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riscv: read-only pages should not be writable

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If EFI pages are marked as read-only,
we should remove the _PAGE_WRITE flag.

The current code overwrites an unused value.

Fixes: b91540d52a ("RISC-V: Add EFI runtime services")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Link: https://lore.kernel.org/r/20220528014132.91052-1-heinrich.schuchardt@canonical.com
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Heinrich Schuchardt 2022-05-28 03:41:32 +02:00 committed by Ard Biesheuvel
parent 3f68e69520
commit 630f972d76
1 changed files with 1 additions and 1 deletions
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2
arch/riscv/kernel/efi.c
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@ -65,7 +65,7 @@ static int __init set_permissions(pte_t *ptep, unsigned long addr, void *data)
if (md->attribute & EFI_MEMORY_RO) {
val = pte_val(pte) & ~_PAGE_WRITE;
val = pte_val(pte) | _PAGE_READ;
val |= _PAGE_READ;
pte = __pte(val);
}
if (md->attribute & EFI_MEMORY_XP) {