From: "Liam R. Howlett" <Liam.Howlett@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Suren Baghdasaryan <surenb@google.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Matthew Wilcox <willy@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>,
sidhartha.kumar@oracle.com, Bert Karwatzki <spasswolf@web.de>,
Jiri Olsa <olsajiri@gmail.com>, Kees Cook <kees@kernel.org>,
"Paul E . McKenney" <paulmck@kernel.org>,
Jeff Xu <jeffxu@chromium.org>,
"Liam R. Howlett" <Liam.Howlett@Oracle.com>
Subject: [PATCH v8 20/21] mm/vma: Drop incorrect comment from vms_gather_munmap_vmas()
Date: Fri, 30 Aug 2024 00:01:00 -0400 [thread overview]
Message-ID: <20240830040101.822209-21-Liam.Howlett@oracle.com> (raw)
In-Reply-To: <20240830040101.822209-1-Liam.Howlett@oracle.com>
From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
The comment has been outdated since 6b73cff239e52 ("mm: change munmap
splitting order and move_vma()"). The move_vma() was altered to fix the
fragile state of the accounting since then.
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
---
mm/vma.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/mm/vma.c b/mm/vma.c
index 3350fe2088bc..1736bb237b2c 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -755,13 +755,8 @@ int vms_gather_munmap_vmas(struct vma_munmap_struct *vms,
/*
* If we need to split any vma, do it now to save pain later.
- *
- * Note: mremap's move_vma VM_ACCOUNT handling assumes a partially
- * unmapped vm_area_struct will remain in use: so lower split_vma
- * places tmp vma above, and higher split_vma places tmp vma below.
+ * Does it split the first one?
*/
-
- /* Does it split the first one? */
if (vms->start > vms->vma->vm_start) {
/*
--
2.43.0
next prev parent reply other threads:[~2024-08-30 4:02 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-30 4:00 [PATCH v8 00/21] Avoid MAP_FIXED gap exposure Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 01/21] mm/vma: Correctly position vma_iterator in __split_vma() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 02/21] mm/vma: Introduce abort_munmap_vmas() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 03/21] mm/vma: Introduce vmi_complete_munmap_vmas() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 04/21] mm/vma: Extract the gathering of vmas from do_vmi_align_munmap() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 05/21] mm/vma: Introduce vma_munmap_struct for use in munmap operations Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 06/21] mm/vma: Change munmap to use vma_munmap_struct() for accounting and surrounding vmas Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 07/21] mm/vma: Extract validate_mm() from vma_complete() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 08/21] mm/vma: Inline munmap operation in mmap_region() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 09/21] mm/vma: Expand mmap_region() munmap call Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 10/21] mm/vma: Support vma == NULL in init_vma_munmap() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 11/21] mm/mmap: Reposition vma iterator in mmap_region() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 12/21] mm/vma: Track start and end for munmap in vma_munmap_struct Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 13/21] mm: Clean up unmap_region() argument list Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 14/21] mm/mmap: Avoid zeroing vma tree in mmap_region() Liam R. Howlett
2024-10-07 19:05 ` [BUG] page table UAF, " Jann Horn
2024-10-07 20:31 ` Liam R. Howlett
2024-10-07 21:31 ` Jann Horn
2024-10-08 1:50 ` Liam R. Howlett
2024-10-08 17:15 ` Jann Horn
2024-10-08 17:51 ` Suren Baghdasaryan
2024-10-08 18:06 ` Jann Horn
2024-10-11 14:26 ` Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 15/21] mm: Change failure of MAP_FIXED to restoring the gap on failure Liam R. Howlett
2024-09-03 3:07 ` Pengfei Xu
2024-09-03 11:00 ` Lorenzo Stoakes
2024-09-03 12:27 ` Lorenzo Stoakes
2024-09-03 16:03 ` Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 16/21] mm/mmap: Use PHYS_PFN in mmap_region() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 17/21] mm/mmap: Use vms accounted pages " Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 18/21] ipc/shm, mm: Drop do_vma_munmap() Liam R. Howlett
2024-08-30 4:00 ` [PATCH v8 19/21] mm: Move may_expand_vm() check in mmap_region() Liam R. Howlett
2024-08-30 4:01 ` Liam R. Howlett [this message]
2024-08-30 4:01 ` [PATCH v8 21/21] mm/vma.h: Optimise vma_munmap_struct Liam R. Howlett
2024-08-30 16:05 ` [PATCH v8 00/21] Avoid MAP_FIXED gap exposure Jeff Xu
2024-08-30 17:07 ` Liam R. Howlett
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