x86/mm: Fix pti_clone_entry_text() for i386

BugLink: https://bugs.launchpad.net/bugs/2083656

[ 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: 16a3fe634f ("x86/mm/pti: Clone kernel-image on PTE level for 32 bit")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>

This commit is contained in:

Peter Zijlstra

2024-08-01 12:42:25 +02:00

committed by

Mehmet Basaran

parent 9d42a0404e

commit 1f77dc9511

1 changed files with 1 additions and 1 deletions

									
										arch/x86/mm/pti.c
									
		+1
		-1
	
												View File
												
				@@ -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);

				}

				/*