add arm list
-----邮件原件-----
发件人: wangliang (C)
发送时间: 2021年7月15日 20:30
收件人: palmerdabbelt@xxxxxxxxxx; mcgrof@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux@xxxxxxxxxxxxxxx
抄送: stable@xxxxxxxxxxxxxxx; wangliang (C) <wangliang101@xxxxxxxxxx>; Wangle (RTOS FAE) <wangle6@xxxxxxxxxx>; Chenxin (RTOS) <kepler.chenxin@xxxxxxxxxx>; Nixiaoming <nixiaoming@xxxxxxxxxx>
主题: [PATCH] arm:mmap: fix physical address overflow when CONFIG_ARM_LPAE=y
When the CONFIG_ARM_LPAE is enabled on arm32, the physical address may exceed 32 bits. In the devmem_is_allowed function, the physical address is obtained through displacement of the physical page number.Without explicit translation, the physical address may overflow and be truncated.
Use the PFN_PHYS macro to fix this bug.
This bug was initially introduced in v2.6.37 with commit:087aaffcdf9c91.
In v5.10, this code has been modified by commit:527701eda5f196.
Fixes: 527701eda5f196 ("lib: Add a generic version of devmem_is_allowed")
Fixes: 087aaffcdf9c91 ("ARM: implement CONFIG_STRICT_DEVMEM by disabling access to RAM via /dev/mem")
Cc: stable@xxxxxxxxxxxxxxx # v2.6.37
Signed-off-by: Liang Wang <wangliang101@xxxxxxxxxx>
---
lib/devmem_is_allowed.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/devmem_is_allowed.c b/lib/devmem_is_allowed.c index c0d67c541849..60be9e24bd57 100644
--- a/lib/devmem_is_allowed.c
+++ b/lib/devmem_is_allowed.c
@@ -19,7 +19,7 @@
*/
int devmem_is_allowed(unsigned long pfn) {
- if (iomem_is_exclusive(pfn << PAGE_SHIFT))
+ if (iomem_is_exclusive(PFN_PHYS(pfn)))
return 0;
if (!page_is_ram(pfn))
return 1;
--
2.32.0
