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Jia Zhang 595dd46ebf vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page 
Commit:

  df04abfd18 ("fs/proc/kcore.c: Add bounce buffer for ktext data")

... introduced a bounce buffer to work around CONFIG_HARDENED_USERCOPY=y.
However, accessing the vsyscall user page will cause an SMAP fault.

Replace memcpy() with copy_from_user() to fix this bug works, but adding
a common way to handle this sort of user page may be useful for future.

Currently, only vsyscall page requires KCORE_USER.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: jolsa@redhat.com
Link: http://lkml.kernel.org/r/1518446694-21124-2-git-send-email-zhang.jia@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
 		2018-02-13 09:15:58 +01:00
Documentation Merge branch 'idr-2018-02-06' of git://git.infradead.org/users/willy/linux-dax 2018-02-08 14:39:29 -08:00
LICENSES LICENSES: Add MPL-1.1 license 2018-01-06 10:59:44 -07:00
arch vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page 2018-02-13 09:15:58 +01:00
block for-linus-20180204 2018-02-04 11:16:35 -08:00
certs License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-01-31 14:22:45 -08:00
drivers IOMMU Updates for Linux v4.16 2018-02-08 12:03:54 -08:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page 2018-02-13 09:15:58 +01:00
include vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page 2018-02-13 09:15:58 +01:00
init membarrier: Provide core serializing command, *_SYNC_CORE 2018-02-05 21:35:03 +01:00
ipc ipc/mqueue.c: have RT tasks queue in by priority in wq_add() 2018-02-06 18:32:46 -08:00
kernel Modules updates for v4.16 2018-02-07 14:29:34 -08:00
lib Merge branch 'idr-2018-02-06' of git://git.infradead.org/users/willy/linux-dax 2018-02-08 14:39:29 -08:00
mm Merge branch 'akpm' (patches from Andrew) 2018-02-06 22:15:42 -08:00
net This request is late, apologies. 2018-02-08 15:18:32 -08:00
samples sample/bpf: fix erspan metadata 2018-02-06 11:32:49 -05:00
scripts - update includes for gcc 8 (Valdis Kletnieks) 2018-02-08 14:37:32 -08:00
security iversion.h related cleanup for v4.16 2018-02-07 14:25:22 -08:00
sound ASoC: Updates for v4.16 2018-02-07 12:11:09 -08:00
tools Merge branch 'idr-2018-02-06' of git://git.infradead.org/users/willy/linux-dax 2018-02-08 14:39:29 -08:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt 2nd set of arm64 updates for 4.16: 2018-02-08 10:44:25 -08:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
…
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore scripts/package: snap-pkg target 2017-12-13 00:00:18 +09:00
.mailmap mailmap: update Mark Yao's email address 2018-01-04 16:45:09 -08:00
COPYING
…
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS Mostly cleanups, but three bug fixes: 2018-02-08 12:20:41 -08:00
Makefile Makefile: introduce CONFIG_CC_STACKPROTECTOR_AUTO 2018-02-06 18:32:44 -08:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.