From: Matthias Kruk <m@m10k.eu>
Date: Wed, 25 Sep 2019 10:03:51 +0000 (+0900)
Subject: Make sure PAGE_ATTR_USER is set on page tables when we're mapping something with... 
X-Git-Url: https://git.corax.cc/?a=commitdiff_plain;h=fd98c9a86eb8100b19cb81dc9d84df6067d093c9;p=corax

Make sure PAGE_ATTR_USER is set on page tables when we're mapping something with PAGE_ATTR_USER within them (IA-32 legacy paging)
---

diff --git a/kernel/arch/paging.c b/kernel/arch/paging.c
index 7f5a624..222df81 100644
--- a/kernel/arch/paging.c
+++ b/kernel/arch/paging.c
@@ -723,6 +723,11 @@ static int _pg_dir_map_legacy(page_table_t *pd, u32_t paddr, u32_t vaddr,
 
 		pt = (page_table_t*)(pd->pt_entries[pde] & 0xfffff000);
 
+		/* make sure PAGE_ATTR_USER is set on the page table, if necessary */
+		if(flags & PAGE_ATTR_USER) {
+			pd->pt_entries[pde] |= PAGE_ATTR_USER;
+		}
+
 		if(pt->pt_entries[pte] & PAGE_ATTR_PRESENT) {
 			ret_val = -EALREADY;
 			break;