linux-kernel - [PATCH v2 1/3] mm: add functions folio_in_range() and folio_within

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230809061105.3369958-2-fengwei.yin@intel.com>
Date:   Wed,  9 Aug 2023 14:11:03 +0800
From:   Yin Fengwei <fengwei.yin@...el.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, yuzhao@...gle.com, willy@...radead.org,
        hughd@...gle.com, yosryahmed@...gle.com, ryan.roberts@....com,
        david@...hat.com, shy828301@...il.com
Cc:     fengwei.yin@...el.com
Subject: [PATCH v2 1/3] mm: add functions folio_in_range() and folio_within_vma()

It will be used to check whether the folio is mapped to specific
VMA and whether the mapping address of folio is in the range.

Also a helper function folio_within_vma() to check whether folio
is in the range of vma based on folio_in_range().

Signed-off-by: Yin Fengwei <fengwei.yin@...el.com>
---
 mm/internal.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/mm/internal.h b/mm/internal.h
index 154da4f0d557..5d1b71010fd2 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -585,6 +585,41 @@ extern long faultin_vma_page_range(struct vm_area_struct *vma,
 				   bool write, int *locked);
 extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags,
 			       unsigned long bytes);
+
+static inline bool
+folio_in_range(struct folio *folio, struct vm_area_struct *vma,
+		unsigned long start, unsigned long end)
+{
+	pgoff_t pgoff, addr;
+	unsigned long vma_pglen = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+
+	VM_WARN_ON_FOLIO(folio_test_ksm(folio), folio);
+	if (start > end)
+		return false;
+
+	if (start < vma->vm_start)
+		start = vma->vm_start;
+
+	if (end > vma->vm_end)
+		end = vma->vm_end;
+
+	pgoff = folio_pgoff(folio);
+
+	/* if folio start address is not in vma range */
+	if (!in_range(pgoff, vma->vm_pgoff, vma_pglen))
+		return false;
+
+	addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
+
+	return !(addr < start || end - addr < folio_size(folio));
+}
+
+static inline bool
+folio_within_vma(struct folio *folio, struct vm_area_struct *vma)
+{
+	return folio_in_range(folio, vma, vma->vm_start, vma->vm_end);
+}
+
 /*
  * mlock_vma_folio() and munlock_vma_folio():
  * should be called with vma's mmap_lock held for read or write,
-- 
2.39.2