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Merge tag 'riscv/for-v5.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

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Pull RISC-V fix from Paul Walmsley:
 "One significant fix for 32-bit RISC-V systems:

  Fix the RV32 memory map to prevent userspace from corrupting the
  FIXMAP area. Without this patch, the system can crash very early
  during the boot"

* tag 'riscv/for-v5.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  RISC-V: Fix FIXMAP area corruption on RV32 systems
This commit is contained in:
Linus Torvalds
2019-08-31 09:02:36 -07:00
parent 834354f642 a256f2e329
commit 7fb86707cc
2 changed files with 10 additions and 6 deletions
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4
arch/riscv/include/asm/fixmap.h
View File

@@ -30,10 +30,6 @@ enum fixed_addresses {
__end_of_fixed_addresses
};
#define FIXADDR_SIZE (__end_of_fixed_addresses * PAGE_SIZE)
#define FIXADDR_TOP (VMALLOC_START)
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
#define FIXMAP_PAGE_IO PAGE_KERNEL
#define __early_set_fixmap __set_fixmap

12
arch/riscv/include/asm/pgtable.h
View File

@@ -420,14 +420,22 @@ static inline void pgtable_cache_init(void)
#define VMALLOC_END (PAGE_OFFSET - 1)
#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
#define FIXADDR_TOP VMALLOC_START
#ifdef CONFIG_64BIT
#define FIXADDR_SIZE PMD_SIZE
#else
#define FIXADDR_SIZE PGDIR_SIZE
#endif
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
/*
* Task size is 0x4000000000 for RV64 or 0xb800000 for RV32.
* Task size is 0x4000000000 for RV64 or 0x9fc00000 for RV32.
* Note that PGDIR_SIZE must evenly divide TASK_SIZE.
*/
#ifdef CONFIG_64BIT
#define TASK_SIZE (PGDIR_SIZE * PTRS_PER_PGD / 2)
#else
#define TASK_SIZE VMALLOC_START
#define TASK_SIZE FIXADDR_START
#endif
#include <asm-generic/pgtable.h>