Kees Cook ea60e54b22 /dev/mem: Add bounce buffer for copy-out ... [ Upstream commit 22ec1a2aea ] As done for /proc/kcore in commit df04abfd18 ("fs/proc/kcore.c: Add bounce buffer for ktext data") this adds a bounce buffer when reading memory via /dev/mem. This is needed to allow kernel text memory to be read out when built with CONFIG_HARDENED_USERCOPY (which refuses to read out kernel text) and without CONFIG_STRICT_DEVMEM (which would have refused to read any RAM contents at all). Since this build configuration isn't common (most systems with CONFIG_HARDENED_USERCOPY also have CONFIG_STRICT_DEVMEM), this also tries to inform Kconfig about the recommended settings. This patch is modified from Brad Spengler/PaX Team's changes to /dev/mem code in the last public patch of grsecurity/PaX based on my understanding of the code. Changes or omissions from the original code are mine and don't reflect the original grsecurity/PaX code. Reported-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Fixes: f5509cc18d ("mm: Hardened usercopy") Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-03-24 11:01:24 +01:00
..
apparmor	apparmor: fix ptrace label match when matching stacked labels	2018-01-17 09:45:27 +01:00
integrity	ima: relax requiring a file signature for new files with zero length	2018-03-19 08:42:56 +01:00
keys	KEYS: reject NULL restriction string when type is specified	2017-12-14 09:52:53 +01:00
loadpin	security: mark LSM hooks as __ro_after_init	2017-03-06 11:00:15 +11:00
selinux	selinux: skip bounded transition processing if the policy isn't loaded	2018-02-25 11:07:49 +01:00
smack	lsm: fix smack_inode_removexattr and xattr_getsecurity memleak	2017-10-04 18:03:15 +11:00
tomoyo	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
yama	doc: ReSTify Yama.txt	2017-05-18 10:33:04 -06:00
Kconfig	/dev/mem: Add bounce buffer for copy-out	2018-03-24 11:01:24 +01:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
commoncap.c	capabilities: fix buffer overread on very short xattr	2018-01-05 15:48:57 +01:00
device_cgroup.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
inode.c	securityfs: add the ability to support symlinks	2017-06-08 12:51:43 -07:00
lsm_audit.c	lsm_audit: update my email address	2017-08-17 15:33:39 -04:00
min_addr.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
security.c	selinux/stable-4.14 PR 20170831	2017-09-12 13:21:00 -07:00