Merge tag 'parisc-for-6.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

962da4d1 · Linus Torvalds <[email protected]> · 2024-09-04 09:11:57 -07:00

Pull parisc architecture fix from Helge Deller:

 - Fix boot issue where boot memory is marked read-only too early

* tag 'parisc-for-6.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Delay write-protection until mark_rodata_ro() call

Commit: 962da4d1be82889af5b9cc0f718e5eccfd93cd2d
Parents: 76c0f27d · 213aa670

Merge commit. Changes below are compared with the first parent: 76c0f27d.

Changes

1 files changed · +11 −5

File	Status	Add	Del	Content
arch/parisc/mm/init.c	modified	+11	−5	View file

arch/parisc/mm/init.c

View file

diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 34d91cb..96970fa 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -459,7 +459,6 @@ void free_initmem(void)
 	unsigned long kernel_end  = (unsigned long)&_end;
 
 	/* Remap kernel text and data, but do not touch init section yet. */
-	kernel_set_to_readonly = true;
 	map_pages(init_end, __pa(init_end), kernel_end - init_end,
 		  PAGE_KERNEL, 0);
 
@@ -493,11 +492,18 @@ void free_initmem(void)
 #ifdef CONFIG_STRICT_KERNEL_RWX
 void mark_rodata_ro(void)
 {
-	/* rodata memory was already mapped with KERNEL_RO access rights by
-           pagetable_init() and map_pages(). No need to do additional stuff here */
-	unsigned long roai_size = __end_ro_after_init - __start_ro_after_init;
+	unsigned long start = (unsigned long) &__start_rodata;
+	unsigned long end = (unsigned long) &__end_rodata;
+
+	pr_info("Write protecting the kernel read-only data: %luk\n",
+	       (end - start) >> 10);
+
+	kernel_set_to_readonly = true;
+	map_pages(start, __pa(start), end - start, PAGE_KERNEL, 0);
 
-	pr_info("Write protected read-only-after-init data: %luk\n", roai_size >> 10);
+	/* force the kernel to see the new page table entries */
+	flush_cache_all();
+	flush_tlb_all();
 }
 #endif
 