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Andrew Gabbasov 16b7cb2803 memory: renesas-rpc-if: Avoid unaligned bus access for HyperFlash 
[ Upstream commit 1869023e24 ]

HyperFlash devices in Renesas SoCs use 2-bytes addressing, according
to HW manual paragraph 62.3.3 (which officially describes Serial Flash
access, but seems to be applicable to HyperFlash too). And 1-byte bus
read operations to 2-bytes unaligned addresses in external address space
read mode work incorrectly (returns the other byte from the same word).

Function memcpy_fromio(), used by the driver to read data from the bus,
in ARM64 architecture (to which Renesas cores belong) uses 8-bytes
bus accesses for appropriate aligned addresses, and 1-bytes accesses
for other addresses. This results in incorrect data read from HyperFlash
in unaligned cases.

This issue can be reproduced using something like the following commands
(where mtd1 is a parition on Hyperflash storage, defined properly
in a device tree):

[Correct fragment, read from Hyperflash]

    root@rcar-gen3:~# dd if=/dev/mtd1 of=/tmp/zz bs=32 count=1
    root@rcar-gen3:~# hexdump -C /tmp/zz
    00000000  f4 03 00 aa f5 03 01 aa  f6 03 02 aa f7 03 03 aa  |................|
    00000010  00 00 80 d2 40 20 18 d5  00 06 81 d2 a0 18 a6 f2  |....@ ..........|
    00000020

[Incorrect read of the same fragment: see the difference at offsets 8-11]

    root@rcar-gen3:~# dd if=/dev/mtd1 of=/tmp/zz bs=12 count=1
    root@rcar-gen3:~# hexdump -C /tmp/zz
    00000000  f4 03 00 aa f5 03 01 aa  03 03 aa aa              |............|
    0000000c

Fix this issue by creating a local replacement of the copying function,
that performs only properly aligned bus accesses, and is used for reading
from HyperFlash.

Fixes: ca7d8b980b ("memory: add Renesas RPC-IF driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Link: https://lore.kernel.org/r/20210922184830.29147-1-andrew_gabbasov@mentor.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-07-12 16:34:52 +02:00
arch xen/arm: Fix race in RB-tree based P2M accounting 2022-07-07 17:53:32 +02:00
block block: Fix handling of offline queues in blk_mq_alloc_request_hctx() 2022-06-22 14:22:02 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: memneq - move into lib/ 2022-06-22 14:22:03 +02:00
Documentation docs: update mapping documentation 2022-07-02 16:41:15 +02:00
drivers memory: renesas-rpc-if: Avoid unaligned bus access for HyperFlash 2022-07-12 16:34:52 +02:00
fs btrfs: fix deadlock between chunk allocation and chunk btree modifications 2022-07-12 16:34:52 +02:00
include drm/fourcc: fix integer type usage in uapi header 2022-07-07 17:53:34 +02:00
init Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug 2022-06-09 10:23:26 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:23:10 +02:00
kernel bpf: Fix insufficient bounds propagation from adjust_scalar_min_max_vals 2022-07-12 16:34:49 +02:00
lib crypto: memneq - move into lib/ 2022-06-22 14:22:03 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/filemap: fix UAF in find_lock_entries 2022-07-12 16:34:47 +02:00
net netfilter: nf_tables: stricter validation of element data 2022-07-12 16:34:50 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:23:23 +02:00
scripts modpost: fix section mismatch check for exported init/exit sections 2022-06-29 09:03:31 +02:00
security fs: support mapped mounts of mapped filesystems 2022-07-02 16:41:17 +02:00
sound ALSA: cs46xx: Fix missing snd_card_free() call at probe error 2022-07-12 16:34:48 +02:00
tools Revert "selftests/bpf: Add test for bpf_timer overwriting crash" 2022-07-12 16:34:47 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: avoid NULL pointer dereference in kvm_dirty_ring_push 2022-04-13 20:59:26 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Input: goodix - add a goodix.h header file 2022-07-12 16:34:51 +02:00
Makefile Linux 5.15.53 2022-07-07 17:53:35 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.