Message ID | 20240830040101.822209-11-Liam.Howlett@oracle.com (mailing list archive) |
---|---|
State | New |
Headers | show
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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. 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Avoid MAP_FIXED gap exposure
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expand
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diff --git a/mm/mmap.c b/mm/mmap.c index 84cb4b1df4a2..ac348ae933ba 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1393,11 +1393,11 @@ unsigned long mmap_region(struct file *file, unsigned long addr, /* Find the first overlapping VMA */ vma = vma_find(&vmi, end); + init_vma_munmap(&vms, &vmi, vma, addr, end, uf, /* unlock = */ false); if (vma) { mt_init_flags(&mt_detach, vmi.mas.tree->ma_flags & MT_FLAGS_LOCK_MASK); mt_on_stack(mt_detach); mas_init(&mas_detach, &mt_detach, /* addr = */ 0); - init_vma_munmap(&vms, &vmi, vma, addr, end, uf, /* unlock = */ false); /* Prepare to unmap any existing mapping in the area */ error = vms_gather_munmap_vmas(&vms, &mas_detach); if (error) diff --git a/mm/vma.h b/mm/vma.h index e78b24d1cf83..0e214bbf443e 100644 --- a/mm/vma.h +++ b/mm/vma.h @@ -95,9 +95,14 @@ static inline void init_vma_munmap(struct vma_munmap_struct *vms, { vms->vmi = vmi; vms->vma = vma; - vms->mm = vma->vm_mm; - vms->start = start; - vms->end = end; + if (vma) { + vms->mm = vma->vm_mm; + vms->start = start; + vms->end = end; + } else { + vms->mm = NULL; + vms->start = vms->end = 0; + } vms->unlock = unlock; vms->uf = uf; vms->vma_count = 0;