linux-kernel - [PATCH for v6.3 regression] mm/mremap: fix vm_pgoff in vma

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Date:   Thu, 27 Apr 2023 16:09:59 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Liam R. Howlett" <Liam.Howlett@...cle.com>, lstoakes@...il.com,
        regressions@...ts.linux.dev, linux-mm@...ck.org,
        patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Vlastimil Babka <vbabka@...e.cz>,
        Jiri Slaby <jirislaby@...nel.org>,
        Fabian Vogt <fvogt@...e.com>, stable@...r.kernel.org
Subject: [PATCH for v6.3 regression] mm/mremap: fix vm_pgoff in vma_merge() case 3

After upgrading build guests to v6.3, rpm started segfaulting for
specific packages, which was bisected to commit 0503ea8f5ba7 ("mm/mmap:
remove __vma_adjust()"). rpm is doing many mremap() operations with file
mappings of its db. The problem is that in vma_merge() case 3 (we merge
with the next vma, expanding it downwards) vm_pgoff is not adjusted as
it should when vm_start changes. As a result the rpm process most likely
sees data from the wrong offset of the file. Fix the vm_pgoff
calculation.

For case 8 this is a non-functional change as the resulting vm_pgoff is
the same.

Reported-and-bisected-by: Jiri Slaby <jirislaby@...nel.org>
Reported-and-tested-by: Fabian Vogt <fvogt@...e.com>
Link: https://bugzilla.suse.com/show_bug.cgi?id=1210903
Fixes: 0503ea8f5ba7 ("mm/mmap: remove __vma_adjust()")
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
Cc: <stable@...r.kernel.org>
---
Hi, I'm sending this patch on top of v6.3 as I think it should be
applied and backported to 6.3-stable rather sooner than later.
This means there would be a small conflict when merging mm/mm-stable
later. Alternatively it could be added to mm/mm-stable and upcoming 6.4
pull request, but then the stable backport would need adjustment.
It's up to Linus and Andrew.

#regzbot introduced: 0503ea8f5ba7 https://bugzilla.suse.com/show_bug.cgi?id=1210903

 mm/mmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index d5475fbf5729..eefa6f0cda28 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -978,7 +978,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 			vma = next;			/* case 3 */
 			vma_start = addr;
 			vma_end = next->vm_end;
-			vma_pgoff = mid->vm_pgoff;
+			vma_pgoff = next->vm_pgoff - pglen;
 			err = 0;
 			if (mid != next) {		/* case 8 */
 				remove = mid;
-- 
2.40.0