Mirrors/opensbi
7
0
Fork 1
mirror of https://github.com/riscv-software-src/opensbi.git synced 2025-08-25 07:41:42 +01:00
Code Issues Packages Projects Releases Wiki Activity

lib: utils: Disallow non-root domains from adding M-mode regions

Browse Source 
The M-mode regions can only be added to the root domain. The non-root
domains shouldn't be able to add them from FDT.

Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Tested-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Himanshu Chauhan
2023-01-09 05:20:41 +00:00
committed by Anup Patel
parent 20646e0184
commit 3e2f573e70
2 changed files with 19 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
lib/utils/fdt/fdt_domain.c
View File

@@ -239,6 +239,20 @@ static int __fdt_parse_region(void *fdt, int domain_offset,
u32 *region_count = opaque;
struct sbi_domain_memregion *region;
/*
* Non-root domains cannot add a region with only M-mode
* access permissions. M-mode regions can only be part of
* root domain.
*
* SU permission bits can't be all zeroes and M-mode permission
* bits must be all set.
*/
if (!((region_access & SBI_DOMAIN_MEMREGION_SU_ACCESS_MASK)
& SBI_DOMAIN_MEMREGION_SU_RWX)
&& ((region_access & SBI_DOMAIN_MEMREGION_M_ACCESS_MASK)
& SBI_DOMAIN_MEMREGION_M_RWX))
return SBI_EINVAL;
/* Find next region of the domain */
if (FDT_DOMAIN_REGION_MAX_COUNT <= *region_count)
return SBI_EINVAL;