This is a note to let you know that I've just added the patch titled
x86/mm: Fix pti_clone_entry_text() for i386
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-mm-fix-pti_clone_entry_text-for-i386.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 985f7675ebf097630e875a6f9965936efd520a10
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu Aug 1 12:42:25 2024 +0200
x86/mm: Fix pti_clone_entry_text() for i386
[ Upstream commit 3db03fb4995ef85fc41e86262ead7b4852f4bcf0 ]
While x86_64 has PMD aligned text sections, i386 does not have this
luxery. Notably ALIGN_ENTRY_TEXT_END is empty and _etext has PAGE
alignment.
This means that text on i386 can be page granular at the tail end,
which in turn means that the PTI text clones should consistently
account for this.
Make pti_clone_entry_text() consistent with pti_clone_kernel_text().
Fixes: 16a3fe634f6a ("x86/mm/pti: Clone kernel-image on PTE level for 32 bit")
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index c11c808eeac26..189b242d3e897 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -496,7 +496,7 @@ static void pti_clone_entry_text(void)
{
pti_clone_pgtable((unsigned long) __entry_text_start,
(unsigned long) __entry_text_end,
- PTI_CLONE_PMD);
+ PTI_LEVEL_KERNEL_IMAGE);
}
/*
