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Aymen Sghaier 9f79bd5b2f crypto: caam - fix zero-length buffer DMA mapping 
commit 04e6d25c5b upstream.

Recent changes - probably DMA API related (generic and/or arm64-specific) -
exposed a case where driver maps a zero-length buffer:
ahash_init()->ahash_update()->ahash_final() with a zero-length string to
hash

kernel BUG at kernel/dma/swiotlb.c:475!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 1823 Comm: cryptomgr_test Not tainted 4.20.0-rc1-00108-g00c9fe37a7f2 #1
Hardware name: LS1046A RDB Board (DT)
pstate: 80000005 (Nzcv daif -PAN -UAO)
pc : swiotlb_tbl_map_single+0x170/0x2b8
lr : swiotlb_map_page+0x134/0x1f8
sp : ffff00000f79b8f0
x29: ffff00000f79b8f0 x28: 0000000000000000
x27: ffff0000093d0000 x26: 0000000000000000
x25: 00000000001f3ffe x24: 0000000000200000
x23: 0000000000000000 x22: 00000009f2c538c0
x21: ffff800970aeb410 x20: 0000000000000001
x19: ffff800970aeb410 x18: 0000000000000007
x17: 000000000000000e x16: 0000000000000001
x15: 0000000000000019 x14: c32cb8218a167fe8
x13: ffffffff00000000 x12: ffff80097fdae348
x11: 0000800976bca000 x10: 0000000000000010
x9 : 0000000000000000 x8 : ffff0000091fd6c8
x7 : 0000000000000000 x6 : 00000009f2c538bf
x5 : 0000000000000000 x4 : 0000000000000001
x3 : 0000000000000000 x2 : 00000009f2c538c0
x1 : 00000000f9fff000 x0 : 0000000000000000
Process cryptomgr_test (pid: 1823, stack limit = 0x(____ptrval____))
Call trace:
 swiotlb_tbl_map_single+0x170/0x2b8
 swiotlb_map_page+0x134/0x1f8
 ahash_final_no_ctx+0xc4/0x6cc
 ahash_final+0x10/0x18
 crypto_ahash_op+0x30/0x84
 crypto_ahash_final+0x14/0x1c
 __test_hash+0x574/0xe0c
 test_hash+0x28/0x80
 __alg_test_hash+0x84/0xd0
 alg_test_hash+0x78/0x144
 alg_test.part.30+0x12c/0x2b4
 alg_test+0x3c/0x68
 cryptomgr_test+0x44/0x4c
 kthread+0xfc/0x128
 ret_from_fork+0x10/0x18
Code: d34bfc18 2a1a03f7 1a9f8694 35fff89a (d4210000)

Cc: <stable@vger.kernel.org>
Signed-off-by: Aymen Sghaier <aymen.sghaier@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2019-01-22 21:09:50 +01:00
arch arm64: Don't trap host pointer auth use to EL2 2019-01-22 21:09:47 +01:00
block block: mq-deadline: Fix write completion handling 2019-01-13 09:24:05 +01:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto crypto: sm3 - fix undefined shift by >= width of value 2019-01-22 21:09:50 +01:00
Documentation x86/speculation/l1tf: Drop the swap storage limit restriction when l1tf=off 2019-01-09 17:45:54 +01:00
drivers crypto: caam - fix zero-length buffer DMA mapping 2019-01-22 21:09:50 +01:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs Btrfs: use nofs context when initializing security xattrs to avoid deadlock 2019-01-16 22:03:27 +01:00
include IN_BADCLASS: fix macro to actually work 2019-01-22 21:09:49 +01:00
init psi: fix reference to kernel commandline enable 2018-12-14 15:05:45 -08:00
ipc ipc: IPCMNI limit check for semmni 2018-10-31 08:54:14 -07:00
kernel fork, memcg: fix cached_stacks case 2019-01-16 22:03:23 +01:00
lib lib: fix build failure in CONFIG_DEBUG_VIRTUAL test 2019-01-13 09:24:09 +01:00
LICENSES This is a fairly typical cycle for documentation. There's some welcome 2018-10-24 18:01:11 +01:00
mm mm: page_mapped: don't assume compound page is huge or THP 2019-01-16 22:03:26 +01:00
net smc: move unhash as early as possible in smc_release() 2019-01-22 21:09:50 +01:00
samples VFIO updates for v4.20 2018-10-31 11:01:38 -07:00
scripts x86, modpost: Replace last remnants of RETPOLINE with CONFIG_RETPOLINE 2019-01-16 22:03:21 +01:00
security selinux: policydb - fix byte order and alignment issues 2019-01-13 09:24:06 +01:00
sound ALSA: hda/realtek - Disable headset Mic VREF for headset mode of ALC225 2019-01-16 22:03:21 +01:00
tools selftests: Fix test errors related to lib.mk khdr target 2019-01-13 09:24:09 +01:00
usr initramfs: move gen_initramfs_list.sh from scripts/ to usr/ 2018-08-22 23:21:44 +09:00
virt KVM: arm/arm64: vgic: Fix off-by-one bug in vgic_get_irq() 2019-01-09 17:46:04 +01:00
.clang-format page cache: Convert find_get_pages_contig to XArray 2018-10-21 10:46:34 -04:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Add hch to .get_maintainer.ignore 2015-08-21 14:30:10 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap mailmap: Update email for Punit Agrawal 2018-11-05 10:02:11 +00:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS: update entry for MMP platform 2018-12-03 12:39:57 -08:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-12-21 14:21:17 -08:00
Makefile Linux 4.20.3 2019-01-16 22:03:27 +01:00
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.