diff options
| author | Wang Kefeng <wangkefeng.wang@huawei.com> | 2021-09-22 14:56:32 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2021-10-19 10:35:43 +0100 |
| commit | abc25bbcb55c08183d30ee79a308aeef16b62dcb (patch) | |
| tree | 61d448d752712f24bfde938cc0caa377efacc970 /arch/arm/mm/fault.h | |
| parent | 2e707106fac7f81f780d7c76770a726c46757a84 (diff) | |
ARM: 9131/1: mm: Fix PXN process with LPAE feature
When user code execution with privilege mode, it will lead to
infinite loop in the page fault handler if ARM_LPAE enabled,
The issue could be reproduced with
"echo EXEC_USERSPACE > /sys/kernel/debug/provoke-crash/DIRECT"
As Permission fault shows in ARM spec,
IFSR format when using the Short-descriptor translation table format
Permission fault: 01101 First level 01111 Second level
IFSR format when using the Long-descriptor translation table format
Permission fault: 0011LL LL bits indicate levelb.
Add is_permission_fault() function to check permission fault and die
if permission fault occurred under instruction fault in do_page_fault().
Fixes: 1d4d37159d01 ("ARM: 8235/1: Support for the PXN CPU feature on ARMv7")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/mm/fault.h')
| -rw-r--r-- | arch/arm/mm/fault.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/mm/fault.h b/arch/arm/mm/fault.h index 9ecc2097a87a..83b5ab32d7a4 100644 --- a/arch/arm/mm/fault.h +++ b/arch/arm/mm/fault.h @@ -14,6 +14,8 @@ #ifdef CONFIG_ARM_LPAE #define FSR_FS_AEA 17 +#define FS_PERM_NOLL 0xC +#define FS_PERM_NOLL_MASK 0x3C static inline int fsr_fs(unsigned int fsr) { @@ -21,6 +23,8 @@ static inline int fsr_fs(unsigned int fsr) } #else #define FSR_FS_AEA 22 +#define FS_L1_PERM 0xD +#define FS_L2_PERM 0xF static inline int fsr_fs(unsigned int fsr) { |