sb instruction with the EX() macro,
which will emit EVA compatible instuctions as required. Additionally
implement a fault fixup for small_memset which sets a2 to the number of
bytes that could not be cleared (as defined by __clear_user).

Reported-by: Chuanhua Lei <chuanhua.lei@intel.com>
Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18975/
Signed-off-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
arch/mips/lib/memset.S | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/arch/mips/lib/memset.S
+++ b/arch/mips/lib/memset.S
@@ -178,7 +178,7 @@
1: PTR_ADDIU a0, 1 /* fill bytewise */
R10KCBARRIER(0(ra))
bne t1, a0, 1b
- sb a1, -1(a0)
+ EX(sb, a1, -1(a0), .Lsmall_fixup\@)

2: jr ra /* done */
move a2, zero
@@ -212,6 +212,11 @@
jr ra
andi v1, a2, STORMASK

+.Lsmall_fixup\@:
+ PTR_SUBU a2, t1, a0
+ jr ra
+ PTR_ADDIU a2, 1
+
.endm

/*