Eugeniy Paltsev cacbc85376 ARC: mm: SIGSEGV userspace trying to access kernel virtual memory ... [ Upstream commit a8c715b4dd ] As of today if userspace process tries to access a kernel virtual addres (0x7000_0000 to 0x7ffff_ffff) such that a legit kernel mapping already exists, that process hangs instead of being killed with SIGSEGV Fix that by ensuring that do_page_fault() handles kenrel vaddr only if in kernel mode. And given this, we can also simplify the code a bit. Now a vmalloc fault implies kernel mode so its failure (for some reason) can reuse the @no_context label and we can remove @bad_area_nosemaphore. Reproduce user test for original problem: ------------------------>8----------------- #include <stdlib.h> #include <stdint.h> int main(int argc, char *argv[]) { volatile uint32_t temp; temp = *(uint32_t *)(0x70000000); } ------------------------>8----------------- Cc: <stable@vger.kernel.org> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-09-16 08:22:14 +02:00
..
boot	ARC: [plat-hsdk]: Add missing FIFO size entry in GMAC node	2019-06-25 11:35:55 +08:00
configs	ARC: enable uboot support unconditionally	2019-08-06 19:06:57 +02:00
include	ARC: fix build warnings	2019-06-25 11:35:55 +08:00
kernel	ARC: show_regs: lockdep: re-enable preemption	2019-09-16 08:22:02 +02:00
lib	ARCv2: lib: memcpy: fix doing prefetchw outside of buffer	2019-03-23 20:09:51 +01:00
mm	ARC: mm: SIGSEGV userspace trying to access kernel virtual memory	2019-09-16 08:22:14 +02:00
oprofile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
plat-axs10x	ARC: [plat-axs103] refactor the quad core DT quirk code	2017-12-20 12:41:45 -08:00
plat-eznps	arc: [plat-eznps] fix printk warning in arc/plat-eznps/mtm.c	2018-07-30 11:48:49 -07:00
plat-hsdk	ARCv2: support manual regfile save on interrupts	2019-03-23 20:09:51 +01:00
plat-sim	ARC: [plat-sim] Include this platform unconditionally	2017-08-04 13:49:47 +05:30
plat-tb10x	arc: select GPIOLIB directly	2016-04-26 14:07:59 +02:00
Kbuild
Kconfig	ARC: enable uboot support unconditionally	2019-08-06 19:06:57 +02:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Makefile	ARC: change defconfig defaults to ARCv2	2018-12-08 12:59:10 +01:00