Will Deacon 15122ee2c5 arm64: Enforce BBM for huge IO/VMAP mappings ...

ioremap_page_range doesn't honour break-before-make and attempts to put
down huge mappings (using p*d_set_huge) over the top of pre-existing
table entries. This leads to us leaking page table memory and also gives
rise to TLB conflicts and spurious aborts, which have been seen in
practice on Cortex-A75.

Until this has been resolved, refuse to put block mappings when the
existing entry is found to be present.

Fixes: 324420bf91f60 ("arm64: add support for ioremap() block mappings")
Reported-by: Hanjun Guo <hanjun.guo@linaro.org>
Reported-by: Lei Li <lious.lilei@hisilicon.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

2018-02-22 11:25:53 +00:00

..

cache.S

arm64: mm: Add additional parameter to uaccess_ttbr0_disable

2018-01-17 13:57:49 +01:00

context.c

arm64: Move BP hardening to check_and_switch_context

2018-01-23 15:40:29 +00:00

copypage.c

arm64: Defer dcache flush in __cpu_copy_user_page

2015-12-17 11:07:13 +00:00

dma-mapping.c

arm64: use swiotlb_alloc and swiotlb_free

2018-01-15 09:36:02 +01:00

dump.c

arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables

2018-02-16 18:13:57 +00:00

extable.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

fault.c

arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables

2018-02-16 18:13:57 +00:00

flush.c

arm64: fix pmem interface definition

2017-08-10 18:13:59 +01:00

hugetlbpage.c

arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables

2018-02-16 18:13:57 +00:00

init.c

dma mapping changes for Linux 4.16:

2018-01-31 11:32:27 -08:00

ioremap.c

arm64: use is_vmalloc_addr

2017-02-09 13:47:56 +00:00

kasan_init.c

arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables

2018-02-16 18:13:57 +00:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

mmap.c

arm64/mmap: properly account for stack randomization in mmap_base

2017-07-12 16:26:03 -07:00

mmu.c

arm64: Enforce BBM for huge IO/VMAP mappings

2018-02-22 11:25:53 +00:00

numa.c

arm64/numa: Drop duplicate message

2017-07-20 17:03:53 +01:00

pageattr.c

arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables

2018-02-16 18:13:57 +00:00

pgd.c

arm64: handle 52-bit addresses in TTBR

2017-12-22 17:35:21 +00:00

physaddr.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

proc.S

arm64: proc: Set PTE_NG for table entries to avoid traversing them twice

2018-02-14 18:58:20 +00:00

ptdump_debugfs.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00