From: Andrey Konovalov <andreyknvl@google.com>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Christoph Lameter <cl@linux.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mark Rutland <mark.rutland@arm.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Dave Martin <dave.martin@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Ingo Molnar <mingo@kernel.org>,
Paul Lawrence <paullawrence@google.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Arnd Bergmann <arnd@arndb.de>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kate Stewart <kstewart@linuxfoundation.org>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
kasan-dev@googlegroups.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-sparse@vger.kernel.org, linux-mm@kvack.org,
linux-kbuild@vger.kernel.org
Cc: Kostya Serebryany <kcc@google.com>,
Evgeniy Stepanov <eugenis@google.com>,
Lee Smith <Lee.Smith@arm.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Jann Horn <jannh@google.com>, Mark Brand <markbrand@google.com>,
Chintan Pandya <cpandya@codeaurora.org>,
Vishwath Mohan <vishwath@google.com>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v9 12/20] kasan, arm64: enable top byte ignore for the kernel
Date: Fri, 21 Sep 2018 17:13:34 +0200 [thread overview]
Message-ID: <7edbd2d0b0c6f0b7a2b33e3d6da2f14b4b63b8ff.1537542735.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1537542735.git.andreyknvl@google.com>
Tag-based KASAN uses the Top Byte Ignore feature of arm64 CPUs to store a
pointer tag in the top byte of each pointer. This commit enables the
TCR_TBI1 bit, which enables Top Byte Ignore for the kernel, when tag-based
KASAN is used.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
arch/arm64/include/asm/pgtable-hwdef.h | 1 +
arch/arm64/mm/proc.S | 8 +++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
index fd208eac9f2a..483aceedad76 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -289,6 +289,7 @@
#define TCR_A1 (UL(1) << 22)
#define TCR_ASID16 (UL(1) << 36)
#define TCR_TBI0 (UL(1) << 37)
+#define TCR_TBI1 (UL(1) << 38)
#define TCR_HA (UL(1) << 39)
#define TCR_HD (UL(1) << 40)
#define TCR_NFD1 (UL(1) << 54)
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 03646e6a2ef4..b2b44dbdb063 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -47,6 +47,12 @@
/* PTWs cacheable, inner/outer WBWA */
#define TCR_CACHE_FLAGS TCR_IRGN_WBWA | TCR_ORGN_WBWA
+#ifdef CONFIG_KASAN_SW_TAGS
+#define TCR_KASAN_FLAGS TCR_TBI1
+#else
+#define TCR_KASAN_FLAGS 0
+#endif
+
#define MAIR(attr, mt) ((attr) << ((mt) * 8))
/*
@@ -440,7 +446,7 @@ ENTRY(__cpu_setup)
*/
ldr x10, =TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \
TCR_TG_FLAGS | TCR_KASLR_FLAGS | TCR_ASID16 | \
- TCR_TBI0 | TCR_A1
+ TCR_TBI0 | TCR_A1 | TCR_KASAN_FLAGS
tcr_set_idmap_t0sz x10, x9
/*
--
2.19.0.444.g18242da7ef-goog
next prev parent reply other threads:[~2018-09-21 15:14 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 15:13 [PATCH v9 00/20] kasan: add software tag-based mode for arm64 Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 01/20] kasan, mm: change hooks signatures Andrey Konovalov
2018-10-31 16:33 ` Andrey Ryabinin
2018-09-21 15:13 ` [PATCH v9 02/20] kasan: move common generic and tag-based code to common.c Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 03/20] kasan: rename source files to reflect the new naming scheme Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 04/20] kasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_SW_TAGS Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 05/20] kasan, arm64: adjust shadow size for tag-based mode Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 06/20] kasan: initialize shadow to 0xff " Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 07/20] kasan, arm64: untag address in __kimg_to_phys and _virt_addr_is_linear Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 08/20] kasan: add tag related helper functions Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 09/20] kasan: preassign tags to objects with ctors or SLAB_TYPESAFE_BY_RCU Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 10/20] mm: move obj_to_index to include/linux/slab_def.h Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 11/20] kasan, arm64: fix up fault handling logic Andrey Konovalov
2018-09-21 15:13 ` Andrey Konovalov [this message]
2018-09-21 15:13 ` [PATCH v9 13/20] kasan, mm: perform untagged pointers comparison in krealloc Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 14/20] kasan: split out generic_report.c from report.c Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 15/20] kasan: add bug reporting routines for tag-based mode Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 16/20] kasan: add hooks implementation " Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 17/20] kasan, arm64: add brk handler for inline instrumentation Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 18/20] kasan, mm, arm64: tag non slab memory allocated via pagealloc Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 19/20] kasan: update documentation Andrey Konovalov
2018-10-02 13:42 ` Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 20/20] kasan: add SPDX-License-Identifier mark to source files Andrey Konovalov
2018-09-24 15:14 ` [PATCH v9 00/20] kasan: add software tag-based mode for arm64 Dmitry Vyukov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=7edbd2d0b0c6f0b7a2b33e3d6da2f14b4b63b8ff.1537542735.git.andreyknvl@google.com \
--to=andreyknvl@google.com \
--cc=Jacob.Bramley@arm.com \
--cc=Lee.Smith@arm.com \
--cc=Ramana.Radhakrishnan@arm.com \
--cc=Ruben.Ayrapetyan@arm.com \
--cc=akpm@linux-foundation.org \
--cc=ard.biesheuvel@linaro.org \
--cc=arnd@arndb.de \
--cc=aryabinin@virtuozzo.com \
--cc=catalin.marinas@arm.com \
--cc=cl@linux.com \
--cc=cpandya@codeaurora.org \
--cc=dave.martin@arm.com \
--cc=dvyukov@google.com \
--cc=ebiederm@xmission.com \
--cc=eugenis@google.com \
--cc=geert@linux-m68k.org \
--cc=glider@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=jannh@google.com \
--cc=kasan-dev@googlegroups.com \
--cc=kcc@google.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=kstewart@linuxfoundation.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kbuild@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-sparse@vger.kernel.org \
--cc=marc.zyngier@arm.com \
--cc=mark.rutland@arm.com \
--cc=markbrand@google.com \
--cc=mingo@kernel.org \
--cc=ndesaulniers@google.com \
--cc=paullawrence@google.com \
--cc=rppt@linux.vnet.ibm.com \
--cc=vishwath@google.com \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).