linux-kernel - [PATCH 22/41] mm/mremap: write-lock VMA while remapping it to a new address range

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Message-ID: <20230109205336.3665937-23-surenb@google.com>
Date:   Mon,  9 Jan 2023 12:53:17 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     akpm@...ux-foundation.org
Cc:     michel@...pinasse.org, jglisse@...gle.com, mhocko@...e.com,
        vbabka@...e.cz, hannes@...xchg.org, mgorman@...hsingularity.net,
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        peterz@...radead.org, ldufour@...ux.ibm.com,
        laurent.dufour@...ibm.com, paulmck@...nel.org, luto@...nel.org,
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        surenb@...gle.com
Subject: [PATCH 22/41] mm/mremap: write-lock VMA while remapping it to a new
 address range

Write-lock VMA as locked before copying it and when copy_vma produces
a new VMA.

Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
Reviewed-by: Laurent Dufour <laurent.dufour@...ibm.com>
---
 mm/mmap.c   | 1 +
 mm/mremap.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/mm/mmap.c b/mm/mmap.c
index ff02cb51e7e7..da1908730828 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3261,6 +3261,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
 			get_file(new_vma->vm_file);
 		if (new_vma->vm_ops && new_vma->vm_ops->open)
 			new_vma->vm_ops->open(new_vma);
+		vma_write_lock(new_vma);
 		if (vma_link(mm, new_vma))
 			goto out_vma_link;
 		*need_rmap_locks = false;
diff --git a/mm/mremap.c b/mm/mremap.c
index 2ccdd1561f5b..d24a79bcb1a1 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -622,6 +622,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
 			return -ENOMEM;
 	}
 
+	vma_write_lock(vma);
 	new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT);
 	new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff,
 			   &need_rmap_locks);
-- 
2.39.0