pve-kernel-qoup/patches/kernel/0019-mm-mremap-fix-mremap-expanding-vma-with-addr-inside-.patch
Thomas Lamprecht 4d1db3083c backport some fixes-fixes from v6.1.4
found with

 git log --decorate v5.16^..v6.1.4 -- Makefile kernel/ secuirty drivers/ fs \
   block mm net virt/ ipc init arch/x86/ | ~/gitdm/stablefixes \
   --fixed-after v6.1.2 --regressed-before v6.1.2

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
2023-01-07 14:52:24 +01:00

60 lines
2.5 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Vlastimil Babka <vbabka@suse.cz>
Date: Fri, 16 Dec 2022 17:32:27 +0100
Subject: [PATCH] mm, mremap: fix mremap() expanding vma with addr inside vma
MIME-Version: 1.0
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commit 6f12be792fde994ed934168f93c2a0d2a0cf0bc5 upstream.
Since 6.1 we have noticed random rpm install failures that were tracked to
mremap() returning -ENOMEM and to commit ca3d76b0aa80 ("mm: add merging
after mremap resize").
The problem occurs when mremap() expands a VMA in place, but using an
starting address that's not vma->vm_start, but somewhere in the middle.
The extension_pgoff calculation introduced by the commit is wrong in that
case, so vma_merge() fails due to pgoffs not being compatible. Fix the
calculation.
By the way it seems that the situations, where rpm now expands a vma from
the middle, were made possible also due to that commit, thanks to the
improved vma merging. Yet it should work just fine, except for the buggy
calculation.
Link: https://lkml.kernel.org/r/20221216163227.24648-1-vbabka@suse.cz
Reported-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://bugzilla.suse.com/show_bug.cgi?id=1206359
Fixes: ca3d76b0aa80 ("mm: add merging after mremap resize")
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jakub Matěna <matenajakub@gmail.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 4d528dab403ba45db24769f5e5a9514ab0890351)
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---
mm/mremap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/mremap.c b/mm/mremap.c
index e465ffe279bb..fe587c5d6591 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -1016,7 +1016,8 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
long pages = (new_len - old_len) >> PAGE_SHIFT;
unsigned long extension_start = addr + old_len;
unsigned long extension_end = addr + new_len;
- pgoff_t extension_pgoff = vma->vm_pgoff + (old_len >> PAGE_SHIFT);
+ pgoff_t extension_pgoff = vma->vm_pgoff +
+ ((extension_start - vma->vm_start) >> PAGE_SHIFT);
if (vma->vm_flags & VM_ACCOUNT) {
if (security_vm_enough_memory_mm(mm, pages)) {