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Russell King a5e090acbf ARM: software-based priviledged-no-access support 
Provide a software-based implementation of the priviledged no access
support found in ARMv8.1.

Userspace pages are mapped using a different domain number from the
kernel and IO mappings.  If we switch the user domain to "no access"
when we enter the kernel, we can prevent the kernel from touching
userspace.

However, the kernel needs to be able to access userspace via the
various user accessor functions.  With the wrapping in the previous
patch, we can temporarily enable access when the kernel needs user
access, and re-disable it afterwards.

This allows us to trap non-intended accesses to userspace, eg, caused
by an inadvertent dereference of the LIST_POISON* values, which, with
appropriate user mappings setup, can be made to succeed.  This in turn
can allow use-after-free bugs to be further exploited than would
otherwise be possible.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-08-26 20:34:24 +01:00
..
ashldi3.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
ashrdi3.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
backtrace.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
bitops.h ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
bswapsdi2.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
call_with_stack.S ARM: replace BSYM() with badr assembly macro 2015-05-08 17:33:50 +01:00
changebit.S ARM: 7171/1: unwind: add unwind directives to bitops assembly macros 2011-11-26 21:58:53 +00:00
clear_user.S ARM: uaccess: provide uaccess_save_and_enable() and uaccess_restore() 2015-08-25 16:14:43 +01:00
clearbit.S ARM: 7171/1: unwind: add unwind directives to bitops assembly macros 2011-11-26 21:58:53 +00:00
copy_from_user.S ARM: uaccess: provide uaccess_save_and_enable() and uaccess_restore() 2015-08-25 16:14:43 +01:00
copy_page.S ARM: 5701/1: ARM: copy_page.S: take into account the size of the cache line 2009-09-15 22:07:02 +01:00
copy_template.S ARM: 8225/1: Add unwinding support for memory copy functions 2014-11-27 16:00:25 +00:00
copy_to_user.S ARM: uaccess: provide uaccess_save_and_enable() and uaccess_restore() 2015-08-25 16:14:43 +01:00
csumipv6.S [ARM] 5227/1: Add the ENDPROC declarations to the .S files 2008-09-01 12:06:34 +01:00
csumpartial.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
csumpartialcopy.S [ARM] 5231/1: Do not save the frame pointer in the csum_partial_copy_* functions 2008-09-01 12:06:35 +01:00
csumpartialcopygeneric.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
csumpartialcopyuser.S ARM: software-based priviledged-no-access support 2015-08-26 20:34:24 +01:00
delay-loop.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
delay.c ARM: ensure delay timer has sufficient accuracy for delays 2015-04-14 22:28:07 +01:00
div64.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
ecard.S ARM: remove unnecessary mach/hardware.h includes 2011-07-12 11:19:27 -05:00
findbit.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
floppydma.S Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
getuser.S ARM: 8137/1: fix get_user BE behavior for target variable with size of 8 bytes 2014-09-12 17:38:59 +01:00
io-acorn.S arch: remove direct definitions of KERN_<LEVEL> uses 2012-07-30 17:25:13 -07:00
io-readsb.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
io-readsl.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
io-readsw-armv3.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
io-readsw-armv4.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
io-writesb.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
io-writesl.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
io-writesw-armv3.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
io-writesw-armv4.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
lib1funcs.S ARM: lib/lib1funcs.S: fix typo s/substractions/subtractions/ 2015-05-26 15:28:34 +02:00
lshrdi3.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
Makefile ARM: 8285/1: remove ARMv3 user access code again 2015-01-16 14:49:08 +00:00
memchr.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
memcpy.S ARM: 8225/1: Add unwinding support for memory copy functions 2014-11-27 16:00:25 +00:00
memmove.S ARM: 8224/1: Add unwinding support for memmove function 2014-11-27 16:00:24 +00:00
memset.S ARM: 8204/1: Add unwinding support for memset function 2014-11-21 15:24:49 +00:00
memzero.S ARM: 8223/1: Add unwinding support for __memzero function 2014-11-27 16:00:23 +00:00
muldi3.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
putuser.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
setbit.S ARM: 7171/1: unwind: add unwind directives to bitops assembly macros 2011-11-26 21:58:53 +00:00
strchr.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
strrchr.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
testchangebit.S ARM: 7171/1: unwind: add unwind directives to bitops assembly macros 2011-11-26 21:58:53 +00:00
testclearbit.S ARM: 7171/1: unwind: add unwind directives to bitops assembly macros 2011-11-26 21:58:53 +00:00
testsetbit.S ARM: 7171/1: unwind: add unwind directives to bitops assembly macros 2011-11-26 21:58:53 +00:00
uaccess_with_memcpy.c ARM: uaccess: provide uaccess_save_and_enable() and uaccess_restore() 2015-08-25 16:14:43 +01:00
ucmpdi2.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
xor-neon.c ARM: 7835/2: fix modular build of xor_blocks() with NEON enabled 2013-09-09 15:24:47 +01:00