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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-08-31 09:02:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-08-31 09:02:36 -0700 |
| commit | 7fb86707cc3a256e5556ced9c3a3eb96122d4b16 (patch) | |
| tree | 77b40d8d850e44a07e3f841ef7c5390c26b92bb0 /arch | |
| parent | 834354f642adfe7bb6d5dba5f7de6ecd3150fb2f (diff) | |
| parent | a256f2e329df0773022d28df2c3d206b9aaf1e61 (diff) | |
| download | lwn-7fb86707cc3a256e5556ced9c3a3eb96122d4b16.tar.gz lwn-7fb86707cc3a256e5556ced9c3a3eb96122d4b16.zip | |
Merge tag 'riscv/for-v5.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/include/asm/fixmap.h | 4 | ||||
| -rw-r--r-- | arch/riscv/include/asm/pgtable.h | 12 |
2 files changed, 10 insertions, 6 deletions
diff --git a/arch/riscv/include/asm/fixmap.h b/arch/riscv/include/asm/fixmap.h index 9c66033c3a54..161f28d04a07 100644 --- a/arch/riscv/include/asm/fixmap.h +++ b/arch/riscv/include/asm/fixmap.h @@ -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 diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index a364aba23d55..c24a083b3e12 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -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> |