This is a note to let you know that I've just added the patch titled
x86/mm: Fix pti_clone_pgtable() alignment assumption
to the 5.4-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_pgtable-alignment-assumption.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c45e8f43bfa20bd6371f0a1aa60b5782da859b13
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Wed Jul 31 18:31:05 2024 +0200
x86/mm: Fix pti_clone_pgtable() alignment assumption
[ Upstream commit 41e71dbb0e0a0fe214545fe64af031303a08524c ]
Guenter reported dodgy crashes on an i386-nosmp build using GCC-11
that had the form of endless traps until entry stack exhaust and then
#DF from the stack guard.
It turned out that pti_clone_pgtable() had alignment assumptions on
the start address, notably it hard assumes start is PMD aligned. This
is true on x86_64, but very much not true on i386.
These assumptions can cause the end condition to malfunction, leading
to a 'short' clone. Guess what happens when the user mapping has a
short copy of the entry text?
Use the correct increment form for addr to avoid alignment
assumptions.
Fixes: 16a3fe634f6a ("x86/mm/pti: Clone kernel-image on PTE level for 32 bit")
Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20240731163105.GG33588@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 7f2140414440d..29eaf3cd9bbdb 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -375,14 +375,14 @@ pti_clone_pgtable(unsigned long start, unsigned long end,
*/
*target_pmd = *pmd;
- addr += PMD_SIZE;
+ addr = round_up(addr + 1, PMD_SIZE);
} else if (level == PTI_CLONE_PTE) {
/* Walk the page-table down to the pte level */
pte = pte_offset_kernel(pmd, addr);
if (pte_none(*pte)) {
- addr += PAGE_SIZE;
+ addr = round_up(addr + 1, PAGE_SIZE);
continue;
}
@@ -402,7 +402,7 @@ pti_clone_pgtable(unsigned long start, unsigned long end,
/* Clone the PTE */
*target_pte = *pte;
- addr += PAGE_SIZE;
+ addr = round_up(addr + 1, PAGE_SIZE);
} else {
BUG();
