Ard Biesheuvel b9bc36704c ARM, xtensa: highmem: avoid clobbering non-page aligned memory reservations ... free_highpages() iterates over the free memblock regions in high memory, and marks each page as available for the memory management system. Until commit cddb5ddf2b ("arm, xtensa: simplify initialization of high memory pages") it rounded beginning of each region upwards and end of each region downwards. However, after that commit free_highmem() rounds the beginning and end of each region downwards, and we may end up freeing a page that is memblock_reserve()d, resulting in memory corruption. Restore the original rounding of the region boundaries to avoid freeing reserved pages. Fixes: cddb5ddf2b ("arm, xtensa: simplify initialization of high memory pages") Link: https://lore.kernel.org/r/20201029110334.4118-1-ardb@kernel.org/ Link: https://lore.kernel.org/r/20201031094345.6984-1-rppt@kernel.org Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Co-developed-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Max Filippov <jcmvbkbc@gmail.com>		2020-11-04 10:42:57 +02:00
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cache.c	mm: remove unneeded includes of <asm/pgalloc.h>	2020-08-07 11:33:26 -07:00
fault.c	mm/xtensa: use general page fault accounting	2020-08-12 10:58:04 -07:00
highmem.c	mm: pgtable: add shortcuts for accessing kernel PMD and PTE	2020-06-09 09:39:13 -07:00
init.c	ARM, xtensa: highmem: avoid clobbering non-page aligned memory reservations	2020-11-04 10:42:57 +02:00
ioremap.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
kasan_init.c	mm: pgtable: add shortcuts for accessing kernel PMD and PTE	2020-06-09 09:39:13 -07:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
misc.S	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
mmu.c	mm: pgtable: add shortcuts for accessing kernel PMD and PTE	2020-06-09 09:39:13 -07:00
tlb.c	xtensa: fix TLB sanity checker	2019-11-26 11:33:39 -08:00